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MAX8648ETE+T

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MAX8648ETE+T

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Part Number MAX8648ETE+T
Manufacturer Maxim Integrated
Description IC LED DRIVER RGLTR DIM 16TQFN
Datasheet MAX8648ETE+T Datasheet
Package 16-WFQFN Exposed Pad
In Stock 7,644 piece(s)
Unit Price $ 2.0441 *
Lead Time Can Ship Immediately
Estimated Delivery Time Dec 4 - Dec 9 (Choose Expedited Shipping)
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Part Number # MAX8648ETE+T (PMIC - LED Drivers) is manufactured by Maxim Integrated and distributed by Heisener. Being one of the leading electronics distributors, we carry many kinds of electronic components from some of the world’s top class manufacturers. Their quality is guaranteed by its stringent quality control to meet all required standards.

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MAX8648ETE+T Specifications

ManufacturerMaxim Integrated
CategoryIntegrated Circuits (ICs) - PMIC - LED Drivers
Datasheet MAX8648ETE+TDatasheet
Package16-WFQFN Exposed Pad
Series-
TypeDC DC Regulator
TopologySwitched Capacitor (Charge Pump)
Internal Switch(s)Yes
Number of Outputs6
Voltage - Supply (Min)2.7V
Voltage - Supply (Max)5.5V
Voltage - Output5V
Current - Output / Channel24mA
Frequency1MHz
DimmingMulti-Step
ApplicationsBacklight, Camera Flash
Operating Temperature-40°C ~ 85°C (TA)
Mounting TypeSurface Mount
Package / Case16-WFQFN Exposed Pad
Supplier Device Package16-TQFN (3x3)

MAX8648ETE+T Datasheet

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General Description The MAX8647/MAX8648 drive up to six white LEDs or two sets of RGB LEDs with regulated constant current for display backlight and fun light applications. By utiliz- ing an inverting charge pump and extremely low- dropout adaptive current regulators, these ICs achieve very high efficiency over the full 1-cell Li+ battery volt- age range and even with large LED forward voltage mismatch. The 1MHz fixed-frequency switching allows for tiny external components. The regulation scheme is optimized to ensure low EMI and low input ripple. The MAX8647/MAX8648 include thermal shutdown, open- and short-circuit protection. The MAX8647 features an I2C serial port, while the MAX8648 features a three-wire serial-pulse logic inter- face. Both devices support independent on/off and dimming for main and subbacklights. The dimming ranges are pseudo-logarithmic from 24mA to 0.1mA and off in 32 steps. Both devices include a temperature derating function to safely allow bright 24mA full-scale output current setting while automatically reducing cur- rent to protect LEDs at high ambient temperatures above +60°C. The MAX8647/MAX8648 are available in a 16-pin, 3mm x 3mm thin QFN package (0.8mm max height). Applications White LED Backlighting, Single or Dual Display Wide-Gamut RGB LED Display Backlighting Camera Flash or RGB Indicators Cellular Phones and Smartphones PDAs, Digital Cameras, and Camcorders Features ♦ Six Adaptive Current Regulators ♦ Independent Voltage Supply for Each LED ♦ Individual LED Brightness Control (MAX8647) ♦ 24mA to 0.1mA Dimming Range I2C Interface (MAX8647) Serial-Pulse Dimming Logic (MAX8648) ♦ ±2% Accuracy, ±0.4% Matching (typ) ♦ Low 70µA Quiescent Current ♦ Low 1µA Shutdown Current ♦ Inrush Current Limit ♦ TA Derating Function Protects LEDs ♦ 16-Pin, 3mm x 3mm Thin QFN Package M A X 8 6 4 7 /M A X 8 6 4 8 Ultra-Efficient Charge Pumps for Six White/RGB LEDs in 3mm x 3mm Thin QFN ________________________________________________________________ Maxim Integrated Products 1 15 16 14 13 5 6 7 C 1P C 2P 8 IN LE D 4 LE D 5 LE D 2 1 3 SDA (ENC) ( ) DESIGNATE PINS ON THE MAX8648 4 12 10 9 SCL (ENB) VDD (ENA) LED6 NEG C1N C2N MAX8647ETE MAX8648ETE G N D LE D 3 2 11 LED1 THIN QFN TOP VIEW + Pin Configuration 19-0790; Rev 1; 9/07 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. EVALU ATION KIT AVAIL ABLE Ordering Information Note: All devices are specified over the -40°C to +85°C extended temperature range. +Denotes a lead-free package. *EP = Exposed paddle. PART DIMMING PIN PACKAGE TOP MARK PKG CODE M A X8 6 4 7 E TE + I2C interface 16 Thi n QFN- E P * AFD T1633- 5 M A X8 6 4 8 E TE + S eri al -p ul se l ogi c 16 Thi n QFN- E P * AFE T1633- 5 WHITE OR RGB LED EP LED3 1μF IN GND LED4 LED5 LED6 D6 LED2 MAX8648 D4 D5 D3 D2 D1 LED1 NEG INPUT 2.7V TO 5.5V 1μF C1P C1N 1μF C2P C2N 1μF SERIAL- PULSE INTERFACE ENA ENB ENC Typical Operating Circuit

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M A X 8 6 4 7 /M A X 8 6 4 8 Ultra-Efficient Charge Pumps for Six White/RGB LEDs in 3mm x 3mm Thin QFN 2 _______________________________________________________________________________________ ABSOLUTE MAXIMUM RATINGS ELECTRICAL CHARACTERISTICS (VVDD = VIN = 3.6V, VGND = 0V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. VDD, IN, SCL, SDA, ENA, ENB, ENC to GND........-0.3V to +6.0V VDD, IN, SCL, SDA, ENA, ENB, ENC to NEG........-0.3V to +6.0V NEG to GND.............................................................-6V to +0.3V C2N to GND .............................................................-6V to +0.3V C1P, C2P to GND .......................................-0.3V to (VIN + 0.3V) C2P to C1N..................................................-0.3V to (VIN + 0.3V) LED_, C1N, C2N to NEG .............................-0.3V to (VIN + 0.3V) Continuous Power Dissipation (TA = +70°C) 16-Pin Thin QFN 3mm x 3mm (derate 20.8mW/°C above +70°C).............................................................1667mW Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C PARAMETER CONDITIONS MIN TYP MAX UNITS IN Operating Voltage 2.7 5.5 V VDD Operating Voltage 1.7 5.5 V Undervoltage-Lockout (UVLO) Threshold VIN rising 2.35 2.45 2.55 V Undervoltage-Lockout Hysteresis 100 mV TA = +25°C 0.4 2.5IN Shutdown Supply Current (All Outputs Off) VSCL = VSDA = VDD (MAX8647), VEN_ = 0V (MAX8648) TA = +85°C 0.4 µA TA = +25°C 0.1 1.0 VDD Shutdown Supply Current TA = +85°C 0.1 µA Charge pump inactive, two LEDs enabled at 0.1mA setting 70 100 µA IN Operating Supply Current Charge pump active, 1MHz switching, all LEDs enabled at 0.1mA setting 1.6 mA Charge pump inactive, two LEDs enabled at 0.1mA setting, TA = +25°C 0.1 1.0 VDD Operating Supply Current Charge pump active, 1MHz switching, all LEDs enabled at 0.1mA setting, TA = +85°C 0.1 µA Thermal-Shutdown Threshold +160 °C Thermal-Shutdown Hysteresis 20 °C I2C INTERFACE (MAX8647) Logic-Input High Voltage (SDA, SCL) VDD = 1.7V to 5.5V, hysteresis = 0.2 x VDD (typ) 0.7 x VDD V Logic-Input Low Voltage (SDA, SCL) VDD = 1.7V to 5.5V, hysteresis = 0.2 x VDD (typ) 0.3 x VDD V Filtered Pulse Width (tSP) VIN = 2.7V to 5.5V, VDD = 1.7V to 5.5V (Note 2) 50 ns TA = +25°C -1 0.01 +1 Logic-Input Current (SDA, SCL) VIL = 0V or VIH = 5.5V TA = +85°C 0.1 µA

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M A X 8 6 4 7 /M A X 8 6 4 8 Ultra-Efficient Charge Pumps for Six White/RGB LEDs in 3mm x 3mm Thin QFN _______________________________________________________________________________________ 3 ELECTRICAL CHARACTERISTICS (continued) (VVDD = VIN = 3.6V, VGND = 0V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER CONDITIONS MIN TYP MAX UNITS SDA Output Low Voltage ISDA = 3mA, for acknowledge (Note 2) 0.03 0.40 V I2C Clock Frequency 400 kHz Bus Free Time Between START and STOP (tBUF) (Note 2) 1.3 µs Hold Time Repeated START Condition (tHD_STA) (Note 2) 0.6 0.1 µs SCL Low Period (tLOW) (Note 2) 1.3 0.2 µs SCL High Period (tHIGH) (Note 2) 0.6 0.2 µs Setup Time Repeated START Condition (tSU_STA) (Note 2) 0.6 0.1 µs SDA Hold Time (tHD_DAT) (Note 2) 0 -0.01 µs SDA Setup Time (tSU_DAT) (Note 2) 100 50 ns Setup Time for STOP Condition (tSU_STO) (Note 2) 0.6 0.1 µs SERIAL-PULSE LOGIC (EN_) (MAX8648) Logic-Input High Voltage VIN = 2.7V to 5.5V 1.4 V Logic-Input Low Voltage VIN = 2.7V to 5.5V 0.4 V TA = +25°C -1 0.01 +1 Logic-Input Current VIL = 0V or VIH = 5.5V TA = +85°C 0.1 µA EN Low Shutdown Delay tSHDN See Figure 3 and the Shutdown Mode section; EN_ needs to be longer than 4ms to ensure LED is powered off 4 ms tLO (Figure 3) 1 500 µs tHI (Figure 3) 1 µs Initial tHI (Figure 3) First EN_ high pulse 120 µs CHARGE PUMP Switching Frequency 1 MHz Soft-Start Time 0.5 ms Charge-Pump Regulation Voltage (VIN - VNEG) 4.3 5.0 V Open-Loop NEG Output Resistance (VNEG - 0.5 x VIN) / INEG 2.5 5 Ω NEG Discharge Resistance in Shutdown or When the Charge Pump is Inactive All LEDs off, EN_ = GND 10 kΩ LED1–LED6 CURRENT REGULATOR Current Setting Range Through an I2C or serial-pulse interface 0.1 24.0 mA 24mA setting, TA = +25°C -2 ±1 +2 24mA setting, TA = -40°C to derating function start temperature (Note 2) -5 +5Current Accuracy VLED_ = 0.5V for charge-pump inactive, VLED_ = -0.9V, VNEG_ = -1.4V 1.6mA setting, TA = +25°C -15 ±5 +15 %

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M A X 8 6 4 7 /M A X 8 6 4 8 Ultra-Efficient Charge Pumps for Six White/RGB LEDs in 3mm x 3mm Thin QFN 4 _______________________________________________________________________________________ Note 1: Limits are 100% production tested at TA = +25°C. Specifications over the operating temperature range are guaranteed by design. Note 2: Guaranteed by design. Note 3: LED dropout voltage is defined as the LED_ to GND voltage at which current into LED_ drops 10% from the value at VLED_ = 0.5V. ELECTRICAL CHARACTERISTICS (continued) (VVDD = VIN = 3.6V, VGND = 0V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER CONDITIONS MIN TYP MAX UNITS Derating-Function Start Temperature +60 °C Derating-Function Slope From derating-function start temperature -2.5 %/°C Not utilizing the charge pump 3 LED_ RDSON Utilizing the charge pump 4 Ω Not utilizing the charge pump 60 120 LED_ Dropout 24mA setting (Note 3) Utilizing the charge pump 90 200 mV LED_ Current Regulator Switchover Threshold (Inactive to Active) VLED_ falling 125 150 175 mV LED_ Current Regulator Switchover Hysteresis 100 mV TA = +25°C 0.01 5 LED_ Leakage in Shutdown All LEDs off TA = +85°C 0.1 µA Typical Operating Characteristics (VIN = 3.6V, VEN_ = VIN, circuit of Figure 1, TA = +25°C, unless otherwise noted.) EFFICIENCY vs. SUPPLY VOLTAGE (DRIVING SIX MATCHED LEDs) M A X 8 6 4 7 /4 8 t o c0 1 INPUT VOLTAGE (V) EF FI C IE N C Y ( % ) 3.93.63.33.0 10 20 30 40 50 60 70 80 90 100 0 2.7 4.2 1.6mA/LED 16mA/LED 20.8mA/LED 6.4mA/LED EFFICIENCY vs. Li+ BATTERY VOLTAGE (DRIVING SIX MATCHED LEDs) M A X 8 6 4 7 /4 8 t o c0 2 Li+ BATTERY VOLTAGE (V, TIME-WEIGHTED) EF FI C IE N C Y P LE D /P B A TT ( % ) 3.43.53.63.73.83.9 50 60 70 80 90 100 40 4.2 3.0 1.6mA/LED 20.8mA/LED 16mA/LED 6.4mA/LED EFFICIENCY vs. SUPPLY VOLTAGE (DRIVING SIX LEDs) M A X 8 6 4 7 /4 8 t o c0 3 INPUT VOLTAGE (V) EF FI C IE N C Y ( % ) 3.93.63.33.0 10 20 30 40 50 60 70 80 90 100 0 2.7 4.2 1.6mA/LED 16mA/LED LEDs HAVE MISMATCHED VF

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M A X 8 6 4 7 /M A X 8 6 4 8 Ultra-Efficient Charge Pumps for Six White/RGB LEDs in 3mm x 3mm Thin QFN _______________________________________________________________________________________ 5 EFFICIENCY vs. SUPPLY VOLTAGE (DRIVING SIX LEDs) M A X 8 6 4 7 /4 8 t o c0 4 INPUT VOLTAGE (V) EF FI C IE N C Y ( % ) 3.93.63.33.0 10 20 30 40 50 60 70 80 90 100 0 2.7 4.2 6.4mA/LED 20.8mA/LED LEDs HAVE MISMATCHED VF EFFICIENCY vs. Li+ BATTERY VOLTAGE (DRIVING SIX LEDs) M A X 8 6 4 7 /4 8 t o c0 5 Li+ BATTERY VOLTAGE (V, TIME-WEIGHTED) EF FI C IE N C Y P LE D /P B A TT ( % ) 3.43.53.63.73.83.9 50 60 70 80 90 100 40 4.2 3.0 1.6mA/LED 16mA/LED LEDs HAVE MISMATCHED VF EFFICIENCY vs. Li+ BATTERY VOLTAGE (DRIVING SIX LEDs) M A X 8 6 4 7 /4 8 t o c0 6 Li+ BATTERY VOLTAGE (V, TIME-WEIGHTED) EF FI C IE N C Y P LE D /P B A TT ( % ) 3.43.53.63.73.83.9 50 60 70 80 90 100 40 4.2 3.0 6.4mA/LED 20.8mA/LED LEDs HAVE MISMATCHED VF INPUT CURRENT vs. INPUT VOLTAGE (DRIVING SIX LEDs) M A X 8 6 4 7 /4 8 t o c0 7 INPUT VOLTAGE (V) IN P U T C U R R EN T (m A ) 3.73.2 20 40 60 80 100 120 140 160 180 200 0 2.7 4.2 LEDs HAVE MISMATCHED VF ILED = 16mA ILED = 20.8mA ILED = 6.4mA ILED = 1.6mA INPUT CURRENT vs. Li+ BATTERY VOLTAGE (DRIVING SIX LEDs) M A X 8 6 4 7 /4 8 t o c0 8 Li+ BATTERY VOLTAGE (V, TIME-WEIGHTED) IN P U T C U R R EN T (m A ) 3.53.6 3.43.73.83.9 20 40 60 80 100 120 140 160 180 200 0 4.2 3.0 1.6mA/LED 6.4mA/LED 16mA/LED 20.8mA/LED LEDs HAVE MISMATCHED VF INPUT CURRENT vs. INPUT VOLTAGE (RGB MODULE) M A X 8 6 4 7 /4 8 t o c0 9 INPUT VOLTAGE (V) IN P U T C U R R EN T (m A ) 3.73.2 10 20 30 40 50 60 70 80 90 100 0 2.7 4.2 ILED = 20.8mA ILED = 16mA ILED = 4.8mA ILED = 1.6mA RGB MODULE: LUMEX SML-LX3632SISUGSBC INPUT CURRENT vs. Li+ BATTERY VOLTAGE (RGB MODULE) M A X 8 6 4 7 /4 8 t o c1 0 Li+ BATTERY VOLTAGE (V, TIME-WEIGHTED) IN P U T C U R R EN T (m A ) 3.53.6 3.43.73.83.9 10 20 30 40 50 60 70 80 90 100 0 4.2 3.0 1.6mA/LED 6.4mA/LED 16mA/LED 20.8mA/LED RGB MODULE: LUMEX SML-LX3632SISUGSBC INPUT RIPPLE VOLTAGE vs. SUPPLY VOLTAGE (DRIVING SIX WHITE LEDs) M A X 8 6 4 7 /4 8 t o c1 1 SUPPLY VOLTAGE (V) IN P U T R IP P LE V O LT A G E (m V R M S ) 3.73.2 2 4 6 8 10 12 14 16 0 2.7 4.2 20.8mA/LED 16mA/LED 6.4mA/LED 1.6mA/LED LEDs HAVE MISMATCHED VF 15.0 15.6 15.4 15.2 16.0 15.8 16.8 16.6 16.4 16.2 17.0 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 LED CURRENT MATCHING vs. INPUT VOLTAGE (16mA/LED) M A X 8 6 4 7 /4 8 t o c1 2 INPUT VOLTAGE (V) LE D C U R R EN T (m A ) Typical Operating Characteristics (continued) (VIN = 3.6V, VEN_ = VIN, circuit of Figure 1, TA = +25°C, unless otherwise noted.)

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M A X 8 6 4 7 /M A X 8 6 4 8 Ultra-Efficient Charge Pumps for Six White/RGB LEDs in 3mm x 3mm Thin QFN 6 _______________________________________________________________________________________ 0 10 5 20 15 25 30 -40 10-15 35 60 85 LED CURRENT vs. TEMPERATURE M A X 8 6 4 7 /4 8 t o c1 3 TEMPERATURE (°C) LE D C U R R EN T (m A ) 400ns/div 1x MODE OPERATING WAVEFORMS (VIN = 4V) VIN IIN 100mA/div AC-COUPLED 100mV/div 20mA/div MAX8647/48 toc14 ILED 0A 0AALL LEDs ON ILED = 24mA 400ns/div 1.5x MODE OPERATING WAVEFORMS (VIN = 3V) VIN IIN 100mA/div AC-COUPLED 100mV/div 20mA/div MAX8647/48 toc15 ILED 0A 0AALL LEDs ON ILED = 24mA 1ms/div STARTUP AND SHUTDOWN (MAX8648) VEN_ VIN IIN 200mA/div AC-COUPLED 20mV/div 2V/div MAX8647/48 toc16 ILED5 0A 0A 2V/div ENA = ENB = ENC 10ms/div SINGLE-WIRE PULSE DIMMING (MAX8648) VEN_ 20mA/div MAX8647/48 toc17 TOTAL ILED5 0A 5V/div OPERATING IN 1x MODE, ALL 6 LEDs OPERATING 1ms/div LINE-TRANSIENT RESPONSE (VIN = 4.3V TO 3.8V TO 4.3V) VIN IIN 24mA 20mA/div 200mA/div MAX8647/48 toc18 ILED6 0A 4.3V 3.8V 1ms/div LINE-TRANSIENT RESPONSE WITH MODE CHANGE (VIN = 3.8V TO 3.4V TO 3.8V) VIN IIN 24mA 20mA/div 200mA/div MAX8647/48 toc19 ILED6 0mA 3.8V 3.4V Typical Operating Characteristics (continued) (VIN = 3.6V, VEN_ = VIN, circuit of Figure 1, TA = +25°C, unless otherwise noted.)

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M A X 8 6 4 7 /M A X 8 6 4 8 Ultra-Efficient Charge Pumps for Six White/RGB LEDs in 3mm x 3mm Thin QFN _______________________________________________________________________________________ 7 Pin Description PIN MAX8647 MAX8648 NAME FUNCTION 1 1 IN Supply Voltage Input. The input voltage range is 2.7V to 5.5V. Bypass IN to GND with a 1µF ceramic capacitor as close as possible to the IC. IN is high impedance during shutdown. Connect IN to the anodes of all the LEDs. 2 2 GND Ground. Connect GND to system ground and the input bypass capacitor as close as possible to the IC. 3 3 C1P Transfer Capacitor 1 Positive Connection. Connect a 1µF ceramic capacitor from C1P to C1N. 4 4 C2P Transfer Capacitor 2 Positive Connection. Connect a 1µF ceramic capacitor from C2P to C2N. 5 5 C2N Transfer Capacitor 2 Negative Connection. Connect a 1µF ceramic capacitor from C2P to C2N. An internal 10kΩ resistor pulls C2N to GND during shutdown. 6 6 C1N Transfer Capacitor 1 Negative Connection. Connect a 1µF ceramic capacitor from C1P to C1N. 7 7 NEG Charge-Pump Negative Output. Connect a 1µF ceramic capacitor from NEG to GND. In shutdown, an internal 10kΩ resistor pulls NEG to GND. Connect the exposed paddle to NEG directly under the IC. 8–13 8–13 LED6–LED1 LED Current Regulators. Current flowing into LED_ is based on the internal registers. Connect LED_ to the cathodes of the external LEDs. LED_ is high impedance during shutdown. For the MAX8647, program any unused LED_ to off and LED_ can be shorted to ground or left unconnected. For the MAX8648, short any unused LED_ to IN prior to power-up to disable the corresponding current regulator. 14 — SDA I2C Data Input. Data is read on the rising edge of SCL. 15 — SCL I2C Clock Input. Data is read on the rising edge of SCL. 16 — VDD Logic-Input Supply Voltage. Connect to the supply voltage driving SDA and SCL. Bypass VDD to GND with a 0.1µF ceramic capacitor. — 14, 15, 16 ENC, ENB, ENA Enable and Serial-Pulse Dimming Control. ENA controls LED1, LED2, and LED3. ENB controls LED4 and LED5. ENC controls LED6. Drive EN_ logic-high to turn on the IC and enable the corresponding LED_ at 24mA each. Drive an individual EN_ logic-low for greater than 4ms to turn off the corresponding-current regulators or drive all three EN_ low to place the IC in shutdown. See the Serial-Pulse Dimming Control (MAX8648) section. — — EP Exposed Paddle. Connect to NEG.

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M A X 8 6 4 7 /M A X 8 6 4 8 Ultra-Efficient Charge Pumps for Six White/RGB LEDs in 3mm x 3mm Thin QFN 8 _______________________________________________________________________________________ Detailed Description The MAX8647/MAX8648 have an inverting charge pump and six current regulators capable of 24mA each to drive six white LEDs or two sets of RGB LEDs. The current regulators are matched to within ±0.4% (typ) providing uniform white LED brightness for LCD back- light applications. To maximize efficiency, the current regulators operate with as little as 0.15V voltage drop. Individual white LED current regulators conduct current to GND or NEG to extend usable battery life. In the case of mismatched forward voltage of white LEDs, only the white LEDs requiring higher voltage are switched to pull current to NEG instead of GND, further raising efficiency and reducing battery current drain. Current-Regulator Switchover When VIN is higher than the forward voltage of the white LED plus the 0.15V headroom of the current regu- lator, the LED current returns through GND. If this con- dition is satisfied for all six white LEDs, the charge pump remains inactive. When the input voltage drops so that the current-regulator headroom cannot be main- tained for any of the individual white LEDs, the inverting charge pump activates and generates a voltage on the NEG pin that is no greater than 5V below VIN. Each cur- rent regulator contains circuitry that detects when it is in dropout and switches that current-regulator return path from GND to NEG. Since this is done on an LED- by-LED basis, the LED current is switched for only the individual LED requiring higher voltage, thus minimizing power consumption. Low LED Current Levels The MAX8647/MAX8648 internally generate a PWM sig- nal to obtain higher resolution at lower currents. See Single-Wire Pulse Dimming in the Typical Operating Characteristics section. As the ILED setting is below 6.4mA, the IC adjusts not only ILED DC current, but the duty cycle is controlled by the PWM signal. The fre- quency of the PWM dimming signal is set at 1kHz with a minimum duty cycle of 1/16 to avoid the LED flicking effect to human eyes. Table 1 shows the current level and the corresponding duty cycle. I2C Interface (MAX8647) An I2C 2-wire serial interface is provided on the MAX8647 to control the LEDs. The serial interface consists of a serial-data line (SDA) and a serial-clock line (SCL). Standard I2C write-byte commands are used. Figure 2 shows a timing diagram for the I2C pro- tocol. The MAX8647 is a slave-only device, relying upon a master to generate a clock signal. The master (typically a microprocessor) initiates data transfer on the bus and generates SCL to permit data transfer. A master device communicates with the MAX8647 by transmitting the proper 8-bit address (0x9A) followed by the 8-bit control byte. Each 8-bit control byte con- sists of a 3-bit command code and 5 bits of data (Table 1). Each transmit sequence is framed by a START (A) condition and a STOP (L) condition (Figure 2). Each word transmitted over the bus is 8 bits long and is always followed by an ACKNOWLEDGE CLOCK PULSE (K). The power-on default settings for D4 to D0 are all 0, which indicates that all LED_ are off. Serial-Pulse Dimming Control (MAX8648) When the LEDs are enabled by driving EN_ high, the MAX8648 ramps LED current to 24mA. Dim the LEDs by pulsing EN_ low (1µs to 500µs pulse width). Each pulse reduces the LED current based on the LED dim- ming table, Table 3. After the current reaches 0.1mA, the next pulse restores the current to 24mA. Figure 3 shows a timing diagram for EN_. ENA controls LED1, LED2, and LED3. ENB controls LED4 and LED5. ENC controls LED6. If dimming control is not required, EN_ work as simple 100% brightness or off controls. Drive EN_ high to enable the LEDs, or drive EN_ low to disable. The IC is shut- down when all three EN_ are low for 4ms or longer. Table 1. Internal PWM Duty Cycle vs. LED Set Current ILED (mA) DUTY CYCLE (n/16) ILED (mA) DUTY CYCLE (n/16) 6.4 16 1.2 12 5.6 14 1.0 10 4.8 12 0.8 8 4.0 10 0.7 7 3.2 16 0.6 6 2.8 14 0.5 5 2.4 12 0.4 4 2.0 10 0.3 3 1.6 16 0.2 2 1.4 14 0.1 1

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M A X 8 6 4 7 /M A X 8 6 4 8 Ultra-Efficient Charge Pumps for Six White/RGB LEDs in 3mm x 3mm Thin QFN _______________________________________________________________________________________ 9 CURRENT REGULATOR CURRENT REGULATOR CURRENT REGULATOR CURRENT REGULATOR CURRENT REGULATOR CURRENT REGULATOR EP IN GND MAX8647 MAX8648 LED5 LED4 LED3 LED2 LED1 LED6 NEG VIN 2.7V TO 5.5V SCL (ENB) C1 1μF C1P C1N C3 1μF C2P C2N C2 1μF TP7 VIN CURRENT SOURCE CONTROL I2C OR SERIAL PULSE INTERFACE AND CONTROL THERMAL SHUTDOWN SEL MIN C4 1μF 1MHz OSCILATOR INVERTING CHARGE PUMP VDD (ENA) SDA (ENC) ( ) ARE FOR THE MAX8648 BIAS Figure 1. Block Diagram and Application Circuit Shutdown Mode The MAX8647 is shutdown when all LEDs are turned off through the I2C port. In shutdown, the I2C port is still active and ready to receive a command. The MAX8648 is shutdown when all three EN_ are held low for 4ms or longer. In shutdown, NEG is pulled to GND with a 10kΩ internal resistor.

MAX8648ETE+T Reviews

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Libe*****Baral

November 21, 2020

Always meet my expectations with order and questions.

Cece*****Dudley

November 13, 2020

I tested some and all look good.

Robe*****Myers

November 13, 2020

I'm so sure that you're beating your competitor on delivery!

Oti*****oss

October 30, 2020

To be honest, I think you are doing an outstanding job.

Kel***** Kata

October 27, 2020

Does what it says. As with this this type of device it is important to have it mounted so that heat can dissipate. The higher the amperage the hotter the device.

MAX8648ETE+T Guarantees

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We provide 90 days warranty.

If the items you received were not in perfect quality, we would be responsible for your refund or replacement, but the items must be returned in their original condition.

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MAX8648ETE+T

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Heisener's commitment to quality has shaped our processes for sourcing, testing, shipping, and every step in between. This foundation underlies each component we sell.

ISO9001:2015, ICAS, IAF, UKAS

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