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MAX771EPA+

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MAX771EPA+

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Part Number MAX771EPA+
Manufacturer Maxim Integrated
Description IC REG CTRLR BOOST 8DIP
Datasheet MAX771EPA+ Datasheet
Package 8-DIP (0.300", 7.62mm)
In Stock 2,900 piece(s)
Unit Price $ 3.4900 *
Lead Time Can Ship Immediately
Estimated Delivery Time Sep 27 - Oct 2 (Choose Expedited Shipping)
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Part Number # MAX771EPA+ (PMIC - Voltage Regulators - DC DC Switching Controllers) 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.

For MAX771EPA+ specifications/configurations, quotation, lead time, payment terms of further enquiries please have no hesitation to contact us. To process your RFQ, please add MAX771EPA+ with quantity into BOM. Heisener.com does NOT require any registration to request a quote of MAX771EPA+.

MAX771EPA+ Specifications

ManufacturerMaxim Integrated
CategoryIntegrated Circuits (ICs) - PMIC - Voltage Regulators - DC DC Switching Controllers
Datasheet MAX771EPA+Datasheet
Package8-DIP (0.300", 7.62mm)
Series-
Output TypeTransistor Driver
FunctionStep-Up
Output ConfigurationPositive
TopologyBoost
Number of Outputs1
Output Phases1
Voltage - Supply (Vcc/Vdd)3 V ~ 16.5 V
Frequency - Switching300kHz
Duty Cycle (Max)-
Synchronous RectifierNo
Clock SyncNo
Serial Interfaces-
Control FeaturesEnable
Operating Temperature-40°C ~ 85°C (TA)
Package / Case8-DIP (0.300", 7.62mm)
Supplier Device Package8-PDIP

MAX771EPA+ Datasheet

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_______________General Description The MAX770–MAX773 step-up switching controllers pro- vide 90% efficiency over a 10mA to 1A load. A unique current-limited pulse-frequency-modulation (PFM) control scheme gives these devices the benefits of pulse-width-modulation (PWM) converters (high efficiency at heavy loads), while using less than 110µA of supply current (vs. 2mA to 10mA for PWM converters). These ICs use tiny external components. Their high switching frequencies (up to 300kHz) allow surface- mount magnetics of 5mm height and 9mm diameter. The MAX770/MAX771/MAX772 accept input voltages from 2V to 16.5V. Output voltages are preset at 5V, (MAX770), 12V (MAX771), and 15V (MAX772); they can also be adjusted using two resistors. The MAX773 accepts inputs from 3V to 16.5V. For a wider input range, it features an internal shunt regulator that allows unlimited higher input voltages. The MAX773’s out- put can be set to 5V, 12V, or 15V, or it can be adjusted with two resistors. The MAX770–MAX773 drive external N-channel MOSFET switches, allowing them to power loads up to 15W. If less power is required, use the MAX756/MAX757 or MAX761/MAX762 step-up switching regulators with on- board MOSFETs. ________________________Applications Palmtops/Handy-Terminals High-Efficiency DC-DC Converters Battery-Powered Applications Positive LCD-Bias Generators Portable Communicators Flash Memory Programmers ____________________________Features ♦ 90% Efficiency for 10mA to 1A Load Currents ♦ Up to 15W Output Power ♦ 110µA Max Supply Current ♦ 5µA Max Shutdown Current ♦ 2V to 16.5V Input Range (MAX770/MAX771/MAX772) ♦ Internal Shunt Regulator for High Input Voltages (MAX773) ♦ Preset or Adjustable Output Voltages MAX770: 5V or Adjustable MAX771: 12V or Adjustable MAX772: 15V or Adjustable MAX773: 5V, 12V, 15V, or Adjustable ♦ Current-Limited PFM Control Scheme ♦ 300kHz Switching Frequency ______________Ordering Information Ordering Information continued at end of data sheet. *Contact factory for dice specifications. **Contact factory for availability and processing to MIL-STD-883B. M A X 7 7 0 – M A X 7 7 3 5V/12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controllers ________________________________________________________________ Maxim Integrated Products 1 1 2 3 4 8 7 6 5 CS GND AGND REFSHDN FB V+ EXT MAX770 MAX771 MAX772 DIP/SO _________________Pin Configurations FB AGND GND V+ CS EXT N REF SHDNON/OFF OUTPUT 12V INPUT 2V TO VOUT MAX771 __________Typical Operating Circuit PART TEMP. RANGE PIN-PACKAGE MAX770CPA 0°C to +70°C Plastic DIP MAX770CSA 0°C to +70°C 8 SO MAX770C/D 0°C to +70°C Dice* MAX770EPA -40°C to +85°C 8 Plastic DIP MAX770ESA -40°C to +85°C 8 SO MAX770MJA -55°C to +125°C 8 CERDIP** TOP VIEW Pin Configurations continued at end of data sheet. 19-0202; Rev 2; 11/96 EVALU ATION KIT M ANUAL FOLLO WS DA TA SH EET For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468.

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M A X 7 7 0 – M A X 7 7 3 5V/12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controllers 2 _______________________________________________________________________________________ ABSOLUTE MAXIMUM RATINGS Supply Voltages V+ to GND.............................................................-0.3V to 17V V+ to SGND.............................................................-0.3V to 7V SGND........................................................-0.3V to (V+ + 0.3V) EXT, CS, REF, LBO, LBI, SHDN, FB.............-0.3V to (V+ + 0.3V) EXTH, EXTL ..................................................-0.3V to (V+ + 0.3V) V5, V12, V15 .............................................................-0.3V to 17V GND to AGND .........................................................0.1V to -0.1V ISGND ..................................................................................50mA Continuous Power Dissipation (TA = +70°C) 8-Pin Plastic DIP (derate 9.09mW/°C above +70°C)....727mW 8-Pin SO (derate 5.88mW/°C above +70°C) ................471mW 8-Pin CERDIP (derate 8.00mW/°C above +70°C) ........640mW 14-Pin Plastic DIP (derate 10.00mW/°C above +70°C) .............................800mW 14-Pin SO (derate 8.33mW/°C above +70°C) ..............667mW 14-Pin CERDIP (derate 9.09mW/°C above +70°C) ......727mW Operating Temperature Ranges MAX77_C__ ........................................................0°C to +70°C MAX77_E__......................................................-40°C to +85°C MAX77_MJ_ ...................................................-55°C to +125°C Junction Temperatures MAX77_C__/E__ ..........................................................+150°C MAX77_MJ_..................................................................+175°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering, 10sec) .............................+300°C 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. ELECTRICAL CHARACTERISTICS (V+ = 5V, ILOAD = 0mA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Current 85 110 µ A Standby Current 2 5 µ A 4 Output Voltage (Note 1) V+ = 2.0V to 5.0V, over full load range 4.80 5.0 5.20 VV+ = 2.0V to 12.0V, over full load range 11.52 12.0 12.48 V+ = 2.0V to 15.0V, over full load range 14.40 15.0 15.60 Figure 2a, V+ = 2.7V to 4.5V, ILOAD = 700mA, VOUT = 5V 5 mV/V Figure 2a, V+ = 3V, ILOAD = 30mA to 1A, VOUT = 5V 20 mV/A Maximum Switch On-Time tON(max) 12 16 20 µ s Minimum Switch Off-Time tOFF(min) 1.8 2.3 2.8 µ s Efficiency 87 % Reference Voltage VREF IREF = 0µ A MAX77_C 1.4700 1.5 1.5300 VMAX77_E 1.4625 1.5 1.5375 MAX77_M 1.4550 1.5 1.5450 Output Voltage Line Regulation (Note 2) Output Voltage Load Regulation (Note 2) V+ = 4V, ILOAD = 500mA, VOUT = 5V V+ = 10.0V, SHDN ≥ 1.6V (shutdown) V+ = 16.5V, SHDN ≥ 1.6V (shutdown) V+ = 16.5V, SHDN = 0V (normal operation) Minimum Start-Up Voltage MAX770/MAX771/MAX772 1.8 2.0 V MAX770–772 (internal feedback resistors) 2.0 16.5 MAX770–772C/E (external resistors) 3.0 16.5 MAX770–772MJA (external resistors) 3.1 16.5 MAX773C/E 3.0 16.5 MAX773MJD 3.1 16.5 Input Voltage Range V

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M A X 7 7 0 – M A X 7 7 3 5V/12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controllers _______________________________________________________________________________________ 3 ELECTRICAL CHARACTERISTICS (continued) (V+ = 5V, ILOAD = 0mA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETERS SYMBOL CONDITIONS MIN TYP MAX UNITS REF Load Regulation 0µ A ≤ IREF ≤ 100µ A MAX77_C/E 4 10 mV MAX77_M 4 15 REF Line Regulation 3V ≤ V+ ≤ 16.5V 40 100 µ V/V FB Trip-Point Voltage VFB MAX77_C 1.4700 1.50 1.5300 VMAX77_E 1.4625 1.50 1.5375 MAX77_M 1.4550 1.50 1.5450 FB Input Current IFB MAX77_C ±20 nAMAX77_E ±40 MAX77_M ±60 SHDN Input High Voltage VIH V+ = 2.0V to 16.5V 1.6 V SHDN Input Low Voltage VIL MAX77_C/E, V+ = 2.0V to 16.5V 0.4 V SHDN Input Current ±1 µ A LBI Input Current MAX773, V+ = 16.5V, LBI = 1.5V ±20 nA LBI Hysteresis MAX773 20 LBI Threshold Voltage MAX773, LBI falling MAX77_C 1.4700 1.50 1.5300 VMAX77_E 1.4625 1.50 1.5375 MAX77_M 1.4550 1.50 1.5450 LBO Leakage Current MAX773, V+ = 16.5V, VLBO = 16.5V 0.01 1.00 µ A LBO Output Voltage Low VOL MAX773, V+ = 5V, LBO sinking 1mA 0.1 0.4 V V+ = 16.5V, SHDN = 0V or V+ mV Current-Limit Trip Level VCS V+ = 5V to 16.5V 170 200 230 mV VSHUNT MAX773, ISHUNT = 1mA to 20mA, SGND = 0V, CSHUNT = 0.1µ F 5.5 6.3 V CS Input Current 0.01 ±1 µ A EXT Rise Time V+ = 5V, 1nF from EXT to ground (Note 3) 55 ns EXT Fall Time V+ = 5V, 1nF from EXT to ground (Note 3) 55 ns Supply Voltage in Shunt Mode Note 1: Output voltage guaranteed using preset voltages. See Figures 7a–7d for output current capability versus input voltage. Note 2: Output voltage line and load regulation depend on external circuit components. Note 3: For the MAX773, EXT is EXTH and EXTL shorted together. LBI Delay 5mV overdrive 2.5 µs MAX77_M, V+ = 2.0V to 16.5V 0.2

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0 1 2 3 4 -75 -50 -25 0 25 50 75 100 125 SUPPLY CURRENT vs. TEMPERATURE TEMPERATURE (°C) S U P P L Y C U R R E N T ( m A ) VOUT = 12V, VIN = 5V CIRCUIT OF FIGURE 2b BOOTSTRAPPED MODE ENTIRE CIRCUIT SCHOTTKY DIODE LEAKAGE EXCLUDED M A X 7 7 0 – 3 -0 7 0 0.2 0.4 0.6 0.8 2 4 6 8 10 12 SUPPLY CURRENT vs. SUPPLY VOLTAGE SUPPLY VOLTAGE (V) S U P P L Y C U R R E N T ( m A ) VOUT = 12V NON-BOOTSTRAPPED CIRCUIT OF FIGURE 2c BOOTSTRAPPED CIRCUIT OF FIGURE 2b M A X 7 7 0 – 3 -0 8 0 100 150 200 250 50 2 4 6 8 10 12 EXT RISE/FALL TIME vs. SUPPLY VOLTAGE V+ (V) E X T R IS E /F A L L T IM E ( n s) CEXT = 2200pF CEXT = 1000pF CEXT = 446pF CEXT = 100pF M A X 7 7 0 – 3 -0 9 100 50 0.001 0.01 0.1 1 MAX772 EFFICIENCY vs. OUTPUT CURRENT (BOOTSTRAPPED) 60 OUTPUT CURRENT (A) E FF IC IE N C Y ( % ) 70 80 90 VOUT = 15V, CIRCUIT OF FIGURE 2b MAX772 SUBSTITUTED FOR MAX771 VIN = 12V VIN = 9V VIN = 6V VIN = 5V VIN = 3V M A X 7 7 0 – 3 -0 3 50 60 70 80 90 100 0.001 0.01 1 MAX771 EFFICIENCY vs. OUTPUT CURRENT (BOOTSTRAPPED) OUTPUT CURRENT (A) E FF IC IE N C Y ( % ) 0.1 VIN = 6V VIN = 5V VIN = 3V VIN = 9V VOUT = 12V CIRCUIT OF FIGURE 2b M A X 7 7 0 – 3 -0 2100 50 0.001 0.01 0.1 1 MAX770 EFFICIENCY vs. OUTPUT CURRENT (BOOTSTRAPPED) 60 OUTPUT CURRENT (A) E FF IC IE N C Y ( % ) 70 80 90 VIN = 3V VIN = 3.5V VOUT = 5V CIRCUIT OF FIGURE 2a VIN = 4V M A X 7 7 0 – 3 -0 1 M A X 7 7 0 – M A X 7 7 3 5V/12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controllers 4 _______________________________________________________________________________________ __________________________________________Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) 70 80 90 100 0.001 0.01 0.1 101 MAX771 EFFICIENCY vs. OUTPUT CURRENT (NON-BOOTSTRAPPED) OUTPUT CURRENT (A) E FF IC IE N C Y ( % ) VIN = 9V VIN = 6V VIN = 5V VOUT = 12V CIRCUIT OF FIGURE 2c M A X 7 7 0 – 3 -0 4 0 100 200 300 400 500 600 700 1.0 MAX770 LOAD CURRENT vs. MINIMUM START-UP INPUT VOLTAGE MINIMUM START-UP INPUT VOLTAGE (V) L O A D C U R R E N T ( m A ) 3.01.5 2.5 3.52.0 ABOVE 3.4V, THE CIRCUIT STARTS UP UNDER MAXIMUM LOAD CONDITIONS VOUT = 5V CIRCUIT OF FIGURE 2a M A X 7 7 0 – 3 -0 5 0 100 200 300 400 500 2.0 MAX771 LOAD CURRENT vs. MINIMUM START-UP INPUT VOLTAGE MINIMUM START-UP INPUT VOLTAGE (V) L O A D C U R R E N T ( m A ) 4.02.5 3.53.0 ABOVE 3.5V THE CIRCUIT STARTS UP UNDER MAXIMUM LOAD CONDITIONS VOUT = 12V CIRCUIT OF FIGURE 2b M A X 7 7 0 – 3 -0 6

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M A X 7 7 0 – M A X 7 7 3 5V/12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controllers _______________________________________________________________________________________ 5 250 0 -60 -20 60 140 REFERENCE OUTPUT RESISTANCE vs. TEMPERATURE 50 M A X 7 7 0 – 3 -1 0 TEMPERATURE (°C) R E FE R E N C E O U T P U T R E S IS T A N C E ( Ω ) 20 100 150 -40 0 8040 120 100 200 100µA 50µA 10µA 1.502 -60 -20 60 140 REFERENCE vs. TEMPERATURE M A X 7 7 0 – 3 -1 1 TEMPERATURE (°C) R E FE R E N C E ( V ) 20 100-40 0 8040 120 1.500 1.498 1.496 1.494 1.492 1.504 1.506 4.0 -60 -20 60 140 SHUTDOWN CURRENT vs. TEMPERATURE M A X 7 7 0 – 3 -1 2 TEMPERATURE (°C) I C C (µ A ) 20 100-40 0 8040 120 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 V+ = 15V V+ = 4V V+ = 8V 15.5 16.0 16.5 -60 -30 0 30 60 90 120 150 MAXIMUM SWITCH ON-TIME vs. TEMPERATURE TEMPERATURE (°C) t O N (M A X ) (µ s) M A X 7 7 0 – 3 -1 3 2.20 2.25 2.30 -60 -30 0 30 60 90 120 150 MINIMUM SWITCH OFF-TIME vs. TEMPERATURE TEMPERATURE (°C) t O FF (M IN ) (µ s) M A X 7 7 0 – 3 -1 4 6.0 7.0 8.0 -60 -30 0 30 60 90 120 150 MAXIMUM SWITCH ON-TIME/ MINIMUM SWITCH OFF-TIME RATIO vs. TEMPERATURE TEMPERATURE (°C) t O N (M A X )/ t O FF (M IN ) R A T IO M A X 7 7 0 – 3 -1 5 7.5 6.5 ____________________________Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.)

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M A X 7 7 0 – M A X 7 7 3 5V/12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controllers 6 _______________________________________________________________________________________ VIN = 2.9V, IOUT = 0.9A A: EXT VOLTAGE, 5V/div B: INDUCTOR CURRENT 1A/div C: VOUT RIPPLE 100mV/div, AC-COUPLED MAX770 HEAVY-LOAD SWITCHNG WAVEFORMS 20µs/div VOUT 0 A ILIM ILIM 2 B C 0 V+ = 3V, IOUT = 165mA A: EXT VOLTAGE, 5V/div B: INDUCTOR CURRENT, 1A/div C: VOUT RIPPLE 100mV/div, AC-COUPLED MAX770 LIGHT-LOAD SWITCHING WAVEFORMS 20µs/div 0 B A C ILIM 2 IOUT = 0.7A A: VIN, 2.7V TO 4.5V, 2V/div B: VOUT RIPPLE, 100mV/div, AC-COUPLED MAX770 LINE-TRANSIENT RESPONSE A B 4.5V 2.7V 0 2ms/div VIN = 3V A: LOAD CURRENT 0.5A/div (0A to 1A) B: VOUT RIPPLE, 100mV/div, AC-COUPLED MAX770 LOAD-TRANSIENT RESPONSE 2ms/div A B 0 ____________________________Typical Operating Characteristics (continued) (Circuit of Figure 2a, TA = +25°C, unless otherwise noted.)

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M A X 7 7 0 – M A X 7 7 3 5V/12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controllers _______________________________________________________________________________________ 7 VIN = 3V, IOUT = 0.5A A: SHDN, 2V/div B: VOUT, 2V/div MAX770 EXITING SHUTDOWN A B 0 0 200µs/div ______________________________________________________________Pin Description ____________________________Typical Operating Characteristics (continued) (Circuit of Figure 2a, TA = +25°C, unless otherwise noted.) PIN NAME FUNCTION MAX773 1 — EXT Gate drive for external N-channel power transistor 2 3 V+ 3 6 FB 4 7 SHDN 5 8 REF 6 — AGND Analog ground 7 9 GND High-current ground return for the output driver 8 11 CS — 1 V12 — 2 V5 MAX770 MAX771 MAX772 Power-supply input. Also acts as a voltage-sense point when in bootstrapped mode for the MAX770/MAX771/MAX772, or as a shunt regulator when SGND is connected to ground for the MAX773. Bypass to SGND with 0.1µ F when using the shunt regulator. Feedback input for adjustable-output operation. Connect to ground for fixed-output operation. Use a resistor divider network to adjust the output voltage. See Setting the Output Voltage section. Active-high TTL/CMOS logic-level shutdown input. In shutdown mode, VOUT is a diode drop below V+ (due to the DC path from V+ to the output) and the supply current drops to 5µ A maximum. Connect to ground for normal operation. 1.5V reference output that can source 100µ A for external loads. Bypass to GND with 0.1µ F. The reference is disabled in shutdown. Positive input to the current-sense amplifier. Connect the current-sense resistor between CS and GND. Input sense point for 12V-output operation. Connect VOUT to V12 for 12V-output operation. Leave unconnected for adjustable-output operation. Input sense point for 5V-output operation. Connect VOUT to V5 for 5V-output operation. Leave unconnected for adjustable-output operation. — 4 LBO — 5 LBI Input to the internal low-battery comparator. Tie to GND or V+ if not used. — 10 SGND Shunt regulator ground. Leave unconnected if the shunt regulator is not used. Low-battery output is an open-drain output that goes low when LBI is less than 1.5V. Connect to V+ through a pull-up resistor. Leave floating if not used. LBO is high impedance in shutdown mode.

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M A X 7 7 0 – M A X 7 7 3 5V/12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controllers 8 _______________________________________________________________________________________ _______________Detailed Description The MAX770–MAX773 are BiCMOS, step-up, switch- mode power-supply controllers that provide preset 5V, 12V, and 15V output voltages, in addition to adjustable- output operation. Their unique control scheme com- bines the advantages of pulse-frequency modulation (low supply current) and pulse-width modulation (high efficiency with heavy loads), providing high efficiency over a wide output current range, as well as increased output current capability over previous PFM devices. In addition, the external sense resistor and power transistor allow the user to tailor the output current capability for each application. Figure 1 shows the MAX770–MAX773 block diagram. The MAX770–MAX773 offer three main improvements over prior pulse-skipping control solutions: 1) the con- verters operate with tiny (5mm height and less than 9mm diameter) surface-mount inductors due to their 300kHz switching frequency; 2) the current-limited PFM control scheme allows 87% efficiencies over a wide range of load currents; and 3) the maximum supply current is only 110µA. The MAX773 can be configured to operate from an internal 6V shunt regulator, allowing very high input/out- put voltages. Its output can be configured for an adjustable voltage or for one of three fixed voltages (5V, 12V, or 15V), and it has a power-fail comparator for low-battery detection. All devices have shutdown capability, reducing the supply current to 5µA max. Bootstrapped/Non-Bootstrapped Modes Figures 2 and 3 show standard application circuits for bootstrapped and non-bootstrapped modes. In boot- strapped mode, the IC is powered from the output (VOUT, which is connected to V+) and the input voltage range is 2V to VOUT. The voltage applied to the gate of the external power transistor is switched from VOUT to ground, providing more switch gate drive and thus reducing the transistor’s on resistance. In non-bootstrapped mode, the IC is powered from the input voltage (V+) and operates with minimum supply current. In this mode, FB is the output voltage sense point. Since the voltage swing applied to the gate of the external power transistor is reduced (the gate swings from V+ to ground), the power transistor’s on resistance increases at low input voltages. However, the supply current is also reduced because V+ is at a lower volt- age, and because less energy is consumed while charging and discharging the external MOSFET’s gate capacitance. The minimum input voltage for the MAX770–MAX773 is 3V when using external feedback resistors. With supply voltages below 5V, bootstrapped mode is recommended. Note: When using the MAX770/MAX771/MAX772 in non-bootstrapped mode, there is no preset output operation because V+ is also the output voltage sense point for fixed-output operation. External resistors must be used to set the output voltage. Use 1% external feedback resistors when operating in adjustable-output mode (Figures 2c, 2d, 3b, 3d, 3e) to achieve an overall output voltage accuracy of ±5%. The MAX773 can be operated in non-bootstrapped mode without using external feedback resistors because V+ does not act as the output voltage sense point with preset-output operation. To achieve high- est efficiency, operate in bootstrapped mode when- ever possible. MAX773 Shunt-Regulator Operation The MAX773 has an internal 6V shunt regulator that allows the device to step up from very high input voltages (Figure 4). PIN NAME FUNCTIONMAX770 MAX771 MAX772 MAX773 — 13 EXTH — 12 EXTL Low-level gate/base drive for external power transistor. Connect to the gate of an external N-channel MOSFET or to the base of an external NPN transistor. — 14 V15 Input sense point for 15V-output operation. Connect VOUT to V15 for 15V-output operation. Leave unconnected for adjustable-output operation _________________________________________________Pin Description (continued) High-level gate/base drive for external power transistor. Connect to EXTL when using an external N-channel MOSFET. When using an external NPN transistor, connect a resistor RBASE from EXTH to the base of the NPN to set the maximum base-drive current.

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Floating the shunt-regulator ground (SGND) disables the shunt regulator. To enable it, connect SGND to GND. The shunt regulator requires 1mA minimum cur- rent for proper operation; the maximum current must not exceed 20mA. The MAX773 operates in non-boot- strapped mode when the shunt regulator is used, and EXT swings between the 6V shunt-regulator voltage and GND. When using the shunt regulator, use an N-channel pow- er FET instead of an NPN power transistor as the power switch. Otherwise, excessive base drive will collapse the shunt regulator. External Power-Transistor Control Circuitry PFM Control Scheme The MAX770–MAX773 use a proprietary current-limited PFM control scheme to provide high efficiency over a wide range of load currents. This control scheme com- bines the ultra-low supply current of PFM converters (or pulse skippers) with the high full-load efficiency of PWM converters. Unlike traditional PFM converters, the MAX770– MAX773 use a sense resistor to control the peak induc- tor current. They also operate with high switching M A X 7 7 0 – M A X 7 7 3 5V/12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controllers _______________________________________________________________________________________ 9 V+ EXT CONTROL 1.5V REFERENCE Q TRIG QS F/F R QTRIG LOW-VOLTAGE OSCILLATOR 2.5V 0.1V0.2V ONE-SHOT ONE-SHOT CURRENT-SENSE AMPLIFIER DUAL-MODE COMPARATOR LBO V15 V12 V5 FB LBI REF 200mV ERROR COMPARATOR SHDN V+ SGND 6V EXTH EXTL EXT CS MAX773 ONLY MAX770 MAX771 MAX772 MAX770 MAX771 MAX772 BIAS CIRCUITRY N N N MAX770–MAX773 MAX773 ONLY Figure 1. Block Diagram

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RER40F1020RCSL RER40F1020RCSL Vishay Dale, RES CHAS MNT 102 OHM 1% 5W, Axial, Box, - View
1959740000 1959740000 Weidmuller, TERM BLOCK PLUG 3POS 90DEG 5MM, -, - View
RJHSEJ385A8 RJHSEJ385A8 Amphenol Commercial Products, CONN MOD JACK 8P8C R/A SHLD, -, - View
MS27473T16B8SALC MS27473T16B8SALC Amphenol Aerospace Operations, CONN PLUG HSG FMALE 8POS INLINE, -, - View
EYM28DTMT-S189 EYM28DTMT-S189 Sullins Connector Solutions, CONN EDGE DUAL FMALE 56POS 0.156, -, - View
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MAX771EPA+

Certified Quality

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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