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MAX868EUB+

hotMAX868EUB+

MAX868EUB+

For Reference Only

Part Number MAX868EUB+
Manufacturer Maxim Integrated
Description IC REG SWITCHD CAP INV 10UMAX
Datasheet MAX868EUB+Datasheet
Package 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
In Stock 11570 piece(s)
Unit Price $ 3.69 *
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MAX868EUB+Specifications

ManufacturerMaxim Integrated
CategoryIntegrated Circuits (ICs) - PMIC - Voltage Regulators - DC DC Switching Regulators
Datasheet MAX868EUB+Datasheet
Package10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
Series-
FunctionRatiometric
Output ConfigurationPositive or Negative
TopologyCharge Pump
Output TypeFixed
Number of Outputs1
Voltage - Input (Min)1.8V
Voltage - Input (Max)5.5V
Voltage - Output (Min/Fixed)-Vin, 2Vin
Current - Output30mA
Frequency - Switching270kHz ~ 630kHz
Synchronous RectifierNo
Operating Temperature-40°C ~ 85°C (TA)
Mounting TypeSurface Mount
Package / Case10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
Supplier Device Package10-uMAX

MAX868EUB+Datasheet

Page 1

Page 2

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. General Description The MAX868 inverting charge pump provides a low-cost and compact means of generating a regulated negative voltage up to -2 x VIN from a positive input voltage between 1.8V and 5.5V. It uses a pulse-frequency- modulation (PFM) control scheme to generate the regulat- ed negative output voltage. PFM operation is obtained by gating the internal 450kHz oscillator on and off as needed to maintain output voltage regulation. This unique on-demand switching scheme gives the MAX868 excellent light-load efficiency without degrading its full- load operation (up to 30mA), permitting smaller capaci- tors to take advantage of the oscillator’s high switching frequency. The MAX868 requires no inductors; only four capacitors are required to build a complete DC-DC converter. Output voltage regulation is achieved by adding just two resistors. The MAX868 comes in a 10-pin µMAX pack- age, which is only 1.11mm high and occupies just half the board area of a standard 8-pin SO. ________________________Applications Small LCD Panels Cell Phones Cordless Phones Camcorders Handy-Terminals, PDAs Medical Instruments Battery-Operated Equipment ____________________________Features ♦ Regulated Negative Output Voltage (up to -2 x VIN) ♦ Ultra-Small, 10-Pin µMAX Package ♦ On-Demand Switching at up to 450kHz ♦ 30µA Quiescent Supply Current ♦ Requires Only Four Small External Capacitors ♦ 1.8V to 5.5V Input Voltage Range ♦ 0.1µA Logic-Controlled Shutdown ♦ Up to 30mA Output Current M A X 8 6 8 Regulated, Adjustable -2x Inverting Charge Pump ________________________________________________________________ Maxim Integrated Products 1 1 2 3 4 5 10 9 8 7 6 FB SHDN C2+ INPGND C1- OUT GND MAX868 µMAX TOP VIEW C2-C1+ Configuration MAX868 C1+ IN PGND SHDN GND FB OUT 0.1µF 1µF 2.2µF VOUT = 0V TO -2 x VIN VIN = 1.8V TO 5.5V 0.1µF C1- C2+ C2- Typical Operating Circuit 19-1290; Rev 1; 2/98 PART MAX868C/D MAX868EUB -40°C to +85°C 0°C to +70°C TEMP. RANGE PIN-PACKAGE Dice* 10 µMAX Ordering Information *Dice are tested at TA = +25°C.

Page 3

M A X 8 6 8 Regulated, Adjustable -2x Inverting Charge Pump 2 _______________________________________________________________________________________ ABSOLUTE MAXIMUM RATINGS ELECTRICAL CHARACTERISTICS (VIN = +3.3V, SHDN = IN, C1 = C2 = 0.22µF, CIN = 1µF, COUT = 10µF, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°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. IN to GND.................................................................-0.3V to +6V OUT to GND ...........................................................+0.3V to -12V IN to OUT.................................................................-0.3V to -17V C1+ to GND ........................................(VIN - 12V) to (VIN + 0.3V) C1- to GND.............................................................+0.3V to -12V C2+ to GND....................................................(VIN + 0.3V) to -6V C2- to GND...............................................................+0.3V to -6V SHDN, FB to GND .......................................-0.3V to (VIN + 0.3V) PGND to GND .......................................................-0.3V to +0.3V Output Current ....................................................................35mA Short-Circuit Duration.................................................Continuous Continuous Power Dissipation (TA = +70°C) 10-pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW Operating Temperature Range MAX868EUB ....................................................-40°C to +85°C Storage Temperature Range .............................-65°C to +160°C Lead Temperature (soldering, 10sec) .............................+300°C FB = IN No load, VFB = -50mV RL = 3kΩ to GND VIN = 5.5V, SHDN = IN or GND VIN = 1.8V to 5.5V SHDN = GND (OUT pulls to GND) VIN = 1.8V to 5.5V, TA = +25°C IOUT = 5mA, FB = IN No load, SHDN = GND VFB = 50mV Closed loop VOUT = -5V CONDITIONS nA-100 1 100SHDN Input Bias Current V 0.7VINVIH SHDN Input Threshold 0.3VINVIL nA-50 1 50FB Input Bias Current mA 30 IOUTOutput Current 12 mA5 IINSupply Current µA30 50 V1.8 5.5VINSupply-Voltage Range mV-30 30 15 50 ROUT Open-Loop Output Resistance Ω125 70 100 µA0.1 1IIN,SHDNShutdown Current kHz 293 450 607 Oscillator Frequency 270 630 fOSC Ω0.2ROUT,CL Closed-Loop Output Resistance UNITSMIN TYP MAXSYMBOLPARAMETER TA = +25°C TA = 0°C to +85°C TA = +25°C TA = 0°C to +85°C VIN = 3.3V, VOUT = -5V VIN = 5V, VOUT = -3.3V VIN = 1.8V to 5.5V mV-40 40 FB Trip Point TA = 0°C to +85°C TA = +25°C

Page 4

M A X 8 6 8 Regulated, Adjustable -2x Inverting Charge Pump _______________________________________________________________________________________ 3 ELECTRICAL CHARACTERISTICS (VIN = +3.3V, C1 = C2 = 0.22µF, CIN = 1µF, COUT = 10µF, TA = -40°C to +85°C, unless otherwise noted. (Note 1) Note 1: Specifications to -40°C are guaranteed by design, not production tested. RL = 3kΩ to GND VFB = 50mV No load, VFB = -50mV No load, SHDN = GND CONDITIONS kHz270 630fOSCOscillator Frequency µA1IIN,SHDNShutdown Current V1.8 5.5VINSupply-Voltage Range µA55IINSupply Current UNITSMIN TYP MAXSYMBOLPARAMETER IOUT = 5mA, FB = IN VIN = 1.8V to 5.5V SHDN = GND (OUT pulls to GND) VIN = 1.8V to 5.5V nA-100 100FB Input Bias Current mV-40 40FB Trip Point 125Open-Loop Output Resistance Ω 50 ROUT VIN = 5.5V, SHDN = IN or GND VIN = 1.8V to 5.5V nA-100 100SHDN Input Bias Current V 0.7VINVIH SHDN Input Threshold 0.3VINVIL __________________________________________Typical Operating Characteristics (Circuit of Figure 5, TA = +25°C, unless otherwise noted.) -35 -25 -30 -20 -5 0 -10 -15 5 0 10 15 20 255 30 35 40 45 50 LOAD-REGULATION ERROR vs. LOAD CURRENT (VIN = 5V) M A X 8 6 8 -0 1 LOAD CURRENT (mA) LO A D -R EG U LA TI O N E R R O R ( m V ) VOUT = -7.5V VOUT = -3.3V VOUT = -5V -15 -9 -12 0 -3 -6 3 0 5 10 15 20 25 LOAD-REGULATION ERROR vs. LOAD CURRENT (VIN = 3.3V) M A X 8 6 8 -0 2 LOAD CURRENT (mA) LO A D -R EG U LA TI O N E R R O R ( m V ) VOUT = -3.3V VOUT = -5V 400 410 430 440 420 480 470 460 450 500 490 -40 -20 0 20 40 60 80 100 MAXIMUM SWITCHING FREQUENCY vs. TEMPERATURE M A X 8 6 8 -0 3 TEMPERATURE (°C) M A X IM U M S W IT C H IN G F R EQ U EN C Y ( kH z) FB = IN VIN = 3.3V VIN = 2V VIN = 5V

Page 5

M A X 8 6 8 Regulated, Adjustable -2x Inverting Charge Pump 4 _______________________________________________________________________________________ ____________________________Typical Operating Characteristics (continued) (Circuit of Figure 5, TA = +25°C, unless otherwise noted.) 0 0.01 10.1 10 100 EFFICIENCY vs. LOAD CURRENT (VIN = 5V) 10 M A X 8 6 8 -0 4 LOAD CURRENT (mA) EF FI C IE N C Y ( % ) 50 40 30 20 60 70 80 VOUT = -5V VOUT = -7.5V VOUT = -3.3V 0 0.01 10.1 10 100 EFFICIENCY vs. LOAD CURRENT (VIN = 3.3V) 10 M A X 8 6 8 -0 5 LOAD CURRENT (mA) EF FI C IE N C Y ( % ) 50 40 30 20 60 70 80 VOUT = -5V VOUT = -3.3V 0 0.01 10.1 10 100 EFFICIENCY vs. LOAD CURRENT (VIN = 5V) 10 M A X 8 6 8 -0 6 LOAD CURRENT (mA) EF FI C IE N C Y ( % ) 50 40 30 20 60 70 80 CIRCUIT OF FIGURE 6 VOUT = -2.5V VOUT = -3.3V 0 60 40 20 100 80 180 160 140 120 200 -40 -20 0 20 40 60 80 100 OPEN-LOOP OUTPUT IMPEDANCE vs. TEMPERATURE (FB = IN, VOUT = -2 x VIN) M A X 8 6 8 -0 7 TEMPERATURE (°C) O U TP U T IM P ED A N C E (Ω ) VIN = 2V VIN = 3.3V VIN = 5V 20µs/div 20mV/div VIN = 3.3V, VOUT = -3.3V, ILOAD = 5mA, VOUT AC COUPLED (20mV/div), COUT = 10µF CERAMIC OUTPUT VOLTAGE RIPPLE (COUT = 10µF CERAMIC) M A X 8 6 8 -1 0 0 60 40 20 100 80 180 160 140 120 200 -40 -20 0 20 40 60 80 100 OPEN-LOOP OUTPUT IMPEDANCE vs. TEMPERATURE (FB = IN, VOUT = -VIN) M A X 8 6 8 -0 8 TEMPERATURE (°C) O U TP U T IM P ED A N C E (Ω ) VIN = 2V CIRCUIT OF FIGURE 6 VIN = 3.3V VIN = 5V 20µs/div 20mV/div VIN = 3.3V, VOUT = -3.3V, ILOAD = 5mA, VOUT AC COUPLED (20mV/div), COUT = 10µF (AVX TPS) OUTPUT VOLTAGE RIPPLE (COUT = 10µF TANTALUM) M A X 8 6 8 -0 9 20µs/div 20mV/div VIN = 3.3V, VOUT = -3.3V, ILOAD = 5mA, VOUT AC COUPLED (20mV/div), COUT = 2.2µF CERAMIC OUTPUT VOLTAGE RIPPLE M A X 8 6 8 -1 1 200µs/div 10mA/div 20mV/div VIN = 5V, VOUT = -5V, IOUT = 1mA TO 11mA STEP LOAD-TRANSIENT RESPONSE M A X 8 6 8 -1 2

Page 6

Detailed Description The MAX868 inverting charge pump uses pulse- frequency-modulation (PFM) control to generate a reg- ulated negative output voltage up to -2 x VIN. PFM operation is obtained by enabling the internal 450kHz oscillator as needed to maintain output voltage regula- tion. This control scheme reduces supply current at light loads and permits the use of small capacitors. The functional diagram shown in Figure 1 indicates the two phases of MAX868 operation: charge phase (Φ 1) and discharge phase (Φ 2). In charge phase, the switches on the left-hand side close, and the switches on the right-hand side open. In the discharge phase, the inverse occurs. Figure 2 illustrates that in charge phase, both flying capacitors are charged in parallel. The load is serviced entirely by the charge stored in the output capacitor. Figure 3 demonstrates the series connection of the fly- ing capacitors in the discharge phase. The series com- bination of the flying capacitors, when connected to the output capacitor, transfers charge to the output in order to maintain output voltage regulation. In normal opera- tion, the MAX868 operates predominantly in charge phase, switching to discharge phase only as needed to maintain a regulated output. M A X 8 6 8 Regulated, Adjustable -2x Inverting Charge Pump _______________________________________________________________________________________ 5 Pin Description Active-Low Shutdown Input. Connect SHDN to GND to put the MAX868 in shutdown mode and reduce sup- ply current to 0.1µA. Connect to IN for normal operation. OUT is actively pulled to GND in shutdown. SHDN9 Feedback Input. Connect FB to a resistor divider for a regulated output voltage. Connect to IN to generate an unregulated -2 x VIN output voltage. FB10 Positive Terminal of Flying Capacitor C1C1+5 Negative Terminal of Flying Capacitor C2C2-6 Supply-Voltage Input. Input voltage range is 1.8V to 5.5V.IN7 Positive Terminal of Flying Capacitor C2C2+8 Power GroundPGND4 Negative Terminal of Flying Capacitor C1C1-3 PIN Charge-Pump OutputOUT2 Analog GroundGND1 FUNCTIONNAME VREF COUT OUT C2- C1+ C1- FB Φ1 Φ2 OSCILLATOR C2+ IN SHDN Figure 1. Functional Diagram

Page 7

M A X 8 6 8 __________________Design Procedure Setting the Output Voltage Set the output voltage using two external resistors, R1 and R2, as shown in Figure 4. Since the input bias cur- rent at FB has a 50nA maximum, large resistor values in the feedback loop do not significantly degrade accura- cy. Begin by selecting R2 in the 100kΩ to 500kΩ range, and calculate R1 using the following equation: where VOUT is the desired output voltage, and VREF is any available regulated positive voltage. When the MAX868 is powered by a regulated voltage, VIN can be used as the reference for setting the output voltage. When the MAX868 is powered by an unregulated sup- ply, such as when operating directly from a battery, use any available positive reference voltage in the system. Note that due to the MAX868’s doubling and inverting charge-pump action, the output voltage is limited to -2 x VIN. Alternatively, to configure the MAX868 as a simple, unregulated doubler-inverter (VOUT = -2 x VIN), con- nect FB to IN. In this configuration, the MAX868 runs at its maximum oscillator frequency, operating as a con- ventional, open-loop charge pump. If multiple oscillator cycles are required to regulate the output, reduce the values for R1 and R2, or parallel a small capacitor (CC) across R1 to compensate the feedback loop and ensure stability. Choose the lowest capacitor value that ensures stability; values up to 47pF are adequate for most applications. R R x V V OUT REF 1 2 | | = Regulated, Adjustable -2x Inverting Charge Pump 6 _______________________________________________________________________________________ COUT VOUT C2- C1+ C1- C2+ IN IN GND (a) (b) COUT VOUT C2- C2+ C1- C1+ Figure 2. a) In charge phase, the left-hand switches are closed and the right-hand switches are open, charging the fly- ing capacitors (C1 and C2) while the output capacitor (COUT) services the load. b) The equivalent circuit of the charge phase of operation. C2- C1+ C1- C2+ IN (a) (b) COUT VOUT COUT VOUT C2+ C2- C1+ C1- Figure 3. a) In discharge phase, the left-hand switches are open and the right-hand switches are closed, transferring energy from the flying capacitors (C1 and C2) to the output capacitor (COUT). b) The equivalent circuit of the discharge phase of operation.

Page 8

Capacitor Selection Choosing the Flying Capacitors Proper choice of the flying capacitors is dependent pri- marily upon the desired output current. For flying capaci- tors in the 0.1µF to 0.33µF range, the maximum output current can be approximated by the following equation: where fMAX is the maximum oscillator frequency (typically 450kHz), ROUT is the MAX868 open-loop output impedance (typically 70Ω ), and C1 and C2 are the flying- capacitor values. As a general rule, choose the lowest- value flying capacitors that provide the desired output current in order to minimize output voltage ripple (see the section Choosing the Output Capacitor). Surface-mount ceramic capacitors are preferred, due to their small size, low cost, and low equivalent series resistance (ESR). To ensure proper operation over the entire temperature range, choose ceramic capacitors with X7R (or equivalent) low temperature-coefficient (tempco) dielectrics. See Table 1 for a list of suggested capacitor suppliers. Choosing the Output Capacitor The output capacitor stores the charge transferred from the flying capacitors and services the load between oscillator cycles. A good general rule is to make the output capacitance at least ten times greater than that of the flying capacitors. The output voltage ripple is dependent upon the capacitance of the flying capacitor and upon the output capacitor’s capacitance and ESR. When operating in closed-loop mode (when the MAX868 is generating a regulated output voltage), use the following equation to approximate peak-to-peak output voltage ripple: where C1 and C2 are the flying capacitors, RESR is the output capacitor’s ESR, and ROUT is the MAX868’s open-loop output impedance, typically 70Ω . Choose a low-ESR output capacitor for minimum output ripple. Surface-mount ceramic capacitors are preferred for their small size, low cost, and low ESR; low-ESR tan- talum electrolytic capacitors are also acceptable. When using a ceramic output capacitor, ensure proper opera- tion over the entire temperature range by choosing a capacitor with X7R (or equivalent) low tempco dielec- tric. See Table 1 for a list of suggested capacitor sup- pliers. V 2 x V V x 1 1 4 x C C1 C2 R RRIPPLE IN OUT OUT ESR OUT | |= −( ) + + +           I 2 x V V 4 f x C1 C2 + R x 10V V V OUT(MAX) IN OUT MAX OUT IN OUT | | | | = − + +( ) M A X 8 6 8 Regulated, Adjustable -2x Inverting Charge Pump _______________________________________________________________________________________ 7 Table 1. Manufacturers of Surface-Mount, Low-ESR Capacitors Sprague TYPE Matsuo AVX Surface-Mount Tantalum MANUFACTURER 593D, 595D series 267 series TPS series PART (603) 224-1430 (714) 960-6492 (803) 626-3123 FAX (603) 224-1961 (714) 969-2491 (803) 946-0690 PHONE X7R type X7R type (714) 960-6492 (803) 626-3123 (714) 969-2491 (803) 946-0690 Matsuo Surface-Mount Ceramic AVX MAX868 INVIN VREF OPTIONAL CONNECTION *OPTIONAL FEED-FORWARD CAPACITOR VOUT OUT FB CC* R2 R1 Figure 4. Setting the Output Voltage Using Two External Resistors

Page 9

M A X 8 6 8 Regulated, Adjustable -2x Inverting Charge Pump 8 ___________________________________ __________Applications Information Low-Output-Voltage Operation Since the difference between the voltage of the series- connected flying capacitors and the output voltage must be dissipated within the device, the MAX868’s efficiency is very similar to that of a linear regulator. Estimate efficiency using the following equation: where k is a constant equal to 2 for the standard con- figuration of Figure 5 and equal to 1 for the circuit of Figure 6. This equation’s denominator is the voltage resulting from the series connection of the flying capac- itors (-2 x VIN, as shown in Figure 3b), while its numera- tor is simply the regulated output voltage. For applications in which the output voltage will not be more negative than -|VIN|, the efficiency can be doubled using the circuit of Figure 6, as compared to the circuit of Figure 5. In Figure 6, a single flying capacitor is con- nected between C2+ and C1-, with C2- and C1+ left unconnected. Furthermore, doubling the flying capaci- tor to provide the same flying capacitance as the stan- dard configuration (i.e., setting CF = C1 + C2) provides the same load-current capability as the standard con- figuration and reduces the MAX868’s open-loop output resistance by a factor of two, due to the reduction in the number of switches in the current path. Layout and Grounding Proper layout is important to obtain optimal perfor- mance. Connect GND to PGND together using the shortest trace possible, and similarly connect these pins to the ground plane. Mount all capacitors as close to the MAX868 as possible, keeping traces short to minimize parasitics. Keep all connections to the FB pin as short as possible. Specifically, locate R1 and R2 next to FB (Figures 7 and 8). Should it become neces- sary in the final layout, leave room to parallel a feed- forward capacitor across R1. η V k x V | |OUT IN = MAX868 C1+ IN PGND SHDN GND FB R2 500k R1 750k OUT 0.1µF 1µF 10µF VOUT = -7.5V VIN = 5V 0.1µF C1- C2+ C2- Figure 5. Standard Configuration for Generating an Output Voltage up to -2 x VIN MAX868 C2+ IN PGND SHDN GND FB OUT CF = 0.2µF * * 1µF 10µF VOUT = -3.3V AT 20mA VIN = 5V C2- C1+ C1- *C1+ AND C2- MUST BE LEFT UNCONNECTED. R2 500k R1 330k Figure 6. Alternative Configuration for |VOUT| ≤ VIN Chip Information TRANSISTOR COUNT: 96 SUBSTRATE CONNECTED TO IN

Page 10

M A X 8 6 8 Regulated, Adjustable -2x Inverting Charge Pump _______________________________________________________________________________________ 9 Figure 7a. Suggested Layout for Circuit of Figure 5 Figure 7b. Suggested Layout for Circuit of Figure 5 0.5" 0.5" COMPONENT PLACEMENT GUIDE PC BOARD LAYOUT

MAX868EUB+Reviews

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Ali*****man

February 11, 2020

I took the chance and used it and I worked fine for me.

Nico*****arnik

February 1, 2020

Works great with an older drive in a newer computer.have not encountered any problems, Glad somebody is making these for all the older equipment.

Xzav*****Norton

January 12, 2020

Great item and excellent seller! Would highly recommend. Thank you. Trustworthy

Cra*****Sodhi

January 8, 2020

Good! quick and convenient delivery. product tracking with good advice.

Thadd*****asquez

December 21, 2019

FAST POSTING TOP CONDITION RECORD HAVE A GREAT CHRISTMAS

Jayc*****wards

November 13, 2019

I always have good experiences in dealing with Heisener Electronics. They have the components I need in stock, their search function is great, and shipping is fast and always as promised.

Daxto*****phens

November 1, 2019

I am very happy with how Heisener do business. Will definitely buy their products in the future as I have confidence in their customer service.

Maximi*****alhoun

October 19, 2019

very pleased with item, thank you.

Ilia*****olla

September 4, 2019

arrived well within time bracket, put this firm on my suppliers list, many thanks

Nels*****ampson

August 13, 2019

Rec today in good order & condition . Thanks for speedy delivery.Regards.

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