19-0478; Rev 0; 3/96 Dual-Output Charge Pump with Shutdown The MAX864 CMOS, charge-pump, DC-DC voltage converter produces a positive and a negative output from a single positive input, and requires only four capacitors. The charge pump first doubles the input voltage, then inverts the doubled voltage. The input voltage ranges from +1.75V to +6.0V. The internal oscillator can be pin-programmed from 7kHz to 185kHz, allowing the quiescent current, capacitor size, and switching frequency to be optimized. The 55Ω output impedance permits useful output currents up to 20mA. The MAX864 also has a 1µA logic-controlled shutdown. The MAX864 comes in a 16-pin QSOP package that uses the same board area as a standard 8-pin SOIC. For more space-sensitive applications, the MAX865 is available in an 8-pin µMAX package, which uses half the board area of the MAX864. ________________________Applications Low-Voltage GaAsFET Bias in Wireless Handsets VCO and GaAsFET Supply ____________________________Features ♦ Requires Only Four Capacitors ♦ Dual Outputs (Positive and Negative) ♦ Low Input Voltages: +1.75V to +6.0V ♦ 1µA Logic-Controlled Shutdown ♦ Selectable Frequencies Allow Optimization of Capacitor Size and Supply Current ______________Ordering Information PART MAX864C/D MAX864EEE TEMP. RANGE 0°C to +70°C -40°C to +85°C PIN-PACKAGE Dice* 16 QSOP * Contact factory for dice specifications. Split Supply from 2 to 4 Ni Cells or 1 Li+ Cell Low-Cost Split Supply for Low-Voltage Data-Acquisition Systems Split Supply for Analog Circuitry LCD Panels __________Typical Operating Circuit __________________Pin Configuration VIN (+1.75V TO +6.0V) TOP VIEW C1- 1 16 C1+ C2+ 2 15 V+ GND 3 14 N.C. C2- 4 MAX864 V- 5 13 N.C. IN 11 GND FC1 7 10 N.C. FC0 8 9 +2VIN V- -2VIN C1+ C1- MAX864 C2+ 12 IN SHDN 6 V+ C2FC0 FC1 SHDN GND N.C. VIN VIN VIN QSOP ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 MAX864 _______________General Description MAX864 Dual-Output Charge Pump with Shutdown ABSOLUTE MAXIMUM RATINGS V+ to GND ..............................................................-0.3V to +12V SHDN, FC0, FC1 to GND .............................-0.3V to (V+ + 0.3V) IN to GND ..............................................................-0.3V to +6.2V V- to GND ...............................................................+0.3V to -12V V- Output Current .............................................................100mA V- Short Circuit to GND .................................................Indefinite Operating Temperature Range MAX864EEE......................................................-40°C to +85°C Continuous Power Dissipation (TA = +70°C) QSOP (derate 8.70mW/°C above +70°C) .....................696mW 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 (Note 1) (VIN = 5V, SHDN = VIN, circuit of Figure 1, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL MIN TYP TA = +25°C 1.75 1.25 TA = TMIN to TMAX 2.00 MAX UNITS SUPPLY Minimum Start-Up Voltage RLOAD = 10kΩ Maximum Supply Voltage RLOAD = 10kΩ Supply Current Shutdown Current Oscillator Frequency V 6.0 FC1 = FC0 = GND, f = 7kHz 0.6 1.0 FC1 = GND, FC0 = IN, f = 33kHz 2.4 3.65 FC1 = IN, FC0 = GND, f = 100kHz 7 11 FC1 = FC0 = IN, f = 185kHz 12 18 FC1 = FC0 = IN or GND, SHDN = GND V mA 0.1 1 FC1 = FC0 = GND 5 7 10 µA FC1 = GND, FC0 = IN 24 33 48 FC1 = IN, FC0 = GND 70 100 140 FC1 = FC0 = IN 130 185 260 2.2 1.0 V 1 µA kHz INPUTS AND OUTPUTS Logic Input Low Voltage SHDN, FC0, FC1 Logic Input High Voltage SHDN, FC0, FC1 3.5 Logic Input Bias Current SHDN, FC0 = FC1 = GND or IN -1 V+ to IN Shutdown Resistance IV+ = 10mA 22 100 Ω V- to GND Shutdown Resistance IV- = 10mA 6 50 Ω 55 75 Output Resistance (Note 1) IV+ = 10mA, IV- = 0mA V+ = 10V, IV- = 10mA (forced) Voltage Conversion Efficiency TA = +25°C 2.8 TA = TMIN to TMAX V 100 TA = +25°C 34 TA = TMIN to TMAX 50 Ω 60 V+, RL = ∞ 95 99 V-, RL = ∞ 95 99 % Note 1: Measured using the capacitor values in Table 1. Capacitor ESR contributes approximately 10% of the output impedance [ESR + 1 / (pump frequency x capacitance)]. 2 _______________________________________________________________________________________ Dual-Output Charge Pump with Shutdown EFFICIENCY vs. OUTPUT CURRENT @ 33kHz PUMP FREQUENCY V+ 70 V- VIN = 3.3V V- 50 40 30 C1–C4 = 33µF FC1 = 0, FC0 = 0 20 50 40 30 C1–C4 = 6.8µF FC1 = 0, FC0 = 1 0 20 15 25 35 30 5 10 15 20 25 30 OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) EFFICIENCY vs. OUTPUT CURRENT @ 185kHz PUMP FREQUENCY OUTPUT RESISTANCE vs. SUPPLY VOLTAGE V+ V+ 70 60 VIN = 5.0V V- 50 V- 40 30 C1–C4 = 1µF FC1 = 1, FC0 = 1 20 160 0 10 20 15 25 30 FC1 = 1, FC0 = 1 (185kHz @ 5V) 140 ROUT100 ROUT+ 80 15 20 25 30 MAX864-03 35 140 V-, VIN = 3.0V 125 V-, VIN = 4.5V 110 V+, VIN = 3.0V 95 80 65 V+, VIN = 4.5V 50 35 1.0 2.0 3.0 4.0 5.0 -55 -35 -15 6.0 5 25 45 65 85 105 125 OUTPUT CURRENT vs. PUMP CAPACITANCE (VIN = 3.15V, V+ + V- = 10V) MAX864-07 V- LOADED 4 BOTH V+ AND V- LOADED EQUALLY -2 C1–C4 = 1µF VIN = 4.75V FC1 = 1 FC0 = 1 (185kHz) -4 V- LOADED -6 -8 V+ LOADED -10 4.5 f = 33kHz 4.0 3.5 f = 185kHz 3.0 f = 100kHz f = 7kHz 2.5 2.0 1.5 1.0 0.5 C1 = C2 = C3 = C4 0 10 15 20 25 30 OUTPUT CURRENT (mA) 35 40 OUTPUT CURRENT FROM V+ TO V- (mA) OUTPUT CURRENT vs. PUMP CAPACITANCE (VIN = 1.9V, V+ + V- = 6V) MAX864-08 OUTPUT VOLTAGE vs. OUTPUT CURRENT 6 5 10 TEMPERATURE (°C) V+ LOADED 0 5 SUPPLY VOLTAGE (V) 8 0 20 OUTPUT CURRENT (mA) 10 2 C1–C4 = 2.2µF FC1 = 0, FC0 = 0 OUTPUT RESISTANCE vs. TEMPERATURE 120 35 OUTPUT CURRENT FROM V+ TO V- (mA) 5 30 OUTPUT CURRENT (mA) 40 0 40 0 60 10 V- V50 35 OUTPUT RESISTANCE (Ω) VIN = 3.3V VIN = 5.0V 0 0 MAX864-05 10 OUTPUT RESISTANCE (Ω) 80 5 MAX864-04 0 V+ 60 10 10 0 EFFICIENCY V+, V- (%) V- 20 10 OUTPUT VOLTAGE (V) V- 60 V+ V+ V+ VIN = 5.0V VIN = 3.3V 70 9 MAX864-09 60 70 80 MAX864-06 V+ 80 EFFICIENCY V+, V- (%) EFFICIENCY V+, V- (%) VIN = 3.3V 80 EFFICIENCY V+, V- (%) VIN = 5.0V 90 90 MAX864-01 100 EFFICIENCY vs. OUTPUT CURRENT @ 100kHz PUMP FREQUENCY MAX864-02 EFFICIENCY vs. OUTPUT CURRENT @ 7kHz PUMP FREQUENCY 8 f = 100kHz 7 f = 33kHz 6 f = 185kHz 5 f = 7kHz 4 3 2 1 C1 = C2 = C3 = C4 0 0 5 10 15 20 25 30 35 40 45 50 PUMP CAPACITANCE (µF) 0 5 10 15 20 25 30 35 40 45 50 PUMP CAPACITANCE (µF) _______________________________________________________________________________________ 3 MAX864 __________________________________________Typical Operating Characteristics (VIN = 5.0V, capacitor values in Table 1, TA = +25°C, unless otherwise noted.) ____________________________Typical Operating Characteristics (continued) (VIN = 5.0V, capacitor values in Table 1, TA = +25°C, unless otherwise noted.) OUTPUT VOLTAGE RIPPLE vs. PUMP CAPACITANCE (VIN = 1.9V, V+ + V- = 6V) 10 100kHz 185kHz 8 7kHz 6 4 2 C1 = C2 = C3 = C4 350 OUTPUT RIPPLE IS MEASURED FOR THE LOAD CURRENT INDICATED IN THE "OUTPUT CURRENT vs. PUMP CAPACITANCE" GRAPH AT VIN = 1.9V. 300 250 200 150 33kHz 100kHz 100 5 185kHz 50 185kHz 33kHz 100 10 15 20 25 30 35 40 45 50 0 5 10 15 20 25 30 35 40 45 50 OUTPUT VOLTAGE RIPPLE vs. PUMP CAPACITANCE (VIN = 4.75V, V+ + V- = 16V) SHUTDOWN SUPPLY CURRENT vs. SUPPLY VOLTAGE SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE 300 200 5 33kHz 100kHz 185kHz 100 500 400 300 200 100 3.0 MAX864-15 MAX864-14 600 SHUTDOWN SUPPLY CURRENT (µA) 400 100kHz 200 PUMP CAPACITANCE (µF) SHUTDOWN SUPPLY CURRENT (nA) 500 300 PUMP CAPACITANCE (µF) C1 = C2 = C3 = C4 OUTPUT RIPPLE IS MEASURED FOR THE LOAD CURRENT INDICATED IN THE "OUTPUT CURRENT vs. PUMP CAPACITANCE" GRAPH AT VIN = 4.75V. 7kHz 600 400 PUMP CAPACITANCE (µF) 800 700 C1 = C2 = C3 = C4 OUTPUT RIPPLE IS MEASURED FOR THE LOAD CURRENT INDICATED IN THE "OUTPUT CURRENT vs. PUMP CAPACITANCE" 7kHz GRAPH AT VIN = 3.15V. 500 0 0 10 15 20 25 30 35 40 45 50 MAX864-13 0 2.5 2.0 1.5 1.0 VIN = 5.0V 0.5 VIN = 3.3V 0 0 5 10 15 20 25 30 35 40 45 50 1.0 2.0 3.0 4.0 5.0 -55 -35 -15 6.0 5 25 45 65 PUMP CAPACITANCE (µF) SUPPLY VOLTAGE (V) TEMPERATURE (°C) SUPPLY CURRENT vs. TEMPERATURE (VIN = 3.3V) SUPPLY CURRENT vs. TEMPERATURE (VIN = 5V) PUMP FREQUENCY vs. TEMPERATURE 6 12 SUPPLY CURRENT (mA) FC1 = 1, FC0 = 1 5 4 FC1 = 1, FC0 = 0 3 2 FC1 = 1, FC0 = 1 10 8 FC1 = 1, FC0 = 0 6 4 FC1 = 0, FC0 = 1 1 2 FC1 = 0, FC0 = 0 0 5 25 45 65 TEMPERATURE (°C) 85 105 125 85 105 125 FC1 = 1, FC0 = 1 160 140 120 FC1 = 1, FC0 = 0 100 80 60 FC1 = 0, FC0 = 1 40 FC1 = 0, FC0 = 1 FC1 = 0, FC0 = 0 20 FC1 = 0, FC0 = 0 0 -55 -35 -15 200 180 PUMP FREQUENCY (kHz) 14 MAX864-16 7 MAX864-17 0 MAX864-18 0 4 7kHz 600 0 0 OUTPUT VOLTAGE RIPPLE (mVp-p) C1 = C2 = C3 = C4 MAX864-12 400 OUTPUT VOLTAGE RIPPLE (mVp-p) 12 OUTPUT VOLTAGE RIPPLE vs. PUMP CAPACITANCE (VIN = 3.15V, V+ + V- = 10V) MAX864-11 33kHz OUTPUT VOLTAGE RIPPLE (mVp-p) 14 MAX864-10 OUTPUT CURRENT FROM V+ TO V- (mA) OUTPUT CURRENT vs. PUMP CAPACITANCE (VIN = 4.75V, V+ + V- = 16V) SUPPLY CURRENT (mA) MAX864 Dual-Output Charge Pump with Shutdown 0 -55 -35 -15 5 25 45 65 TEMPERATURE (°C) 85 105 125 -55 -35 -15 5 25 45 65 TEMPERATURE (°C) _______________________________________________________________________________________ 85 105 125 Dual-Output Charge Pump with Shutdown MAX864-19 TIME TO EXIT SHUTDOWN +5V 0V FC0 = FC1 = IN (185kHz), C1–C4 = 1µF +10V FC0 = FC1 = GND (7kHz), C1–C4 = 33µF 0V -10V 1ms/div _____________________Pin Description PIN NAME FUNCTION 1 C1- Negative Terminal of the Flying Boost Capacitor 2 C2+ Positive Terminal of the Flying Inverting Capacitor 3, 11 GND Ground (connect pins 3 and 11 together) 4 C2- 5 V- Output of the Inverting Charge Pump SHDN Active-Low Shutdown Input. With SHDN low, the part is in shutdown mode and its supply current is less than 1µA. In shutdown mode, V+ connects to IN through a 22Ω switch, and V- connects to GND through a 6Ω switch. 6 VCC IN C1 Negative Terminal of the Flying Inverting Capacitor 7 FC1 Frequency Select, MSB (see Table 1) 8 FC0 Frequency Select, LSB (see Table 1) 9, 10, 13, 14 N.C. No Connect—no internal connection. Connect these to ground to improve thermal dissipation. 12 IN Positive Power-Supply Input 15 V+ Output of the Boost Charge Pump 16 C1+ Positive Terminal of the Flying Boost Capacitor C2 +5V 1 C12 C2+ 3 GND 4 C25 V6 SHDN 7 FC1 8 FC0 MAX864 C1+ 16 15 V+ N.C. 14 N.C. 13 V+ OUT C3 IL+ IN 12 11 GND 10 N.C. 9 N.C. RL+ RL- C4 IL- V- OUT SEE TABLE 1 FOR CAPACITOR VALUES. Figure 1. Test Circuit _______________________________________________________________________________________ 5 MAX864 ____________________________Typical Operating Characteristics (continued) (VIN = 5.0V, capacitor values in Table 1, TA = +25°C, unless otherwise noted.) MAX864 Dual-Output Charge Pump with Shutdown _______________Detailed Description Charge-Pump Frequency and Capacitor Selection The MAX864 requires only four external capacitors to implement a voltage doubler/inverter. These may be ceramic or polarized capacitors (electrolytic or tantalum) with values ranging from 0.47µF to 100µF. Figure 2a illustrates the ideal operation of the positive voltage doubler. The on-chip oscillator generates a 50% duty-cycle clock signal. During the first half cycle, switches S2 and S4 open, switches S1 and S3 close, and capacitor C1 charges to the input voltage (V IN). During the second half cycle, switches S1 and S3 open, switches S2 and S4 close, and capacitor C1 is level shifted upward by V IN volts. Assuming ideal switches and no load on C3, charge transfers into C3 from C1 such that the voltage on C3 will be 2VIN , generating the positive supply output (V+). Figure 2b illustrates the ideal operation of the negative converter. The switches of the negative converter are out of phase from the positive converter. During the second half cycle, switches S6 and S8 open, and switches S5 and S7 close, charging C2 from V+ (pumped up to 2VIN by the positive charge pump) to GND. In the first half of the clock cycle, switches S5 and S7 open, switches S6 and S8 close, and the charge on capacitor C2 transfers to C4, generating the negative supply. The eight switches are CMOS power MOSFETs. Switches S1, S2, S4, and S5 are P-channel devices, while switches S3, S6, S7, and S8 are N-channel devices. a) The MAX864 offers four different charge-pump frequencies. To select a desired frequency, define pins FC0 and FC1 as shown in Table 1. Lower charge-pump frequencies produce lower average supply currents, while higher charge-pump frequencies require smaller capacitors. Table 1 also lists the recommended charge-pump capacitor values for each pump frequency. Using values larger than those recommended will have little effect on the output current. Using values smaller than those recommended will reduce the available output current and increase the output ripple. To cut the output ripple in half, double the values of C3 and C4. To maintain the lowest output resistance, use capacitors with low effective series resistance (ESR). At each switching frequency, the charge-pump output resistance is a function of C1, C2, C3, and C4’s ESR. Minimizing the charge-pump capacitors’ ESR minimizes output resistance. Use ceramic capacitors for best results. Table 1. Frequency Selection FREQUENCY (kHz) CAPACITORS C1–C4 (µF) FC1 FC0 0 0 7 33 0 1 33 6.8 1 0 100 2.2 1 1 185 1 b) V+ S1 C1+ V+ S2 S5 C2+ S6 GND IN C3 C1 IL+ RL+ C2 IL- RL- C4 S3 S4 S7 IN GND C1- S8 V- GND C2- Figure 2. Idealized Voltage Quadrupler: a) Positive Charge Pump; b) Negative Charge Pump 6 _______________________________________________________________________________________ Dual-Output Charge Pump with Shutdown Shutdown The MAX864 features a shutdown mode that reduces the maximum supply current to 1µA over temperature. The SHDN pin is an active-low TTL logic-level input. If the shutdown feature is unused, connect SHDN to IN. In shutdown mode, V+ connects to IN through a 22Ω switch and V- connects to GND through a 6Ω switch. VDROOP- = I V - x RS The droop of the positive supply (V DROOP+ ) is the product of the current draw from the positive supply (ILOAD+) and the source resistance of the positive converter (RS+), where ILOAD+ is the combination of IVand the external load on V+ (IV+): ( ) VDROOP+ = ILOAD+ x RS+ = I V+ + I V - x RS+ Determine V+ and V- as follows: V+ = 2VIN - VDROOP+ V - = (V+ - VDROOP ) = -(2VIN - VDROOP+ - VDROOP- ) The output resistances for the positive and negative charge pumps are tested and specified separately. The positive charge pump is tested with V- unloaded. The negative charge pump is tested with V+ supplied from an external source, isolating the negative charge pump. Current draw from either V+ or V- is supplied by the reservoir capacitor alone during one half cycle of the clock. Calculate the resulting ripple voltage on either output as follows: VRIPPLE = 1 2 ILOAD (1 / fPUMP ) (1 / CRESERVOIR ) where ILOAD is the load on either V+ or V-. For example, with an fPUMP of 33kHz and 6.8µF reservoir capacitors, the ripple is 26mV when I LOAD is 12mA. Remember that, in most applications, the total load on V+ is the V+ load current (IV+) and the current taken by the negative charge pump (IV-). _________Efficiency Considerations Theoretically, a charge-pump voltage multiplier can approach 100% efficiency under the following conditions: • The charge-pump switches have virtually no offset, and extremely low on-resistance. • The drive circuitry consumes minimal power. • The impedances of the reservoir and pump capacitors are negligible. For the MAX864, the energy loss per clock cycle is the sum of the energy loss in the positive and negative converters, as follows: LOSSCYCLE = LOSSPOS + LOSSNEG 1 2 = C1 V + − 2 V + VIN 2 1 2 2 + C2 V + − V − 2 where V+ and V- are the actual measured output voltages. The average power loss is simply: ( ) ( ) ( )( ) ( ) Resulting in an efficiency of: PLOSS = LOSSCYCLE x fPUMP ( η = Total Output Power / Total Output Power − PLOSS ) There will be a substantial voltage difference between (V+ - VIN) and VIN for the positive pump, and between V+ and V- if the impedances of the pump capacitors (C1 and C2) are large with respect to their respective output loads. Larger reservoir capacitor (C3 and C4) values will reduce output ripple. Larger values of both pump and reservoir capacitors will improve efficiency. _______________________________________________________________________________________ 7 MAX864 Charge-Pump Output The MAX864 is not a voltage regulator: the output source resistance of either charge pump is approximately 55Ω at room temperature (with VIN = 5V); and V+ and V- approach +10V and -10V, respectively, when lightly loaded. Both V+ and V- will droop toward GND as the current draw from either V+ or V- increases, since Vis derived from V+. Treating each converter separately, the droop of the negative supply (VDROOP-) is the product of the current draw from V- (IV-) and the source resistance of the negative converter (RS-): MAX864 Dual-Output Charge Pump with Shutdown __________Applications Information Positive and Negative Converter The most common application of the MAX864 is as a dual charge-pump voltage converter that provides positive and negative outputs of two times a positive input voltage for biasing analog circuitry (Figure 3). Select a charge-pump frequency high enough so it does not interfere with other circuitry, but low enough to maintain low supply current. See Table 1 for the correct device configuration. VIN (+1.75V TO +6.0V) C1 1 C12 C2+ 3 GND 4 C2- C2 IN SEE TABLE 1 Paralleling Devices Paralleling multiple MAX864s reduces the output resistance of both the positive and negative converters (Figure 4). The effective output resistance is the output resistance of one device divided by the total number of devices. Separate C1 and C2 charge-pump capacitors are required for each MAX864, but the reservoir capacitors C3 and C4 can be shared. 5 V6 SHDN 7 FC1 8 FC0 MAX864 C1+ 16 15 V+ 14 N.C. 13 N.C. IN 12 11 GND 10 N.C. 9 N.C. +2 x VIN C3 C4 -2 x VIN Figure 3. Positive and Negative Converter 8 _______________________________________________________________________________________ Dual-Output Charge Pump with Shutdown MAX864 VIN 3.3µF 3.3µF 1 2 3.3µF 3 4 C1- V+ C2+ MAX864 C1+ IN C2V- GND 8 1 7 2 6 5 3.3µF 3 4 C1C2+ MAX864 C2V- V+ C1+ IN GND 8 V+ OUT 7 3.3µF 6 VIN 5 GND 3.3µF V- OUT Figure 4. Paralleling Two MAX864s Heavy Output Current Loads When under heavy loads, where V+ is sourcing current into V- (i.e., load current flows from V+ to V-, rather than from supply to ground), do not allow the V- supply to pull above ground. In applications where large currents flow from V+ to V-, use a Schottky diode (1N5817) between GND and V-, with the anode connected to GND (Figure 5). GND 11 Layout and Grounding Good layout is important, primarily for good noise performance. To ensure good layout, mount all components as close together as possible, keep traces short to minimize parasitic inductance and capacitance, and use a ground plane. Connecting all N.C. pins to a ground plane improves thermal dissipation. MAX864 V- 5 Figure 5. High V- Load Circuit _______________________________________________________________________________________ 9 Dual-Output Charge Pump with Shutdown MAX864 ___________________Chip Topography C1- C2+ C1+ V+ GND 0.120" (3.05mm) C2VIN GND SHDN FC1 FC0 0.080" (2.03mm) TRANSISTOR COUNT: 143 SUBSTRATE CONNECTED TO V+ 10 ______________________________________________________________________________________ Dual-Output Charge Pump with Shutdown DIM A A1 A2 B C D E e H h L N S α D A e A1 B S E INCHES MILLIMETERS MAX MIN MIN MAX 0.068 0.061 1.55 1.73 0.004 0.0098 0.127 0.25 0.061 0.055 1.40 1.55 0.012 0.008 0.20 0.31 0.0075 0.0098 0.19 0.25 SEE VARIATIONS 0.157 0.150 3.81 3.99 0.25 BSC 0.635 BSC 0.244 0.230 5.84 6.20 0.016 0.010 0.25 0.41 0.035 0.016 0.41 0.89 SEE VARIATIONS SEE VARIATIONS 8° 0° 0° 8° H h x 45° α A2 N E C DIM PINS D S D S D S D S 16 16 20 20 24 24 28 28 INCHES MILLIMETERS MIN MAX MIN MAX 0.189 0.196 4.80 4.98 0.0020 0.0070 0.05 0.18 0.337 0.344 8.56 8.74 0.0500 0.0550 1.27 1.40 0.337 0.344 8.56 8.74 0.0250 0.0300 0.64 0.76 0.386 0.393 9.80 9.98 0.0250 0.0300 0.64 0.76 21-0055A QSOP QUARTER SMALL-OUTLINE PACKAGE L ______________________________________________________________________________________ 11 MAX864 ________________________________________________________Package Information MAX864 Dual-Output Charge Pump with Shutdown Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 1996 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.