PART. Maxim Integrated Products 1

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1 9-79; Rev ; 9/ SC7 Inverting Charge Pumps General Description The / monolithic, CMOS chargepump voltage inverters in the ultra-small SC7 package feature a low Ω output resistance, permitting loads up to 3mA with maximum efficiency. The / are available with operating frequencies of khz and khz, respectively, allowing optimization of supply current or external component size. Small external components and micropower shutdown mode make these devices ideal for both battery-powered and board-level voltage conversion applications. Oscillator control circuitry and four power-mosfet switches are included on-chip. Applications include generating a negative supply from a +V or +3.3V logic supply to power analog circuitry. Both versions come in a -pin SC7 package that is % smaller than a SOT3. Applications Negative Supply from +V or +3.3V Logic Supplies Small LCD Panels GaAsFET Bias Supplies Handy-Terminals, PDAs Battery-Operated Equipment Features 3mA Output Current Low Ω Output Resistance 8µA Supply Current () Requires Only Two.8µF Capacitors () +.V to +.V Input Voltage Range.µA Logic-Controlled Shutdown Two Switching Frequencies khz () khz () Slew-Rate Limited to Reduce EMI Ultra-Small -Pin SC7 Package PART Ordering Information TEMP. RANGE P - PA C K A G E TOP MARK EXT - C to + 8 C SC7 AAL EXT - C to + 8 C SC7 AAM / Typical Operating Circuit Pin Configuration.8µF TOP VIEW PUT.V TO.V + - OUT NEGATIVE OUTPUT - V 3mA.8µF OUT + GND - ON OFF GND 3 SC7- Maxim Integrated Products For free samples and the latest literature, visit or phone For small orders, phone

2 SC7 Inverting Charge Pumps / ABSOLUTE MAXIMUM RATGS to GND...-.3V to +V +, to GND...-.3V to (V +.3V) - to GND...( -.3V) to +.3V OUT to GND...+.3V to -V OUT Short-Circuit to GND... minute ELECTRICAL CHARACTERISTICS Continuous Power Dissipation (T A = +7 C) -Pin SC7 (derate 3.mW/ C above +7 C)...mW Operating Temperature Range...- C to +8 C Junction Temperature...+ C Storage Temperature Range...- C to + 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. (Circuit of Figure, capacitors from Table,, =, T A = - C to +8 C, unless otherwise noted. Typical values are at T A = + C.) (Note ) PARAMETER CONDITIONS M TYP MAX UNITS Supply Voltage Range.. V Quiescent Supply Current Shutdown Supply Current Oscillator Frequency = GND T A = + C 7 3 T A = - C to +8 C T A = + C 3 T A = - C to +8 C 3 T A = + C.. T A = +8 C. T A = + C 3 8 T A = - C to +8 C 78 T A = + C 3 7 T A = - C to +8 C 3 Voltage Conversion Efficiency I OUT = % Output Resistance (Note ) I OUT = ma T A = + C 3 T A = - C to +8 C Output Current Continuous, long-term 3 ma RMS Input Logic High +.V V +.V.7 V V Input Logic Low +.V V +.V.3 V V Bias Current Wake-Up Time From Shutdown = GND or I OUT = ma T A = + C - T A = +8 C µa µa khz Ω na µs Note : All devices are % production tested at T A = + C. All temperature limits are guaranteed by design. Note : Output resistance is guaranteed with capacitor ESR of.3ω or less.

3 SC7 Inverting Charge Pumps Typical Operating Characteristics (Circuit of Figure, capacitors from Table,, =, T A = + C, unless otherwise noted.) OUTPUT VOLTAGE (V) OUTPUT VOLTAGE vs. LOAD CURRENT 3 LOAD CURRENT (ma) /3 toc OUTPUT VOLTAGE (V) OUTPUT VOLTAGE vs. LOAD CURRENT 3 LOAD CURRENT (ma) /3 toc EFFICIENCY (%) EFFICIENCY vs. LOAD CURRENT V = +.V 3 LOAD CURRENT (ma) /3 toc3 / EFFICIENCY (%) EFFICIENCY vs. LOAD CURRENT V = +.V /3 toc OUTPUT RESISTANCE (Ω) OUTPUT RESISTANCE vs. PUT VOLTAGE /3 toc SUPPLY CURRENT (µa) 8 8 NO-LOAD SUPPLY CURRENT vs. SUPPLY VOLTAGE /3 toc 3 LOAD CURRENT (ma) PUT VOLTAGE (V) 3 SUPPLY VOLTAGE (V) SUPPLY CURRENT (na) SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE /3 toc7 OUTPUT RESISTANCE (Ω) 8 8 OUTPUT RESISTANCE vs. TEMPERATURE V = +.V /3 toc8 OUTPUT RESISTANCE (Ω) 8 8 OUTPUT RESISTANCE vs. TEMPERATURE V = +.V /3 toc

4 SC7 Inverting Charge Pumps / Typical Operating Characteristics (continued) (Circuit of Figure, capacitors from Table,, =, T A = + C, unless otherwise noted.) FREQUENCY (khz) CHARGE-PUMP FREQUENCY vs. TEMPERATURE /3 toc FREQUENCY (khz) 3 CHARGE-PUMP FREQUENCY vs. TEMPERATURE /3 toc FREQUENCY (khz) CHARGE-PUMP FREQUENCY vs. PUT VOLTAGE PUT VOLTAGE (V) /3 toc OUTPUT VOLTAGE (V) AND OUTPUT VOLTAGE vs. PUT VOLTAGE I LOAD = ma /3 toc3 OUTPUT VOLTAGE RIPPLE (mv) 3 3 OUTPUT VOLTAGE RIPPLE vs. CAPACITANCE = I LOAD = ma /3 toc mv/div OUTPUT NOISE AND RIPPLE = =.7µF /3 toc PUT VOLTAGE (V) CAPACITANCE (µf) µs/div I LOAD = ma, AC-COUPLED OUTPUT NOISE AND RIPPLE STARTUP FROM SHUTDOWN /3 toc7 STARTUP FROM SHUTDOWN /3 toc8 = = µf /3 toc mv/div V/div V/div µs/div I LOAD = ma, AC-COUPLED µs/div µs/div

5 SC7 Inverting Charge Pumps P Detailed Description The / charge pumps invert the voltage applied to their input. For highest performance use low equivalent series resistance (ESR) capacitors (e.g., ceramic). During the first half-cycle, switches S and S open, switches S and S3 close, and capacitor charges to the voltage at (Figure ). During the second halfcycle, S and S3 open, S and S close, and is level shifted downward by V volts. This connects in parallel with the reservoir capacitor. If the voltage across is smaller than the voltage across, charge flows from to until the voltage across reaches -V. The actual voltage at the output is more positive than -V since switches S S have resistance and the load drains charge from. Efficiency Considerations The efficiency of the / is dominated by their quiescent supply current (I Q ) at low output current and by their output impedance (R OUT ) at higher output current; it is given by: I I x R η OUT OUT OUT IOUT + IQ V where the output impedance is roughly approximated by: ROUT + RSW + ESR + ESR f OSC x ( ) Pin Description OUT Inverting Charge-Pump Output GND Ground 3 NAME - + FUNCTION Shutdown Input. Drive this pin high for normal operation; drive it low for shutdown mode. Power-Supply Voltage Input. Input range is +.V to +.V. Negative Terminal of the Flying Capacitor Positive Terminal of the Flying Capacitor The first term is the effective resistance of an ideal switched-capacitor circuit (Figures 3a and 3b), and R SW is the sum of the charge pump s internal switch TE: ( PUT.V TO.V + - NEGATIVE OUT OUTPUT C3 - V R L ON 3 OFF GND Figure. Typical Application Circuit resistances (typically Ω at ). The typical output impedance is more accurately determined from the Typical Operating Characteristics. Shutdown The / have a logic-controlled shutdown input. Driving low places the devices in a low-power shutdown mode. The charge-pump switching halts, supply current is reduced to na. Driving high will restart the charge pump. The switching frequency and capacitor values determine how soon the device will reach 9% of the input voltage. Applications Information Capacitor Selection The charge-pump output resistance is a function of the ESR of and. To maintain the lowest output resistance, use capacitors with low ESR. (See Table for a list of recommended manufacturers.) Tables and 3 suggest capacitor values for minimizing output resistance or capacitor size. Flying Capacitor () Increasing the flying capacitor s value reduces the output resistance. Above a certain point, increasing s capacitance has negligible effect because the output resistance is then dominated by internal switch resistance and capacitor ESR. Output Capacitor () Increasing the output capacitor s value reduces the output ripple voltage. Decreasing its ESR reduces both output resistance and ripple. Lower capacitance values can be used with light loads if higher output ripple can be tolerated. Use the following equation to calculate the peak-to-peak ripple: /

6 SC7 Inverting Charge Pumps / S S3 Figure. Ideal Voltage Inverter V+ f OSC I V = OUT RIPPLE + (f ) I OUT ESR OSC Input Bypass Capacitor (C3) If necessary, bypass the incoming supply to reduce its AC impedance and the impact of the / s switching noise. A bypass capacitor with a value equal to that of is recommended. Voltage Inverter The most common application for these devices is a charge-pump voltage inverter (Figure ). This application requires only two external components capacitors and plus a bypass capacitor, if necessary. Refer to the Capacitor Selection section for suggested capacitor types. Cascading Devices Two devices can be cascaded to produce an even larger negative voltage (Figure ). The unloaded output voltage is normally - V, but this is reduced slightly by the output resistance of the first device multiplied by the quiescent current of the second. When cascading more than two devices, the output resistance rises significantly. For applications requiring larger negative voltages, see the MAX8 and MAX88 data sheets. S S Figure 3a. Switched-Capacitor Model R L = -(V ) V+ R EQUIV R EQUIV = f OSC Figure 3b. Equivalent Circuit VOUT Paralleling Devices Paralleling multiple /s reduces the output resistance. Each device requires its own pump capacitor (), but the reservoir capacitor () serves all devices (Figure ). Increase s value by a factor of n, where n is the number of parallel devices. Figure shows the equation for calculating output resistance. Combined Doubler/Inverter In the circuit of Figure, capacitors and form the inverter, while C3 and C form the doubler. and C3 are the pump capacitors; and C are the reservoir capacitors. Because both the inverter and doubler use part of the charge-pump circuit, loading either output causes both outputs to decline toward GND. Make sure the sum of the currents drawn from the two outputs does not exceed 3mA. Heavy Load Connected to a Positive Supply Under heavy loads, where a higher supply is sourcing current into OUT, the OUT supply must not be pulled above ground. Applications that sink heavy current into OUT require a Schottky diode (N87) between GND and OUT, with the anode connected to OUT (Figure 7). 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. R L

7 SC7 Inverting Charge Pumps Table. Low-ESR Capacitor Manufacturers PRODUCTION METHOD Surface-Mount Tantalum Surface-Mount Ceramic Table. Capacitor Selection to Minimize Output Resistance PART FREQUENCY (khz) MANUFACTURER AVX Matsuo Sprague AVX Matsuo CAPACITOR (µf) TYPICAL R OUT (Ω).7 SERIES TPS series 7 series 93D, 9D series X7R X7R Table 3. Capacitor Selection to Minimize Capacitor Size PART PHONE FREQUENCY (khz) CAPACITOR (µf) FAX TYPICAL R OUT (Ω) / +V 3 3 = -nv 3 +V = -V C3 D D D, D = N8 C = (V ) - (V FD ) - (V FD ) Figure. Cascading /s to Increase Output Voltage Figure. Combined Doubler and Inverter +V GND V+ OUT R L R OUT = R OUT OF SGLE DEVICE NUMBER OF DEVICES 3 3 = -V Figure. Paralleling /s to Reduce Output Resistance Figure 7. Heavy Load Connected to a Positive Supply TRANSISTOR COUNT: Chip Information 7

8 SC7 Inverting Charge Pumps / Package Information SC7, L.EPS 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. 8 Maxim Integrated Products, San Gabriel Drive, Sunnyvale, CA 98 (8) Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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