MAX1686HEUA-T Maxim Integrated Products, MAX1686HEUA-T Datasheet
MAX1686HEUA-T
Specifications of MAX1686HEUA-T
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MAX1686HEUA-T Summary of contents
Page 1
... Input-Output Shorting Switch for 3V Cards Small External Components (Uses a 0.047µF, 0.1µF, and a 2.2µF Capacitor) Output Driven to Ground in Shutdown Mode Super-Small 8-Pin µMAX Package Soft-Start and Short-Circuit Protection Applications PART MAX1686EUA MAX1686HEUA TOP VIEW OUTPUT V OR 5V/20mA IN C OUT Features Ordering Information TEMP ...
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... OUT Operating Temperature Range + 0.3V) IN MAX1686EUA/MAX1686HEUA........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +165°C Lead Temperature (soldering, 10sec) .............................+300°C = 0.22µ 10µF (see Applications Information section to use smaller capacitors), OUT = +25° ...
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... INPUT VOLTAGE (5V MODE) 10,000 1000 100 INPUT VOLTAGE (V) OUTPUT VOLTAGE vs. INPUT VOLTAGE (3V MODE LOAD INPUT VOLTAGE (V) _______________________________________________________________________________________ Regulating Charge Pumps for SIM Cards Typical Operating Characteristics = 0.22µ 10µ 3.3V OUT IN EFFICIENCY vs. INPUT VOLTAGE (5V MODE 10mA LOAD I = 1mA 70 LOAD 100 INPUT VOLTAGE (V) OUTPUT VOLTAGE vs ...
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... Regulating Charge Pumps for SIM Cards (See Typical Operating Circuit , C = 0.47µ OUTPUT WAVEFORM (I = 1mA) LOAD V OUT (20mV/div) 25µs/div 5V MODE, AC COUPLED 0.1 F OUT START-UP WAVEFORM (3V MODE 500 ) L SHDN (5V/div) V OUT (1V/div) 0V 250 s/div SHUTDOWN WAVEFORM (3V MODE, NO LOAD) SHDN (5V/div) V OUT (1V/div) ...
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... PGND SHDN 3/5 Figure 1. Functional Diagram _______________Detailed Description The MAX1686/MAX1686H charge pumps provide two modes of operation: 3V mode or 5V mode. The devices consist of an error amplifier, a 1.23V bandgap refer- ence, an internal resistive feedback network, a 1MHz oscillator, high-current MOSFET drivers and switches, and a power-management block as shown in the Functional Diagram (Figure 1 mode (3/5 = IN), the input is connected to the output through a 2.5Ω ...
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... MAX1686H) and for a maximum of 2ms the charge pump is active, but R of the switch S2 is limited to ON 50Ω. This limits typical current surges associated with charge pumps at start-up. When soft-start is complete, V > 4.75V (5.00V for MAX1686H) or 2ms (whichever OUT occurs first), switch S2’s on-resistance is decreased to minimize losses ...
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... Regulating Charge Pumps for SIM Cards High switching frequencies and large peak currents make PC board layout an important part of design. All capacitors should be soldered close to the IC. Con- nect ground and power ground through a short, low- impedance trace. Keep the extra copper on the board and integrate it into ground as a pseudo-ground plane ...
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... Maxim reserves the right to change the circuitry and specifications without notice at any time. implied. Maxim reserves the right to change the circuitry and specifications without notice at any time _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1998 Maxim Integrated Products © ...