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MAX8621Y Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX8621Y Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 18 page General Description The MAX8621Y/MAX8621Z power-management inte- grated circuits (PMICs) are designed for a variety of portable devices including cellular handsets. These PMICs include two high-efficiency step-down DC-DC converters, four low-dropout linear regulators (LDOs) with pin-programmable capability, one open-drain dri- ver, a 60ms (typ) reset timer, and power-on/off control logic. These devices offer high efficiency with a no-load supply current of 160µA, and their small thin QFN 4mm x 4mm package makes them ideal for portable devices. The step-down DC-DC converters utilize a proprietary 4MHz hysteretic-PWM control scheme that allows for ultra-small external components. Internal synchronous rectification improves efficiency and eliminates the external Schottky diode that is required in conventional step-down converters. The output voltage is adjustable from 0.6V to 3.3V. The output current is guaranteed up to 500mA. The four LDOs offer low 45µVRMS output noise and low dropout of only 100mV at 100mA. OUT1 and OUT2 deliver 300mA (min) of continuous output current. OUT3 and OUT4 deliver 150mA (min) of continuous output current. The output voltages are pin selectable by SEL1 and SEL2 for flexibility. The MAX8621Y/ MAX8621Z offer different sets of LDO output voltages. A microprocessor reset output ( RESET) monitors OUT1 and warns the system of impending power loss, allow- ing safe shutdown. RESET asserts during power-up, power-down, shutdown, and fault conditions where VOUT1 is below its regulation voltage. A 200mA driver output is provided to control LED back- lighting or provide an open-drain connection for resis- tors such as in feedback networks. Applications Cellular Handsets Smart Phones, PDAs Digital Cameras MP3 Players Wireless LAN Features ♦ Two 500mA Step-Down Converters Up to 4MHz Switching Frequency Adjustable Output from 0.6V to 3.3V ♦ Four Low-Noise LDOs with Pin-Programmable Output Voltages ♦ One Open-Drain Driver ♦ 60ms (typ) Reset Timer ♦ Power-On/Off Control Logic and Sequencing ♦ 4mm x 4mm x 0.8mm 24-Pin Thin QFN Dual Step-Down DC-DC Power-Management ICs for Portable Devices ________________________________________________________________ Maxim Integrated Products 1 PART TEMP RANGE PIN-PACKAGE MAX8621YETG -40°C to +85°C 24 Thin QFN 4mm x 4mm (T2444-4) MAX8621YETG+ -40°C to +85°C 24 Thin QFN 4mm x 4mm (T2444-4) MAX8621ZETG -40°C to +85°C 24 Thin QFN 4mm x 4mm (T2444-4) MAX8621ZETG+ -40°C to +85°C 24 Thin QFN 4mm x 4mm (T2444-4) Ordering Information MAX8621Y MAX8621Z IN1 IN2 IN3 PWRON EN3 EN4 SEL2 ENDR REFBP GND OUT1 OUT2 OUT3 OUT4 DR LX1 FB1 PGND1 LX2 FB2 PGND2 RESET SEL1 EN2 INPUT 2.6V TO 5.5V INPUT OUT4 3V, 150mA OUT3 1.8V, 150mA OUT2 2.6V, 300mA OUT1 2.6V, 300mA BUCK1 1.375V, 500mA BUCK2 1.8V, 500mA RESET Typical Operating Circuit 19-3539; Rev 1; 8/05 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Pin Configuration appears at end of data sheet. EVALUATION KIT AVAILABLE + Denotes lead-free package. |
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