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Part Number: MAX1928
Description: The MAX1927/MAX1928 800mA step-down converterspower low-voltage microprocessors in compact equipmentrequ...
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MAX1928
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DataSheet
General Description
MAX1928 General Description
The MAX1927/MAX1928 800mA step-down converters power low-voltage microprocessors in compact equipment requiring the highest possible efficiency. The MAX1927/MAX1928 are optimized for generating low output voltages (down to 750mV) at high efficiency using small external components. The supply voltage range is from 2.6V to 5.5V and the guaranteed minimum output current is 800mA. 1MHz pulse-width modulation(PWM) switching allows for small external components. A unique control scheme minimizes ripple at light loads, while maintaining a low 140A quiescent current.
The MAX1927/MAX1928 include a low on-resistance internal MOSFET switch and synchronous rectifier to maximize efficiency and minimize external component count. No external diode is needed. 100% duty-cycle operation allows for a dropout voltage of only 340mV at 800mA. Other features include internal soft-start, power-OK (POK) output, and selectable for lower noise at all load currents.
The MAX1928 is available with several preset output voltages: 1.5V (MAX1928-15), 1.8V (MAX1928-18), and 2.5V (MAX1928-25). The MAX1927R has adjustable output range down to 0.75V. The MAX1927/MAX1928 are available in a tiny 10-pin MAX package.
MAX1928 Maximum Ratings
IN1, IN2, OUT, SHDN , SET to GND ......................................-0.3V, +6V
PGND to GND .................................................................-0.3V to +0.3V
LX, REF, FB to GND ...........................................-0.3V to (VBATT + 0.3V)
Continuous Power Dissipation (TA = +70°C)
10-Pin MAX (derate 5.6mW/°C above +70°C) ........................444mW
Operating Temperature Range ....................................-40°C to +85°C
Junction Temperature................................................................+150°C
Storage Temperature Range ......................................-65°C to +150°C
Lead Temperature (soldering, 10s) ...........................................+300°C
MAX1928 Features
800mA Output Current
Output Voltages from 0.75V to 5V
2.6V to 5.5V Input Voltage Range
Power-OK Output
No Schottky Diode Required
Selectable Forced PWM Operation
1MHz Fixed-Frequency PWM Operation
140A Quiescent Current
Soft-Start
10-Pin MAX Package
Output Voltages from 0.75V to 5V
2.6V to 5.5V Input Voltage Range
Power-OK Output
No Schottky Diode Required
Selectable Forced PWM Operation
1MHz Fixed-Frequency PWM Operation
140A Quiescent Current
Soft-Start
10-Pin MAX Package
MAX1928 Typical Application
WCDMA Handsets
PDAs and Palmtops
DSP Core Power
Battery-Powered Equipment
PDAs and Palmtops
DSP Core Power
Battery-Powered Equipment
MAX1928 Connection Diagram
MAX1928
PDF/DataSheet Download
- Datasheet: MAX1928
- File Size: 310861 KB
- Manufacturer: Maxim
- Click here to Download
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