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Switching Regulators 
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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 140µA Quiescent Current Soft-Start 10-Pin µMAX Package
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Key Features
Applications/Uses
Parametric specs for Step-Down Switching Regulators
| VIN (V) (min) | 2.6 |
| VIN (V) (max) | 5.5 |
| VOUT1 (V) (min) | 0.75 |
| VOUT1 (V) (max) | 5 |
| IOUT1 (A) (max) | 0.8 |
| Switch Type | Internal |
| Output Adjust. Method | Resistor |
| Synchronous Switching? | Yes |
| Power Good Signal | Yes |
| # DC-DC Outputs | 1 |
| Switching Frequency (kHz) | 1000 |
| Package/Pins | UMAX/10 |
| Budgetary Price (See Notes) | $1.91 @1k |
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Simplified Block Diagram
Technical Docs
| Data Sheet | Low-Output-Voltage, 800mA, PWM Step-Down DC-DC Converters | Aug 29, 2002 |
Support & Training
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Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
Parameters
Parametric specs for Step-Down Switching Regulators
| VIN (V) (min) | 2.6 |
| VIN (V) (max) | 5.5 |
| VOUT1 (V) (min) | 0.75 |
| VOUT1 (V) (max) | 5 |
| IOUT1 (A) (max) | 0.8 |
| Switch Type | Internal |
| Output Adjust. Method | Resistor |
| Synchronous Switching? | Yes |
| Power Good Signal | Yes |
| # DC-DC Outputs | 1 |
| Switching Frequency (kHz) | 1000 |
| Package/Pins | UMAX/10 |
| Budgetary Price (See Notes) | $1.91 @1k |
Key Features
Applications/Uses
- Battery-Powered Equipment
- DSP Core Power
- PDAs and Palmtops
- WCDMA Handsets
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 140µA 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 forced PWM operation 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 µMAX package.
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 forced PWM operation 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 µMAX package.
Technical Docs
| Data Sheet | Low-Output-Voltage, 800mA, PWM Step-Down DC-DC Converters | Aug 29, 2002 |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
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