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Part Number: MAX1774
Description: The MAX1774 is a complete power-supply solution for PDAs and other hand-held devices. It integrates tw...
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MAX1774
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General Description
MAX1774 General Description
The MAX1774 is a complete power-supply solution for PDAs and other hand-held devices. It integrates two high-efficiency step-down converters, a boost converter for backup battery regulation, and four voltage detectors in a small 32-pin QFN or 28-pin QSOP package.
The MAX1774 accepts inputs from +2.7V to +28V and provides an adjustable main output from 1.25V to 5.5V at over 2A. The secondary core converter delivers an adjustable voltage from 1V to 5V and can deliver up to 1.5A. Both the main and core regulators have separate shutdown inputs.
When the AC adapter power is removed, an external Pchannel MOSFET switches input to the main battery. When the main battery is low, the backup step-up converter sustains the main output voltage. When the backup battery can no longer deliver the required load, the system shuts down safely to prevent damage. Four onboard voltage detectors monitor the status of the AC adapter power, main battery, and backup battery.
The MAX1774 evaluation kit is available to help reduce design time.
MAX1774 Maximum Ratings
IN, SHDNM, MDRV, DBI, LBI, ACI,
CVH to GND ........................................................-0.3V to +30V
IN to CVH, PDRV ......................................................-0.3V to +6V
BIN to CS-................................................................-0.3V to +6V
LXB to GND ................................................-0.3V to (VBIN+ 0.7V)
PDRV to GND...................................(VCVH - 0.3V) to (VIN + 0.3V)
All Other Pins to GND...............................................-0.3V to +6V
PGND to GND .......................................................-0.3V to +0.3V
Continuous Power Dissipation
28-Pin QSOP (derate 10.8mW/ above +70)...........860mW
32-Pin QFN (derate 23.2mW/ above +70) ...........1860mW
Operating Temperature .......................................-40 to +85
Storage Temperature.........................................-65 to +150
Temperature (soldering, 10s) ..........................................+300
CVH to GND ........................................................-0.3V to +30V
IN to CVH, PDRV ......................................................-0.3V to +6V
BIN to CS-................................................................-0.3V to +6V
LXB to GND ................................................-0.3V to (VBIN+ 0.7V)
PDRV to GND...................................(VCVH - 0.3V) to (VIN + 0.3V)
All Other Pins to GND...............................................-0.3V to +6V
PGND to GND .......................................................-0.3V to +0.3V
Continuous Power Dissipation
28-Pin QSOP (derate 10.8mW/ above +70)...........860mW
32-Pin QFN (derate 23.2mW/ above +70) ...........1860mW
Operating Temperature .......................................-40 to +85
Storage Temperature.........................................-65 to +150
Temperature (soldering, 10s) ..........................................+300
MAX1774 Features
* Dual, High-Efficiency, Synchronous-Rectified
Step-Down Converters
* Thin, Small (1mm High) QFN Package
* Step-Up Converter for Backup Battery
* Main Power
Adjustable from +1.25V to +5.5V
Over 2A Load Current
Up to 95% Efficiency
* Core Power
Adjustable from 1V to 5V
Internal Switches
Up to 1.5A Load Current
Up to 91% Efficiency
* Automatic Main Battery Switchover
* 100% (max) Duty Cycle
* Up to 1.25MHz Switching Frequency
* Input Voltage Range from +2.7V to +28V
* Four Low-Voltage Detectors
* 170µA Quiescent Current
* 8µA Shutdown Current
* Digital Soft-Start
* Independent Shutdown Inputs
Step-Down Converters
* Thin, Small (1mm High) QFN Package
* Step-Up Converter for Backup Battery
* Main Power
Adjustable from +1.25V to +5.5V
Over 2A Load Current
Up to 95% Efficiency
* Core Power
Adjustable from 1V to 5V
Internal Switches
Up to 1.5A Load Current
Up to 91% Efficiency
* Automatic Main Battery Switchover
* 100% (max) Duty Cycle
* Up to 1.25MHz Switching Frequency
* Input Voltage Range from +2.7V to +28V
* Four Low-Voltage Detectors
* 170µA Quiescent Current
* 8µA Shutdown Current
* Digital Soft-Start
* Independent Shutdown Inputs
MAX1774 Typical Application
* Hand-Held Computers
* PDAs
* Internet Access Tablets
* POS Terminals
* Subnotebooks
* PDAs
* Internet Access Tablets
* POS Terminals
* Subnotebooks
MAX1774 Connection Diagram
MAX1774
PDF/DataSheet Download
- Datasheet: MAX1774
- File Size: 413163 KB
- Manufacturer: MAXIM [Maxim Integrated Products]
- Click here to Download
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