MAX769
2 or 3 Cell, Step-Up/Down, Two-Way Pager System IC
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Complete Power Supply and Monitoring System Simplifies Design, Saves Cost and Space
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Features
- Regulated Step-Up/Step-Down Operation
- 80mA Output from 3 Cells
- 85% Efficiency
- 13µA Idle Mode™ (coast) Current
- Selectable Low-Noise PWM or Low-Current PFM Operation
- PWM Operating Frequency Synchronized to Seven Times an External Clock Source
- Operates at 270kHz with No External Clock
- Automatic Backup-Battery Switchover
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The MAX769 is a complete buck/boost power supply and monitoring system for two-way pagers or other low-power digital communications devices. Few external components are required. Included on-chip are:
- An 80mA output, synchronous-rectified, buck/boost DC-DC converter with a digitally controlled +1.8V to +4.9V output. The DC-DC converter is unique, since it provides a regulated output for battery inputs that are both less than and greater than the output voltage, without using transformers.
- Three low-noise linear-regulator outputs
- Three DAC-controlled comparators for software-driven, 3-channel A/D conversion
- SPI™-compatible serial interface
- Reset and low-battery (LBO) warning outputs
- Charger for NiCd/NiMH, lithium battery, or storage capacitor for RF PA power or system backup
- Two 1.8Ω (typical), serial-controlled, open-drain MOSFET switches for beeper or vibrator drive
Applications
- 2- or 3-Cell-Powered Handheld Equipment
- GPS Receivers
- Two-Way Paging
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MAX769
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Data Sheet
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MAX769: 2 or 3 Cell, Step-Up/Down, Two-Way Pager System IC Data Sheet (Rev.1)
Documentation
Software & Part Ecosystem
| Parts | Product Life Cycle | Description | ||
|---|---|---|---|---|
|
PMIC (DC/DC, PowerPath, and Battery Charger)1 |
||||
|
PRODUCTION |
1 Cell, Step-Up Two-Way Pager System IC |
|||
Evaluation Kits 1
MAX769EVKIT
Evaluation Kit for the MAX769
Features and Benefits
- 1.5V to 5.5V (buck-boost) Input Voltage
- 1.8V to 4.9V Digitally Adjustable Output Voltage
- Up to 80mA Total Output Current
- Three Low-Noise Voltage Regulators
- Charger for Small NiCd, NiMH, Lithium Battery, or Storage Capacitor
- 270kHz Switching Frequency
- 15µA Idle Mode™ Current
- Digitally Controlled 1.8Ω Switches for Vibrators, Beepers, and Other Low-Power Wireless Designs
- Reset and Low-Battery Outputs
- Surface-Mount Components
- Fully Assembled and Tested
Product Detail
The MAX769 evaluation kit (EV kit) provides a platform for evaluating the features of the MAX769. The MAX769 converts a 2-cell or 3-cell, 1.5V to 5.5V battery voltage to four separate output voltages. The main output voltage at OUT is digitally controlled from 1.8V to 4.9V in 100mV steps by a 3-wire SPI™ serial interface. OUT provides up to 80mA. The other outputs (REG1, REG2, and REG3) are low-noise linear-regulator outputs. The MAX769 contains numerous other features for two-way paging and other low-power wireless designs. Consult the MAX769 data sheet for details. The MAX769 EV kit is a fully assembled and tested surface-mount circuit board.
The MAX847 is similar to the MAX769 except that it contains a boost DC-DC converter (for 1-cell inputs) rather than a buck-boost converter (for 2-cell or 3-cell inputs). To evaluate the MAX847, please order the MAX847EVKIT.
Applications
- 2- or 3-Cell-Powered Handheld Equipment
- GPS Receivers
- Two-Way Paging