MAX1637
Miniature, Low-Voltage, Precision Step-Down Controller
Low-Voltage, Precision Step-Down Controller for Portable CPU Power
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Overview
Features and Benefits
- ±2% DC Accuracy
- 0.1% (typ) DC Load Regulation
- Adjustable Switching Frequency to 350kHz
- Idle Mode™ Pulse-Skipping Operation
- 1.10V to 5.5V Adjustable Output Voltage
- 3.15V Minimum IC Supply Voltage (at VCC pin)
- Internal Digital Soft-Start
- 1.1V ±2% Reference Output
- 1µA Total Shutdown Current
- Output Overvoltage Crowbar Protection
- Output Undervoltage Shutdown (foldback)
- Tiny 16-Pin QSOP Package
Product Details
The MAX1637 synchronous, buck, switch-mode power-supply controller generates the CPU supply voltage in battery-powered systems. The MAX1637 is a stripped-down version of the MAX1636 in a smaller 16-pin QSOP package. The MAX1637 is intended to be powered separately from the battery by an external bias supply (typically the +5V system supply) in applications where the battery exceeds 5.5V. The MAX1637 achieves excellent DC and AC output voltage accuracy. This device can operate from a low input voltage (3.15V) and delivers the excellent load-transient response needed by upcoming generations of dynamic-clock CPUs.
Using synchronous rectification, the MAX1637 achieves up to 95% efficiency. Efficiency is greater than 80% over a 1000:1 load-current range, which extends battery life in system-suspend or standby mode. Excellent dynamic response corrects output load transients caused by the latest dynamic-clock CPUs within five 300kHz clock cycles. Powerful 1A on-board gate drivers ensure fast external N-channel MOSFET switching.
The MAX1637 features a logic-controlled and synchronizable, fixed-frequency, pulse-width-modulation (PWM) operating mode. This reduces noise and RF interference in sensitive mobile-communications and pen-entry applications. Asserting the SKIP-bar pin enables fixed-frequency mode, for lowest noise under all load conditions. For a stand-alone device that includes a +5V VL linear regulator and low-dropout capabilities, refer to the MAX1636 data sheet.
Applications
- Handy-Terminals, PDAs
- Notebook Computers
- Subnotebook Computers
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At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
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