MAX1763
1.5A, Low-Noise, 1MHz, Step-Up DC-DC Converter
High-Power Low-Noise 1MHz Step-Up DC-DC Converter
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Overview
Features and Benefits
- Up to 94% Efficiency
- +0.7V to +5.5V Input Voltage Range
- 1.1V Guaranteed Startup Input Voltage
- Up to 1.5A Output
- Fixed 3.3V Output or Adjustable (2.5V to 5.5V)
- 1MHz PWM Synchronous-Rectified Topology
- 1µA Logic-Controlled Shutdown
- Analog Gain Block for Linear-Regulator or Low-Battery Comparator
- Adjustable Current Limit and Soft-Start
- 1.5W TSSOP Package Available
Product Details
The MAX1763 is a high-efficiency, low-noise, step-up DC-DC converter intended for use in battery-powered wireless applications. This device maintains exceptionally low quiescent supply current (110µA) despite its high 1MHz operating frequency. Small external components and a tiny package make this device an excellent choice for small hand-held applications that require the longest possible battery life.
The MAX1763 uses a synchronous-rectified pulse-width-modulation (PWM) boost topology to generate 2.5V to 5.5V outputs from a wide range of input sources, such as one to three alkaline or NiCd/NiMH cells or a single Lithium-ion (Li+) cell. Maxim's proprietary Idle Mode™ circuitry significantly improves efficiency at light load currents while smoothly transitioning to fixed-frequency PWM operation at higher load currents to maintain excellent full-load efficiency. Low-noise, forced-PWM mode is available for applications that require constant-frequency operation at all load currents. The MAX1763 may also be synchronized to an external clock to protect sensitive frequency bands in communications equipment.
The MAX1763 includes an on-chip linear gain block that can be used to build a high-power external linear regulator or as a low-battery comparator. Soft-start and current limit functions permit optimization of efficiency, external component size, and output voltage ripple.
The MAX1763 is available in a space-saving 16-pin QSOP package or a high-power (1.5W) 16-pin TSSOP-EP package.
Applications
- Digital Cordless Phones
- Handheld Instruments (PDAs, Palmtops)
- Palmtop Computers
- PCS Phones
- Personal Communicators
- Wireless Handsets
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Production
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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