MAX1761 小型、双路、高效率buck控制器，用于笔记本电脑

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The MAX1761 dual pulse-width-modulation (PWM), step-down controller provides high efficiency, excellent transient response, and high DC output accuracy in an extremely compact circuit topology. These features are essential for stepping down high-voltage batteries to generate low-voltage CPU core, I/O, and chipset RAM supplies in PC board area critical applications, such as notebook computers and smart phones.

Maxim's proprietary Quick-PWM™ quick-response, constant-on-time PWM control scheme handles wide input/output voltage ratios with ease and provides "instant-on" response to load transients while maintaining a relatively constant switching frequency.

The MAX1761 achieves high efficiency at reduced cost by eliminating the current-sense resistor found in traditional current-mode PWMs. Efficiency is further enhanced by its ability to drive large synchronous-rectifier MOSFETs. The MAX1761 employs a complementary MOSFET output stage, which reduces component count by eliminating external bootstrap capacitors and diodes.

Single-stage buck conversion allows this device to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, two-stage conversion (stepping down the +5V system supply instead of the battery) at a higher switching frequency allows the minimum possible physical size.

The MAX1761 is intended for CPU core, chipset, DRAM, or other low-voltage supplies. The MAX1761 is available in a 16-pin QSOP package. For applications requiring greater output power, refer to the MAX1715 data sheet. For a single-output version, refer to the MAX1762/MAX1791 data sheet.

关键特性

应用/使用

Free-Running On-Demand PWM
Selectable Light-Load Pulse-Skipping Operation
±1% Total DC Error in Forced-PWM Mode
5V to 20V Input Range
Flexible Output Voltages
- OUT1: Dual Mode™ Fixed 2.5V or 1V to 5.5V Adjustable
- OUT2: Dual Mode Fixed 1.8V or 1V to 5.5V Adjustable
Output Undervoltage Protection
Complementary Synchronous Buck
No Current-Sense Resistor
4.65V at 25mA Linear Regulator Output
4µA V+ Shutdown Supply Current
5µA VL Shutdown Supply Current
950µA Quiescent Supply Current
Tiny 16-Pin QSOP Package

	1.8V/2.5V逻辑和I/O电源
	数码相机
	手持终端
	笔记本电脑与PDA
	智能电话

Key Specifications: Switch-Mode DC-DC Power Supplies

Part Number

Topology

V_IN (min) (V)

V_IN (max) (V)

Number of DC-DC Outputs

Preset V_OUT (V)

Digital/VID Programmed Output

Min. Adjustable V_OUT (V)

Max. Adjustable V_OUT (V)

I_OUT (A)

Operating Current, I_CC (max) (mA)

Fixed Freq/PWM Operation

Operating Freq. (kHz)

Internal Power Switch(es)

Synchronous Rectifier

Package

Smallest Available Package (max w/pins) (mm²)

Price^**

MAX1761

Step-Down

4.5

1.8
2.5

5.5

0.6

1.7

Yes

350

Yes

QSOP/16

$2.95 @ 1k

See All Switch-Mode DC-DC Power Supplies (418)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.