MAX797H：高压、同步整流、降压型控制器，用于CPU电源

The MAX797H high-performance, step-down DC-DC converter provides main CPU power in battery-powered systems. A 40V rating on the power stage's input allows operation with high-cell-count batteries and a wide range of AC adapters. This buck controller achieves 96% efficiency by using synchronous rectification and Maxim's proprietary Idle Mode™ control scheme to extend battery life at full-load (up to 10A) and no-load outputs. Excellent dynamic response corrects output transients caused by the latest dynamic-clock CPUs within five 300kHz clock cycles. Unique bootstrap circuitry drives inexpensive N-channel MOSFETs, reducing system cost and eliminating the crowbar switching currents found in some PMOS/NMOS switch designs. The MAX797H has a logic-controlled and synchronizable fixed-frequency, pulse-width-modulating (PWM) operating mode, which reduces noise and RF interference in sensitive mobile-communications and pen-entry applications. The SKIP override input allows automatic switchover to idle-mode operation (for high-efficiency pulse skipping) at light loads, or forces fixed-frequency mode for lowest noise at all loads. The MAX797H is pin compatible with the popular MAX797, but has a higher input voltage range. The MAX797H comes in a 16-pin narrow SO package.

关键特性

96% Efficiency
Up to 40V Power Input
2.5V to 6V Adjustable Output
Preset 3.3V and 5V Outputs (at up to 10A)
5V Linear-Regulator Output
Precision 2.505V Reference Output
Automatic Bootstrap Circuit
150kHz/300kHz Fixed-Frequency PWM Operation
Programmable Soft-Start
375µA Quiescent Current (VIN = 12V, VOUT = 5V)
1µA Shutdown Current

MAX797H：典型工作电路

应用

工业控制
笔记本电脑和亚笔记本电脑

数据手册DataSheet

语言	下载文件	备注
英文	MAX797H.pdf	Rev 0; 07/1997

关键参数

Part Number	V_IN (V)	V_IN (V)	V_OUT1 (V)	V_OUT1 (V)	Preset V_OUT (V)	Output Adjust. Method	I_OUT1 (A)	Switch Type	Synchronous Switching	DC-DC Outputs	Oper. Freq. (kHz)	Package/Pins	Budgetary Price
Part Number	min	max	min	max	Preset V_OUT (V)	Output Adjust. Method	max	Switch Type	Synchronous Switching	DC-DC Outputs	Oper. Freq. (kHz)	Package/Pins	See Notes
MAX797H	4.5	40	2.5	6	3.3 5	Preset Resistor	10	External	Yes	1	340	SOIC(N)/16	$5.58 @1k

订购型号

型号	状况	推荐替代产品	封装	温度	RoHS/无铅
MAX797HESE	停止供货	MAX797HESE+	SOIC(N),；16引脚；61.9mm²	-40°C至+85°C	RoHS/无铅：否
MAX797HESE+	生产中		SOIC(N),；16引脚；61.9mm²	-40°C至+85°C	RoHS/无铅：无铅
MAX797HESE+T	生产中		SOIC(N),；16引脚；61.9mm²	-40°C至+85°C	RoHS/无铅：无铅
MAX797HESE-T	停止供货	MAX797HESE+T	N.SO；16引脚	-40°C至+85°C	参考数据资料

MAX797H.pdf MAX797H

典型工作电路 MAX797H