MAX799：同步整流降压型控制器，用于CPU电源 _ BDTIC 中国领先电子元器件代理商

MAX799：同步整流降压型控制器，用于CPU电源

对于新设计推荐使用性能更好的器件：MAX1652/MAX1653/MAX1654/MAX1655

The MAX796/MAX797/MAX799 high-performance, step-down DC-DC converters with single or dual outputs provide main CPU power in battery-powered systems. These buck controllers achieve 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 MAX796/MAX799 are specially equipped with a secondary feedback input (SECFB) for transformer-based dual-output applications. This secondary feedback path improves cross-regulation of positive (MAX796) or negative (MAX799) auxiliary outputs. The MAX797 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-bar 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 MAX796/MAX797/MAX799 are all available in 16-pin DIP and narrow SO packages. See the table below to compare these three converters.

关键特性

96% Efficiency
4.5V to 30V Input Range
2.5V to 6V Adjustable Output
Preset 3.3V and 5V Outputs (at up to 10A)
Multiple Regulated Outputs
+5V Linear-Regulator Output
Precision 2.505V Reference Output
Automatic Bootstrap Circuit
150kHz/300kHz Fixed-Frequency PWM Operation
Programmable Soft-Start
375µA Typ Quiescent Current (VIN = 12V, VOUT = 5V)
1µA Typ Shutdown Current

MAX796、MAX797、MAX799：典型工作电路

应用

蜂窝电话
笔记本电脑和亚笔记本电脑
PDA与移动通信

数据手册DataSheet

语言	下载文件	备注
英文	MAX796-MAX799.pdf	Rev 4; 10/2005

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
MAX797	4.5	30	2.5	6	3.3 5	Preset Resistor	10	External	Yes	1	340	CDIP(N)/16 PDIP(N)/16 SOIC(N)/16	$5.57 @1k
MAX799	4.5	30	2.5	6	3.3 5	Preset Resistor	10	External	Yes	1	340	CDIP(N)/16 PDIP(N)/16 SOIC(N)/16	-

开发工具

MAX797EVKIT

质量和环境数据

MAX799.pdf

订购型号

型号	状况	推荐替代产品	封装	温度	RoHS/无铅
MAX799C/D	停止供货		DICE SALES,；NA引脚；DICE；	0°C至+70°C	参考数据资料
MAX799CPE	停止供货		PDIP(N),；16引脚；158.4mm²	0°C至+70°C	RoHS/无铅：否
MAX799CSE	停止供货		SOIC(N),；16引脚；61.9mm²	0°C至+70°C	RoHS/无铅：否
MAX799CSE+	停止供货		SOIC(N),；16引脚；61.9mm²	0°C至+70°C	RoHS/无铅：无铅
MAX799CSE+T	停止供货		SOIC(N),；16引脚；61.9mm²	0°C至+70°C	RoHS/无铅：无铅
MAX799CSE-T	停止供货		SOIC(N),；16引脚；61.9mm²	0°C至+70°C	RoHS/无铅：否
MAX799EPE	停止供货		PDIP(N),；16引脚；158.4mm²	-40°C至+85°C	RoHS/无铅：否
MAX799ESE	停止供货	MAX799ESE+	SOIC(N),；16引脚；61.9mm²	-40°C至+85°C	RoHS/无铅：否
MAX799ESE+	生产中		SOIC(N),；16引脚；61.9mm²	-40°C至+85°C	RoHS/无铅：无铅
MAX799ESE+T	生产中		SOIC(N),；16引脚；61.9mm²	-40°C至+85°C	RoHS/无铅：无铅
型号	状况	推荐替代产品	封装：类型引脚占位面积封装图编码/变更 *	温度	RoHS/无铅？
MAX799ESE-T	停止供货	MAX799ESE+T	N.SO；16引脚	-40°C至+85°C	参考数据资料
MAX799MJE	停止供货		CDIP(N),；16引脚；173.5mm²	-55°C至+125°C	RoHS/无铅：否

MAX796-MAX799.pdf MAX799

MAX799.pdf MAX799

典型工作电路 MAX799