MAX1798：CDMA蜂窝电话/PCS电话系统电源 _ BDTIC 中国领先电子元器件代理商

MAX1798：CDMA蜂窝电话/PCS电话系统电源

The MAX1798/MAX1798A/MAX1799/MAX1799A system power supplies are designed specifically for CDMA cellular/PCS handsets. Each device contains five low-dropout linear regulators (LDOs), a 140ms (min) reset timer, a serial interface, push-on/push-off control logic, and two general-purpose open-drain outputs. Only the serial interface is different between the MAX1798/MAX1798A/MAX1799/MAX1799A: the MAX1798/MAX1798A feature an SPI™-compatible serial interface, and the MAX1799/MAX1799A feature an I²C-compatible interface. The "A" parts have a -13% reset threshold, the non-A parts have a 9.5% threshold. The "A" parts have a 175 delay on a reset-triggered shutdown, the non-A shutdown instantly. Each linear regulator features extremely low dropout voltage, specified at two-thirds of the maximum output current. LDO1 is rated for 300mA, while LDOs 2–5 are each rated for 150mA. All LDOs are optimized for low noise and isolation. Each LDO can be individually enabled and disabled through the serial port, as well as individually programmed to any of 32 voltages from 1.8V to 3.3V. The MAX1798/MAX1798A/MAX1799/MAX1799As' wide 2.5V to 5.5V input voltage range makes them compatible with a wide range of input supplies, including a single Li+ cell battery. Both devices are available in thermally enhanced 20-pin TSSOP and TQFN exposed pad (EP) packages. Evaluation kits (MAX1798EVKIT and MAX1799EVKIT) are available to facilitate designs.

关键特性

One 300mA Low-Noise LDO
Four 150mA Low-Noise LDOs
45µVRMS Noise from 10Hz to 100kHz
> 60dB Crosstalk Isolation Below 10kHz
> 60dB PSRR Below 10kHz
125mV (max) Dropout (OUT1 at 200mA)
100mV (max) Dropout (OUT2–5 at 100mA)
Programmable Output Voltages
- 1.8V to 3.3V in 32 Steps
140ms (min) Reset Timer
SPI- or I²C-Compatible Serial Interface
Push-On/Push-Off Control Logic
Two 150mA General-Purpose Open-Drain Outputs
Overcurrent and Thermal Protection (all LDOs)
1µA Shutdown Current
20-Pin Thermally-Enhanced TSSOP or TQFN Packages

MAX1798、MAX1799：典型工作电路

应用

2节或3节NiMH、NiCd或碱性电池供电系统
CDMA蜂窝/PCS手机
手持终端
掌上电脑
PDA
单节Li+电池供电系统

数据手册DataSheet

语言	下载文件	备注
英文	MAX1798-MAX1799.pdf	Rev 2; 06/2010

关键参数

Part Number	Regulators	V_IN (V)	V_IN (V)	Adj. V_OUT (V)	Adj. V_OUT (V)	V_DROPOUT @Rated I_LOAD (V)	Rated I_LOAD (mA)	Rated I_LOAD (mA)	I_CC (µA)	Output Voltage Noise (µV RMS)	Ref. Bypass	Low Batt./ Pwr. Fail Out	POK/Reset Thresh. (V)	Watchdog	Reverse Batt. Protect.	Oper. Temp. (°C)	Package/Pins
Part Number	Regulators	min	max	min	max	typ	Rated I_LOAD (mA)	Rated I_LOAD (mA)	max	typ	Ref. Bypass	Low Batt./ Pwr. Fail Out	nom	Watchdog	Reverse Batt. Protect.	Oper. Temp. (°C)	Package/Pins
MAX1798	5	2.5	5.5	1.8	3.3	0.12	300	300	680	45	Yes	No	Vout-13% Vout-7.5%	No	No	-40 to +85	QFN/20 TSSOP-EP/20
MAX1799	5	2.5	5.5	1.8	3.3	0.12	300	300	680	45	Yes	No	Vout-13% Vout-7.5%	No	No	-40 to +85	QFN/20 TQFN/20 TSSOP-EP/20

开发工具

质量和环境数据

MAX1798.pdf

订购型号

型号	状况	推荐替代产品	封装	温度	RoHS/无铅
MAX1798AEUP	停止供货		TSSOP-EP,；20引脚；42.9mm²	-40°C至+85°C	RoHS/无铅：否
MAX1798AEUP-T	停止供货		TSSOP-EP,；20引脚；42.9mm²	-40°C至+85°C	RoHS/无铅：否
MAX1798EGP	停止供货		QFN,；20引脚；26mm²	-40°C至+85°C	RoHS/无铅：否
MAX1798EGP+	停止供货	MAX1678EUA+	QFN,；20引脚；26mm²	-40°C至+85°C	RoHS/无铅：无铅
MAX1798EGP+T	停止供货	MAX1678EUA+	QFN；	-40°C至+85°C	参考数据资料
MAX1798EGP-T	停止供货		QFN；20引脚	-40°C至+85°C	参考数据资料
MAX1798ETP+	停止供货		TQFN；	-40°C至+85°C	参考数据资料
MAX1798EUP	停止供货	MAX1798EUP+	TSSOP-EP,；20引脚；42.9mm²	-40°C至+85°C	RoHS/无铅：否
MAX1798EUP+	生产中		TSSOP-EP,；20引脚；42.9mm²	-40°C至+85°C	RoHS/无铅：无铅
MAX1798EUP+T	生产中		TSSOP-EP,；20引脚；42.9mm²	-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？
MAX1798EUP-T	停止供货	MAX1798EUP+T	TSSOP-EP,；20引脚；42.9mm²	-40°C至+85°C	RoHS/无铅：否