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| 型号： | MAX1878ETC+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 1/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST SYNC ADJ 12TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 1.25 V ~ 28 V |
| 输入电压： | 2 V ~ 5.5 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 500mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-WQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 12-TQFN-EP（4x4） |
ATION
EVALU
AVAIL
19-2248; Rev 2; 5/11
KIT
ABLE
Dual-Output Step-Down and LCD Step-Up
Power Supply for PDAs
General Description
The MAX1878 dual power supply contains a step-down
and step-up DC-DC converter in a small 12-pin TQFN
package for use in PDAs. The step-down DC-DC convert-
er delivers over 500mA to an output as low as 1.25V for
logic power. The step-up DC-DC converter delivers over
15mA and an output as high as 28V for a liquid crystal dis-
play (LCD). With an input voltage from 2.0V to 5.5V the
MAX1878 is intended for use in systems powered by a
2-cell alkaline or 1-cell lithium-ion (Li+) battery.
Fast switching frequency allows the use of small inductors
and capacitors, and the low 19μA typical quiescent cur-
rent allows high efficiency when the system is in standby
mode. Each output can be independently enabled.
The MAX1878 is available in a small 0.75mm high 4mm x
4mm 12-pin TQFN package and requires no external FETs.
The MAX1878 evaluation kit is available to speed designs.
________________________Applications
Features
o Evaluation Kit Available to Speed Designs
o Two Output Voltages
Main Output: 1.25V to V IN
LCD Output: Up to 28V
o 2.0V to 5.5V Input Range
o Low 19 μ A Quiescent Supply Current
o 1 μ A Shutdown Supply Current
o High Switching Frequency for Small External
Components
o Small 0.75mm High 4mm x 4mm 12-Pin TQFN
Package
Ordering Information
Personal Digital Assistants (PDA)
Organizers/Translators
PART
TEMP RANGE
PIN-
PACKAGE
TOP
MARK
MP3 Players
MAX1878ETC+ -40°C to +85°C 12-TQFN-EP*
AAGC
GPS Receivers
__________Typical Operating Circuit
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Pin Configuration
INPUT
2.0V TO 5.5V
10 μ H
TOP VIEW
9
8
7
IN
LXLCD
LCD OUTPUT
UP TO 28V
FBLCD
0.1 μ F
ONLCD 10
6
FBLCD
AIN1
ON
AIN2
MAX1878
LX
FB
10 μ H
MAIN OUTPUT
1.25V TO V IN
PGNDLCD 11
PGND 12
+
MAX1878
EP*
5
4
FB
AIN2
MAIN
OFF
ON
ON
LCD
OFF
ONLCD
1
2
3
PGND
AGND PGNDLCD
*CONNECT EP TO AGND.
TQFN
4mm x 4mm
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1878ETC+ | 功能描述:直流/直流开关转换器 Dual-Output Step-Down RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1878ETC+T | 功能描述:直流/直流开关转换器 Dual-Output Step-Down RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1878EVKIT | 功能描述:直流/直流开关转换器 Evaluation Kit for the MAX1878 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1879EUA | 功能描述:电池管理 1-Cell Li+ Pulse Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX1879EUA+ | 功能描述:电池管理 1-Cell Li+ Pulse Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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