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參數(shù)資料
| 型號(hào)： | CM3728 |
| 英文描述： | 2.5G/3G Cellular Phone Buck Regulator|Battery Management ICs |
| 中文描述： | 能工作蜂窩電話降壓穩(wěn)壓器|電池管理IC |
| 文件頁(yè)數(shù)： | 1/11頁(yè) |
| 文件大?。?/td> | 267K |
| 代理商： | CM3728 |
CM3728
2.5G/3G C
ELLULAR
P
HONE
B
UCK
R
EGULATOR
GENERAL DESCRIPTION
The CM3728 low-dropout, pulse-width-modulated (PWM)
DC-DC buck regulator is optimized to provide power to the PA
in 2.5G/3G cellular phones; however, they may be applied in
many other applications where high efficiency is a priority. The
supply voltage range is from 2V to 5V, and the guaranteed
output current is 1.5A. 1.2MHz PWM switching allows for
small external components, while skip mode reduces
quiescent current to 220μA with light loads.
The CM3728 is dynamically controlled to provide varying
output voltages from 0.8V to 4V. The circuit is designed such
that the output voltage settles in <30μs for a full-scale change
in voltage and current. The CM3728 is set with external
resistors to provide any fixed output voltage in the 1.25V to
5.5V range.
The CM3728 includes a low on-resistance internal MOSFET
switch and synchronous rectifier to maximize efficiency and
minimize external component count. The device is offered in
space-saving 8-pin TSSOP package.
2002/09/30
Rev. 1.0
Champion Microelectronic Corporation
Page 1
FEATURES
!
Patent Filed #6,452,366
!
1.2MHz switching and synchronization
!
Fast output setting slew rate < 30μs
!
Dynamic output-voltage adjustment from 0.8V to 4V
!
Source and sink up to 1.5A, no heat sink required
!
Integrated Power MOSFETs
!
Output voltage can be programmed by D/A converter
!
Minimum external components
!
Shutdown < 1uA
!
Thermal shutdown protection
!
External Soft Start
!
8-pin PTSSOP power packages
!
No external Schottky diode required
24 Hours Technical Support---WebSIM
Champion provides customers an online circuit simulation tool
called WebSIM. You could simply logon our website at
www.champion-micro.com for details.
APPLICATIONS
PIN CONFIGURATION
!
2.5G/3G Cellular Phone
!
RF Transceiver
!
Microprocessor Core Supplies
!
PDA, Palmtop
!
Portable Computer
!
Hand-Held Instruments
PTSSOP-8 (PT08)
Top View
1
2
3
4
8
7
6
5
BATT
GND
SD
VREF
PVDD
LX
PGND
VFB
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