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參數(shù)資料
| 型號： | SC1464CMSTR |
| 廠商： | Semtech Corporation |
| 英文描述： | 60mA PROGRAMMABLE FIXED FREQUENCY CHARGE PUMP DOUBLER |
| 中文描述： | 60mA的可編程固定頻率的電荷泵倍增 |
| 文件頁數(shù)： | 1/10頁 |
| 文件大?。?/td> | 104K |
| 代理商： | SC1464CMSTR |
2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
60mA PROGRAMMABLE FIXED
FREQUENCY CHARGE PUMP DOUBLER
SC1464
PRELIMINARY - August 11, 2000
1
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1464 is a versatile charge pump designed for
use in battery operated power supply applications. A
simple, low current charge pump doubler can be imple-
mented without costly inductors or capacitors. Internal
MOSFET’s and control circuitry eliminate the need for
costly board space and design time. The small device
footprint allows for compact circuit design.
The SC1464 charge pump can be used for applications
that require up to 60mA of output current with V
=
2.85V and V
= 5.2V. The small 8 lead MSOP-8
package helps minimize board space.
The TF1 and TF2 pins provide binary control of the
oscillator frequency to either 1 MHz, 260kHz, 32kHz or
8kHz. The user can change the frequency during oper-
ation with extremely fast settling time.
FEATURES
=
=
=
capacitors
=
Soft start functionality
=
Short-Circuit and Over-Temperature protection
=
<55μA input current @ no load (TF1=0;TF2=1)
=
<330μA input current @ no load (TF1=0;TF2=0)
=
Oscillator frequency accurate to ±5%
=
Shutdown current < 1μA
=
All Specifications rated over the full temperature
range (-40°C to 85 °C)
Small size - MSOP-8 package
Typical efficiency of 90% @ full load
Designed to work with ceramic or tantalum
APPLICATIONS
=
=
=
=
Cellular phones
Handheld devices
PDA power supplies
Peripheral card supplies
ORDERING INFORMATION
Part Number
(1)
Package
SC1464CMS.TR
MSOP-8
Note:
(1) Only available in tape and reel packaging. A reel
contains 2500 devices.
APPLICATION CIRCUIT
CBucket
Logic Input or Vin
TF1
Iout Freq
60mA 260kHz
20mA 260kHz
60mA 1MHz
20mA 1MHz
U1
SC1464
3
7
8
5
6
4
1
2
Vo
Vin
G
C+
C-
EN
TF1
TF2
Vo =5.2 V to 6.2 V
Cout
3.3uF 3.3uF 2.2uF
1.0uF 1.0uF 0.22uF
1.0uF 1.0uF 0.22uF
0.22uF 0.22uF 0.10uF
Vin =3 V +/- 5%
TF2
Cin
Cin Cout CBucket
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