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SC1464CMSTR Datasheet

  • SC1464CMSTR

  • 60mA PROGRAMMABLE FIXED FREQUENCY CHARGE PUMP DOUBLER

  • 107.08KB

  • 10頁

  • SEMTECH   SEMTECH

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60mA PROGRAMMABLE FIXED
FREQUENCY CHARGE PUMP DOUBLER
PRELIMINARY - August 11, 2000
SC1464
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鈥檚 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
IN
=
2.85V and V
OUT
= 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
錚?
Small size - MSOP-8 package
錚?
Typical efficiency of 90% @ full load
錚?
Designed to work with ceramic or tantalum
錚?
錚?
錚?
錚?
錚?
錚?
錚?
capacitors
Soft start functionality
Short-Circuit and Over-Temperature protection
<55碌A(chǔ) input current @ no load (TF1=0;TF2=1)
<330碌A(chǔ) input current @ no load (TF1=0;TF2=0)
Oscillator frequency accurate to 鹵5%
Shutdown current < 1碌A(chǔ)
All Specifications rated over the full temperature
range (-40擄C to 85 擄C)
APPLICATIONS
錚?
錚?
錚?
錚?
Cellular phones
Handheld devices
PDA power supplies
Peripheral card supplies
ORDERING INFORMATION
Part Number
(1)
Package
MSOP-8
SC1464CMS.TR
APPLICATION CIRCUIT
U1
SC1464
7
Vin
EN
GND
TF1
TF2
Note:
(1) Only available in tape and reel packaging. A reel
contains 2500 devices.
Vin =3 V +/- 5%
4
1
2
Vo =5.2 V to 6.2 V
Vo
C+
C-
3
5
CBucket
6
Cout
Logic Input or Vin
Cin
TF1
TF2
Iout
60mA
20mA
60mA
20mA
Freq
260kHz
260kHz
1MHz
1MHz
Cin
3.3uF
1.0uF
1.0uF
0.22uF
8
Cout
3.3uF
1.0uF
1.0uF
0.22uF
CBucket
2.2uF
0.22uF
0.22uF
0.10uF
1
漏 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320

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