SC1464 Datasheet, PDF (1/10 Pages) Semtech Corporation – 60mA PROGRAMMABLE FIXED FREQUENCY CHARGE PUMP DOUBLER

60mA PROGRAMMABLE FIXED
FREQUENCY CHARGE PUMP DOUBLER
SC1464
PRELIMINARY - August 11, 2000
DESCRIPTION
TEL:[phone] FAX:[phone] WEB:http://www.semtech.com
FEATURES
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_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.
= Small size - MSOP-8 package
= Typical efficiency of 90% @ full load
= Designed to work with ceramic or tantalum
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)
APPLICATIONS
= Cellular phones
= Handheld devices
= PDA power supplies
= Peripheral card supplies
APPLICATION CIRCUIT
ORDERING INFORMATION
Part Number⁽¹⁾
Package
SC1464CMS.TR
MSOP-8
Note:
(1) Only available in tape and reel packaging. A reel
contains 2500 devices.
Vin =3 V +/- 5%
Logic Input or Vin
Cin
TF1
TF2
U1
SC1464
7 _Vin
Vo ³
4 _EN
C+ ⁵
1
TF1
2 _TF2
C- ⁶
Vo =5.2 V to 6.2 V
CBucket
Cout
Iout
60mA
20mA
60mA
20mA
© 2000 SEMTECH CORP.
Freq
260kHz
260kHz
1MHz
1MHz
Cin
3.3uF
1.0uF
1.0uF
0.22uF
Cout
3.3uF
1.0uF
1.0uF
0.22uF
CBucket
2.2uF
0.22uF
0.22uF
0.10uF
1
652 MITCHELL ROAD NEWBURY PARK CA 91320