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LTC1754-3.3 Datenblatt(Datasheet) 1 Page - Linear Technology

Teile-Nr. LTC1754-3.3
Beschreibung  Micropower, Regulated 3.3V/5V Charge Pump with Shutdown in SOT-23
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Hersteller  LINER [Linear Technology]
Homepage  http://www.linear.com
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1
LTC1754-3.3/LTC1754-5
Micropower, Regulated
3.3V/5V Charge Pump with
Shutdown in SOT-23
s
Ultralow Power: IIN = 13µA
s
Regulated Output Voltage: 3.3V
±4%, 5V ±4%
s
5V Output Current: 50mA (VIN 3.0V)
s
3.3V Output Current: 40mA (VIN 2.5V)
s
No Inductors Needed
s
Very Low Shutdown Current: <1
µA
s
Shutdown Disconnects Load from VIN
s
Internal Oscillator: 600kHz
s
Short-Circuit and Overtemperature Protected
s
Ultrasmall Application Circuit: (0.052 Inch2)
s
6-Pin SOT-23 Package
s
SIM Interface Supplies for GSM Cellular Telephones
s
White LED Power Supplies
s
Li-Ion Battery Backup Supplies
s
Handheld Computers
s
Smart Card Readers
s
PCMCIA Local 5V Supplies
The LTC
®1754 is a micropower charge pump DC/DC
converter that produces a regulated output. The input
voltage range is 2V to 4.4V for 3.3V output and 2.7V to
5.5V for 5V output. Extremely low operating current and a
low external parts count (one flying capacitor and two
small bypass capacitors at VINandVOUT)maketheLTC1754
ideally suited for small, battery-powered applications. The
total component area of the application circuit shown
below is only 0.052 inch2.
The LTC1754 operates as a Burst Mode
TM switched capaci-
tor voltage doubler to produce a regulated output. It has
thermal shutdown capability and can survive a continuous
short circuit from VOUT to GND.
The LTC1754 is available in a 6-pin SOT-23 package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
LTC1754-5
Output Voltage vs Supply Voltage
FEATURES
DESCRIPTIO
APPLICATIO S
TYPICAL APPLICATIO
SUPPLY VOLTAGE (V)
2.5
4.85
4.90
4.95
5.00
5.05
5.15
3.0
3.5
4.0
4.5
1574 TA03
5.0
5.5
5.10
TA = –40°C
TA = 85°C
IOUT = 25mA
COUT = 10µF
CFLY = 1µF
TA = 25°C
SUPPLY VOLTAGE (V)
2.0
3.30
3.35
4.0
1754 TA02
3.25
3.20
2.5
3.0
3.5
4.5
3.40
IOUT = 20mA
COUT = 10µf
CFLY = 1µF
TA = 85°C
TA = 25°C
TA = –40°C
LTC1754-3.3
Output Voltage vs Supply Voltage
1
LTC1754-X
Regulated 3.3V Output from 2V to 4.4V Input
Regulated 5V Output from 2.7V to 5.5V Input
2
3
6
5
4
ON/OFF
VOUT
1754 TA01
VIN
VOUT
VOUT = 5V ±4%
IOUT = 0mA TO 25mA, VIN > 2.7V
IOUT = 0mA TO 50mA, VIN > 3.0V
10
µF
1
µF
10
µF
GND
SHDN
C+
VIN
C
VOUT = 3.3V ±4%
IOUT = 0mA TO 20mA, VIN > 2.0V
IOUT = 0mA TO 40mA, VIN > 2.5V




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