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LTC1754-3.3 Datasheet

  • LTC1754-3.3

  • Micropower, Regulated 3.3V/5V Charge Pump with Shutdown in S...

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LTC1754-3.3/LTC1754-5
Micropower, Regulated
3.3V/5V Charge Pump with
Shutdown in SOT-23
FEATURES
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
Ultralow Power: I
IN
= 13
碌
A
Regulated Output Voltage: 3.3V
鹵
4%, 5V
鹵
4%
5V Output Current: 50mA (V
IN
鈮?/div>
3.0V)
3.3V Output Current: 40mA (V
IN
鈮?/div>
2.5V)
No Inductors Needed
Very Low Shutdown Current: <1碌A
Shutdown Disconnects Load from V
IN
Internal Oscillator: 600kHz
Short-Circuit and Overtemperature Protected
Ultrasmall Application Circuit: (0.052 Inch
2
)
6-Pin SOT-23 Package
The LTC
廬
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 V
IN
and V
OUT
) make the LTC1754
ideally suited for small, battery-powered applications. The
total component area of the application circuit shown
below is only 0.052 inch
2
.
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 V
OUT
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.
APPLICATIO S
s
s
s
s
s
s
SIM Interface Supplies for GSM Cellular Telephones
White LED Power Supplies
Li-Ion Battery Backup Supplies
Handheld Computers
Smart Card Readers
PCMCIA Local 5V Supplies
TYPICAL APPLICATIO
V
OUT
10碌F
1
2
3
V
OUT
GND
C
+
V
IN
鈥?/div>
6
5
4
1碌F
V
IN
10碌F
OUTPUT VOLTAGE (V)
LTC1754-3.3
Output Voltage vs Supply Voltage
3.40
I
OUT
= 20mA
C
OUT
= 10碌f
C
FLY
= 1碌F
5.15
5.10
LTC1754-X
1754 TA01
OUTPUT VOLTAGE (V)
ON/OFF
SHDN C
3.35
T
A
= 85擄C
3.30
T
A
= 25擄C
T
A
= 鈥?0擄C
3.25
Regulated 3.3V Output from 2V to 4.4V Input
V
OUT
= 3.3V
鹵
4%
I
OUT
= 0mA TO 20mA, V
IN
> 2.0V
I
OUT
= 0mA TO 40mA, V
IN
> 2.5V
Regulated 5V Output from 2.7V to 5.5V Input
V
OUT
= 5V
鹵
4%
I
OUT
= 0mA TO 25mA, V
IN
> 2.7V
I
OUT
= 0mA TO 50mA, V
IN
> 3.0V
3.20
2.0
2.5
3.5
4.0
3.0
SUPPLY VOLTAGE (V)
4.5
1754 TA02
U
LTC1754-5
Output Voltage vs Supply Voltage
I
OUT
= 25mA
C
OUT
= 10碌F
C
FLY
= 1碌F
5.05
5.00
4.95
4.90
4.85
T
A
= 鈥?0擄C
T
A
= 25擄C
T
A
= 85擄C
2.5
3.0
3.5
4.0
4.5
SUPPLY VOLTAGE (V)
5.0
5.5
1574 TA03
U
U
1

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