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LTC1502-3.3 Datasheet

  • LTC1502-3.3

  • Single Cell to 3.3V Regulated Charge Pump DC/DC Converter

  • 165.63KB

  • 8頁

  • LINER

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LTC1502-3.3
Single Cell to 3.3V
Regulated Charge Pump
DC/DC Converter
FEATURES
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
Input Voltage Range: 0.9V to 1.8V
0.9V Guaranteed Start-Up Voltage
Regulated Output Voltage: 3.3V
鹵4%
Output Current: 10mA (V
IN
鈮?/div>
1V)
No Inductors
Shutdown Disconnects Load from V
IN
Low Operating Current: 40碌A
Low Shutdown Current: 5碌A
Short-Circuit and Overtemperature Protected
Application Circuit Fits in < 0.125in
2
PCB Area
Available in 8-Pin MSOP and SO Packages
The LTC
廬
1502-3.3 is a quadrupler charge pump DC/DC
converter that produces a regulated 3.3V output from a
single alkaline cell input. It requires only five small external
capacitors鈥攏o inductors are required. Low supply cur-
rent (40碌A typical, 5碌A in shutdown) and minimal external
components make the LTC1502-3.3 ideal for space and
power conscious single-cell applications. The total printed
circuit board area of the circuit shown below is less than
0.125in
2
.
Forcing the C1
鈥?/div>
/SHDN pin low through an external resis-
tive pull-down puts the part into shutdown mode. During
shutdown, the internal oscillator is stopped and the load is
disconnected from V
IN
. An internal pull-up current on the
C1
鈥?/div>
/SHDN pin forces the part back into normal operation
once the pull-down resistance is removed.
The LTC1502-3.3 is short-circuit protected and survives
an indefinite V
OUT
short to ground. The LTC1502-3.3 is
available in 8-pin MSOP and SO packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
Pagers
Battery Backup Supplies
Portable Electronic Equipment
Handheld Medical Instruments
Glucose Meters
TYPICAL APPLICATIO
1
10碌F
2
8
Single Cell to 3.3V DC/DC Converter
3.5
C2
V
OUT
7
C1
+
C3
+
1碌F
LTC1502-3.3
6
3
C1
鈥?/div>
/SHDN C3
鈥?/div>
4
5
GND
V
IN
10碌F
1碌F
V
IN
SINGLE CELL
NiCd or
ALKALINE
1502-3.3 TA01
V
OUT
= 3.3V
I
OUT
= 10mA
3.4
OUTPUT VOLTAGE (V)
3.3
I
OUT
= 10mA
I
OUT
= 15mA
10碌F
3.2
3.1
PCB LAYOUT FITS IN < 0.125IN
2
3.0
0.8
U
Output Voltage vs Input Voltage
T
A
= 25擄C
1.0
1.4
1.6
1.2
INPUT VOLTAGE (V)
1.8
1502-3.3 TA02
U
U
1

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