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LTC3252 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC3252
Description  Dual, Low Noise, Inductorless Step-Down DC/DC Converter
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3252 Datasheet(HTML) 1 Page - Linear Technology

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LTC3252
1
3252f
The LTC
®3252 is a switched capacitor step-down DC/DC
converter that produces two adjustable regulated outputs
from a single 2.7V to 5.5V input. The part uses switched
capacitor fractional conversion to achieve a typical effi-
ciency increase of 50% over that of a linear regulator. No
inductors are required.
A unique constant frequency, spread spectrum architec-
ture provides a very low noise regulated output as well as
low noise at the input. The part also has Burst Mode
®
operation to provide high efficiency at low output currents,
as well as ultralow current shutdown.
Low operating currents (60
µA with both outputs enabled,
35
µA with one output enabled) and low external parts
count make the LTC3252 ideally suited for space-con-
strained battery-powered applications. The part is short-
circuit and overtemperature protected and is available in a
tiny 4mm
× 3mm 12-pin DFN package.
s
Handheld Electronic Devices
s
Cellular Phones
s
Low Voltage Logic Supplies
s
DSP Power Supplies
s
3.3V to 1.5V Conversion
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
2.7V to 5.5V Input Voltage Range
s
No Inductors
s
Typical Efficiency 50% Higher than LDOs
s
Spread Spectrum Operation
s
Low Input and Output Noise
s
Shutdown Disconnects Load from VIN
s
Dual Adjustable Independent Outputs
(Range: 0.9V to 1.6V)
s
Output Current: 250mA Each Output
s
Low Operating Current: IIN = 60µA Typ
(35
µA with One Output Enabled)
s
Low Shutdown Current: IIN = 0.01µA Typ
s
Soft-Start Limits Inrush Current at Turn On
s
Short Circuit and Over Temperature Protected
s
Available in 4mm
× 3mm 12-Pin DFN Package
Dual, Low Noise,
Inductorless Step-Down
DC/DC Converter
Burst Mode is a registered trademark of Linear Technology Corporation.
1.5V and 1.2V Output Voltages with Shutdown
470k
5
510k
4.7
µF
OUT1
1
FB1
261k
9
510k
4.7
µF
LTC3252
3252 TA01
1-CELL
Li-ION
OR 3-CELL
NiMH
VOUT = 1.5V
IOUT ≤ 250mA
VOUT = 1.2V
IOUT ≤ 250mA
4.7
µF
1
µF
OUT2
12
FB2
2
EN1
3
VIN
10
C2+
8
C2
1
µF
4
C1+
6
C1
7
GND
OFF ON
11
EN2
OFF ON
1.5V/1.2V Efficiency vs Input Voltage
VIN (V)
2.7
100
90
80
70
60
50
40
30
20
10
0
3252 TA01a
3.1
3.5
3.9
4.3
4.7
5.1
5.5
IOUT (1.5V) = 100mA
IOUT (1.2V) = 100mA
LTC3252-1.5V
LTC3252-1.2V
LDO-1.5V
LDO-1.2V
DESCRIPTIO
FEATURES
APPLICATIO S
TYPICAL APPLICATIO


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