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LT1054L

Switched-Capacitor Voltage Converter with Regulator

Linear Technology 

FEATURES

■ Output Current: 100mA (LT1054)

125mA (LT1054L)

■ Reference and Error Amplifier for Regulation

■ Low Loss: 1.1V at 100mA

■ Operating Range:3.5V to 15V (LT1054)

3.5V to 7V (LT1054L)

■ External Shutdown

■ External Oscillator Synchronization

■ Can Be Paralleled

■ Pin Compatible with the LTC®1044/LTC7660

■ Available in SW16 and SO-8 Packages

APPLICATIONS

■ Voltage Inverter

■ Voltage Regulator

■ Negative Voltage Doubler

■ Positive Voltage Doubler

L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks

and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners.

LT1054/LT1054L

Switched-Capacitor Voltage

Converter with Regulator

DESCRIPTION

The LT®1054 is a monolithic, bipolar, switched-capacitor

voltage converter and regulator. The LT1054 provides

higher output current than previously available converters

with significantly lower voltage losses. An adaptive switch

driver scheme optimizes efficiency over a wide range of

output currents. Total voltage loss at 100mA output current

is typically 1.1V. This holds true over the full supply voltage

range of 3.5V to 15V. Quiescent current is typically 2.5mA.

The LT1054 also provides regulation, a feature not previ-

ously available in switched-capacitor voltage converters. By

adding an external resistive divider a regulated output can

be obtained. This output will be regulated against changes

in both input voltage and output current. The LT1054 can

also be shut down by grounding the feedback pin. Supply

current in shutdown is less than 100µA.

The internal oscillator of the LT1054 runs at a nominal

frequency of 25kHz. The oscillator pin can be used to ad-

just the switching frequency or to externally synchronize

the LT1054.

The LT1054 is pin compatible with previous converters

such the LTC1044/LTC7660.

BLOCK DIAGRAM

VREF

6

2.5V

REFERENCE

R

+

1

FEEDBACK/

SHUTDOWN

–

R

OSC

7

OSC

VIN

8

DRIVE

CAP + 2

Q

CIN*

Q

CAP– 4

DRIVE

DRIVE

*EXTERNAL CAPACITORS

DRIVE

3 GND

COUT*

5 –VOUT

LT1054 • BD

LT1054/LT1054 Voltage Loss

2

3.5V ≤ VIN ≤ 15V (LT1054)

3.5V ≤ VIN ≤ 7V (LT1054L)

CIN = COUT = 100µF

INDICATES GUARANTEED

TEST POINT

LT1054L

LT1054

1

TJ = 125°C

TJ = 25°C

TJ = –55°C

0

0

25

50

75 100 125

OUTPUT CURRENT (mA)

1054 TA01•

1954lff

1

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