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LT1054/LT1054L

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DESCRIPTIO

FEATURES

APPLICATIO S

BLOCK DIAGRA

Switched-Capacitor Voltage

Converter with Regulator

s

Available in Space Saving SO-8 Package

s

Output Current: 100mA (LT1054)

125mA (LT1054L)

s

Reference and Error Amplifier for Regulation

s

Low Loss: 1.1V at 100mA

s

Operating Range:3.5V to 15V (LT1054)

3.5V to 7V (LT1054L)

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External Shutdown

s

External Oscillator Synchronization

s

Can Be Paralleled

s

Pin Compatible with the LTC

The LT

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 100

µA.

The internal oscillator of the LT1054 runs at a nominal

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

the switching frequency or to externally synchronize the

LT1054.

The LT1054 is pin compatible with previous converters

such the LTC1044/LTC7660.

OUTPUT CURRENT (mA)

0

1

2

50

1054 TA01•

0

25

75

100

125

LT1054

LT1054L

3.5V

3.5V

INDICATES GUARANTEED

TEST POINT

, LTC and LT are registered trademarks of Linear Technology Corporation.

LT1054/LT1054L Voltage Loss

REFERENCE

OSC

DRIVE

DRIVE

DRIVE

DRIVE

OSC

GND

FEEDBACK/

SHUTDOWN

–

+

R

R

*EXTERNAL CAPACITORS

2.5V

6

1

4

3

LT1054 • BD

5

2

8

7

Q

Q

+

+

s

Voltage Inverter

s

Voltage Regulator

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Negative Voltage Doubler

s

Positive Voltage Doubler