LT1054(RevD) 데이터 시트보기 (PDF) - Linear Technology

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LT1054
(Rev.:RevD)

Switched-Capacitor Voltage Converter with Regulator

Linear Technology 

LT1054/LT1054L

Switched-Capacitor Voltage

Converter with Regulator

FEATURES

s Available in Space Saving SO-8 Package

s Output Current: 100mA (LT1054)

125mA (LT1054L)

s Low Loss: 1.1V at 100mA

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

3.5V to 7V (LT1054L)

s Reference and Error Amplifier for Regulation

s External Shutdown

s External Oscillator Synchronization

s Can Be Paralleled

s Pin Compatible with the LTC®1044/LTC7660

APPLICATI S

s Voltage Inverter

s Voltage Regulator

s Negative Voltage Doubler

s Positive Voltage Doubler

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

DESCRIPTIO

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 adjust

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/LT1054L 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•

1

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