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LT1310

sn1310 1310fs

1.5A Boost

DC/DC Converter

with Phase-Locked Loop

The LT

current mode PWM switcher with an integrated phase-

locked loop, allowing the user to set the switching fre-

quency anywhere from 10kHz to 4.5MHz. Intended for use

in applications where switching frequency must be accu-

rately controlled, the LT1310 can generate 12V at up to

400mA from a 5V input.

Switching frequency is set with an external capacitor, and

the device can be operated in either free-running or phase-

locked mode. A wide capture range of nearly 2:1 allows the

free-running frequency to be set using standard

±10%

tolerance NP0 dielectric capacitors.

The LT1310 is available in the tiny thermally enhanced

10-lead MSOP package.

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Synchronizable or Constant Frequency

Low Noise Output

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Synchronizable Up to 4.5MHz

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Wide Input Voltage Range: 2.8V to 18V

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Low Profile Surface Mount Solution

(All Ceramic Capacitors)

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Small Thermally Enhanced 10-Lead MSOP Package

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Instruments

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Avionics

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Data Acquisition

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Communications

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Imaging

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Ultrasound

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

SHDN

SHUTDOWN

SYNC

1.6MHz

SYNC

PLL-LPF

3.01k

5V

15k

178k

20.5k

100pF

NP0

1310 F01a

C2

4.7

µF

CERAMIC

12V

400mA

1500pF

820pF

C1: 4.7

µF, X5R OR X7R, 6.3V

C2: 4.7

µF, X5R OR X7R, 16V

D1: MICROSEMI UPS120 OR EQUIVALENT

L1: PANASONIC ELL6SH-5R6M

*EXPOSED PAD MUST ALSO BE GROUNDED

C1

4.7

µF

CERAMIC

FB

SW

D1

LT1310

L1

5.6

µH

GND*

LOAD CURRENT (mA)

0

35

45

55

65

75

100

200

1310 F01b

400

300

85

40

50

60

70

80

90

Figure 1. 5V to 12V Converter Synchronized at 1.6MHz

LT1310 Efficiency

DESCRIPTIO

FEATURES

APPLICATIO S

TYPICAL APPLICATIO