LT1766/LT1766-5

1

1766fc

TYPICAL APPLICATION

DESCRIPTION

5.5V to 60V 1.5A, 200kHz

Step-Down Switching Regulator

5V Buck Converter

FEATURES

APPLICATIONS

Full Duty Cycle Range

TSSOP Packages

The LT

ing regulators that accept input voltages up to 60V. A high

efficiency 1.5A, 0.2Ω switch is included on the die along

with all the necessary oscillator, control and logic circuitry.

A current mode control architecture delivers fast transient

response and excellent loop stability.

Special design techniques and a new high voltage process

achieve high efficiency over a wide input range. Efficiency

is maintained over a wide output current range by using the

output to bias the circuitry and by utilizing a supply boost

capacitor to saturate the power switch. Patented circuitry

maintains peak switch current over the full duty cycle range.

A shutdown pin reduces supply current to 25μA and the

device can be externally synchronized from 228kHz to

700kHz with logic-level inputs.

The LT1766/LT1766-5 are available in a 16-pin fused-lead

SSOP package or a TSSOP package with exposed backside

for improved thermal performance.

Efficiency vs Load Current

BOOST

6

2

10

12

10MQ060N

15.4k

5V

1A

4

15

14

11

220pF

0.022μF

*

†

FOR INPUT VOLTAGES BELOW 7.5V, SOME RESTRICTIONS MAY APPLY

TDK C4532X7R2A225K

1, 8, 9, 16

LT1766

SHDN

SYNC

SW

BIAS

FB

GND

0.33μF

100μF 10V

SOLID

TANTALUM

47μH

1N4148W

4.99k

1766 TA01

2.2μF

†

100V

CERAMIC

5.5V TO 60V

+

2.2k

ON

OFF

LOAD CURRENT (A)

0

80

90

100

1.00

1766 TA02

70

60

50

0.25

0.50

0.75

1.25

L = 47μH

L, LT, LTC, LTM, 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. Protected by U.S. Patents, including 6498466, 6531909.