1

LT3436

3436fa

APPLICATIO S

FEATURES

TYPICAL APPLICATIO

DESCRIPTIO

3A, 800kHz Step-Up

Switching Regulator

■

Wide Operating Voltage Range: 3V to 25V

Ω/3A Switch

■

±2% Overall Output Voltage Tolerance

Components

■

Low Shutdown Current: 11

µA

■

Constant Maximum Switch Current Rating

at All Duty Cycles*

TSSOP-16 Package

The LT

regulator. A high efficiency 3A, 0.1

Ω switch is included on

the die together with all the control circuitry required to

complete a high frequency, current-mode switching regu-

lator. Current-mode control provides fast transient re-

sponse and excellent loop stability.

New design techniques achieve high efficiency at high

switching frequencies over a wide operating range. A low

dropout internal regulator maintains consistent perfor-

mance over a wide range of inputs from 24V systems to Li-

Ion batteries. An operating supply current of 1mA main-

tains high efficiency, especially at lower output currents.

Shutdown reduces quiescent current to 11

µA. Maximum

switch current remains constant at all duty cycles. Syn-

chronization capability allows an external logic level signal

to increase the internal oscillator from 1MHz to 1.4MHz.

Full cycle-by-cycle switch current limit protection and ther-

mal shutdown are provided. High frequency operation al-

lows the reduction of input and output filtering components

and permits the use of tiny chip inductors. The LT3436 is

available in an exposed pad, 16-pin TSSOP package.

Efficiency vs Load Current

5V to 12V Boost Converter

LT3436

OUTPUT

12V

INPUT

5V

3436 TA01

10nF

470pF

4.7k

10k

1%

90.9k

B220A

22

µF

CERAMIC

4.7

µF

CERAMIC

FB

SHDN

OPEN

OR

HIGH

= ON

GND

SYNC

3.9

µH

LOAD CURRENT (A)

3436 TA01b

90

85

80

75

70

65

60

0

0.2

0.4

0.5

0.1

0.3

0.6

0.7

0.8

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

All other trademarks are the property of their respective owners.

*Protectd by U.S. Patents including 6535042, 6611131, 6498466