LTC3406AB データシートの表示（PDF） - Linear Technology

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LTC3406AB

1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT

Linear Technology 

Features

nn High Efficiency: Up to 96%

nn 600mA Output Current

nn 2.5V to 5.5V Input Voltage Range

nn 1.5MHz Constant Frequency Operation

nn No Schottky Diode Required

nn Low Dropout Operation: 100% Duty Cycle

nn Low Quiescent Current: 200µA

nn ±2% 0.6V Reference

nn Shutdown Mode Draws <1µA Supply Current

nn Internal Soft-Start Limits Inrush Current

nn Current Mode Operation for Excellent Line and

Load Transient Response

nn Overtemperature Protected

nn Low Profile (1mm) ThinSOTTM Package

Applications

nn Cellular Telephones

nn Satellite and GPS Receivers

nn Wireless and DSL Modems

nn Digital Still Cameras

nn Media Players

nn Portable Instruments

LTC3406AB

1.5MHz, 600mA

Synchronous Step-Down

Regulator in ThinSOT

Description

The LTC®3406AB is a high efficiency monolithic synchro-

nous buck regulator using a constant frequency, current

mode architecture. Supply current with no load is 200µA,

dropping to <1µA in shutdown. The 2.5V to 5.5V input

voltage range makes the LTC3406AB ideally suited for

single Li-Ion battery-powered applications. 100% duty

cycle provides low dropout operation, extending battery

run time in portable systems. PWM pulse skipping mode

operation provides very low output ripple voltage for noise

sensitive applications. Refer to LTC3406A for applications

that require Burst Mode® operation.

Switching frequency is internally set at 1.5MHz, allowing

the use of small surface mount inductors and capacitors.

The internal synchronous switch increases efficiency and

eliminates the need for an external Schottky diode. Low

output voltages are easily supported with the 0.6V feedback

reference voltage. The LTC3406AB is available in a low

profile (1mm) ThinSOT package.

L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.

ThinSOT is a trademark of Linear Technology Corporation.All other trademarks are the property

of their respective owners. Protected by U.S. Patents including 5481178, 6580258.

Typical Application

2.2µH

VIN

VIN

SW

4.7µF

CER

LTC3406AB

22pF

RUN VFB

GND

619k

309k

3406AB TA09

1.8V, 600mA

VOUT

10µF

CER

Efficiency vs Load Current

100

VOUT = 1.8V

90

80

70

60

50

40

30

20

10

0.1

VIN = 2.7V

VIN = 3.6V

VIN = 4.2V

1

10

100

OUTPUT CURRENT (mA)

1000

3406B TA14

For more information www.linear.com/LTC3406AB

3406abfb

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