LT1618 查看數據表（PDF） - Linear Technology

零件编号

产品描述 (功能)

生产厂家

LT1618

Constant-Current/Constant-Voltage 1.4MHz Step-Up DC/DC Converter

Linear Technology 

LT1618

Constant-Current/

Constant-Voltage 1.4MHz

Step-Up DC/DC Converter

FEATURES

■ Accurate Input/Output Current Control: ±5% Over

Temperature

■ Accurate Output Voltage Control: ±1%

■ Wide VIN Range: 1.6V to 18V

■ 1.4MHz Switching Frequency

■ High Output Voltage: Up to 35V

■ Low VCESAT Switch: 200mV at 1A

■ Available in (3mm × 3mm × 0.8mm) 10-Pin DFN and

10-Pin MSOP Packages

U

APPLICATIO S

■ LED Backlight Drivers

■ USB Powered Boost/SEPIC Converters

■ Input Current Limited Boost/SEPIC Converters

■ Battery Chargers

DESCRIPTIO

The LT®1618 step-up DC/DC converter combines a tradi-

tional voltage feedback loop and a unique current feedback

loop to operate as a constant-current, constant-voltage

source. This fixed frequency, current mode switcher oper-

ates from a wide input voltage range of 1.6V to 18V, and

the high switching frequency of 1.4MHz permits the use of

tiny, low profile inductors and capacitors. The current

sense voltage is set at 50mV and can be adjusted using the

IADJ pin.

Available in the 10-Pin (3mm × 3mm) Exposed Pad DFN

and 10-pin MSOP packages, the LT1618 provides a com-

plete solution for constant-current applications.

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

TYPICAL APPLICATIO

USB to 12V Boost Converter

(with Selectable 100mA/500mA Input Current Limit)

VIN

5V

C1

4.7µF

3.3V

OFF ON

0V

L1

0.1Ω

10µH

D1

2

7

ISN

SW

3

ISP

LT1618

8

1

VIN

FB

9

SHDN

20k

IADJ GND VC

4 5 10

VOUT

12V

R1

909k

C2

4.7µF

R2

107k

3.3V

100mA 500mA

0V

2k

13k

10nF

C1: TAIYO YUDEN JMK212BJ475

C2: TAIYO YUDEN EMK316BJ475

D1: ON SEMICONDUCTOR MBR0520

L1: SUMIDA CR43-100

1618 TA01a

Efficiency Curve

90

85

80

75

70

65

60

0 20 40 60 80 100 120 140 160

LOAD CURRENT (mA)

1618 TA01b

sn1618 1618fas

1

Share Link: