LT1268

更新时间： 2024-11-22 22:55:51

品牌	Logo	应用领域
凌特 - Linear		稳压器开关
页数	文件大小	规格书
4页	67K
描述
7.5A, 150kHz Switching Regulators

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LT1268 数据手册

LT1268B/ LT1268

7.5A, 150kHz

Switc hing Re g ula to rs

DESCRIPTIO

EATURE

■

Wide Input Voltage Range: 3.5V to 30V

Low Quiescent Current: 7mA

Internal 7.5A Switch

Very Few External Parts Required

Self-Protected Against Overloads

Available in Standard and Surface Mount

5-Pin Packages

The LT1268B and LT1268 are monolithic high power

switching regulators. Identical to the popular LT1070,

except for switching frequency (150kHz) and higher

switch current, they can be operated in all standard

switching configurations including buck, boost, flyback,

and inverting. A high current, high efficiency switch is

included on the die along with all oscillator, control, and

protection circuitry. Integration of all functions allows

the LT1268 to be built in standard 5-pin power packages.

This makes it extremely easy to use and provides “bust

proof” operations similar to that obtained with 3-pin

linear regulators.

■

Can Be Externally Synchronized

(See LT1072 Data Sheet)

O U

PPLICATI

■

High Efficiency Boost Converter

PC Power Supply with Multiple Outputs

Battery Upconverter

■

The LT1268 operate with supply voltages from 3.5V to

30V and draw only 7mA quiescent current. By utilizing

current mode switching techniques, it provides excellent

AC and DC load and line regulation.

Negative-to-Positive Converter

USER NOTE:

This data sheet is only intended to provide specifications, graphs, and a general functional

description of the LT1268B/LT1268. Application circuits are included to show the capability of the

LT1268B/LT1268.Acompletedesignmanual(AN19)shouldbeobtainedtoassistindevelopingnew

designs. This manual contains a comprehensive discussion of both the LT1070 and the external

components used with it, as well as complete formulas for calculating the values of these

components. The manual can also be used for the LT1268B/LT1268 factoring in the higher switch

current rating and higher operating frequency.

TheLT1268useanadaptiveanti-satswitchdrivetoallow

verywiderangingloadcurrents withnoloss inefficiency.

An externally activated shutdown mode reduces total

supply current to 100µA typical for standby operation.

TYPICAL APPLICATI

Boost Regulator with 5.3V ±1% Output

Efficiency of 5.3V Boost Converter

MBR1035

100

8µH, 5A*

2µH, 5A**

OUT

4.7V TO

5.3V

5.3V ±1%

3.75A

= 5.3V

D2, D3^†

1N4001

390µF

16V

= 4.7V

0.02

4.043k

0.1%

= 5V

LT1268B FB

CASE GND

220µF

16V

390µF

16V

1.24k

0.1%

0.068

220Ω

LOAD CURRENT (A)

LT1268 • TA01

*COILTRONICS CTX8-5-52

**COILTRONICS CTX2-5-52

^†OPTIONAL. D2 AND D3 ARE USED TO INCREASE

LT1268 • TA02

UNDERVOLTAGE LOCKOUT FROM 2.7V TO ≈4V.

12 3 4

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与LT1268相关器件

型号	品牌	获取价格	描述	数据表
LT1268_15	Linear	获取价格	7.5A, 150kHz Switching Regulators
LT1268B	Linear	获取价格	7.5A, 150kHz Switching Regulators
LT1268B_15	Linear	获取价格	7.5A, 150kHz Switching Regulators
LT1268BCQ	Linear	获取价格	7.5A, 150kHz Switching Regulators
LT1268BCQ#TR	Linear	获取价格	LT1268 - 7.5A, 150kHz Switching Regulators; Package: DD PAK; Pins: 5; Temperature Range: 0
LT1268BCQ#TRPBF	Linear	获取价格	暂无描述
LT1268BCT	Linear	获取价格	7.5A, 150kHz Switching Regulators
LT1268BCT#PBF	Linear	获取价格	LT1268 - 7.5A, 150kHz Switching Regulators; Package: TO-220; Pins: 5; Temperature Range: 0
LT1268CQ	Linear	获取价格	7.5A, 150kHz Switching Regulators
LT1268CQ#PBF	Linear	获取价格	LT1268 - 7.5A, 150kHz Switching Regulators; Package: DD PAK; Pins: 5; Temperature Range: 0

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