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| 型号： | LT1268CT#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/4页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK INV FLYBACK TO220-5 |
| 标准包装： | 50 |
| 类型： | 降压（降压），反相，回扫 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.25 V ~ 60 V |
| 输入电压： | 3.5 V ~ 30 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 150kHz |
| 电流 - 输出： | 7.5A |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 125°C |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-220-5 成形引线 |
| 包装： | 管件 |
| 供应商设备封装： | TO-220-5 |
| 产品目录页面： | 1326 (CN2011-ZH PDF) |
LT1268B/LT1268
7.5A, 150kHz
Switching Regulators
FEATURE S
D ESCRIPTIO
s
s
s
s
s
s
s
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
Can Be Externally Synchronized
(See LT1072 Data Sheet)
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.
A PPLICATI
S
This makes it extremely easy to use and provides “bust
proof” operations similar to that obtained with 3-pin
s
s
s
s
High Efficiency Boost Converter
PC Power Supply with Multiple Outputs
Battery Upconverter
Negative-to-Positive Converter
linear regulators.
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
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. A complete design manual (AN19) should be obtained to assist in developing new
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.
TYPICAL A PPLICATI
Boost Regulator with 5.3V ± 1% Output
AC and DC load and line regulation.
The LT1268 use an adaptive anti-sat switch drive to allow
very wide ranging load currents with no loss in efficiency.
An externally activated shutdown mode reduces total
supply current to 100 μ A typical for standby operation.
Efficiency of 5.3V Boost Converter
V IN
L1
8 μ H, 5A*
D1
MBR1035
L2
2 μ H, 5A**
V OUT
100
4.7V TO
5.3V ±1%
5.3V
+
C1
220 μ F
16V
V IN
D2, D3 ?
1N4001
V SW
LT1268B FB
+
C3
390 μ F
16V
C5
0.02
R1
4.043k
0.1%
+
3.75A
C4
390 μ F
16V
90
80
V IN = 4.7V
V IN = 5.3V
V IN = 5V
CASE GND
V C
C2
0.068
R3
220 ?
R2
1.24k
0.1%
70
60
0
1
2
3
4
* COILTRONICS CTX8-5-52
** COILTRONICS CTX2-5-52
?
OPTIONAL. D2 AND D3 ARE USED TO INCREASE
UNDERVOLTAGE LOCKOUT FROM 2.7V TO ≈ 4V.
LT1268 ? TA01
LOAD CURRENT (A)
LT1268 ? TA02
1
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| LT1269 | 制造商:LINER 制造商全称:Linear Technology 功能描述:4A High Efficiency Switching Regulators |
| LT1269CQ | 功能描述:IC REG BUCK INV FLYBACK 4A D2PAK RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT1269CQ#PBF | 功能描述:IC REG BUCK INV FLYBACK 4A D2PAK RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT1269CQ#TR | 功能描述:IC REG BUCK INV FLYBACK 4A D2PAK RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT1269CQ#TRPBF | 功能描述:IC REG BUCK INV FLYBACK 4A D2PAK RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
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