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| 型号： | LT1578CS8-2.5#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 28/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 2.5V 1.5A 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 2.5V |
| 输入电压： | 4 V ~ 15 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz |
| 电流 - 输出： | 1.5A |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
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LT1578/LT1578-2.5
TYPICAL APPLICATIO N
Dual Output SEPIC Converter
The circuit in Figure 17 generates both positive and
negative 5V outputs with a single piece of magnetics. The
inductor L1 is a 33 μ H surface mount inductor from
Coiltronics. It is manufactured with two identical windings
that can be connected in series or parallel. The topology for
the 5V output is a standard buck converter. The – 5V
topology would be a simple flyback winding coupled to the
buck converter if C4 were not present. C4 creates the
SEPIC (Single-Ended Primary Inductance Converter) to-
pology which improves regulation and reduces ripple
current in L1. Without C4, the voltage swing on L1B
compared to L1A would vary due to relative loading and
coupling losses. C4 provides a low impedance path to
maintain an equal voltage swing in L1B, improving regu-
lation. In a flyback converter, during switch on time, all the
converter’s energy is stored in L1A only, since no current
flows in L1B. At switch off, energy is transferred by
magnetic coupling into L1B, powering the – 5V rail. C4
pulls L1B positive during switch on time, causing current
to flow, and energy to build in L1B and C4. At switch off,
the energy stored in both L1B and C4 supply the – 5V rail.
This reduces the current in L1A and changes L1B current
waveform from square to triangular. For details on this
circuit see Design Note 100.
INPUT
6V TO 15V
+
V IN
SHDN
C3
22 μ F
35V TANT
BOOST
LT1578
GND V C
C2
0.33 μ F
V SW
FB
C C
100pF
D2
1N914
L1A*
33 μ H
R1
15.8k
+
R2
4.99k
D1
1N5818
C1**
100 μ F
10V TANT
OUTPUT
5V
GND
* L1 IS A SINGLE CORE WITH TWO WINDINGS
COILTRONICS CTX33-2
** AVX TSPD107M010
? IF LOAD CAN GO TO ZERO, AN OPTIONAL
PRELOAD OF 1k TO 5k MAY BE USED TO
C4**
100 μ F
+
L1B* D3
1N5818
+
C5**
100 μ F
10V TANT
OUTPUT
–5V ?
RELATED PARTS
IMPROVE LOAD REGULATION
Figure 17. Dual Output SEPIC Converter
1578 F17
PART NUMBER
LT1074/LT1076
LTC1174
LT1370
LT1371
DESCRIPTION
Step-Down Switching Regulators
High Efficiency Step-Down and Inverting DC/DC Converter
High Efficiency DC/DC Converter
High Efficiency DC/DC Converter
COMMENTS
40V Input, 100kHz, 5A and 2A
0.5A, 150kHz Burst Mode TM Operation
42V, 6A, 500kHz Switch
35V, 3A, 500kHz Switch
LT1372/LT1377
500kHz and 1MHz High Efficiency 1.5A Switching Regulators Boost Topology
LT1376
LT1507
LT1676/LT1776
LTC1772
LTC1735
LT1777
High Efficiency Step-Down Switching Regulator
High Efficiency Step-Down Switching Regulator
High Efficiency Step-Down Switching Regulators
SOT-23 Low Voltage Step-Down DC/DC Controller
High Efficiency Step-Down Converter
Low Noise Step-Down Switching Regulator
25V, 1.5A, 500kHz Switch
15V, 1.5A, 500kHz Switch
7.4V to 60V Input, 100kHz/200kHz
550kHz, Drives PFET, 6-Lead SOT-23 Package; up to 4.5A Output Current
Synchronous Buck Controller Drives External MOSFETs
48V Input, Internally Limited dV/dt, Programmable di/dt
Burst Mode is a trademark of Linear Technology Corporation.
28
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 q FAX: (408) 434-0507 q www.linear-tech.com
1578f LT/TP 0100 4K ? PRINTED IN USA
? LINEAR TECHNOLOGY CORPORATION 1999
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相关代理商/技术参数 |
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|---|---|
| LT1578I | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.5A, 200kHz Step-Down Switching Regulator |
| LT1578IS8 | 功能描述:IC REG BUCK ADJ 1.5A 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT1578IS8#PBF | 功能描述:IC REG BUCK ADJ 1.5A 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT1578IS8#TR | 功能描述:IC REG BUCK ADJ 1.5A 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT1578IS8#TRPBF | 功能描述:IC REG BUCK ADJ 1.5A 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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