参数资料
型号: LT1375CS8#PBF
厂商: Linear Technology
文件页数: 26/28页
文件大小: 0K
描述: IC REG BUCK ADJ 1.5A 8SOIC
标准包装: 100
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 2.42 V ~ 21.5 V
输入电压: 5 V ~ 25 V
PWM 型: 电流模式
频率 - 开关: 500kHz
电流 - 输出: 1.5A
同步整流器:
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: 管件
供应商设备封装: 8-SOIC
产品目录页面: 1327 (CN2011-ZH PDF)
LT1375/LT1376
APPLICATIO N S I N FOR M ATIO N
2 ( )( ) ( )
L f V + V
V
2 ( )( )
I V
( )( ) f
surface  mount  solid  tantalum  capacitor,  but  the  final
capacitor chosen must be looked at carefully for ESR
characteristics.
Ripple Current in the Input and Output Capacitors
Positive-to-negative converters have high ripple current in
both the input and output capacitors. For long capacitor
lifetime, the RMS value of this current must be less than
the high frequency ripple current rating of the capacitor.
The following formula will give an approximate value for
RMS ripple current. This formula assumes continuous
mode and large inductor value. Small inductors will give
somewhat higher ripple current, especially in discontinu-
ous mode. The exact formulas are very complex and
appear in Application Note 44, pages 30 and 31. For our
purposes here I have simply added a fudge factor (ff). The
value for ff is about 1.2 for higher load currents and
L ≥ 10 μ H. It increases to about 2.0 for smaller inductors at
lower load currents.
Peak diode current:
Continuous Mode =
( V IN + V OUT ) + ( V IN )( V OUT )
I OUT
IN IN OUT
OUT OUT
Discontinuous Mode =
L
Keep in mind that during start-up and output overloads,
average diode current may be much higher than with
normal loads. Care should be used if diodes rated less than
1A are used, especially if continuous overload conditions
must be tolerated.
Dual Output SEPIC Converter
The circuit in Figure 20 generates both positive and
negative 5V outputs with a single piece of magnetics. The
Capacitor I RMS = ( ff )( I OUT )
V OUT
V IN
two inductors shown are actually just two windings on a
standard Coiltronics inductor. The topology for the 5V
output is a standard buck converter. The – 5V topology
ff = Fudge factor 1 (1.2 to 2.0)
Diode Current
Average diode current is equal to load current. Peak diode
current will be considerably higher.
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) topology
which improves regulation and reduces ripple current in
L1. For details on this circuit see Design Note 100.
D2
1N914
INPUT
6V TO 25V
V IN
BOOST
V SW
LT1376-5 BIAS
C2
0.1 μ F
L1*
10 μ H
OUTPUT
5V
SHDN
SENSE
+
C3
22 μ F
35V TANT
GND
V C
R C
470 ?
D1
+
C1**
100 μ F
10V TANT
GND
C C
0.01 μ F
1N5818
* L1 IS A SINGLE CORE WITH TWO WINDINGS
COILTRONICS #CTX10-2P
** AVX TPSD107M010
? IF LOAD CAN GO TO ZERO, AN OPTIONAL
PRELOAD OF 1k TO 5k MAY BE USED TO
C4**
100 μ F
10V TANT
+
L1*
D3
1N5818
+
C5**
100 μ F
10V TANT
OUTPUT
–5V ?
IMPROVE LOAD REGULATION
1375/76 F20
Figure 20. Dual Output SEPIC Converter
1 Normally, Jamoca Almond
13756fd
26
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LT1375HVCS8 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
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