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参数资料
| 型号： | LT3430IFE-1 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 6.5 A SWITCHING REGULATOR, 120 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | 4.40 MM, PLASTIC, TSSOP-16 |
| 文件页数： | 26/28页 |
| 文件大小： | 321K |
| 代理商： | LT3430IFE-1 |
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LT3430/LT3430-1
7
34301fa
BLOCK DIAGRAM
The LT3430/LT3430-1 are constant frequency, current
mode buck converters. This means that there is an in-
ternal clock and two feedback loops that control the duty
cycle of the power switch. In addition to the normal error
amplier, there is a current sense amplier that monitors
switch current on a cycle-by-cycle basis. A switch cycle
starts with an oscillator pulse which sets the RS ip-op
to turn the switch on. When switch current reaches a level
set by the inverting input of the comparator, the ip-op
is reset and the switch turns off. Output voltage control is
obtained by using the output of the error amplier to set
the switch current trip point. This technique means that the
error amplier commands current to be delivered to the
output rather than voltage. A voltage fed system will have
low phase shift up to the resonant frequency of the inductor
and output capacitor, then an abrupt 180° shift will occur.
The current fed system will have 90° phase shift at a much
lower frequency, but will not have the additional 90° shift
until well beyond the LC resonant frequency. This makes
it much easier to frequency compensate the feedback loop
and also gives much quicker transient response.
Most of the circuitry of the LT3430/LT3430-1 operates
from an internal 2.9V bias line. The bias regulator normally
draws power from the regulator input pin, but if the BIAS
pin is connected to an external voltage equal to or higher
than 3V, bias power will be drawn from the external source
(typically the regulated output voltage). This will improve
efciency if the BIAS pin voltage is lower than regulator
input voltage.
High switch efciency is attained by using the BOOST pin
to provide a voltage to the switch driver which is higher
than the input voltage, allowing switch to be saturated.
This boosted voltage is generated with an external ca-
pacitor and diode. Two comparators are connected to the
shutdown pin. One has a 2.38V threshold for undervoltage
lockout and the second has a 0.4V threshold for complete
shutdown.
–
+
–
+
–
+
–
+
Σ
VIN
3, 4
2.9V BIAS
REGULATOR
200kHz: LT3430
100kHz: LT3430-1
OSCILLATOR
FREQUENCY
FOLDBACK
2, 5
FB
SW
GND
1, 8, 9, 16, 17
3430 F01
SLOPE COMP
ANTISLOPE COMP
BIAS
INTERNAL
VCC
SYNC
0.4V
5.5
A
CURRENT
COMPARATOR
RLIMIT
RSENSE
ERROR
AMPLIFIER
gm = 2000Mho
Q2
FOLDBACK
CURRENT
LIMIT
CLAMP
BOOST
RS
FLIP-FLOP
DRIVER
CIRCUITRY
S
R
Q1
POWER
SWITCH
1.22V
10
14
SHDN 15
6
12
相关PDF资料 |
PDF描述 |
|---|---|
| LT3430EFE-1 | 6.5 A SWITCHING REGULATOR, 120 kHz SWITCHING FREQ-MAX, PDSO16 |
| LT3467AIDDB#PBF | 2.5 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO8 |
| LT3467AIDDB | 2.5 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO8 |
| LT3467IS6#TRM | 2.5 A SWITCHING REGULATOR, 1600 kHz SWITCHING FREQ-MAX, PDSO6 |
| LT3467IS6#TR | 2.5 A SWITCHING REGULATOR, 1600 kHz SWITCHING FREQ-MAX, PDSO6 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3430IFE-1#PBF | 功能描述:IC REG BUCK ADJ 3A 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:MIC23xxx HyperLight Load™ Regulators 标准包装:5,000 系列:HyperLight Load® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.8V 输入电压:2.7 V ~ 5.5 V PWM 型:混合物 频率 - 开关:4MHz 电流 - 输出:2A 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:8-VFDFN 裸露焊盘，8-MLF? 包装:带卷 (TR) 供应商设备封装:8-MLF?（2x2） 产品目录页面:1094 (CN2011-ZH PDF) 其它名称:576-3303-2 |
| LT3430IFE-1#TRPBF | 功能描述:IC REG BUCK ADJ 3A 16TSSOP 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 |
| LT3430IFEPBF | 制造商:Linear Technology 功能描述:Sw. Regulator 3A 200kHz 60V TSSOP16EP |
| LT3431 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage, 3A,500kHz Step-Down Switching Regulator |
| LT3431EFE | 功能描述:IC REG BUCK ADJ 3A 16TSSOP 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 |
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