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| 型号： | LT3972IDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3.5A 10DFN |
| 标准包装： | 121 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.79 V ~ 30 V |
| 输入电压： | 3.6 V ~ 33 V |
| PWM 型： | 电流模式，Burst Mode? |
| 频率 - 开关： | 230kHz ~ 2.45MHz |
| 电流 - 输出： | 3.5A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 10-DFN（3x3） |
LT3972
33V, 3.5A, 2.4MHz
Step-Down Switching Regulator
with 75μA Quiescent Current
FEATURES
DESCRIPTION
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Wide Input Range:
Operation from 3.6V to 33V
Overvoltage Lockout Protects Circuits
Through 62V Transients
3.5A Maximum Output Current
Low Ripple (<15mV P-P ) Burst Mode ? Operation:
I Q = 75μA at 12V IN to 3.3V OUT
Adjustable Switching Frequency: 200kHz to 2.4MHz
Low Shutdown Current: I Q < 1μA
Integrated Boost Diode
Synchronizable Between 250kHz to 2MHz
Power Good Flag
Saturating Switch Design: 95mΩ On-Resistance
Output Voltage: 0.79V to 30V
Thermal Protection
Soft-Start Capability
Small 10-Pin Thermally Enhanced MSOP and
(3mm × 3mm) DFN Packages
The LT ? 3972 is an adjustable frequency (200kHz to 2.4MHz)
monolithic buck switching regulator that accepts input
voltages up to 33V (62V maximum). A high ef?ciency
95mΩ switch is included on the die along with a boost
Schottky diode and the necessary oscillator, control and
logic circuitry. Current mode topology is used for fast
transient response and good loop stability. Low ripple
Burst Mode operation maintains high ef?ciency at low
output currents while keeping output ripple below 15mV
in a typical application. In addition, the LT3972 can fur-
ther enhance low output current ef?ciency by drawing
bias current from the output when V OUT is above 3V.
Shutdown reduces input supply current to less than 1μA
while a resistor and capacitor on the RUN/SS pin provide a
controlled output voltage ramp (soft-start). A power good
?ag signals when V OUT reaches 91% of the programmed
output voltage. The LT3972 is available in 10-pin MSOP
and 3mm × 3mm DFN packages with exposed pads for
APPLICATIONS
low thermal resistance.
L , LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered
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Automotive Battery Regulation
Distributed Supply Regulation
Industrial Supplies
Wall Transformer Regulation
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
TYPICAL APPLICATION
5V Step-Down Converter
Ef?ciency
V IN
6.3V TO 33V
TRANSIENT
TO 62V
10μF
OFF ON
15k
V IN
RUN/SS
V C
LT3972
BD
BOOST
SW
0.47μF 4.7μH
V OUT
5V
3.5A
100
90
80
70
V IN = 12V
V IN = 30V
V IN = 24V
680pF
RT
63.4k
PG
SYNC
GND
FB
536k
60
V OUT = 5V
L = 4.7 μ H
f = 600kHz
100k
47μF
50
0
0.5
1
1.5
2
2.5
3
3.5
OUTPUT CURRENT (A)
3972 TA01
3972 TA01a
3972fa
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3972IDD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:33V, 3.5A, 2.4MHz Step-Down Switching Regulator with 75μA Quiescent Current |
| LT3972IMSE#PBF | 功能描述:IC REG BUCK ADJ 3.5A 10MSOP 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 |
| LT3972IMSE#TRPBF | 功能描述:IC REG BUCK ADJ 3.5A 10MSOP 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 |
| LT3972IMSEPBF | 制造商:Linear Technology 功能描述:DC-DC Converter Step-Down 3.6-33V MSOP10 |
| LT3972IMSE-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:33V, 3.5A, 2.4MHz Step-Down Switching Regulator with 75μA Quiescent Current |
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