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| 型号： | LT3971IMSE-3.3#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 3.3V 1.2A 10-MSOP |
| 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： | 3.3V |
| 输入电压： | 4.3 V ~ 38 V |
| PWM 型： | 电流模式，Burst Mode? |
| 频率 - 开关： | 200kHz ~ 2MHz |
| 电流 - 输出： | 1.2A |
| 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-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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LT3971/LT3971-3.3/LT3971-5
38V, 1.2A, 2MHz
Step-Down Regulator with
2.8μA Quiescent Current
Ultralow Quiescent Current:
Fixed Output Voltages: 3.3V, 5V,
Low Ripple Burst Mode ? Operation:
Wide Input Voltage Range: 4.3V to 38V
1.2A Maximum Output Current
Adjustable Switching Frequency: 200kHz to 2MHz
Synchronizable Between 250kHz to 2MHz
Fast Transient Response
Accurate 1V Enable Pin Threshold
Low Shutdown Current: I Q = 700nA
Power Good Flag
Soft-Start Capability
Internal Compensation
Output Voltage: 1.19V to 30V
Small Thermally Enhanced 10-Lead MSOP, 16-Lead
Automotive Battery Regulation
Power for Portable Products
Industrial Supplies
FEATURES
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2.8μA I Q Regulating 12V IN to 3.3V OUT
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2.1μA I Q Regulating 12V IN to 3.3V OUT
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Output Ripple < 15mV P-P
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MSOP and (3mm × 3mm) DFN Packages
APPLICATIONS
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DESCRIPTION
The LT ? 3971 is an adjustable frequency monolithic buck
switching regulator that accepts a wide input voltage range
up to 38V. Low quiescent current design consumes only
2.8μA of supply current while regulating with no load. Low
ripple Burst Mode operation maintains high efficiency at
low output currents while keeping the output ripple below
15mV in a typical application. An internally compensated
current mode topology is used for fast transient response
and good loop stability. A high efficiency 0.33Ω switch
is included on the die along with a boost Schottky diode
and the necessary oscillator, control and logic circuitry.
An accurate 1V threshold enable pin can be used to shut
down the LT3971, reducing the input supply current to
700nA. A capacitor on the SS pin provides a controlled
inrush current (soft-start). A power good flag signals
when V OUT reaches 91% of the programmed output volt-
age. The LT3971 is available in small 10-lead MSOP and
3mm × 3mm DFN packages with exposed pads for low
thermal resistance. A 16-lead MSOP is also offered which
has enhanced pin-to-pin fault tolerance.
L , LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
TYPICAL APPLICATION
3.3V Step Down Converter
V IN
4.5V TO 38V
3.0
No Load Supply Current
OUTPUT IN REGULATION
V IN
OFF ON
4.7μF
EN
PG
SS
RT
BOOST
SW
LT3971-3.3
0.47μF
4.7μH
2.5
2.0
LT3971-5
LT3971-3.3
49.9k
f = 800kHz
SYNC
GND
BD
V OUT
22μF
V OUT
3.3V
1.2A
1.5
3971 TA01
1.0
5
10
15
20
25
30
35
INPUT VOLTAGE (V)
3971 TA01b
3971fd
1
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相关代理商/技术参数 |
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| LT3971IMSE-5#PBF | 功能描述:IC REG BUCK 5V 1.2A 10-MSOP 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 |
| LT3971IMSE-5#TRPBF | 功能描述:IC REG BUCK 5V 1.2A 10-MSOP 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 |
| LT3971IMSEPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:38V, 1.2A, 2MHz Step-Down Regulator with 2.8 Quiescent Current |
| LT3971IMSETRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:38V, 1.2A, 2MHz Step-Down Regulator with 2.8 Quiescent Current |
| LT3972 | 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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