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参数资料
| 型号： | LT3973EMSE-5#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 5V 0.75A 10MSOP |
| 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： | 5V |
| 输入电压： | 4.2 V ~ 42 V |
| PWM 型： | 电流模式，Burst Mode? |
| 频率 - 开关： | 195kHz ~ 2.15MHz |
| 电流 - 输出： | 750mA |
| 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 |
LT3973/LT3973-3.3/LT3973-5
42V, 750mA Step-Down
Regulator with 2.5μA
Quiescent Current and
Integrated Diodes
Ultralow Quiescent Current
Low Ripple Burst Mode ? Operation
Wide Input Voltage Range: 4.2V to 42V Operating
Adjustable Switching Frequency: 200kHz to 2.2MHz
Integrated Boost and Catch Diodes
750mA Output Current
Excellent Start-Up and Dropout Performance
Fixed Output Voltages: 3.3V, 5V
Accurate Programmable Undervoltage Lockout
Low Shutdown Current: I Q = 0.75μA
Internal Catch Diode Current Limit
Power Good Flag
Thermal Shutdown
Small, Thermally Enhanced 10-Lead MSOP
Automotive Battery Regulation
Power for Portable Products
Industrial Supplies
Gate Drive Bias
FEATURES
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2.5μA I Q at 12V IN to 3.3V OUT
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Output Ripple < 10mV P-P
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1.9μA I Q at 12V IN
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and (3mm × 3mm) DFN Packages
APPLICATIONS
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DESCRIPTION
The LT ? 3973 is an adjustable frequency monolithic buck
switching regulator that accepts a wide input voltage range
up to 42V, and consumes only 2.5μA of quiescent current.
A high efficiency switch is included on the die along with
the catch diode, boost diode, and the necessary oscillator,
control and logic circuitry. Low ripple Burst Mode operation
maintains high efficiency at low output currents while keep-
ing the output ripple below 10mV in a typical application.
A minimum dropout voltage of 530mV is maintained when
the input voltage drops below the programmed output volt-
age, such as during automotive cold crank. Current mode
topology is used for fast transient response and good loop
stability. A catch diode current limit provides protection
against shorted outputs and overvoltage conditions, with
thermal shutdown providing additional fault protection. An
accurate programmable undervoltage lockout feature is
available, producing a low shutdown current of 0.75μA.
A power good flag signals when V OUT reaches 90% of
the programmed output voltage. The LT3973 is available
in small, thermally enhanced 10-lead MSOP and 3mm ×
3mm DFN packages.
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
5V Step-Down Converter
V IN
5.6V TO 42V
C3
0.47μF
90
80
V IN = 12V
Efficiency
1000
100
OFF ON
V IN BOOST
LT3973
EN/UVLO SW
PG BD
L1
15μH
V OUT
5V
750mA
70
60
10
1
C1
4.7μF
215k
RT
GND
OUT
FB
15pF
1M
316k
C2
22μF
50
0.1
f = 600kHz
3973 TA01a
40
0.01
0.1
1
10
100
0.01
LOAD CURRENT (mA)
3973 TA01b
3973fa
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3973EMSEPBF | 制造商:Linear Technology 功能描述:42V 750mA Buck Regulator 2.5uA MSOP10EP |
| LT3973HDD#PBF | 功能描述:IC REG BUCK ADJ 0.75A 10DFN 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 |
| LT3973HDD#TRPBF | 功能描述:IC REG BUCK ADJ 0.75A 10DFN 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 |
| LT3973HDD-3.3#PBF | 功能描述:IC REG BUCK 3.3V 0.75A 10DFN 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 |
| LT3973HDD-3.3#TRPBF | 功能描述:IC REG BUCK 3.3V 0.75A 10DFN 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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