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参数资料
| 型号： | LT1938IDD#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 4 A SWITCHING REGULATOR, 3300 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | 3 X 3 MM, LEAD FREE, PLASTIC, MO-229WEED-2, DFN-10 |
| 文件页数： | 1/24页 |
| 文件大小： | 260K |
| 代理商： | LT1938IDD#PBF |
LT1938
1
1938fa
25V, 2.2A, 2.8MHz
Step-Down
Switching Regulator
The LT1938 is an adjustable frequency (300kHz to
2.8MHz) monolithic buck switching regulator that accepts
input voltages up to 25V. A high efficiency 0.18Ω 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. The LT1938’s high operating fre-
quency allows the use of small, low cost inductors and
ceramic capacitors resulting in low output ripple while
keeping total solution size to a minimum. The low current
shutdown mode reduces input supply current to less than
1A while a resistor and capacitor on the RUN/SS pin
provide a controlled output voltage ramp (soft-start). A
power good flag signals when VOUT reaches 90% of the
programmed output voltage. The LT1938 is available in
a 3mm × 3mm DFN package with Exposed Pad for low
thermal resistance.
■
Automotive Battery Regulation
■
Power for Portable Products
■
Distributed Supply Regulation
■
Industrial Supplies
■
Wall Transformer Regulation
■
Wide Input Voltage Range: 3.6V to 25V
■
2.2A Maximum Output Current
■
Adjustable Switching Frequency: 300kHz to 2.8MHz
■
Low Shutdown Current: IQ < 1A
■
Integrated Boost Diode
■
Power Good Flag
■
Saturating Switch Design: 0.18Ω On-Resistance
■
1.265V Feedback Reference Voltage
■
Output Voltage: 1.265V to 20V
■
Soft-Start Capability
■
Small 10-Pin Thermally Enhanced (3mm × 3mm)
DFN Package
3.3V Step-Down Converter
Efficiency (VOUT = 3.3V)
FEATURES
DESCRIPTION
APPLICATIONS
TYPICAL APPLICATION
SW
BIAS
FB
VC
PG
RT
VIN
BD
VIN
4.5V TO
25V
VOUT
3.3V
2.2A
4.7F
0.47F
680pF
22F
200k
16.2k
60.4k
4.7H
324k
GND
OFF ON
LT1938
1938 TA01
RUN/SS
BOOST
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
LOAD CURRENT (A)
0
EFFICIENCY
(%)
70
75
80
85
90
1.6
1938 G02
65
60
55
50
0.2 0.4 0.6 0.8 1.0 1.2 1.4
1.8
2.2
2.0
VIN = 12V
VIN = 7V
VIN = 24V
L: NEC PLC-0745-4R7
f = 800kHz
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1939 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller |
| LT1939EDD#PBF | 功能描述:IC REG DL BUCK/LINEAR 12DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| LT1939EDD#TRPBF | 功能描述:IC REG DL BUCK/LINEAR 12DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| LT1939EDD-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller |
| LT1939EDD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller |
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