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参数资料
| 型号： | LTC1938IDD#TRPBF |
| 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： | 272K |
| 代理商： | LTC1938IDD#TRPBF |
LT1938
1
1938f
25V, 2.2A, 2.8MHz
Step-Down
Switching Regulator
The LT
1938 is an adjustable frequency (300kHz to
2.8MHz) monolithic buck switching regulator that accepts
input voltages up to 25V. A high efciency 0.18
Ω 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
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 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 < 1μA
■ Integrated Boost Diode
■ Power Good Flag
■ Saturating Switch Design: 0.18
Ω 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
Efciency (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
4.7
μF
0.47
μF
680pF
22
μF
200k
16.2k
60.4k
4.7
μH
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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