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LT3150CGN Datasheet

  • LT3150CGN

  • Fast Transient Response, Low Input Voltage, Very Low Dropout...

  • 20頁

  • LINER

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LT3150
Fast Transient Response,
Low Input Voltage, Very Low Dropout
Linear Regulator Controller
FEATURES
s
s
s
s
s
DESCRIPTIO
s
s
s
Fast Transient Response Optimized with
Ceramic Output Capacitors
FET R
DS(ON)
Defines Dropout Voltage
鹵1%
Reference Tolerance Over Temperature
Multifunction LDO Shutdown Pin with Latchoff
Fixed Frequency 1.4MHz Boost Converter Generates
MOSFET Gate Drive
Internally Compensated Boost Converter Uses Tiny
Capacitors and Inductor
Independent Boost Converter Shutdown Control
Permits LDO Output Voltage Supply Sequencing
16-Lead SSOP Package
The LT
廬
3150 drives a low cost external N-channel MOSFET
as a source follower to produce a fast transient response,
very low dropout voltage linear regulator. Selection of the
N-channel MOSFET R
DS(ON)
allows dropout voltages below
300mV for low V
IN
to low V
OUT
applications.
The LT3150 includes a fixed frequency boost regulator
that generates gate drive for the N-channel MOSFET. The
internally compensated current mode PWM architecture
combined with the 1.4MHz switching frequency permits
the use of tiny, low cost capacitors and inductors.
The LT3150鈥檚 transient load performance is optimized
with ceramic output capacitors. A precision 1.21V refer-
ence accommodates low voltage supplies.
Protection includes a high side current limit amplifier that
activates a fault timer circuit. A multifunction shutdown
pin provides either current limit time-out with latchoff,
overvoltage protection or thermal shutdown. Independent
shutdown control of the boost converter provides on/off
and sequencing control of the LDO output voltage.
APPLICATIO S
s
s
s
Microprocessor, ASIC and I/O Supplies
Very Low Dropout Input-to-Output Conversion
Logic Termination Supplies
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
MBR0520L
1.8V to 1.5V, 4A Very Low Dropout Linear Regulator
(Typical Dropout Voltage = 65mV at I
OUT
= 4A)
+
C1
4.7碌F
6.19k
1%
1.37k
1%
LT3150
V
IN2
SW
FB1
V
IN1
SHDN2 SHDN1
I
POS
SWGND
I
NEG
GND
GATE
GND
FB2
COMP
L1
10碌H
50mV/DIV
5.1鈩?/div>
Si4410
243鈩?/div>
1%
50pF
1020鈩?/div>
1%
+
C
IN
220碌F
2.5V
脳2
V
IN
1.8V
2A/DIV
V
OUT
1.5V
4A
3150 TA02
1.5k
6800pF
2.2碌F
脳10
X5R CERAMIC
0805 CASE
C
IN
: PANASONIC SP SERIES EEFUE0E221R 20%
C1: AVX TAJA475M020R 20V 20%
L1: MURATA LQH32CN100K11 OR SUMIDA CDRH3D16100
3150 TA01
U
Transient Response for
0.1A to 4A Output Load Step
20碌s/DIV
3150f
U
U
1

LT3150CGN 產(chǎn)品屬性

  • LT3150

  • More Information on LDOs

  • 100

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - 線性晶體管驅(qū)動(dòng)器

  • -

  • 正，可調(diào)式

  • 1

  • 2.5 V ~ 18.4 V

  • 12mA

  • 1.5 V ~ 10 V，10 V ~ 20 V

  • 0°C ~ 70°C

  • 16-SSOP（0.154"，3.90mm 寬）

  • 16-SSOP

  • 管件

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