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LTC3418EUHF Datasheet

  • LTC3418EUHF

  • 8A, 4MHz, Monolithic Synchronous Step-Down Regulator

  • 20頁(yè)

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LTC3418
8A, 4MHz, Monolithic
Synchronous Step-Down
Regulator
DESCRIPTIO
The LTC
廬
3418 is a high efficiency, monolithic synchro-
nous step-down DC/DC converter utilizing a constant
frequency, current mode architecture. It operates from an
input voltage range of 2.25V to 5.5V and provides a
regulated output voltage from 0.8V to 5V while delivering
up to 8A of output current. The internal synchronous
power switch increases efficiency and eliminates the need
for an external Schottky diode. Switching frequency is set
by an external resistor or can be synchronized to an
external clock. OPTI-LOOP
廬
compensation allows the
transient response to be optimized over a wide range of
loads and output capacitors.
The LTC3418 can be configured for either Burst Mode
operation or forced continuous operation. Forced continu-
ous operation reduces noise and RF interference while
Burst Mode operation provides high efficiency by reduc-
ing gate charge losses at light loads. In Burst Mode
operation, external control of the burst clamp level allows
the output voltage ripple to be adjusted according to the
requirements of the application. A tracking input in the
LTC3418 allows for proper sequencing with respect to
another power supply.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode and OPTI-LOOP are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 5481178, 6580258, 6304066, 6127815, 6498466, 6611131,
6724174.
FEATURES
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High Efficiency: Up to 95%
8A Output Current
2.25V to 5.5V Input Voltage Range
Low R
DS(ON)
Internal Switch: 35m鈩?/div>
Tracking Input to Provide Easy Supply Sequencing
Programmable Frequency: 300kHz to 4MHz
0.8V
鹵1%
Reference Allows Low Output Voltage
Quiescent Current: 380碌A(chǔ)
Selectable Forced Continuous/Burst Mode
廬
Operation
with Adjustable Burst Clamp
Synchronizable Switching Frequency
Low Dropout Operation: 100% Duty Cycle
Power Good Output Voltage Monitor
Overtemperature Protected
38-Lead Low Profile (0.75mm) Thermally Enhanced
QFN (5mm
脳
7mm) Package
APPLICATIO S
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Microprocessor, DSP and Memory Supplies
Distributed 2.5V, 3.3V and 5V Power Systems
Automotive Applications
Point of Load Regulation
Notebook Computers
TYPICAL APPLICATIO
V
IN
2.8V TO 5.5V
Efficiency and Power Loss vs Load Current
100
90
EFFICIENCY
100000
2.5V/8A Step-Down Regulator
C
IN
100碌F
0.2碌H
C
OUT
100碌F
脳2
SV
IN
TRACK PV
IN
R
T
2.2M
30.1k
SW
LTC3418
PGOOD
PGND
RUN/SS
SGND
I
TH
SYNC/MODE V
FB
332鈩?/div>
1.69k
4.32k
EFFICIENCY (%)
V
OUT
2.5V
8A
80
70
60
50
40
30
V
IN
= 3.3V
V
OUT
= 2.5V
0.1
1
LOAD CURRENT (A)
10
3418 TA01b
1000pF
4.99k
820pF
3418 TA01a
20
0.01
U
U
U
10000
POWER LOSS (mW)
1000
POWER LOSS
100
10
1
3418f
1

LTC3418EUHF 產(chǎn)品屬性

  • 0現(xiàn)貨

  • 停產(chǎn)

  • -

  • 管件

  • 停產(chǎn)

  • 降壓

  • 正

  • 可調(diào)式

  • 1

  • 2.25V

  • 5.5V

  • 0.8V

  • 5V

  • 8A

  • 1MHz

  • 是

  • -40°C ~ 85°C

  • 表面貼裝型

  • 38-WFQFN 裸露焊盤

  • 38-QFN（5x7）

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