LTC3418EUHF Ver la hoja de datos (PDF) - Linear Technology
Número de pieza
componentes Descripción
Fabricante
LTC3418EUHF Datasheet PDF : 20 Pages
| |||
FEATURES
n High Efficiency: Up to 95%
n 8A Output Current
n 2.25V to 5.5V Input Voltage Range
n Low RDS(ON) Internal Switch: 35mΩ
n Tracking Input to Provide Easy Supply Sequencing
n Programmable Frequency: 300kHz to 4MHz
n 0.8V ±1% Reference Allows Low Output Voltage
n Quiescent Current: 380μA
n Selectable Forced Continuous/Burst Mode® Operation
with Adjustable Burst Clamp
n Synchronizable Switching Frequency
n Low Dropout Operation: 100% Duty Cycle
n Power Good Output Voltage Monitor
n Overtemperature Protected
n 38-Lead Low Profile (0.75mm) Thermally Enhanced
QFN (5mm × 7mm) Package
APPLICATIONS
n Microprocessor, DSP and Memory Supplies
n Distributed 2.5V, 3.3V and 5V Power Systems
n Automotive Applications
n Point of Load Regulation
n Notebook Computers
LTC3418
8A, 4MHz, Monolithic
Synchronous Step-Down
Regulator
DESCRIPTION
The LTC®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® 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 con-
tinuous operation reduces noise and RF interference
while Burst Mode operation provides high efficiency by
reducing 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.
L, LT, LTC and LTM 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.
TYPICAL APPLICATION
2.5V/8A Step-Down Regulator
VIN
2.8V TO 5.5V
2.2M
1000pF
30.1k
4.99k
SVIN TRACK PVIN
RT
SW
LTC3418
PGOOD
RUN/SS PGND
ITH
SGND
SYNC/MODE VFB
820pF
332Ω 4.32k
1.69k
CIN
47μF
×4 0.2μH
VOUT
2.5V
COUT 8A
100μF
×2
3418 TA01a
Efficiency and Power Loss vs Load Current
100
100000
90
EFFICIENCY
80
10000
70
60
POWER LOSS
50
1000
100
40
30
20
0.01
10
VIN = 3.3V
VOUT = 2.5V
1
0.1
1
10
LOAD CURRENT (A)
3418 TA01b
3418fb
1
Share Link: 