參數(shù)資料
型號(hào)： LTC3414MPFE#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 9.5 A SWITCHING REGULATOR, 4000 kHz SWITCHING FREQ-MAX, PDSO20
封裝： 4.40 MM, LEAD FREE, PLASTIC, TSSOP-20
文件頁(yè)數(shù)： 1/16頁(yè)
文件大小： 268K
代理商： LTC3414MPFE#PBF
LTC3414
1
3414fb
■ Point-of-Load Regulation
■ Notebook Computers
■ Portable Instruments
■ Distributed Power Systems
■ High Efficiency: Up to 95%
■
4A Output Current
■ Low Quiescent Current: 64
μA
■ Low RDS(ON) Internal Switch: 67mΩ
■
Programmable Frequency: 300KHz to 4MHz
■ 2.25V to 5.5V Input Voltage Range
■
±2% Output Voltage Accuracy
■
0.8V Reference Allows Low Output Voltage
■ Selectable Forced Continuous/Burst Mode
Operation
with Adjustable Burst Clamp
■
Synchronizable Switching Frequency
■ Low Dropout Operation: 100% Duty Cycle
■ Power Good Output Voltage Monitor
■
Overtemperature Protected
■ Available in 20-Lead Exposed TSSOP Package
4A, 4MHz, Monolithic
Synchronous Step-Down Regulator
The LTC
3414 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 4A of output current. The internal synchronous
power switch with 67m
Ω on-resistance increases effi-
ciency 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. 100% duty cycle
provides low dropout operation extending battery life in
portable systems. OPTI-LOOP
compensation allows the
transient response to be optimized over a wide range of
loads and output capacitors.
The LTC3414 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.
3414 F01a
SYNC/MODE
VFB
PGOOD
SW
PGND
SGND
RT
RUN/SS
ITH
SVIN
PVIN
LTC3414
294k
22
μF
COUT*
0.47
μH
VOUT
2.5V AT 4A
VIN
2.7V TO 5.5V
1000pF
2.2M
470pF
RITH*
75k
110k
392k
*Burst Mode OPERATION: COUT = 470μF SANYO POSCAP 4TPB470M, RITH = 20k
FORCED CONTINUOUS: COUT = (2) 100μF TDKC4532X5ROJ107M, RITH = 12.1k
LTC3414 Efficiency Curve
Figure 1. 2.5V/4A Step-Down Regulator
LOAD CURRENT (A)
EFFICIENCY
(%)
100
95
90
85
80
75
70
65
60
55
50
0.001
0.1
1.0
10
3414 F01b
0.01
Burst Mode OPERATION
FORCED
CONTINUOUS
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
, 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
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