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3412AEFE Просмотр технического описания (PDF) - Linear Technology

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3412AEFE Datasheet PDF : 20 Pages
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LTC3412A
3A, 4MHz, Monolithic
Synchronous Step-Down Regulator
FEATURES
High Efficiency: Up to 95%
3A Output Current
Low Quiescent Current: 64μA
Low RDS(ON) Internal Switch: 77mΩ
2.25V to 5.5V Input Voltage Range
Programmable Frequency: 300KHz to 4MHz
±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 16-Lead Exposed Pad TSSOP and
QFN Packages
U
APPLICATIO S
Point-of-Load Regulation
Notebook Computers
Portable Instruments
Distributed Power Systems
DESCRIPTIO
The LTC®3412A 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 deliver-
ing up to 3A of output current. The internal synchronous
power switch with 77mΩ on-resistance 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. 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 LTC3412A 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 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 application
requirements.
, 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 APPLICATIO
22μF
VIN
3.3V
2.2M
294k
PVIN SVIN
RT
PGOOD
LTC3412A
SW
1000pF
820pF
12.1k
RUN/SS PGND
ITH
SGND
SYNC/MODE VFB
69.8k
115k
0.47μH
392k
VOUT
2.5V AT 3A
COUT
100μF
×2
3412A F01a
Figure 1. 2.5V/3A Step-Down Regulator
Efficiency and Power Loss
100
95
90
85
80
75
70
65
60
55
50
0.01
EFFICIENCY
POWER LOSS
0.1
1
LOAD CURRENT (A)
100000
10000
1000
100
10
1
10
3412A F01b
3412afc
1

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