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LTC3412AEFE Datasheet

Monolithic Synchronous Step-Down Regulator

No Preview Available !

FEATURES
n High Efficiency: Up to 95%
n 3A Output Current
n Low Quiescent Current: 64µA
n Low RDS(ON) Internal Switch: 77mΩ
n 2.25V to 5.5V Input Voltage Range
n Programmable Frequency: 300kHz to 4MHz
n ±2% Output Voltage Accuracy
n 0.8V Reference Allows Low Output Voltage
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 Available in 16-Lead Exposed Pad TSSOP and
QFN Packages
APPLICATIONS
n Point-of-Load Regulation
n Notebook Computers
n Portable Instruments
n Distributed Power Systems
LTC3412A
3A, 4MHz, Monolithic
Synchronous
Step-Down Regulator
DESCRIPTION
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.
L, LT, LTC, LTM, Burst Mode, OPTI-LOOP, Linear Technology and the Linear logo are registered
trademarks and ThinSOT is a trademark of Analog Devices, Inc. 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
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
For more information www.linear.com/LTC3412A
3412aff
1


Analog Devices Semiconductor Electronic Components Datasheet

LTC3412AEFE Datasheet

Monolithic Synchronous Step-Down Regulator

No Preview Available !

LTC3412A
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage..................................... –0.3V to 6V
ITH, RUN/SS, VFB, PGOOD,
SYNC/MODE Voltages.....................................–0.3 to VIN
SW Voltages...................................–0.3V to (VIN + 0.3V)
Operating Junction Temperature Range (Notes 2, 5)
E-, I-Grades........................................– 40°C to 125°C
MP-Grade...........................................– 55°C to 125°C
Storage Temperature Range.....................–65°C to150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
PIN CONFIGURATION
TOP VIEW
SVIN 1
PGOOD 2
16 PVIN
15 SW
ITH 3
14 SW
VFB 4
17
13 PGND
RT 5
12 PGND
SYNC/MODE 6
11 SW
RUN/SS 7
10 SW
SGND 8
9 PVIN
FE PACKAGE
16-LEAD PLASTIC TSSOP
TJMAX = 125°C, θJA = 38°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 17) IS SGND, MUST BE SOLDERED TO PCB
TOP VIEW
16 15 14 13
RUN/SS 1
12 PGOOD
SGND 2
PVIN 3
SW 4
17
11 SVIN
10 PVIN
9 SW
5678
UF PACKAGE
16-LEAD (4mm × 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 37°C/W, θJC = 5°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE CONNECTED TO PCB
ORDER INFORMATION http://www.linear.com/product/LTC3412A#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3412AEFE#PBF
LTC3412AEFE#TRPBF 3412AEFE
16-Lead Plastic TSSOP
–40°C to 125°C
LTC3412AIFE#PBF
LTC3412AIFE#TRPBF 3412AIFE
16-Lead Plastic TSSOP
–40°C to 125°C
LTC3412AEUF#PBF
LTC3412AEUF#TRPBF 3412A
16-Lead (4mm × 4mm) Plastic QFN
–40°C to 125°C
LTC3412AIUF#PBF
LTC3412AIUF#TRPBF 3412A
16-Lead (4mm × 4mm) Plastic QFN
–40°C to 125°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3412AEFE
LTC3412AEFE#TR
3412AEFE
16-Lead Plastic TSSOP
–40°C to 125°C
LTC3412AIFE
LTC3412AIFE#TR
3412AIFE
16-Lead Plastic TSSOP
–40°C to 125°C
LTC3412AMPFE
LTC3412AMPFE#TR
3412AMPFE
16-Lead Plastic TSSOP
–55°C to 125°C
LTC3412AEUF
LTC3412AEUF#TR
3412A
16-Lead (4mm × 4mm) Plastic QFN
–40°C to 125°C
LTC3412AIUF
LTC3412AIUF#TR
3412A
16-Lead (4mm × 4mm) Plastic QFN
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
3412aff
2
For more information www.linear.com/LTC3412A


Part Number LTC3412AEFE
Description Monolithic Synchronous Step-Down Regulator
Maker Analog Devices
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