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LTC3412EFE Datasheet

Monolithic Synchronous Step-Down Regulator

No Preview Available !

LTC3412
2.5A, 4MHz, Monolithic
Synchronous Step-Down Regulator
FEATURES
High Efficiency: Up to 95%
2.5A Output Current
Low Quiescent Current: 62µA
Low RDS(ON) Internal Switches: 85mΩ
Programmable Frequency: 300kHz to 4MHz
No Schottky Diode Required
± 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 Protection
Available in 16-Lead Thermally Enhanced TSSOP
and QFN Packages
APPLICATIONS
Portable Instruments
Battery-Powered Equipment
Notebook Computers
Distributed Power Systems
Cellular Telephones
Digital Cameras
DESCRIPTION
The LTC®3412 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 2.625V to 5.5V and provides
an adjustable regulated output voltage from 0.8V to 5V
while delivering up to 2.5A of output current. The inter-
nal synchronous power switch with 85mΩ on-resistance
increases efficiency and eliminates the need for an external
Schottky diode. Switching frequency is set by an external
resistor or can be sychronized to an external clock. 100%
duty cycle provides low dropout operation extending bat-
tery life in portable systems. OPTI-LOOP® compensation
allows the transient response to be optimized over a wide
range of loads and output capacitors.
The LTC3412 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. To further maximize bat-
tery life, the P-channel MOSFET is turned on continuously
in dropout (100% duty cycle).
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.
TYPICAL APPLICATION
VIN
2.7V TO 5.5V
4.7M
470pF 15k
1000pF
309k
SVIN PVIN
RT
PGOOD
SW
LTC3412
100pF
RUN/SS
PGND
SGND
ITH
SYNC/MODE VFB
110k 392k
75k
22µF
1µH
VOUT
2.5V
100µF 2.5A
3412 F01
Figure 1. 2.5V, 2.5A Step-Down Regulator
Efficiency vs Load Current
100
80
Burst Mode OPERATION
60
FORCED CONTINUOUS
40
20
0
0.001
VIN = 3.3V
VOUT = 2.5V
0.01
0.1
1
10
LOAD CURRENT (A)
3412 G01
For more information www.linear.com/LTC3412
3412fc
1


Analog Devices Semiconductor Electronic Components Datasheet

LTC3412EFE Datasheet

Monolithic Synchronous Step-Down Regulator

No Preview Available !

LTC3412
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage..................................... – 0.3V to 6V
ITH, RUN, VFB Voltages................................ –0.3V to VIN
SYNC/MODE Voltages.................................. –0.3V to VIN
SW Voltage.................................... –0.3V to (VIN + 0.3V)
Peak SW Sink and Source Current ...........................6.5A
Operating Temperature Range (Note 2)....–40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
Junction Temperature (Note 5).............................. 125°C
Lead Temperature (Soldering, 10 sec) TSSOP....... 300°C
PIN CONFIGURATION
TOP VIEW
SVIN 1
PGOOD 2
ITH 3
VFB 4
RT 5
SYNC/MODE 6
RUN/SS 7
SGND 8
16 PVIN
15 SW
14 SW
13 PGND
17
12 PGND
11 SW
10 SW
9 PVIN
FE PACKAGE
16-LEAD PLASTIC TSSOP
EXPOSED PAD (PIN 17) IS SGND, MUST BE SOLDERED TO PCB
TJMAX = 125°C, θJA = 37.6°C/W, θJC = 10°C/W
TOP VIEW
16 15 14 13
RUN/SS 1
12 PGOOD
SGND 2
17
11 SVIN
PVIN 3
10 PVIN
SW 4
9 SW
5678
UF PACKAGE
16-LEAD (4mm × 4mm) PLASTIC QFN
EXPOSED PAD (PIN 17) IS SGND, MUST BE SOLDERED TO PCB
TJMAX = 125°C, θJA = 34°C/W, θJC = 1°C/W
ORDER INFORMATION http://www.linear.com/product/LTC3412#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3412EFE#PBF
LTC3412EFE#TRPBF
3412EFE
16-Lead Plastic TSSOP
–40°C to 125°C
LTC3412IFE#PBF
LTC3412IFE#TRPBF
3412IFE
16-Lead Plastic TSSOP
–40°C to 125°C
LTC3412EUF#PBF
LTC3412EUF#TRPBF
3412
16-Lead (4mm × 4mm) Plastic QFN
–40°C to 125°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3412EFE
LTC3412EFE#TR
3412EFE
16-Lead Plastic TSSOP
–40°C to 125°C
LTC3412IFE
LTC3412IFE#TR
3412IFE
16-Lead Plastic TSSOP
–40°C to 125°C
LTC3412EUF
LTC3412EUF#TR
3412
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.
3412fc
2
For more information www.linear.com/LTC3412


Part Number LTC3412EFE
Description Monolithic Synchronous Step-Down Regulator
Maker Analog Devices
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