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Linear Technology Electronic Components Datasheet

LT1912 Datasheet

Step-Down Switching Regulator

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LT1912
36V, 2A, 500kHz Step-Down
Switching Regulator
FEATURES
Wide Input Range:
Operation From 3.6V to 36V
2A Maximum Output Current
Adjustable Switching Frequency: 200kHz to 500kHz
www.DataSheetL4Uo.wcomShutdown Current: IQ < 1μA
Integrated Boost Diode
Synchronizable Between 250kHz to 500kHz
Saturating Switch Design: 0.25Ω On-Resistance
0.790V Feedback Reference Voltage
Output Voltage: 0.79V to 20V
Soft-Start Capability
Small 10-Pin Thermally Enhanced MSOP and
(3mm × 3mm) DFN Packages
APPLICATIONS
Automotive Battery Regulation
Set Top Box
Distributed Supply Regulation
Industrial Supplies
Wall Transformer Regulation
DESCRIPTION
The LT®1912 is an adjustable frequency (200kHz to
500kHz) monolithic step-down switching regulator that
accepts input voltages up to 36V. A high efficiency 0.25Ω
switch is included on the die along with a boost Schottky
diode and the necessary oscillator, control, and logic cir-
cuitry. Current mode topology is used for fast transient
response and good loop stability. The LT1912 allows the
use of ceramic capacitors resulting in low output ripple
while keeping total solution size to a minimum. The low
current shutdown mode reduces input supply current
to less than 1μA while a resistor and capacitor on the
RUN/SS pin provide a controlled output voltage ramp
(soft-start). The LT1912 is available in 10-Pin MSOP and
3mm × 3mm DFN packages with exposed pads for low
thermal resistance.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
VIN
4.5V TO 36V
3.3V Step-Down Converter
OFF ON
VIN
RUN/SS
BD
BOOST
4.7μF
470pF
20k
VC LT1912 SW
RT
68.1k
SYNC
GND
FB
VOUT
3.3V
2A
0.47μF 6.8μH
316k
100k
47μF
1912 TA01
Efficiency
100
VOUT = 5V
90
80 VOUT = 3.3V
70
60
VIN = 12V
L = 6.8μF
50 F = 500kHz
0 0.5 1.0 1.5
2
LOAD CURRENT (A)
1912 TA01b
1912f
1


Linear Technology Electronic Components Datasheet

LT1912 Datasheet

Step-Down Switching Regulator

No Preview Available !

LT1912
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN, RUN/SS Voltage.................................................36V
BOOST Pin Voltage ...................................................56V
BOOST Pin Above SW Pin.........................................30V
FB, RT, VC Voltage .......................................................5V
BD, SYNC Voltage .....................................................30V
Operating Junction Temperature Range (Note 2)
LT1912E ........................................... –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
(MSE Only) ........................................................... 300°C
PIN CONFIGURATION
www.DataSheet4U.com
TOP VIEW
BD
BOOST
SW
VIN
RUN/SS
1
2
3
4
5
10 RT
9 VC
11 8 FB
7 N/C
6 SYNC
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
JA = 45°C/W, JC = 10°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
BD 1
BOOST 2
SW 3
VIN 4
RUN/SS 5
TOP VIEW
11
10 RT
9 VC
8 FB
7 N/C
6 SYNC
MSE PACKAGE
10-LEAD PLASTIC MSOP
JA = 45°C/W, JC = 10°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LT1912EDD#PBF
LT1912EMSE#PBF
LT1912EDD#TRPBF
LT1912EMSE#TRPBF
LDJT
LTDJS
10-Lead (3mm × 3mm) Plastic DFN
10-Lead Plastic MSOP
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 10V, VRUN/SS = 10V, VBOOST = 15V, VBD = 3.3V unless otherwise
noted. (Note 2)
PARAMETER
Minimum Input Voltage
Quiescent Current from VIN
Quiescent Current from BD
Minimum Bias Voltage (BD Pin)
CONDITIONS
VRUN/SS = 0.2V
VBD = 3V, Not Switching
VBD = 0, Not Switching
VRUN/SS = 0.2V
VBD = 3V, Not Switching
VBD = 0, Not Switching
MIN
TYP MAX UNITS
3 3.6
V
0.01 0.5
450 600
1.3 1.7
μA
μA
μA
0.01 0.5
0.9 1.3
15
μA
mA
μA
2.7 3
V
1912f
2


Part Number LT1912
Description Step-Down Switching Regulator
Maker Linear Technology Corporation
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LT1912 Datasheet PDF





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