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LT3973IMSE#PBF

Description
IC REG BUCK ADJ 0.75A 10-MSOP
CategoryPower/power management    The power supply circuit   
File Size510KB,24 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
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LT3973IMSE#PBF Overview

IC REG BUCK ADJ 0.75A 10-MSOP

LT3973IMSE#PBF Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?conform to
Parts packaging codeMSOP
package instructionLEAD FREE, PLASTIC, MSOP-10
Contacts10
Manufacturer packaging codeMSE
Reach Compliance Codecompliant
Base Number Matches1
LT3973/LT3973-3.3/LT3973-5
42V, 750mA Step-Down
Regulator with 2.5µA
Quiescent Current and
Integrated Diodes
FEATURES
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DESCRIPTION
The
LT
®
3973
is an adjustable frequency monolithic buck
switching regulator that accepts a wide input voltage range
up to 42V, and consumes only 2.5µA of quiescent current.
A high efficiency switch is included on the die along with
the catch diode, boost diode, and the necessary oscillator,
control and logic circuitry. Low ripple Burst Mode operation
maintains high efficiency at low output currents while keep-
ing the output ripple below 10mV in a typical application.
A minimum dropout voltage of 530mV is maintained when
the input voltage drops below the programmed output volt-
age, such as during automotive cold crank. Current mode
topology is used for fast transient response and good loop
stability. A catch diode current limit provides protection
against shorted outputs and overvoltage conditions, with
thermal shutdown providing additional fault protection. An
accurate programmable undervoltage lockout feature is
available, producing a low shutdown current of 0.75µA.
A power good flag signals when V
OUT
reaches 90% of
the programmed output voltage. The LT3973 is available
in small, thermally enhanced 10-lead MSOP and 3mm ×
3mm DFN packages.
L,
LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
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Ultralow Quiescent Current
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2.5µA I at 12V to 3.3V
Q
IN
OUT
®
Low Ripple Burst Mode Operation
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Output Ripple < 10mV
P-P
Wide Input Voltage Range: 4.2V to 42V Operating
Adjustable Switching Frequency: 200kHz to 2.2MHz
Integrated Boost and Catch Diodes
750mA Output Current
Excellent Start-Up and Dropout Performance
Fixed Output Voltages: 3.3V, 5V
n
1.9µA I at 12V
Q
IN
Accurate Programmable Undervoltage Lockout
Low Shutdown Current: I
Q
= 0.75µA
Internal Catch Diode Current Limit
Power Good Flag
Thermal Shutdown
Small, Thermally Enhanced 10-Lead MSOP and
(3mm × 3mm) DFN Packages
Automotive Battery Regulation
Power for Portable Products
Industrial Supplies
Gate Drive Bias
APPLICATIONS
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TYPICAL APPLICATION
5V Step-Down Converter
V
IN
5.6V TO 42V
V
IN
OFF ON
BOOST
LT3973
EN/UVLO
PG
RT
215k
f = 600kHz
SW
BD
OUT
FB
316k
3973 TA01a
Efficiency
90
V
IN
= 12V
1000
EFFICIENCY (%)
C3
0.47µF
L1
15µH
V
OUT
5V
750mA
1M
C2
22µF
80
100
POWER LOSS (mW)
70
10
60
1
C1
4.7µF
15pF
GND
50
0.1
40
0.01
0.1
1
100
10
LOAD CURRENT (mA)
3973 TA01b
0.01
3973fb
For more information
www.linear.com/LT3973
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