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LT3976EMSE#PBF

Description
IC reg buck adj 5A 16-msop
CategoryPower/power management    The power supply circuit   
File Size407KB,28 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
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LT3976EMSE#PBF Overview

IC reg buck adj 5A 16-msop

LT3976EMSE#PBF Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?conform to
Parts packaging codeMSOP
package instructionHTSSOP, TSSOP16,.19,20
Contacts16
Manufacturer packaging codeMSE
Reach Compliance Codecompliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage40 V
Minimum input voltage4.3 V
JESD-30 codeR-PDSO-G16
JESD-609 codee3
length4.039 mm
Humidity sensitivity level1
Number of functions1
Number of terminals16
Maximum operating temperature125 °C
Minimum operating temperature-40 °C
Maximum output current12.5 A
Package body materialPLASTIC/EPOXY
encapsulated codeHTSSOP
Encapsulate equivalent codeTSSOP16,.19,20
Package shapeRECTANGULAR
Package formSMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)NOT SPECIFIED
Certification statusNot Qualified
Maximum seat height1.1 mm
surface mountYES
Switch configurationBUCK
Maximum switching frequency2700 kHz
technologyBIPOLAR
Temperature levelAUTOMOTIVE
Terminal surfaceMatte Tin (Sn)
Terminal formGULL WING
Terminal pitch0.5 mm
Terminal locationDUAL
Maximum time at peak reflow temperatureNOT SPECIFIED
width3 mm
Base Number Matches1
LT3976
40V, 5A, 2MHz Step-Down
Switching Regulator with
3.3µA Quiescent Current
FeaTures
n
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DescripTion
The
LT
®
3976
is an adjustable frequency monolithic buck
switching regulator that accepts a wide input voltage range
up to 40V. Low quiescent current design consumes only
3.3µA of supply current while regulating with no load. Low
ripple Burst Mode operation maintains high efficiency at
low output currents while keeping the output ripple below
15mV in a typical application. The LT3976 can supply up
to 5A of load current and has current limit foldback to
limit power dissipation during short-circuit. A low dropout
voltage of 500mV is maintained when the input voltage
drops below the programmed output voltage, such as
during automotive cold crank.
An internally compensated current mode topology is used
for fast transient response and good loop stability. A high
efficiency 75mΩ switch is included on the die along with a
boost Schottky diode. An accurate 1.02V threshold enable
pin can be driven directly from a microcontroller or used
as a programmable undervoltage lockout. A capacitor on
the SS pin provides a controlled inrush current (soft-start).
A power good flag signals when V
OUT
reaches 91.6% of
the programmed output voltage. The LT3976 is available
in small 16-lead MSOP and 24-lead 3mm × 5mm QFN
packages with exposed pad for low thermal resistance.
n
n
n
n
n
n
n
n
n
n
n
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Ultralow Quiescent Current:
3.3µA I
Q
at 12V
IN
to 3.3V
OUT
Low Ripple Burst Mode
®
Operation
Output Ripple < 15mV
P-P
Wide Input Range: Operation from 4.3V to 40V
5A Maximum Output Current
Excellent Start-Up and Dropout Performance
Adjustable Switching Frequency: 200kHz to 2MHz
Synchronizable Between 250kHz to 2MHz
Accurate Programmable Undervoltage Lockout
Low Shutdown Current: I
Q
= 700nA
Power Good Flag
Soft-Start Capability
Thermal Shutdown Protection
Current Limit Foldback with Soft-Start Override
Saturating Switch Design: 75mΩ On-Resistance
Small, Thermally Enhanced 16-Lead MSOP and
24-Lead 3mm × 5mm QFN Packages
Automotive Battery Regulation
Portable Products
Industrial Supplies
applicaTions
n
n
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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.
Typical applicaTion
3.3V Step-Down Converter
V
IN
4.3V TO 40V
OFF ON
EN
PG
10µF
LT3976
SS
10nF
RT
SYNC
130k
f = 400kHz
OUT
FB
GND
BOOST
SW
INPUT CURRENT (µA)
8
7
No-Load Supply Current
IN REGULATION
V
OUT
= 3.3V
V
IN
6
5
4
3
2
1
0
0
5
10
15 20 25 30
INPUT VOLTAGE (V)
35
40
0.47µF
PDS540
2
3.3µH
470pF
1M
10pF
576k
3976 TA01a
V
OUT
3.3V
5A
47µF
1210
×2
3976 G05
3976f
For more information
www.linear.com/3976
1

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