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LT3976IUDD#PBF

Description
IC REG BUCK ADJ 5A 24QFN
Categorysemiconductor    Power management   
File Size407KB,28 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
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LT3976IUDD#PBF Overview

IC REG BUCK ADJ 5A 24QFN

LT3976IUDD#PBF Parametric

Parameter NameAttribute value
Functionstep down
Output configurationjust
Topologystep down
Output typeAdjustable
Number of outputs1
Voltage - Input (minimum)4.3V
Voltage - input (maximum)40V
Voltage - Output (minimum/fixed)1.197V
Voltage - Output (maximum)38.8V
Current - Output5A
Frequency - Switch200kHz ~ 2.25MHz
Synchronous rectifiernone
Operating temperature-40°C ~ 125°C (TJ)
Installation typesurface mount
Package/casing24-WFQFN Exposed Pad
Supplier device packaging24-QFN(3x5)
LT3976
40V, 5A, 2MHz Step-Down
Switching Regulator with
3.3µA Quiescent Current
FeaTures
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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.
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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
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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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Description IC REG BUCK ADJ 5A 24QFN LT3976 - 40V, 5A, 2MHz Step-Down Switching Regulator with 3.3µA Quiescent Current; Package: MSOP; Pins: 16; Temperature Range: -40°C to 125°C IC reg buck adj 5A 16-msop IC REG BUCK ADJ 5A 16-MSOP LT3976 - 40V, 5A, 2MHz Step-Down Switching Regulator with 3.3µA Quiescent Current; Package: QFN; Pins: 24; Temperature Range: -40°C to 85°C IC REG BUCK ADJ 5A 16-MSOP LT3976 - 40V, 5A, 2MHz Step-Down Switching Regulator with 3.3µA Quiescent Current; Package: QFN; Pins: 24; Temperature Range: -40°C to 85°C IC REG BUCK ADJ 5A 16-MSOP IC REG BUCK ADJ 5A 24QFN IC REG BUCK ADJ 5A 16-MSOP
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