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LT1976EFE#TRPBF

Description
Conv DC-DC 2.4V to 60V Step Down Single-Out 1.2V to 54V 3.5A Automotive 16-Pin TSSOP EP T/R
File Size302KB,28 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric View All

LT1976EFE#TRPBF Overview

Conv DC-DC 2.4V to 60V Step Down Single-Out 1.2V to 54V 3.5A Automotive 16-Pin TSSOP EP T/R

LT1976EFE#TRPBF Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesCompliant
ECCN (US)EAR99
Part StatusActive
HTS8542.39.00.01
TypeStep Down
Output TypeAdjustable
Switching Frequency (kHz)230
Switching RegulatorYes
Number of Outputs1
Output Voltage (V)1.2 to 54
Maximum Output Current (A)3.5
Minimum Input Voltage (V)2.4
Maximum Input Voltage (V)60
Typical Quiescent Current (uA)100
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)125
Supplier Temperature GradeExtended
PackagingTape and Reel
Pin Count16
Standard Package NameSOP
Supplier PackageTSSOP EP
MountingSurface Mount
Package Height0.95(Max)
Package Length5.1(Max)
Package Width4.5(Max)
PCB changed16
Lead ShapeGull-wing
LT1976/LT1976B
High Voltage 1.5A, 200kHz
Step-Down Switching Regulator
with 100μA Quiescent Current
FEATURES
DESCRIPTIO
Wide Input Range: 3.3V to 60V
1.5A Peak Switch Current (LT1976)
100μA Quiescent Current (LT1976)**
1.6mA Quiescent Current (LT1976B)
Low Shutdown Current: I
Q
< 1μA
Power Good Flag with Programmable Threshold
Load Dump Protection to 60V
200kHz Switching Frequency
Saturating Switch Design: 0.2Ω On-Resistance
Peak Switch Current Maintained Over
Full Duty Cycle Range*
1.25V Feedback Reference Voltage
Easily Synchronizable
Soft-Start Capability
Small 16-Pin Thermally Enhanced TSSOP Package
The LT
®
1976/LT1976B are 200kHz monolithic step-down
switching regulators that accept input voltages up to 60V.
A high efficiency 1.5A, 0.2Ω switch is included on the die
along with all the necessary oscillator, control and logic
circuitry. Current mode topology is used for fast transient
response and good loop stability.
Innovative design techniques along with a new high volt-
age process achieve high efficiency over a wide input
range. Efficiency is maintained over a wide output current
range by employing Burst Mode operation at low currents,
utilizing the output to bias the internal circuitry, and by
using a supply boost capacitor to fully saturate the power
switch. The LT1976B does not shift into Burst Mode
operation at low currents, eliminating low frequency out-
put ripple at the expense of efficiency. Patented circuitry
maintains peak switch current over the full duty cycle
range.* Shutdown reduces input supply current to less
than 1μA. External synchronization can be implemented
by driving the SYNC pin with logic-level inputs. A single
capacitor from the C
SS
pin to the output provides a
controlled output voltage ramp (soft-start). The devices
also have a power good flag with a programmable thresh-
old and time-out and thermal shutdown protection.
The LT1976/LT1976B are available in a 16-pin TSSOP
package with Exposed Pad leadframe for low thermal
resistance.
APPLICATIO S
High Voltage Power Conversion
14V and 42V Automotive Systems
Industrial Power Systems
Distributed Power Systems
Battery-Powered Systems
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*Protected by U.S. Patents, including 6498466
**See Burst Mode Operation section for conditions
TYPICAL APPLICATIO
V
IN
3.3V TO 60V
V
IN
SHDN
LT1976
V
C
1500pF
10k
1μF
330pF
C
T
SYNC
GND
C
SS
V
BIAS
FB
PGFB
PG
47pF
BOOST
14V to 3.3V Step-Down Converter with
100μA No Load Quiescent Current
4.7μF
100V
CER
0.33μF 33μH
SW
0.1μF
10MQ60N
4148
SUPPLY CURRENT (μA)
LT1976 Supply Current vs
Input Voltage
150
V
OUT
3.3V
1A
V
OUT
= 3.3V
T
A
= 25°C
125
EFFICIENCY (%)
100
75
50
25
0
165k
1%
100k
1%
100μF
6.3V
TANT
1976 TA01
0
10
30
40
20
INPUT VOLTAGE (V)
50
60
1976 F05
U
LT1976 Efficiency and Power
Loss vs Load Current
100
EFFICIENCY
75
5V
3.3V
50
TYPICAL
POWER LOSS
25
0.01
0.1
1
POWER LOSS (W)
10
0
0.1
1
0.001
100
1000 10000
10
1976 TA02
LOAD CURRENT (mA)
U
U
1976bfg
1
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