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LT1976IFE Datasheet

  • LT1976IFE

  • High Voltage 1.5A, 200kHz Step-Down Switching Regulator with...

  • 24頁

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LT1976
High Voltage 1.5A, 200kHz
Step-Down Switching Regulator
with 100碌A(chǔ) Quiescent Current
FEATURES
s
s
s
s
s
s
s
s
s
DESCRIPTIO
s
s
s
s
Wide Input Range: 3.3V to 60V
1.5A Peak Switch Current
Burst Mode
廬
Operation: 100碌A(chǔ) Quiescent Current**
Low Shutdown Current: I
Q
< 1碌A(chǔ)
Power Good Flag with Programmable Threshold
Load Dump Protection to 60V
200kHz Switching Frequency
Saturating Switch Design: 0.2鈩?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
廬
1976 is a 200kHz monolithic buck switching
regulator that accepts input voltages up to 60V. A high
efficiency 1.5A, 0.2鈩?switch is included on the die along
with all the necessary oscillator, control and logic cir-
cuitry. 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. Patented circuitry maintains peak switch current
over the full duty cycle range.* Shutdown reduces input
supply current to less than 1碌A(chǔ). 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
device also has a power good flag with a programmable
threshold and time-out and thermal shutdown protection.
The LT1976 is available in a 16-pin TSSOP package with
exposed pad leadframe for low thermal resistance.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
*U.S. Patent 6,498,466 **See Burst Mode Operation section for conditions
APPLICATIO S
s
s
s
s
s
High Voltage Power Conversion
14V and 42V Automotive Systems
Industrial Power Systems
Distributed Power Systems
Battery-Powered Systems
TYPICAL APPLICATIO
V
IN
3.3V TO 60V
14V to 3.3V Step-Down Converter with
100碌A(chǔ) No Load Quiescent Current
4.7碌F
100V
CER
0.33碌F 33碌H
SW
0.1碌F
10MQ100N
V
C
0.047碌F
12.5k
1碌F
100pF
C
T
SYNC
GND
C
SS
V
BIAS
FB
PGFB
PG
27pF
165k
1%
100k
1%
SUPPLY CURRENT (碌A(chǔ))
Supply Current vs
Input Voltage
150
V
IN
SHDN
BOOST
4148
LT1976
V
OUT
3.3V
1A
V
OUT
= 3.3V
T
A
= 25擄C
125
100
75
50
25
0
EFFICIENCY (%)
100碌F
6.3V
TANT
1976 TA01
0
10
30
40
20
INPUT VOLTAGE (V)
50
1976 F05
U
Efficiency vs Load Current
100
90
80
70
60
50
40
30
20
10
60
0
0.0001
0.001
0.1
0.01
LOAD CURRENT (A)
1
10
1976 TA02
U
U
T
A
= 25擄C
V
OUT
= 5V
V
OUT
= 3.3V
1976f
1

LT1976IFE 產(chǎn)品屬性

  • LT1976/B

  • 95

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器

  • -

  • 降壓（降壓）

  • 可調(diào)式

  • 1

  • 1.2 V ~ 54 V

  • 3.3 V ~ 60 V

  • 電流模式，混合

  • 200kHz

  • 1.5A

  • 無

  • -40°C ~ 125°C

  • 表面貼裝

  • 16-TSSOP（0.173"，4.40mm）裸露焊盤

  • 管件

  • 16-TSSOP-EP

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