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LT3434IFE Datasheet

  • LT3434IFE

  • High Voltage 3A, 200kHz Step-Down Switching Regulator with 1...

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LT3434
High Voltage 3A, 200kHz
Step-Down Switching Regulator
with 100碌A(chǔ) Quiescent Current
FEATURES
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DESCRIPTIO
Wide Input Range: 3.3V to 60V
3A 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: 0.1鈩?/div>
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
3434 is a 200kHz monolithic buck switching
regulator that accepts input voltages up to 60V. A high
efficiency 3A, 0.1鈩?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 integrated in a new high
voltage 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 LT3434 is available in a 16-pin TSSOP package with
exposed pad leadframe for low thermal resistance.
APPLICATIO S
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High Voltage Power Conversion
14V and 42V Automotive Systems
Industrial Power Systems
Distributed Power Systems
Battery-Powered Systems
, LTC and LT are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Burst Mode is a registered
trademark of Linear Technology Corporation. *Protected by U.S. Patents including
6498466. **See Burst Mode Operation section for conditions.
TYPICAL APPLICATIO
14V to 3.3V Step-Down Converter with
100碌A(chǔ) No Load Quiescent Current
4.7碌F
100V
CER
0.68碌F 33碌H
SW
0.1碌F
C
SS
V
BIAS
FB
1碌F
C
T
SYNC
GND
PGFB
PG
100k
1%
27pF
165k
1%
100碌F
6.3V
TANT
30MQ100
4148
SUPPLY CURRENT (碌A(chǔ))
Supply Current vs
Input Voltage
150
V
OUT
= 3.3V
100
V
IN
V
IN
SHDN
BOOST
LT3434
V
OUT
3.3V
2A
125
75
EFFICIENCY (%)
100
75
50
25
0
V
C
4700pF
10k
470pF
3434 TA01
0
10
30
40
20
INPUT VOLTAGE (V)
50
60
3434 TA02a
U
Efficiency and Power Loss
vs Load Current
V
IN
= 12V
L = 33碌H
C
OUT
= 100碌F
EFFICIENCY
V
OUT
= 3.3V
50
TYPICAL POWER
LOSS
25
0.01
0.1
10
V
OUT
= 5V
1
U
U
POWER LOSS (W)
0
0.0001
0.001
0.1
0.01
LOAD CURRENT (A)
1
0.001
10
3434 TA02b
3434f
1

LT3434IFE 產(chǎn)品屬性

  • LT3434

  • 95

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器

  • -

  • 降壓（降壓）

  • 可調(diào)式

  • 1

  • 1.25 V ~ 54 V

  • 3.3 V ~ 60 V

  • 電流模式，混合

  • 200kHz

  • 3A

  • 無(wú)

  • -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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