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LT1676IN8 Datasheet

  • LT1676IN8

  • Wide Input Range, High Efficiency, Step-Down Switching Regul...

  • 16頁

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LT1676
Wide Input Range,
High Efficiency, Step-Down
Switching Regulator
FEATURES
s
s
s
DESCRIPTIO
s
s
s
s
s
Wide Input Range: 7.4V to 60V
700mA Peak Switch Current Rating
Adaptive Switch Drive Maintains Efficiency at High
Load Without Pulse Skipping at Light Load
True Current Mode Control
100kHz Fixed Operating Frequency
Synchronizable to 250kHz
Low Supply Current in Shutdown: 30碌A(chǔ)
Available in 8-Pin SO and PDIP Packages
The LT
廬
1676 is a wide input range, high efficiency Buck
(step-down) switching regulator. The monolithic die in-
cludes all oscillator, control and protection circuitry. The
part can accept input voltages as high as 60V and contains
an output switch rated at 700mA peak current. Current
mode control offers excellent dynamic input supply rejec-
tion and short-circuit protection.
The LT1676 contains several features to enhance effi-
ciency. The internal control circuitry is normally powered
via the V
CC
pin, thereby minimizing power drawn directly
from the V
IN
supply (see Applications Information). The
action of the LT1676 switch circuitry is also load depen-
dent. At medium to high loads, the output switch circuitry
maintains high rise time for good efficiency. At light loads,
rise time is deliberately reduced to avoid pulse skipping
behavior.
The available SO-8 package and 100kHz switching fre-
quency allow for minimal PC board area requirements.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
Automotive DC/DC Converters
Telecom 48V Step-Down Converters
Cellular Phone Battery Charger Accessories
IEEE 1394 Step-Down Converters
TYPICAL APPLICATIO
V
IN
8V TO 50V
1
5
V
IN
2
SHDN
V
CC
3
V
SW
LT1676
FB
8
V
C
7
220碌H*
39碌F
63V
6
MBR160
100碌F
10V
EFFICIENCY (%)
+
+
5V
400mA
36.5k
1%
SYNC
2200pF
22k
100pF
12.1k
1%
GND
4
*65T #30 ON MAGNETICS
MPP #55030
1676 F01
Figure 1
U
Efficiency vs V
IN
and I
LOAD
90
80
70
60
50
40 V
IN
= 12V
30
20
1
V
IN
= 24V
V
IN
= 36V
V
IN
= 48V
10
I
LOAD
(mA)
1676 TA01
U
U
100
1000
1

LT1676IN8 產(chǎn)品屬性

  • LT1676

  • 50

  • 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

  • 1.24 V ~ 51 V

  • 7.4 V ~ 60 V

  • 電流模式，混合

  • 100kHz

  • 700mA

  • 無

  • -40°C ~ 125°C

  • 通孔

  • 8-DIP（0.300"，7.62mm）

  • 管件

  • 8-PDIP

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