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LT1776IS8 Datasheet

  • LT1776IS8

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

  • 150.79KB

  • 20頁

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LT1776
Wide Input Range,
High Efficiency, Step-Down
Switching Regulator
FEATURES
s
s
s
s
DESCRIPTIO
s
s
s
s
s
Wide Input Range: 7.4V to 40V
Tolerates Input Transients to 60V
700mA Peak Switch Rating
Adaptive Switch Drive Maintains Efficiency at High
Load Without Pulse Skipping at Light Load
True Current Mode Control
200kHz Fixed Operating Frequency
Synchronizable to 400kHz
Low Supply Current in Shutdown: 30碌A(chǔ)
Available in 8-Pin SO and PDIP Packages
The LT
廬
1776 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 delivers excellent dynamic input supply
rejection and short-circuit protection.
The LT1776 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 LT1776 switch circuitry is also load depen-
dent. At medium to high loads, the output switch circuitry
maintains fast rise time for good efficiency. At light loads,
rise time is deliberately reduced to avoid pulse skipping
behavior.
The available SO-8 package and 200kHz 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
Automotive DC/DC Converters
Cellular Phone Battery Charger Accessories
IEEE 1394 Step-Down Converters
TYPICAL APPLICATIO
V
IN
8V TO 40V
1
5
V
IN
SHDN
V
CC
V
SW
39碌F
63V
6
LT1776
FB
SYNC
V
C
7
8
2
3
90
80
100碌H*
MBR160
100碌F
10V
EFFICIENCY (%)
+
+
5V
400mA
36.5k
1%
70
60
50
40
2200pF
22k
100pF
12.1k
1%
GND
4
*43T #30 ON MAGNETICS
MPP #55030
1776 F01
V
IN
= 10V
V
IN
= 20V
30
V
IN
= 30V
V
IN
= 40V
20
1
Figure 1
U
Efficiency vs V
IN
and I
LOAD
10
100
LOAD CURRENT (mA)
1000
1776 TA01
U
U
1

LT1776IS8 產(chǎn)品屬性

  • LT1776

  • 100

  • 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 ~ 34 V

  • 7.4 V ~ 40 V

  • 電流模式，混合

  • 200kHz

  • 700mA

  • 無

  • -40°C ~ 125°C

  • 表面貼裝

  • 8-SOIC（0.154"，3.90mm 寬）

  • 管件

  • 8-SOIC

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