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LT1776CN8

Description
Conv DC-DC 7.4V to 40V Step Down Single-Out 1.24V to 34V 0.7A Automotive 8-Pin PDIP N
File Size220KB,20 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Download user manual Parametric View All

LT1776CN8 Overview

Conv DC-DC 7.4V to 40V Step Down Single-Out 1.24V to 34V 0.7A Automotive 8-Pin PDIP N

LT1776CN8 Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesNot Compliant
ECCN (US)EAR99
Part StatusUnconfirmed
HTS8542.39.00.01
SVHCYes
SVHC Exceeds ThresholdYes
TypeStep Down
Output TypeAdjustable
Switching Frequency (kHz)220
Switching RegulatorYes
Number of Outputs1
Output Voltage (V)1.24 to 34
Maximum Output Current (A)0.7
Minimum Input Voltage (V)7.4
Maximum Input Voltage (V)40
Operating Supply Voltage (V)7.4 to 40
Line Regulation0.01%/V
Minimum Operating Temperature (°C)0
Maximum Operating Temperature (°C)125
Supplier Temperature GradeCommercial
Pin Count8
Standard Package NameDIP
Supplier PackagePDIP N
MountingThrough Hole
Package Height3.3
Package Length10.16(Max)
Package Width6.48
PCB changed8
Lead ShapeThrough Hole
LT1776
Wide Input Range,
High Efficiency, Step-Down
Switching Regulator
FEATURES
s
s
s
s
DESCRIPTION
The LT
®
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.
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: 30µA
Available in 8-Pin SO and PDIP Packages
APPLICATIONS
s
s
s
Automotive DC/DC Converters
Cellular Phone Battery Charger Accessories
IEEE 1394 Step-Down Converters
TYPICAL APPLICATION
V
IN
8V TO 40V
1
5
V
IN
SHDN
V
CC
V
SW
39µF
63V
6
LT1776
FB
8
V
C
2200pF
22k
100pF
12.1k
1%
7
2
3
100µH*
5V
400mA
36.5k
1%
90
80
MBR160
100µF
10V
EFFICIENCY (%)
+
+
70
60
50
40
SYNC
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
U
U
Efficiency vs V
IN
and I
LOAD
10
100
LOAD CURRENT (mA)
1000
1776 TA01
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