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LT1576IS8-SYNC

Description
3.5 A SWITCHING REGULATOR, 240 kHz SWITCHING FREQ-MAX, PDSO8
CategoryPower/power management    The power supply circuit   
File Size292KB,28 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Related ProductsFound3parts with similar functions to LT1576IS8-SYNC
Download Datasheet Parametric View All

LT1576IS8-SYNC Overview

3.5 A SWITCHING REGULATOR, 240 kHz SWITCHING FREQ-MAX, PDSO8

LT1576IS8-SYNC Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?incompatible
MakerLinear ( ADI )
Parts packaging codeSOIC
package instructionSOP, SOP8,.25
Contacts8
Manufacturer packaging codeS8
Reach Compliance Code_compli
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
control modeCURRENT-MODE
Maximum input voltage25 V
Minimum input voltage5 V
Nominal input voltage15 V
JESD-30 codeR-PDSO-G8
JESD-609 codee0
length4.9025 mm
Humidity sensitivity level1
Number of functions1
Number of terminals8
Maximum operating temperature125 °C
Minimum operating temperature-40 °C
Maximum output current3.5 A
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Encapsulate equivalent codeSOP8,.25
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Maximum seat height1.752 mm
surface mountYES
Switch configurationBUCK
Maximum switching frequency240 kHz
technologyBIPOLAR
Temperature levelAUTOMOTIVE
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL
Maximum time at peak reflow temperature20
width3.899 mm
LT1576/LT1576-5
1.5A, 200kHz Step-Down
Switching Regulator
FEATURES
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
Constant 200kHz Switching Frequency
1.21V Reference Voltage
Fixed 5V Output Option
Easily Synchronizable
Uses All Surface Mount Components
Inductor Size Reduced to 15
µ
H
Saturating Switch Design: 0.2Ω
Effective Supply Current: 1.16mA
Shutdown Current: 20µA
Cycle-by-Cycle Current Limiting
Fused Lead SO-8 Package
The LT
®
1576 is a 200kHz monolithic buck mode switching
regulator. A 1.5A switch is included on the die along with
all the necessary oscillator, control and logic circuitry. The
topology is current mode for fast transient response and
good loop stability. The LT1576 is a modified version of the
industry standard LT1376 optimized for noise sensitive
applications.
In addition, the reference voltage has been lowered to
allow the device to produce output voltages down to 1.2V.
Quiescent current has been reduced by a factor of two.
Switch on resistance has been reduced by 30%. Switch tran-
sition times have been slowed to reduce EMI generation.
The oscillator frequency has been reduced to 200kHz to
maintain high efficiency over a wide output current range.
The pinout has been changed to improve PC layout by
allowing the high current high frequency switching cir-
cuitry to be easily isolated from low current noise sensitive
control circuitry. The new SO-8 package includes a fused
ground lead which significantly reduces the thermal resis-
tance of the device to extend the ambient operating tem-
perature range. There is an optional function of shutdown
or synchronization. Standard surface mount external parts
can be used including the inductor and capacitors.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
Portable Computers
Battery-Powered Systems
Battery Charger
Distributed Power
TYPICAL APPLICATION
Efficiency vs Load Current
5V Buck Converter
INPUT
6V TO 25V
C3*
10µF TO
50µF
100
95
EFFICIENCY (%)
90
85
80
75
70
V
OUT
= 5V
V
IN
= 10V
L = 33µH
+
V
IN
BOOST
C2
0.33µF
V
SW
L1**
15µH
D2
1N914
OUTPUT**
5V, 1.25A
LT1576
OPEN = ON
SHDN
GND
V
C
BIAS
FB
D1
1N5818
C
C
100pF
R1
15.8k
R2
4.99k
* RIPPLE CURRENT RATING
I
OUT
/2
** INCREASE L1 TO 30µH FOR LOAD
CURRENTS ABOVE 0.6A AND TO
60µH ABOVE 1A
SEE APPLICATIONS INFORMATION
+
C1
100µF, 10V
SOLID
TANTALUM
1576 TA01
U
0
0.25
0.50 0.75 1.00
LOAD CURRENT (A)
1.25
1.50
1576 TA02
U
U
1

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