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PDF SC2608A Data sheet ( Hoja de datos )
| Número de pieza | SC2608A | |
| Descripción | Synchronous Voltage Mode PWM Controller | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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POWER MANAGEMENT
Description
The SC2608A is a versatile voltage-mode PWM control-
ler designed for use in step down DC/DC power supply
applications. A simple, fixed frequency, highly efficient
buck regulator can be implemented using the SC2608A
with minimal external components. The input voltage
range is from +5V to +12V. Internal level shift and drive
circuitry eliminates the need for an expensive P-channel,
high-side MOSFET. The small device footprint allows for
www.DatacSohmeept4aUc.ctomcircuit design.
SC2608A features include temperature compensated
voltage reference, triangle wave oscillator, current limit
comparator, and an externally compensated error ampli-
fier. Current limit is implemented by sensing the voltage
drop across the bottom MOSFET RDS(ON).
The SC2608A operates at a fixed frequency of 250kHz
providing an optimum compromise between efficiency ,
external component size, and cost.
SC2608A has a thermal protection circuit, which is
activated if the junction temperature exceeds 150 OC.
SC2608A
Simple, Synchronous
Voltage Mode PWM Controller
Features
+5V or +12V input voltage
250kHz operation
High efficiency (>90%)
1.5% Reference voltage accuracy
Hiccup mode over current protection
Robust output drive
RDS(ON) Current sensing for protection
Industrial temperature range
SO-8 package
Integrated boot strap diode
Thermal Shut down
Fully WEEE and RoHS Compliant
Applications
Termination supplies
Low cost microprocessor supplies
Peripheral card supplies
Industrial power supplies
High density DC/DC conversion
Typical Application Circuit
SSCC22660088A
COMP/SS SENSE
GND
VCC
sense
+12V
+12V/+5V/+3.3V
DL PHASE
DH BST
VOUT
sense
Revision 2: April, 2006
Figure 1
1
www.semtech.com
1 page  
SC2608A
POWER MANAGEMENT
Pin Configuration
Top View
BST
DH
GND
www.DataSheet4U.com
DL
18
27
36
45
(8-Pin SO-8)
Ordering information
PHASE
Device (1)
SC2608ASTRT(2)
SC2608AEVB
Package
SO-8
Evaluation Board
Temp Range (TJ)
-40 to 125OC
COMP/SS
SENSE
VCC
Notes:
(1) Only available in tape and reel packaging. A reel con-
tains 2500 devices.
(2) This device is fully WEEE and RoHS Compliant
Pin Descriptions
Pin
#
Pin Name
1 BST
2 DH
3 GND
4 DL
5 VCC
6 Sense
7 COMP/SS
8 PHASE
Pin Function
Bootstrap for high side driver.
High side driver output.
Ground.
Low side driver output.
Chip bias supply pin.
Output voltage sense input.
Error amplifier output. Connect compensation network to GND. The compensation capacitor
serves as soft start capacitor. By pulling this pin low will disable the output.
Connect this pin to the switching node between the MOSFETs.
© 2006 Semtech Corp.
5
www.semtech.com
5 Page 
POWER MANAGEMENT
Typical Performance Characteristics
Efficiency V. S. Load Current
95
94
93
92
91
90
89
88
w w w . D a t a87S h e e t 4 U . c o m
86
85
0 2 4 6 8 10 12 14 16 18 20
Transient Response
COMP/SS
VOUT
IL(10A/DIV)
5 -18 A step load
Gate waveforms
DH
Phase node
DL
SC2608A
Start up
Vin
Comp/ SS
DL
VO
Over Current Protection (21A DC tripped)
Vin
Comp/ SS
DL
VO
OCP HICCUP
Vin
Comp/ SS
DL
VO
15 A sustain loading
© 2006 Semtech Corp.
11
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11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet SC2608A.PDF ] | |
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