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PDF SC2608 Data sheet ( Hoja de datos )
| Número de pieza | SC2608 | |
| Descripción | Synchronous Voltage Mode PWM Controller | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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POWER MANAGEMENT
Description
The SC2608 is a versatile voltage-mode PWM controller
designed for use in step down DC/DC power supply appli-
cations. A simple, fixed frequency, highly efficient buck
regulator can be implemented using the SC2608 with mini-
mal external components. The input voltage range is from
+3.3V to +12V. Internal level shift and drive circuitry elimi-
nates the need for an expensive P-channel, high-side
MOSFET. The small device footprint allows for compact
www.DatacSihreceut4itUd.ceosmign.
SC2608 features include temperature compensated volt-
age reference, triangle wave oscillator, current limit com-
parator, and an externally compensated error amplifier.
Current limit is implemented by sensing the voltage drop
across the bottom MOSFET RDS(ON).
The SC2608 operates at a fixed frequency of 200kHz
providing an optimum compromise between efficiency ,
external component size, and cost.
SC2608 has a thermal protection circuit, which is
activated if the junction temperature exceeds 150 OC.
SC2608
Simple, Synchronous
Voltage Mode PWM Controller
Features
+3.3V or +5V or +12V input voltage
200kHz operation
High efficiency (>90%)
1% 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
SC2608
COMP/SS SENSE
GND
VCC
sense
+12V
+12V/+5V/+3.3V
DL PHASE
DH BST
VOUT
sense
Revision 4: October, 2005
Figure 1
1
www.semtech.com
1 page  
SC2608
POWER MANAGEMENT
Pin Configuration
Top View
BST 1
8
DH 2
7
GND
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DL
3
4
6
5
Ordering information
PHASE
COMP/SS
SENSE
VCC
Device (1)
SC2608STRT(2)
SC2608EVB
Package
SO-8
Evaluation Board
Temp Range (TJ)
-40 to 125OC
Notes:
(1) Only available in tape and reel packaging. A reel con-
tains 2500 devices.
(2) This device is fully WEEE and RoHS Compliant
(8-Pin SO-8)
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.
© 2005 Semtech Corp.
5
www.semtech.com
5 Page 
POWER MANAGEMENT
Typical Performance Characteristics
Effic ie nc y V.S . Loa d C urre nt
92
90
88
86
84
82
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80
78
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Loa d C urre nt (A)
Transient Response
SC2608
Start up
Vin
Comp/ ss
DL
VOUT
Over Current Protection (33A DC tripped)
COMP/SS
VOUT
IL (10A/10mV)
0 -18 A step load
Gate waveforms
VIN
Comp/ss
DH
VOUT
OCP HICCUP
DH
Phase node
DL
15 A sustain loading
© 2005 Semtech Corp.
VIN
Comp/SS
DH
VOUT
11 www.semtech.com
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet SC2608.PDF ] | |
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