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PDF SC2621A Data sheet ( Hoja de datos )
| Número de pieza | SC2621A | |
| Descripción | Voltage Mode PWM Controller | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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POWER MANAGEMENT
www.DataSheet4U.com
Description
SC2621A
Voltage Mode PWM Controller With
Linear Power Regulator
Features
The SC2621A provides the control and protection fea-
tures necessary for a synchronous buck converter and a
linear regulator in high performance graphic card appli-
cations.
The SC2621A is designed to directly drive the top and
bottom MOSFETs of the buck converter. It uses an inter-
nal 8.2V supply as the gate drive voltage for minimum
driver power loss and MOSFET switching loss. It allows
the converter to operate with 4V to 25V power rail and
as low as 0.5V output. The SC2621A is capable to drive
a N-type MOSFET in a linear regulator with as low as 0.5V
output.
The SC2621A features soft-start, supply power under
voltage lockout, and hiccup mode over current protec-
tion. The SC2621A monitors the output current by using
the Rdson of the bottom MOSFET in the buck converter
that eliminates the need for a current sensing resistor.
The SC2621A is offered in SOIC-14 package.
u 4V to 25V power rails
u Internal LDO for optimum gate drive voltage
u 1.5A gate drive current
u Adaptive non-overlapping gate drives provide
shoot-through protection for MOSFETs
u Programmable output voltages
u Internal soft start for both outputs
u Power rail under voltage lockout
u Hiccup mode short circuit protection
u SOIC-14 package, fully RoHS and WEEE compliant
Applications
u Graphics processor power supplies on PCI-Express
platform
u Embedded, low cost, high efficiency converters
u Point of load power supplies
Typical Application Circuit
12V IN
3.3V IN
2.5V OUT
+
U2
1 B ST
2 OCS
3 COMP
4 FB
5 LDOG
6 LDFB
7 GND
DH
PN
GND
DL
DRV
NC
V CC
14
13
12
11
10
9
8
S C2 621A
+
12
1.5V OUT
+
February 21, 2007
1 www.semtech.com
1 page  
POWER MANAGEMENT
Blowcwkw.DDaiataSghreaetm4U.com
SC2621A
8.2V
2007 Semtech Corp.
5
www.semtech.com
5 Page 
POWER MANAGEMENT
Appwlwicwa.DtaitoaSnhseetI4nUf.coomrmation (Cont.)
Performance Characteristics (12V Input)
Efficiency (%) vs Load Current
90
85
80
75
70
65
60
1 3 5 7 9 11 13 15
Load Current (A)
Load Characteristics (Output vs Load Current)
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
5 10 15
Load Current(A)
20
Gate Waveforms (Io=15A)
DL (10V/DIV)
DH (10V/DIV)
SC2621A
Start up
12V Input (5V/DIV)
1.5V Output (1V/DIV)
3.3V Input (2V/DIV)
2.5V Output (2V/DIV)
X =5 m s /DIV
Transient Response
1.5V Output Response (100mV/DIV)
Step Load Current (10A/DIV)
X =2 0 us /DIV
Short Circuit Protection
Output Short
1.5V OUT (1V/DIV)
PN (10V/DIV)
2007 Semtech Corp.
X =5 0 ns /DIV
11
Output Current (10A/DIV)
X= 5 m s /DIV
www.semtech.com
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet SC2621A.PDF ] | |
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