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PDF SC4611 Data sheet ( Hoja de datos )
| Número de pieza | SC4611 | |
| Descripción | Wide Input Range High Performance Synchronous Buck Switching Regulator | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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POWER MANAGEMENT
SC4611
Wide Input Range High Performance
Synchronous Buck Switching Regulator
Description
Features
SC4611 is a high performance synchronous buck controller
that can be configured for a wide range of applications.
The SC4611 utilizes synchronous rectified buck topologies
where high efficiency is the primary consideration. It is
optimized for applications involving multiple and redundant
convertors connected together. The startup is
asynchronous, which keeps the lower side FET off during
soft start. This is a desired feature when a convertor is
turned on with a preset external voltage or pre-bias voltage
www.DataaSlhreeeat4dUy.cpomresent across its output. With the lower FET off,
external bus is not discharged which avoids latch-up of
modern ASIC circuits.
SC4611 comes with a rich set of features like regulated
Vcc supply, soft start, power-good signaling, high current
gate drivers, bootstrapped supply for driving high side N-
channel MOSFETs, shoot through protection, frequency
synchronization and the option for overvoltage crowbar. It
also features multi mode overload protection that includes
continuous current limiting, hiccup mode followed by latch
off. The user has the option of bypassing the hiccup mode
and latch off the output if required.
Typical Application Circuit
Wide input range, 4.5 to 30V
Output voltage as low as 0.5V
2A output drive capability
Asynchronous start up mode
Multimode overcurrent protection with current limit,
hiccup mode and latched shutdown
Overvoltage crowbar protection
Power OK signal
Programmable frequency up to 1 MHz with external
synchronization
–40 to +85 degree C operating temperature
Thermal shutdown
Small package TSSOP-20
Applications
Distributed power architectures
Telecommunication equipment
Servers/work stations
Mixed signal applications
Paralleled synchronous buck convertors
Base station power management
VIN (30V MAX)
Cin
RTN
4 VIN
BST 3
5 BDI
GDH 2
17 AVC C
PH 1
20 P VC C
G D L 19
14 S S /S H
CS+ 7
13 OS C
CS- 6
RT
16 S Y N C
OVP 11
12 C L M
AG N D 15
9 EAO
P G N D 18
8 FB
P OK 10
Revision: November 10, 2004
1
QH
Lout
QL
VOUT (0.5V MIN)
Rcs
Cout
Rclset
RTN
www.semtech.com
1 page  
SC4611
POWER MANAGEMENT
Pin Descriptions
Pin #
1
2
3
Pin Name
PH
GDH
BST
4
www.DataSheet54U.com
6
7
VIN
BDI
CS-
CS+
Pin Function
Switching junction of high side Mosfet source and low side Mosfet drain.
Gate drive output for high side N-Channel MOSFET.
Boost capacitor connection for the high side gate drive.
Connect an external capacitor and a diode as shown in the Typical Application Circuit.
Input supply voltage.
Base drive for AVCC/PVCC regulator.
Inverting input for the current sense comparator
Non inverting input for the current sense comparator
8 FB Feedback input pin.The reference level is 0.5V
9
EAO
Error amplifier output for compensation.
10
POK
Open drain of power good output.
11
OVP
Overvoltage protection input. The reference level is 0.5V
12
CLM
Current Limit Mode select input. Connect to AVCC to enable hiccup or connect to AGND to
bypass hiccup mode.
13
OSC
Connect a resistor to AGND for programming the oscillator frequency.
14 SS/SH Soft start pin. Hold low to shutdown the device.
15 AGND Analog signal ground.
16
SYNC
Oscillator synchronization pin. Connect to AGND if not used.
17 AVCC Supply voltage for analog circuitry.
18 PGND Power ground.
19
GDL
Gate drive output for the low side N-Channel MOSFET.
20 PVCC Supply voltage for output drivers.
2004 Semtech Corp.
5
www.semtech.com
5 Page 
SC4611
POWER MANAGEMENT
Outline Drawing - TSSOP-20
www.DataSheet4U.com
A
N
2X E/2
PIN 1
INDICATOR
ccc C 1 2 3
2X N/2 TIPS
eD
E1 E
e/2
B
aaa C
SEATING
PLANE C
D
A2 A
A1
bxN
bbb C A-B D
DIMENSIONS
DIM
INCHES
MIN NOM MAX
MILLIMETERS
MIN NOM MAX
A-
- .047 -
- 1.20
A1 .002 - .006 0.05 - 0.15
A2 .031 - .042 0.80 - 1.05
b .007 - .012 0.19 - 0.30
c .003 - .007 0.09 - 0.20
D .251 .255 .259 6.40 6.50 6.60
E1 .169 .173 .177 4.30 4.40 4.50
E .252 BSC
6.40 BSC
e .026 BSC
0.65 BSC
L .018 .024 .030 0.45 0.60 0.75
L1 (.039)
(1.0)
N 20
20
01 0° - 8° 0° - 8°
aaa .004
0.10
bbb .004
0.10
ccc .008
0.20
H
GAGE
PLANE
c
SIDE VIEW
0.25
SEE DETAIL A
L
(L1)
DETAIL A
01
NOTES:
1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
2. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE-H-
3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS
OR GATE BURRS.
4. REFERENCE JEDEC STD MO-153, VARIATION AC.
Land Pattern - TSSOP-20
X
(C)
P
GZ
Y
DIM
C
G
P
X
Y
Z
DIMENSIONS
INCHES MILLIMETERS
(.222)
(5.65)
.161 4.10
.026 0.65
.016 0.40
.061 1.55
.283 7.20
NOTES:
1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY.
CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR
COMPANY'S MANUFACTURING GUIDELINES ARE MET.
Contact Information
Semtech Corporation
Power Management Products Division
200 Flynn Road, Camarillo, CA 93012
Phone: (805)498-2111 FAX (805)498-3804
2004 Semtech Corp.
11
www.semtech.com
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet SC4611.PDF ] | |
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