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PDF SC2441A Data sheet ( Hoja de datos )
| Número de pieza | SC2441A | |
| Descripción | 1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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SC2441A
1.8V to 20V Input 2-Phase Synchronous
Step-down Controllers with Stwewpw.-DuaptaShCeeot4nU.vceomrter
POWER MANAGEMENT
Description
Features
The SC2441A is a programmable frequency dual
independent or dual/multiple phase single output peak
current-mode step-down switching regulator controller. It
is capable of operating from 1.8V to 20V input. A 0.6A
step-up converter in the SC2441A generates an auxiliary
gate drive supply when VIN is below 4.5V. This makes the
SC2441A well suited for applications where a low-voltage
input (<3.3V) is to be stepped down for lower voltage logic,
yet the input is too low to drive power MOSFETs
efficiently.
The SC2441A employs a phase-locked synchronizing
circuit that allows the step-up converter to operate at
twice the switching frequency of the step-down
controllers for miniaturization. The clock output signal
enables two or more SC2441As to be daisy chained with
programmable phase shift.
2-Phase Synchronous Step-down Controllers
u 2-Phase Synchronous Continuous Conduction Mode
u Out of Phase Operation for Low Input Current Ripple
u Operates up to 1MHz Per Channel
u Excellent Current Sharing Between Phases
u Duty Cycle Up to 90%
u 0.5V Feedback voltages for Low-Voltage Outputs
u Starts into Pre-biased Outputs
u Adaptive Shoot-through Protection
u Lossless Inductor DCR Current Sensing
u 23mV Current-limit Threshold
u Individual Soft-start, Overload Hiccup and Enable
Step-up Regulator
u 0.27V VCESAT Switch at 0.6A
u Fixed frequency Current-mode Control
Common Features
Tying the FB2 pin to VIN makes the second step-down
channel a slave of the first. Operating in this mode, the
SC2441A regulates a single output with shared current in
each channel. Each step-down controller has its own soft-
start and overload shutdown timer for hiccup overload
protection. In the single-output mode, the channel 1 timer
controls the soft-start and overload hiccup of both
controllers.
Typical Application Circuit
u Wide input Voltage Range: 1.8V to 20V
u Synchronizing Frequency Equal to that of the Step-
down Converters
u 28-lead TSSOP-EDP Lead-free package, fully WEEE
and RoHS compliant
Applications
u Low voltage distributed DC-DC converters
u Telecommunication power supplies
u Servers and base stations
Vin
VOU T1
C13
L2
R10
C9
R 15
RCS+1
R19
Signal
Ground
Power
Ground
Revision: March 7, 2006
VCC
C1
D2
C6
C4
Q2
R2
C2
L1
D3
R6
R8
C8
U1
1 IN
27 SW3
21 VCC
25 BST1
23 GDH1
D5 Q4
C19
R20 C21
R11 22 GDL1
24 PGND1
26 PGND2
4 CS1+
5 CS1-
11 FB1
12 COMP1
VCC
R1
FB3
COMP3
7
8
CKOUT
BST2
GD H 2
28
18
19
C3
R5 C5
R7
R9
GDL2 20
R12
D1
R4 R3
Q1
D4
Q3
C7
PLLF
CS2+
CS2-
FB2
COMP2
2
16
15
14
13
C 20
C22
R21
R13
L3
C11
RCS+2
10 ROSC SYNC/SHDN 6
R25 SS1/EN1 3
Vin
R26
9 GND
SS2/EN2 17
C26 R27
C25
SC2441A
VCC
C23 R23
R24
C24
VOUT2
C12
R16
R18
Figure 1
1
www.semtech.com
1 page  
POWER MANAGEMENT
Pin Configurations
IN
PLLF
SS1/EN1
CS1+
CS1-
SYNC/SHDN
FB3
COMP3
GND
ROSC
FB1
COMP1
COMP2
FB2
Top View
1 28
2 27
3 26
4 25
5 24
6 23
7 22
8 21
9 20
10 19
11 18
12 17
13 16
14 15
TSSOP-28 EDP
SC2441A
www.DataSheet4U.com
Ordering Information
Device
SC2441ATETRT(1,2)
Package
TSSOP-28-EDP
Temperature
Range ( TA)
-40 to 85°C
CKOUT
SW3
PGND2
BST1
PGND1
GDH1
GDL1
VCC
GDL2
GDH2
BST2
SS2/EN2
CS2+
CS2-
SC2441AEVB
Evaluation Board
Notes:
(1) Only available in tape and reel packaging. A reel
contains 2500 devices for the TSSOP-28-EDP
package.
(2) Lead free product. This product is fully WEEE and
RoHS compliant.
2006 Semtech Corp.
5
www.semtech.com
5 Page 
POWER MANAGEMENT
SC2441A
www.DataSheet4U.com
4.5V
Vcc
1.25V
3.3V
VSOFT-START
Enable Hiccup
1.85V
VCOMP
PWM
VOUT
Figure 6a. SC2441A Start-up Timing Diagram
VSOFT-START-CAP
VO
70% X VO Setpoint
0.8V 1.25V
3.3V
Enable
Hiccup
1.85V
VCOMP
VO
PWM
0.5V
Disable Hiccup
restart
Figure 6b. SC2441A Overload Hiccup Operation Timing Diagram
2006 Semtech Corp.
11
www.semtech.com
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet SC2441A.PDF ] | |
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