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Semtech Corporation - Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter

Numéro de référence SC2441
Description Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter
Fabricant Semtech Corporation 
Logo Semtech Corporation 





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SC2441 fiche technique
SC2441
Very Low Input Voltage 2-Phase Synchronous
Step-down Controllers with Swtwewp.D-autapShCeeot4nU.vcoemrter
POWER MANAGEMENT
Description
Features
The SC2441 is a high-frequency triple output switching
regulator controller. It consists of a dual out-of-phase
synchronous step-down PWM controller with high-current
output gate drives and a 1.7A integrated step-up switch-
ing regulator.
The dual-phase step-down controller of the SC2441 can
be configured to provide two individually controlled and
regulated outputs or a single output with shared current
in each phase. The buck controller can operate from an
input voltage of at least 4.72V or they can run off a supply
generated locally with the integrated boost regulator. This
makes the SC2441 ideally suited for applications where a
low-voltage input (3.3V, 2.5V, or 1.8V) is to be stepped
down for lower voltage logic yet the input is too low to
drive power MOSFET’s efficiently. The boost regulator can
be used to provide a third auxiliary output while generat-
ing the bias for the buck controllers.
Both the step-down controllers and the step-up regulator
employ fixed frequency peak current-mode control for fast
transient response. The master oscillator frequency can
be programmed by the user.
Individual soft-start and overload shutdown timer are em-
ployed in each step-down controller for hiccup overload
protection. In single-output configuration, the channel 1
timer controls the soft-start and overload shutdown func-
tions of both controllers.
Typical Application Circuit
2-Phase Synchronous step-down controllers
‹ 2-Phase Synchronous Continuous Conduction Mode
For High Efficiency Step-down Converters
‹ Out of Phase Operation For Low Input Current Ripples
‹ Operates Up To 1MHz Per Channel
‹ Configurable Dual Outputs Or 2-Phase Single Output
Operation with Peak Current Mode Control
‹ Excellent Current Sharing Between Phases
‹ Wide Input Voltage Range: 1.8V to 15V
‹ Duty Cycle Up to 90%
‹ 0.5V Feedback Voltages For Low-Voltage Outputs
‹ Precision 50mV Current-Limit Threshold
‹ Patented Combi-sense Technique for High SNR of Cur-
rent-Sensing
‹ Individual Soft-Start, Overload Shutdown and Enable
Step-up Regulator
‹ Wide Input Voltage Range: 1.8V to 15V
‹ Operates At Twice The Individual Channel Frequency
Of The Buck Controllers
‹ 0.23V VCESAT Switch at 1A
‹ Fixed Frequency with Current-Mode Control
Common Features
‹ External Synchronization
‹ Industrial Temperature Range
Applications
‹ Low Voltage Distributed DC-DC Converters
‹ Telecommunication Power Supplies
‹ Servers and base stations
VIN VINGND
R12 + C38
D1
R14
D2
VO1
VO1GND
C18
C8
+
C25
R9
L1
C20
R5
RCS+1
RCS-1
R17
Figure 1
Revision: January 10, 2005
VIN
+ C1
C2
C19
R10
Q1
D7
Q6
C27
R18 C30
C36
R28
7 FB3
8 COMP3
VIN
28 PVIN
R3
18 BST2
19 GDH2
IN 1
PH3 27
BST1
GDH1
25
23
SC2441
R7
20 GDL2
GDL1 22
PGND 24
2 VPN2
VPN1 26
16 CS2+
CS1+ 4
15 CS2-
CS1- 5
14 FB2
FB1 11
13 COMP2
COMP1 12
GND 9
6 SY NC
Rosc 10
3 SS1/EN1
VCC 21
17 SS2/EN2
C32
C33
U1
L3
R4
R8
R20
1
D3
Q2
Q7
VIN
C3 + C4
C17
D10 C23
R13
L2
R6 C21
RCS+2
C28
C31 R19
RCS-2
R11
R16
VO2
C24
C15
+
VO2GND
US patent 6,441,597 www.semtech.com

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