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Semtech Corporation

SC2441A Datasheet Preview

SC2441A Datasheet

1.8V to 20V Input 2-Phase Synchronous Step-down Controllers

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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




Semtech Corporation

SC2441A Datasheet Preview

SC2441A Datasheet

1.8V to 20V Input 2-Phase Synchronous Step-down Controllers

No Preview Available !

SC2441A
POWER MANAGEMENT
www.DataShe
Absolute Maximum Rating
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified
in the Electrical Characteristics section is not implied.
Parameter
Symbol
Maximum Ratings
Units
Input Voltage
Supply Voltage For Step-Down Controller
High-Side Driver Supply Voltages
FB1, FB2 Voltage
COMP1, COMP2 Voltages
CS1(+), CS1(-), CS2(+) and CS2(-)
Voltages
VIN
VCC
VBST1, VBST2
VFB1, VFB2
VCOMP1, VCOMP2
V V , V , VCS1(+), CS1(-) CS2(+) CS2(-)
-0.3 to 20
-0.3 to 20
-0.3 to 28
-0.3 to 20
-0.3 to 4.5
-0.3 to VCC
V
V
V
V
V
V
SYNC/SHDN Voltage
ROSC Voltage
SS1/EN1 AND SS2/EN2 Voltages
FB3 Voltage
SW3 Voltage
Maximum Junction Temperature
Thermal Resistance Junction to Case
Thermal Resistance Junction to Ambient
Storage Temperature Range
Lead Temperature (Soldering) 10 sec
ESD Ratings (Human Body Model)
VS/S
VROSC
VSS1, VSS2
VFB3
VSW3
TJ
θJC
θJA
TSTG
TLEAD
ESD
-0.3 to VIN+1
-0.3 to 2
-0.3 to 4
4
-0.3 to 30
150
2
37
-60 to 150
300
2000
V
V
V
V
V
°C
°C/W
°C/W
°C
°C
V
Electrical Characteristics
Unless specified: VIN = 2V, VCC = VBST1 = VBST2 =8V, SYNC/SHDN =2V, ROSC = 51.1k, -40°C < TA = TJ < 105°C
Parameter
Symbol
Conditions
Min
Undervoltage Lockout
VCC Start Threshold
VCC UVLO Hysteresis
VCC Input Current
Channel 1 and 2 Error Amplifiers
VCCTH
VCCTL
ICC
VCC Increasing
VCC Decreasing
VCVCCVC=C=C4=V8V,8V,VVC,CSVT/SLS,=/SV=0SV/2S V=(22)V
Feedback Voltage
VFB1, VFB2
VIN = 3V, 5V < VCC < 10V
VIN
=
3V, 5V <
-40°C to
8V5C°CC<
10V,
0.494
0.495
Feedback Pin Input Bias Current
Amplifier Transconductance
Open Loop Voltage Gain
Amplifier Unity Gain Bandwidth
IFB1
IFB2
GM1, GM2
ao1, ao2
(Note 1)
Amplifier Output Sink Current
Amplifier Output Source Current
VFB1, 2 = 1V, VCOMP1,2 = 2.5V
VFB1, 2 = 0V, VCOMP1,2 = 2.5V
19
9
Typ
4.45
150
10
0.05
8
0.500
0.500
-60
-280
315
75
5
24
13
Max Units
4.55 V
mV
15 mA
1.0
11
0.506
0.505
V
V
-200
-500
29
16
nA
nA
µΩ−1
dB
MHz
µA
µA
2006 Semtech Corp.
2
www.semtech.com


Part Number SC2441A
Description 1.8V to 20V Input 2-Phase Synchronous Step-down Controllers
Maker Semtech Corporation
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SC2441A Datasheet PDF






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