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SC2441 PDF даташит

Спецификация SC2441 изготовлена ​​​​«Semtech Corporation» и имеет функцию, называемую «Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter».

Детали детали

Номер произв SC2441
Описание Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter
Производители Semtech Corporation
логотип Semtech Corporation логотип 

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SC2441 Даташит, Описание, Даташиты
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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SC2441 Даташит, Описание, Даташиты
SC2441
POWER MANAGEMENT
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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 Voltages
Supply Voltage For Step-Down Controller
High-Side Driver Supply Voltages
FB1, FB2 Voltage
COMP1, COMP2 Voltages
CS1(+), CS1(-), CS2(+) and CS2(-)
Voltages
VIN , VPVIN
VCC
VBST1, VBST2
VFB1, VFB2
VCOMP1, VCOMP2
V V , V , VCS1(+), CS1(-) CS2(+) CS2(-)
SYNC/SHDN Voltage
ROSC Voltage
SS1/EN1 AND SS2/EN2 Voltages
Peak Gate Drive Current
Peak VPN1 and VPN2 Output Currents
FB3 Voltage
COMP3 Voltage
PH3 Voltage
Ambient Temperature
Thermal Resistance Junction to Case
Thermal Resistance Junction to Ambient
Storage Temperature Range
Lead Temperature (Soldering) 10 sec
VS/S
VROSC
VSS1, VSS2
IGDH1, IGDH2, IGDL1, IGDL2
IVPN1, IVPN2
VFB3
VCOMP3
VPH3
TA
θJC
θJA
TSTG
TLEAD
Electrical Characteristics
Unless specified: VIN = 2V, VCC = VBST1 = VBST1 =8V, SYNC/SHDN =2V, ROSC = 51.1k, -40°C < TA = TJ < 85°C
Parameter
Symbol
Conditions
-0.3 to 20
-0.3 to 20
-0.3 to 20
-0.3 to 20
-0.3 to 4.5
-0.3 to 20
-0.3 to 20
-0.3 to 5
-0.3 to 6
3
100
4
-0.3 to 2
-0.3 to 35
-40 to 85
13
84
-60 to 150
260
V
V
V
V
V
V
V
V
V
A
mA
V
V
V
°C
°C/W
°C/W
°C
°C
Min Typ Max Units
Undervoltage Lockout
VCC Start Threshold
VCC UVLO Threshold
VCC Operating Current
Channel 1 and 2 Error Amplifiers
VCCTH
VCCTL
ICC
VCC Increasing
VCC Decreasing
VVVCCCCCC<==V88CCVVT,,L,VVVSS//SSS/S===202VVV
4.34
4.65
4.45
14
0.15
10
4.72
21
0.25
13
V
V
mA
Feedback Voltage
Feedback Pin Input Bias Current
Amplifier Transconductance
Open Loop Voltage Gain
Amplifier Unity Gain Bandwidth
VFB1, VFB2
IFB1, IFB2
GM1, GM2
ao1, ao2
VCCTLV<INV=CC3<V 10V
-40°C < TA < 85°C
(Note 1)
0.487 0.496 0.507
-160
400
75
5
-400
V
nA
µΩ−1
dB
MHz
Amplifier Output Sink Current
Amplifier Output Source Current
COMP Threshold for PWM Operation
FB2 Voltage For 2-Phase Single Output
Operation
VFB1, 2 = 1V, VCOMP1,2 = 2.5V
VFB1, 2 = 0V, VCOMP1,2 = 2.5V
VCS1(+)
VCS2(+)
=
=
VCS1(-)
VCS2(-)
=
=
0
0
-40°C < TA < 85°C
20
10
1.3
1.55
32
17
1.7
40
30
2.2
µA
µA
V
V
2005 Semtech Corp.
2
www.semtech.com









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SC2441 Даташит, Описание, Даташиты
SC2441
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless specified: VIN = 2V, VCC = VBST1 = VBST1 =8V, SYNC/SHDN =2V, ROSC = 51.1k, -40°C < TA = TJ < 85°C
Parameter
Symbol
Conditions
Oscillator
Step-down Channel Switching Frequency
Maximum Duty Cycle
Minimum Duty Cycle
SYNC/SHDN Synchronizing Frequency
SYNC/SHDN Input High Voltage
SYNC/SHDN Input Low Voltage
SYNC/SHDN Input Current
Shutdown Delay
f fOSC1, OSC2
DMAX1,
DMAX2
D DMIN1, MIN2
VS/SH
VS/SL
IS/S
ROSC = 51.1k
ROSC = 51.1k
ROSC = 51.1k
ROSC = 51.1k(Note 1)
VVSS//SS
=
=
0.2V
2V
(Note 1)
Current-Sense Amplifiers and Current-Limit Comparators
Current Limit Threshold
Current Limit Threshold
Positive Current-Sense Input Bias Current
Negative Current-Sense Input Bias Current
Minimum PWM On-time
Gate Drivers
VILIM1,
VILIM2
VILIM1,
VILIM2
ICS1(+),
ICS2(+)
I ICS1(-), CS2(-)
VCS1(-)V=CCV=CS28(-V) = 0V
VCS1(-)V=CCV=CS28(-V) = 5V
VCS1(+)
VCS2(-)
=
=
VCS1(-)
VCS2(-)
=
=
0
0
VCS1(+)
VCS2(+)
=
=
VCS1(-)
VCS2(-)
=
=
0
0
TA = 25°C, (Note 1)
High-Side Gate Drive Peak Source Current
(Note 1)
High-Side Gate Drive Peak Sink Current
(Note 1)
Low-Side Gate Drive Peak Source Current
(Note 1)
Low-Side Gate Drive Peak Sink Current
(Note 1)
Gate Drive Rise Time
Gate Drive Fall Time
Low-side Gate Drive to High-side Gate
Drive Non-overlapping Delay
CL = 3300pF
CL = 3300pF
CL = 0
High-side Gate Drive to Low-side Gate
Drive Non-overlapping Delay
CL = 0
Soft-Start, Overload Shutoff and Enable
Soft-Start Charging Current
Soft-Start Voltage to Enable Overload
Shutoff
Overload Shutoff FB Threshold
Soft-Start Discharge Current
Soft-Start Voltage to Recover From
Overload Shutoff
ISS1, ISS2
VSSEN1,
VSSEN2
VFBOL1,
VFBOL2
ISS1(DIS),
ISS2(DIS)
VSSRCV1,
VSSRCV2
VSS1 = VSS2 = 1.5V
VSS1 and VSS2 Increasing
FB1 aVndSS1F, B2 =2 D3e.8cVreasing
VVSFBS11
=
=
VVSFBS22
=
=
0.3V
3.8V
VSS1 and VSS2 Decreasing
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Min Typ Max Units
470 510 550 KHz
88 90
%
0%
1.2 2 MHz
1.5 V
0.5 V
1 µA
50 100
85 µs
40 48 56
40 46.5 56
-0.37
-1
-0.32
180
-1
2
2
2
2
30
30
74
62
mV
mV
µA
µA
ns
A
A
A
A
ns
ns
ns
ns
2.3
3.25
0.348 0.36 0.372
1.4
0.29 0.47 0.63
µA
V
V
µA
V
2005 Semtech Corp.
3
www.semtech.com










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