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參數(shù)資料
| 型號： | SC2441ATETRT |
| 廠商： | Semtech Corporation |
| 英文描述： | 1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| 中文描述： | 1.8V至20V的輸入2相同步降壓與升壓轉(zhuǎn)換器控制器 |
| 文件頁數(shù)： | 1/37頁 |
| 文件大?。?/td> | 1024K |
| 代理商： | SC2441ATETRT |
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POWER MANAGEMENT
Description
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.
1
www.semtech.com
SC2441A
1.8V to 20V Input 2-Phase Synchronous
Step-down Controllers with Step-up Converter
Revision: March 7, 2006
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.
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
Features
2-Phase Synchronous Step-down Controllers
2-Phase Synchronous Continuous Conduction Mode
Out of Phase Operation for Low Input Current Ripple
Operates up to 1MHz Per Channel
Excellent Current Sharing Between Phases
Duty Cycle Up to 90%
0.5V Feedback voltages for Low-Voltage Outputs
Starts into Pre-biased Outputs
Adaptive Shoot-through Protection
Lossless Inductor DCR Current Sensing
23mV Current-limit Threshold
Individual Soft-start, Overload Hiccup and Enable
Step-up Regulator
0.27V V
CESAT
Switch at 0.6A
Fixed frequency Current-mode Control
Common Features
Wide input Voltage Range: 1.8V to 20V
Synchronizing Frequency Equal to that of the Step-
down Converters
28-lead TSSOP-EDP Lead-free package, fully WEEE
and RoHS compliant
Applications
Low voltage distributed DC-DC converters
Telecommunication power supplies
Servers and base stations
Figure 1
R21
C3
Vin
RCS+2
C21
R26
VCC
R23
R2
VCC
C8
D4
R11
U1
27
24
19
18
11
26
6
4
28
12
3
5
17
13
14
8
15
16
2
7
25
23
22
20
21
10
9
1
SW3
PGND1
GDH2
BST2
FB1
PGND2
SYNC/SHDN
CS1+
CKOUT
COMP1
SS1/EN1
CS1-
SS2/EN2
COMP2
FB2
COMP3
CS2-
CS2+
PLLF
FB3
BST1
GDH1
GDL1
GDL2
VCC
ROSC
GND
IN
R15
R16
R19
VOUT1
R1
C22
L2
R8
VCC
Signal
C24
R9
R24
C26
R13
Power
R4
L3
C25
Q3
C6
Q2
R10
R18
L1
C5
C20
C7
R20
R25
R12
D1
C19
C23
D2
C13
D3
Q4
R7
R3
C11
D5
VOUT2
Vin
C4
C2
C1
R27
RCS+1
R6
R5
C9
Q1
C12
SC2441A
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SC2441 | Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441EVB | Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441ITSTRT | Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2442 | High Performance Wide Input Range Dual Synchronous Buck Controller |
| SC2442H | High Performance Wide Input Range Dual Synchronous Buck Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC2441EVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter |
| SC2441ITSTRT | 制造商:Semtech Corporation 功能描述:Controller IC |
| SC2442 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:High Performance Wide Input Range Dual Synchronous Buck Controller |
| SC2442H | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:High Performance Wide Input Range Dual Synchronous Buck Controller |
| SC2442HITSTR | 制造商:Semtech Corporation 功能描述: |
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