DataSheet.jp

SC2441 の電気的特性と機能

SC2441のメーカーはSemtech Corporationです、この部品の機能は「Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter」です。


製品の詳細 ( Datasheet PDF )

部品番号 SC2441
部品説明 Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter
メーカ Semtech Corporation
ロゴ Semtech Corporation ロゴ 




このページの下部にプレビューとSC2441ダウンロード(pdfファイル)リンクがあります。

Total 30 pages

No Preview Available !

SC2441 Datasheet, SC2441 PDF,ピン配置, 機能
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

1 Page





SC2441 pdf, ピン配列
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
www.DataSheet4U.com
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


3Pages


SC2441 電子部品, 半導体
SC2441
POWER MANAGEMENT
Pin Descriptions
Pin Pin Name Pin Function
www.DataSheet4U.com
1 IN Power Supply Voltage for the Analog Section of the Boost Converter.
The Virtual Phase (Unloaded) Node of the Second Step-down Converter. Used for "Combi"
2
VPN2
current sense only. This pin is left open when sensing current with a sense resistor at the
converter output.
An external capacitor tied to this pin sets (i) the soft-start time (ii) output overload latch off time
3 SS1/EN1 for step-down converter 1. Pulling this pin below 0.5V shuts off the gate drivers for the first
controller.
4
CS1+
The Non-inverting Input of the Current-sense Amplifier/Comparator for the Step-down
Controller 1.
5
CS1-
The Inverting Input of the Current-sense Amplifier/Comparator for the Step-down Controller 1.
Normally tied to the output of the converter.
Synchronization and Shutdown Input. For normal operation, tie this pin to a voltage above
1.5V. To shut-off both step-down controllers and the boost regulator, force this pin to a voltage
6
SYNC/SHDN
less than 0.5V. The master oscillator can be synchronized by driving this pin with an external
cfrleoqckue(necxytewrnhaelrfeCaLKs>thferesqtueepn-dcyowsentcwointhtroRllOerSsCo)p. eTrhaetebaotohsat lcf othnevecrltoecrkrufrnesqautetnhcey.external clock
7
FB3
The Inverting Input of the Error Amplifier for the Boost Converter. FB3 is tied to an external
resistive divider for output3 voltage setting.
8
COMP3
The Error Amplifier Output of the Boost Converter. This pin is used for loop compensation.
Pulling this pin below 0.4V disables the step-up converter.
9
GND
Analog Signal Ground.
10
ROSC
An external resistor connected from this pin to GND sets the oscillator frequency.
11
FB1
The Inverting Input of the Error Amplifier for the Step-down Controller 1. Tie to an external
resistive divider between OUTPUT1 and the ground for output voltage sensing.
12
COMP1
The Error Amplifier Output for Step-down Controller 1. This pin is used for loop compensation.
13
COMP2
The Error Amplifier Output for Step-down Controller 2. This pin is used for loop compensation.
The Inverting Input of the Error Amplifier for the Step-down Controller 2. Tie to an external
14
FB2
resistive divider between output2 and the ground for output voltage sensing. Tie to IN or VCC
for two-phase single output applications
15
CS2-
The Inverting Input of the Current-sense Amplifier/Comparator for the Step-down Controller 2.
Normally tied to the output of the converter.
16
CS2+
The Non-inverting Input of the Current-sense Amplifier/Comparator for the Step-down
Controller 2
An external capacitor tied to this pin sets (i) the soft-start time (ii) output overload latch off time
17
SS2/EN2
for step-down converter 2. Pulling this pin below 0.5V shuts off the gate drivers for the second
controller. Leave open for two-phase single output applications.
18
BST2
Bootstrapped Supply for the High-side Gate Drive 2. Connect to a bootstrap capacitor and an
external diode as described in application information.
19
GDH2
Gate Drive Output for the High-side N-channel MOSFET of Output 2. Gate drive voltage
swings from ground to VBST2.
20
GDL2
Gate Drive Output for the Low-side N-channel MOSFET of Output 2. Gate drive voltage
swings from ground to VCC.
2005 Semtech Corp.
6
www.semtech.com

6 Page



ページ 合計 : 30 ページ
 
PDF
ダウンロード
[ SC2441 データシート.PDF ]


データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。


共有リンク

Link :


部品番号部品説明メーカ
SC2440

2.5 MHz Dual Switching Regulator

Semtech Corporation
Semtech Corporation
SC2441

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

Semtech Corporation
Semtech Corporation
SC2441A

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

Semtech Corporation
Semtech Corporation
SC2442

High Performance Wide Input Range Dual Synchronous Buck Controller

Semtech Corporation
Semtech Corporation


www.DataSheet.jp    |   2020   |  メール    |   最新    |   Sitemap