DataSheet26.com

SC471A PDF даташит

Спецификация SC471A изготовлена ​​​​«Semtech Corporation» и имеет функцию, называемую «Synchronous Buck Controller».

Детали детали

Номер произв SC471A
Описание Synchronous Buck Controller
Производители Semtech Corporation
логотип Semtech Corporation логотип 

27 Pages
scroll

No Preview Available !

SC471A Даташит, Описание, Даташиты
PPOOWWEERRMMAANNAAGGEEMMEENNTT
SC471/SC471A
Synchronous Buck Controller with
Multi-Level VOUT Transition Support
Description
Features
The SC471/A is a versatile, constant on-time synchronous
buck, pseudo-xed-frequency, PWM controller intended for
notebook computers and other battery operated portable
devices. The SC471/A contains all the features needed to
provide cost-effective control of system elements needing
voltage slewing. Two integrated switches provide four
resistor-programmable DC output voltages, controlled by
the G0 and G1 inputs.
www.DataSheet4U.com
The output voltage is adjustable from 0.75V to 5V.
Additional features for each output include cycle-by-cycle
current limit, voltage soft-start, under-voltage protection,
programmable over-current protection, soft shutdown,
automatic power save and non-overlapping gate drive.
The SC471/A provides an enable input and a power good
output which is automatically blanked during output
voltage transitions.
The constant on-time topology provides fast dynamic
response. The excellent transient response means that
SC471/A based solutions require less output capacitance
than competing xed-frequency converters. Switching
frequency is constant until a step in load or line voltage
occurs, at which time the pulse density and frequency
will increase or decrease to counter the change in
output voltage. After the transient event, the controller
frequency returns to steady state operation. At light loads,
the automatic power save mode reduces the SC471/A
frequency for improved efciency.
VOUT Programmable 0.75V to 5.25V with Integrated
Transition Support
VBAT Range 3V to 25V
Soft Shutoff at Output
Current Sense Using Low-side RDS(ON) or Resistor
Sensing
Adjustable Cycle-by-Cycle Valley Current Limit
325kHz Fixed-Frequency
Constant On-Time for Fast Dynamic Response and
Reduced Output Capacitance
Automatic Smart Power Save
Internal Soft-Start
Over-Voltage/Under-Voltage Fault Protection
Power Good Output with Transition Blanking
1μA Typical Shutdown Current
500μA Typical Operating Current
Tiny 3×3mm, 16 Pin MLPQ Package
Low External Part Count
Industrial Temperature Range
0.85% Internal Reference
1A/3A Non-Overlapping Gate Drive with
SmartDriver™ Technology
High Efciency > 90%
This Product is Fully WEEE and RoHS Compliant
†Patent Pending
Applications
Notebook/Sub-Notebook Graphics Voltage
Controllers
Tablet PCs
Embedded Applications
September 12, 2006
1
www.semtech.com









No Preview Available !

SC471A Даташит, Описание, Даташиты
POWER MANAGEMENT
Typical Application Circuit
VCC
C4
VBAT
www.DataSheet4U.com
VOUT
C3 Q1
L1
C1
Q2
D1
C2
VCC
SC471/SC471A
G1
G0
R5
1 LX
2 BST
3 VCC
4 DL
EN 12
U1 PGOOD 11
SC471 VOUT 10
FB 9
EN
PGOOD
VOUT
R2 R3
R1 R4
© 2006 Semtech Corp.
2
www.semtech.com









No Preview Available !

SC471A Даташит, Описание, Даташиты
SC471/SC471A
POWER MANAGEMENT
Absolute Maximum Rating
Exceeding the specications below may result in permanent damage to the device or device malfunction. Operation outside of the parameters specied in the
Electrical Characteristics section is not implied. Exposure to Absolute Maximum rated conditions for extended periods of time may affect device reliability.
Parameter
Symbol Min Max
DH, BST to GND (DC)
DH, BST to GND (transient - 100nsec max)
-0.3 +30
-2.0 +33
DL to GND (DC)
DL to GND (transient - 100nsec max)
-0.3 +6.0
-2.0 +6.0
LX to GND (DC)
www.DataSLheXett4oUG.coNmD (transient - 100nsec max)
-0.3 +25
-2.0 +28
BST to LX
-0.3 +6.0
RTN to GND
-0.3 +0.3
VCC to RTN
-0.3 +6.0
D0, D1, EN, FB, G0, G1, ILIM, PGOOD, VOUT to RTN
-0.3 VCC + 0.3
Operating Junction Temperature Range
Storage Temperature Range
Thermal Resistance, Junction to Ambient(1)
Peak IR Reow Temperature, (10-40sec)
ESD Rating (Human Body Model)
TJ
TSTG
θJA
TPKG
-40 +125
-65 +150
45
+260
2
Note:
1) Calculated from package in still air, mounted 3” x 4.5”, 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards.
Units
V
V
V
V
V
V
V
oC
oC
oC/Watt
oC
kV
Electrical Characteristics
Test Conditions: VBAT = 15V, VOUT = 1.5V, TA = 25 oC, 0.1% resistor dividers; VCC = 5.0V.
Parameter
Conditions
25°C
Min Typ Max
-40° to 85°C
Min Max
Units
Input Supplies
VBAT Input Voltage
3.0 25
V
VCC Input Voltage
VCC Shutdown Current
VCC Operating Current
EN = 0V
FB > 0.8V
4.5 5.5
1
500
5
1000
V
μA
μA
Controller
FB On-Time Threshold
0 to 85°C
-40 to 85°C
Output Voltage Adjust Range(1)
D0/D1 Pull-Down Resistance
D0/D1 to RTN;
SC471 G0/G1 = 5V; SC471A G0/G1 = 0V
0.75
15
0.7436 0.7564
0.7425 0.7575
0.75 5.25
40
V
V
Ω
© 2006 Semtech Corp.
3
www.semtech.com










Скачать PDF:

[ SC471A.PDF Даташит ]

Номер в каталогеОписаниеПроизводители
SC471Synchronous Buck ControllerSemtech Corporation
Semtech Corporation
SC471ASynchronous Buck ControllerSemtech Corporation
Semtech Corporation

Номер в каталоге Описание Производители
TL431

100 мА, регулируемый прецизионный шунтирующий регулятор

Unisonic Technologies
Unisonic Technologies
IRF840

8 А, 500 В, N-канальный МОП-транзистор

Vishay
Vishay
LM317

Линейный стабилизатор напряжения, 1,5 А

STMicroelectronics
STMicroelectronics

DataSheet26.com    |    2020    |

  Контакты    |    Поиск