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SC4524B PDF даташит

Спецификация SC4524B изготовлена ​​​​«Semtech Corporation» и имеет функцию, называемую «16V 2A Step-Down Switching Regulator».

Детали детали

Номер произв SC4524B
Описание 16V 2A Step-Down Switching Regulator
Производители Semtech Corporation
логотип Semtech Corporation логотип 

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SC4524B Даташит, Описание, Даташиты
SC4524B
16V 2A Step-Down Switching Regulator
POWER MANAGEMENT
Features
Wide input range: 3V to 16V
2A Output Current
200kHz to 2MHz Programmable Frequency
Precision 1V Feedback Voltage
Peak Current-Mode Control
Cycle-by-Cycle Current Limiting
Hiccup Overload Protection with Frequency Foldback
www.DataSheeSt4oUft.c-Somtart and Enable
Thermal Shutdown
Thermally Enhanced 8-pin SOIC Package
Fully RoHS and WEEE compliant
Applications
XDSL and Cable Modems
Set Top Boxes
Point of Load Applications
CPE Equipment
DSP Power Supplies
LCD and Plasma TVs
Description
The SC4524B is a constant frequency peak current-mode
step-down switching regulator capable of producing 2A
output current from an input ranging from 3V to 16V. The
switching frequency of the SC4524B is programmable
up to 2MHz, allowing the use of small inductors and
ceramic capacitors for miniaturization, and high input/
output conversion ratio. The SC4524B is suitable for
next generation XDSL modems, high-definition TVs and
various point of load applications.
Peak current-mode PWM control employed in the
SC4524B achieves fast transient response with simple loop
compensation. Cycle-by-cycle current limiting and hiccup
overload protection reduces power dissipation during
output overload. Soft-start function reduces input start-
up current and prevents the output from overshooting
during power-up.
The SC4524B is available in SOIC-8 EDP package.
Typical Application Circuit
SS270 REV 4
VIN 10V – 16V
C4
2.2mF
IN
BST
SW
SS/EN SC4524B
COMP
ROSC
FB
GND
C7
10nF
C8
10pF
R7
30.1k
C5
1nF
R5
18.2k
D1
1N4148
C1
0.1mF
L1
6.8mH
R4
102k
OUT
5V/2A
D2
20BQ030
R6
25.5k
C2
22mF
L1: Wurth 744 778 9006
C2: Murata GRM31CR60J226K
C4: Murata GRM31CR61E225K
90
85
80
75
70
65
60
55
50
45
40
0
Efficiency
VIN = 12V
0.5 1 1.5
Load Current (A)
2
Figure 1. 1MHz 10V-16V to 5V/2A Step-down Converter
November 1, 2007










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SC4524B Даташит, Описание, Даташиты
Pin Configuration
SW
IN
ROSC
GND
www.DataSheet4U.com
1
2
9
3
4
8
7
6
5
BST
FB
COMP
SS/EN
(8 - Pin SOIC - EDP)
Marking Information
SC4524B
Ordering Information
Device
SC4524BSETRT(1)(2)
SC4524BEVB
Package
SOIC-8 EDP
Evaluation Board
Notes:
(1) Available in tape and reel only. A reel contains 2,500 devices.
(2) Available in lead-free package only. Device is fully WEEE and RoHS
compliant.
yyww=Date code (Example: 0752)
xxxxx=Semtech Lot No. (Example: E9010)










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SC4524B Даташит, Описание, Даташиты
SC4524B
Absolute Maximum Ratings
Thermal Information
VIN Supply Voltage ……………………………… -0.3 to 24V
BST Voltage ……………………………………………… 40V
BST Voltage above SW …………………………………… 24V
SS Voltage ……………………………………………-0.3 to 3V
FB Voltage …………………………………………… -0.3 to VIN
SW Voltage ………………………………………… -0.6 to VIN
www.DataSShWeeTt4rUan.csoiment Spikes (10ns Duration)……… -2.5V to VIN +1.5V
Peak IR Reflow Temperature …………………………. 260°C
ESD Protection Level(2) ………………………………… 2000V
Junction to Ambient (1) ……………………………… 36°C/W
Junction to Case (1) ………………………………… 5.5°C/W
Maximum Junction Temperature……………………… 150°C
Storage Temperature ………………………… -65 to +150°C
Lead Temperature (Soldering) 10 sec ………………… 300°C
Recommended Operating Conditions
Input Voltage Range ……………………………… 3V to 16V
Maximum Output Current ……………………………… 2A
Exceeding the above specifications may result in permanent damage to the device or device malfunction. Operation outside of the parameters specified in the
Electrical Characteristics section is not recommended.
NOTES-
(1) Calculated from package in still air, mounted to 3” x 4.5”, 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards.
(2) Tested according to JEDEC standard JESD22-A114-B.
Electrical Characteristics
Unless otherwise noted, VIN = 12V, VBST = 15V, VSS = 2.2V, -40°C < TA = TJ < 125°C, ROSC = 12.1kΩ.
Parameter
Conditions
Input Supply
Input Voltage Range
VIN Start Voltage
VIN Start Hysteresis
VIN Quiescent Current
VIN Quiescent Current in Shutdown
Error Amplifier
VIN Rising
VCOMP = 0 (Not Switching)
VSS/EN = 0, VIN = 12V
Feedback Voltage
Feedback Voltage Line Regulation
FB Pin Input Bias Current
Error Amplifier Transconductance
VIN = 3V to 16V
VFB = 1V, VCOMP = 0.8V
Error Amplifier Open-loop Gain
COMP Pin to Switch Current Gain
COMP Maximum Voltage
COMP Source Current
COMP Sink Current
Internal Power Switch
VFB = 0.9V
VFB = 0.8V, VCOMP = 0.8V
VFB = 1.2V, VCOMP = 0.8V
Switch Current Limit
(Note 1)
Switch Saturation Voltage
ISW = -2.6A
Min Typ Max Units
3 16
2.70 2.82 2.95
225
2 2.6
40 50
V
V
mV
mA
µA
0.980
1.000
0.005
-170
280
60
8
2.4
17
25
1.020
-340
V
%/V
nA
µΩ-1
dB
A/V
V
µA
2.6 3.3 4.3
A
250 400 mV











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