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SC4521 PDF даташит

Спецификация SC4521 изготовлена ​​​​«Semtech Corporation» и имеет функцию, называемую «3A Step-Down Switching Regulator».

Детали детали

Номер произв SC4521
Описание 3A Step-Down Switching Regulator
Производители Semtech Corporation
логотип Semtech Corporation логотип 

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SC4521 Даташит, Описание, Даташиты
SC4521
3A Step-Down Switching Regulator
with Programmable Soft Start
POWER MANAGEMENT
Description
Features
The SC4521 is a current mode switching regulator with
an integrated switch, operating at 600kHz with
programmable soft start and enable functions. The
integrated switch allows for cost effective low power
solutions (peak switch current 3 amps). High frequency
operation allows for very small passive components.
Current mode operation allows for fast dynamic response
and instantaneous duty cycle adjustment as the input
www.DatavwSahaerlieletp4sUlu.(cgidompeoawl feorr). CPE applications where the input is a
‹ Wide operating voltage range: 4.4V to 24V
‹ Integrated 3 Amp switch
‹ 600kHz frequency of operation
‹ Programmable soft start funchion
‹ Current mode control
‹ Precision enable threshold
‹ SO-8 EDP Lead-free package, fully WEEE and RoHS
compliant
Applications
The low shutdown current makes it ideal for portable
applications where battery life is important.
The SC4521 is an 600kHz switching regulator with a low
pin count.
‹ XDSL modems
‹ CPE equipment
‹ DC-DC point of load applications
‹ Portable equipment
‹ Digtial consumer electronics
The SC4521 allows customers to use large capacitive
loads because its programmable soft start limits the dv/
dt of the output at start up.
Typical Application Circuit
D1
VIN
Enable
C3
2
IN
5
EN
8
SS
C6
1
BST
3
SW
SC4521
6
FB
GND
4
7
COMP
C4
R3
C1
L1
D2
VOUT
R1
C2
R2
Revision: October 5, 2007
1
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SC4521 Даташит, Описание, Даташиты
SC4521
POWER MANAGEMENT
Absolute Maximum Ratings
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. Exposure to Absolute Maximum rated conditions for extended periods of time may
affect device reliability.
Parameter
Symbol
Limits
Units
Input Supply Voltage
VIN -0.3 to +28
V
Boost Pin Above VSW
(VBST - VSW)
16
V
Boost Pin Voltage
VBST
-0.3 to +32
V
EN Pin Voltage
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FB Pin Voltage
VEN -0.3 to +24
VFB -0.3 to +6
V
V
FB Pin Current
IFB 1 mA
SS Pin Voltage
VSS +3
V
Thermal Impedance Junction to Ambient (1)
θJA
36.5 °C/W
Maximum Junction Temperature
TJ 150 °C
Storage Temperature Range
TSTG -65 to +150
°C
Lead Temperature (Soldering) 10 sec
TLEAD
300
°C
ESD Rating (Human Body Model)
ESD
2
kV
Note: (1) ThetaJA is calculated from a package in still air, mounted to 3" x 4.5", 4 layer FR4 PCB with thermal vias under
exposed pad per JESD51 standards.
Electrical Characteristics
Unless specified: VIN = 12V, VCOMP = 0.8V, VBST = VIN + 5V, EN = tied to VIN, SW = open.
TA = TJ = -40°C to 125°C.
Parameter
Symbol
Conditions
Min Typ Max Units
Operating Input Voltage
Maximum Switch Current Limit
Oscillator Frequency
Switch On Voltage Drop
VIN Rising Undervoltage Lockout
VIN UVLO Hysteresis
VIN Supply Current
Standby Current
Thermal Shutdown Trip Point
VIN
ISW
fOSC
VD(SW)
VUVLO
VHYST
IQ
IQ(OFF)
TA = 25°C, D = 50%
ISW = 3A
TJ = 0°C to 85°C
VFB = 1V
VEN = 0V
24
3.5 5.5
500 600 700
220
3.9 4.4
60
3 5.5
250
155
V
A
kHz
mV
V
mV
mA
µA
°C
Thermal Shutdown Hysteresis
10 °C
2007 Semtech Corp.
2
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SC4521 Даташит, Описание, Даташиты
SC4521
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless specified: VIN = 12V, VCOMP = 0.8V, VBST = VIN + 5V, EN = tied to VIN, SW = open.
TA = TJ = -40°C to 125°C.
Parameter
Symbol
Conditions
FB Input Current
Feedback Voltage
Feedback Voltage Line
Regulation
IFB
VFB
4.4V < VIN < 24V(1)
www.DataSFheBett4oUV.coCmOMP Voltage Gain(2)
FB to VCOMP
Transconductance(2)
0.9V VCOMP 2.0V
ICOMP = ± 10µA
VCOMP Pin Source Current
VCOMP Pin Sink Current
VCOMP Pin to Switch Current
Transconductance
VFB = 0.6V
VFB = 1.0V
VCOMP = 1.25V
VCOMP Pin Maximum Switching
Threshold
Duty cycle = 0%
VCOMP OCP Threshold
VCOMP Hiccup Retry Threshold
Maximum Switch Duty Cycle
DMAX
VCOMP rising
VCOMP falling
VCOMP = 1.2V, ISW = 400mA
Min
0.784
Typ
-0.25
0.8
+3
Max
-1
0.816
Units
µA
V
mV/V
150 350
V/V
500 850 1300 µMho
70 110 µA
-70 -110
µA
4.3 A/V
0.6 V
2
0.25
85
V
V
%
Minimum Boost Voltage Above
Switch(2)
2.7
Boost Current
Enable Input Threshold Voltage
Enable Output Bias Current
Soft Start Charging Current (3)
Soft Start Discharging Current
VETH
IEOL
IEOH
ISS
ISS
ISW = 1A
ISW = 3A
EN = 50mV below threshold
EN = 50mV below threshold
VSS = 0
10 15
30 45
1.1 1.27 1.5
8
10
16
-2
Notes:
(1) The required minimum input voltage for a regulated output depends on the output voltage and load condition.
(2) Guaranteed by design.
(3) See Application Information.
V
mA
V
µA
µA
µA
mA
2007 Semtech Corp.
3
www.semtech.com










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