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Switching Regulator. SC4517A Datasheet

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Switching Regulator. SC4517A Datasheet






SC4517A Regulator. Datasheet pdf. Equivalent




SC4517A Regulator. Datasheet pdf. Equivalent





Part

SC4517A

Description

1.5A Step-Down Switching Regulator



Feature


1.25MHz, 1.5A Step-Down Switching Regula tor POWER MANAGEMENT Description The SC 4517A is a current mode switching regul ator with an integrated switch, operati ng at 1.25MHz with separate sync & enab le functions. The integrated switch all ows for cost effective low power soluti ons (peak switch current 1.5 amps). The sync function allows customers to sync hronize to a faste.
Manufacture

Semtech Corporation

Datasheet
Download SC4517A Datasheet


Semtech Corporation SC4517A

SC4517A; r clock in order to avoid frequency beat ing in noise sensitive applications. Hi gh frequency of operation allows for ve ry small passive components. Current mo de operation allows for fast dynamic re sponse www.DataSheet4U.com & instantane ous duty cycle adjustment as the input varies (ideal for CPE applications wher e the input is a wall plug power). appl ications where bat.


Semtech Corporation SC4517A

tery life is important. SC4517A Featur es ‹ ‹ ‹ ‹ ‹ ‹ Integrated 1.5 Amp switch 1.25MHz frequency of operation Current mode controller Synchronizable to higher frequency up to 2MHz 6µA low shutdown current MSOP-8 and MLPD-8 Lea d-free packages. This product is fully WEEE and RoHS compliant Applications X DSL modems CPE equipment DC-DC point of load applications Portab.


Semtech Corporation SC4517A

le equipment ‹ ‹ ‹ The low shutdown current makes it ideal for portable ‹ The SC4517A is a 1.25MHz switching regu lator synchronizable to a faster freque ncy from 1.6MHz to 2MHz. Typical Appli cation Circuit D1 1 VIN Enable C3 2 5 8 BST IN SW 3 6 7 C1 L1 VOUT R1 SC45 17AXX EN SYNC FB COMP GND 4 D2 R2 C2 C4 R3 Revision: December 13, 2006 1 www.semtech.com SC.

Part

SC4517A

Description

1.5A Step-Down Switching Regulator



Feature


1.25MHz, 1.5A Step-Down Switching Regula tor POWER MANAGEMENT Description The SC 4517A is a current mode switching regul ator with an integrated switch, operati ng at 1.25MHz with separate sync & enab le functions. The integrated switch all ows for cost effective low power soluti ons (peak switch current 1.5 amps). The sync function allows customers to sync hronize to a faste.
Manufacture

Semtech Corporation

Datasheet
Download SC4517A Datasheet




 SC4517A
POWER MANAGEMENT
Description
The SC4517A is a current mode switching regulator with
an integrated switch, operating at 1.25MHz with separate
sync & enable functions. The integrated switch allows
for cost effective low power solutions (peak switch current
1.5 amps). The sync function allows customers to
synchronize to a faster clock in order to avoid frequency
beating in noise sensitive applications. High frequency
of operation allows for very small passive components.
www.DataC&Shuienrerste4tnUat.ncmtoamondeeouospedruattyiocnycalelloawdsjufsotrmfeanstt
dynamic response
as the input varies
(ideal for CPE applications where the input is a wall plug
power).
The low shutdown current makes it ideal for portable
applications where battery life is important.
SC4517A
1.25MHz, 1.5A Step-Down
Switching Regulator
Features
‹ Integrated 1.5 Amp switch
‹ 1.25MHz frequency of operation
‹ Current mode controller
‹ Synchronizable to higher frequency up to 2MHz
‹ 6µA low shutdown current
‹ MSOP-8 and MLPD-8 Lead-free packages. This
product is fully WEEE and RoHS compliant
Applications
‹ XDSL modems
‹ CPE equipment
‹ DC-DC point of load applications
‹ Portable equipment
The SC4517A is a 1.25MHz switching regulator
synchronizable to a faster frequency from 1.6MHz to
2MHz.
Typical Application Circuit
VIN
Enable
C3
D1
1
2 IN
BST SW 3
SC4517AXX
5 EN
FB 6
8 SYNC
GND
4
COMP 7
C4
C1
L1
D2
R3
VOUT
R1
C2
R2
Revision: December 13, 2006
1
www.semtech.com




 SC4517A
SC4517A
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 (1)
Boost Pin Above VSW
Boost Pin Voltage
EN Pin Voltage
www.DataSheet4U.com
FB Pin Voltage
FB Pin Current
SYNC Pin Current
Thermal Impedance Junction to Ambient (2)
MSOP
MLPD
VIN
(VBST - VSW)
VBST
VEN
VFB
IFB
ISYNC
θJA
-0.3 to +24
16
-0.3 to +32
-0.3 to +16
-0.3 to +6
1
1
185
53
V
V
V
V
V
mA
mA
°C/W
Operating Ambient Temperature Range
TA -40 to +85 °C
Operating Junction Temperature Range
TJ -40 to +150 °C
Storage Temperature Range
TSTG -65 to +150
°C
Lead Temperature (Soldering) 10s (MSOP)
TLEAD
300
°C
Peak IR Reflow Temperature 10-40s (MLPD)
TPKG
260
°C
ESD Rating (Human Body Model)
ESD
2
kV
Notes:
(1) For proper operation of device, VIN should be within maximum Operating Input Voltage as defined in Electrical
Characteristics.
(2) Minimum pad size.
Electrical Characteristics
Unless specified: VIN = 12V, VCOMP = 0.8V, VBST = VIN + 5V, EN = Tied to VIN, SYNC = 0, SW = open.
TA = TJ = -40°C to 125°C.
Parameter
Symbol
Conditions
Min Typ Max Units
Operating Input Voltage (1)
Maximum Switch Current Limit
Oscillator Frequency
Switch On Voltage Drop
VIN Undervoltage Lockout
VIN Standby Current
Shutdown Current
VIN
ISW
fOSC
VD(SW)
VUVLO
IQ
IQ(OFF)
VFB = VOUT(NOM) + 17%
VEN = 0V, VIN = 16V, VSW = 0V
16
1.5
0.9 1.25 1.6
330 550
2.60 3
1.0 5
45
V
A
MHz
mV
V
mA
µA
2006 Semtech Corp.
2
www.semtech.com




 SC4517A
SC4517A
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless specified: VIN = 12V, VCOMP = 0.8V, VBST = VIN + 5V, EN = Tied to VIN, SYNC = 0, SW = open.
TA = TJ = -40°C to 125°C.
PARAMETER
SYMBOL
CONDITIONS
FB Input Current
Feedback Voltage
IFB
SC4517A (adj)
SC4517A (adj),
www.DataSheet4U.com
3V < VIN < 16V(1)
VOUT = VFB
SC4517A-1.8V
SC4517A-2.5V
SC4517A-3.3V
SC4517A-5V
FB Input Resistance
RFB
SC4517A-1.8V
SC4517A-2.5V
SC4517A-3.3V
SC4517A-5V
FB to VCOMP Voltage Gain(2)
FB to VCOMP
Transconductance(2)
VCOMP Pin Source Current
VCOMP Pin Sink Current
VCOMP Pin to Switch Current
Transconductance
VCOMP Pin Maximum Switching
Threshold
VCOMP Pin Threshold
Maximum Switch Duty Cycle
0.4V VCOMP 0.9V
ICOMP = ± 10µA
VFB = VOUT(NOM) - 17%
VFB = VOUT(NOM) + 17%
Duty cycle = 0%
ISW = 1.5A
VCOMP = 1.2V, ISW = 400mA
Minimum Boost Voltage
Above Switch
Boost Current
ISW = 1.5A, 0°C TA 125°C and
ISW = 1.3A, TA < 0°C
ISW = 0.5A
ISW = 1.5A, 0°C TA 125°C and
ISW = 1.3A, TA < 0°C
MIN TYP MAX UNITS
-0.25 -0.50
1.173 1.2 1.227
µA
1.764 1.8 1.836
2.45 2.5 2.55
3.234 3.3 3.366
V
4.9 5 5.1
10.5 15.0 21.0 k
14.7 21.0 30.0
19.0 27.5 39.0
29.0 42.0 60.0
150 350
500 850 1300 µMho
120 160
110 180
2.5
µA
µA
A/V
0.35 V
0.9
80 90
1.8 2.7
V
%
V
10 15 mA
30 45
2006 Semtech Corp.
3
www.semtech.com



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