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SC4501MLTRT

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21
POWER MANAGEMENT
1
www.semtech.com
SC4501
2Amp, 2MHz Step-Up Switching
Regulator with Soft-Start
Description
Features
Applications
Flat screen LCD bias supplies
TFT bias supplies
XDSL power supplies
Medical equipment
Digital video cameras
Portables devices
White LED power supplies
The SC4501 is a high-frequency current-mode step-up
switching regulator with an integrated 2A power transis-
tor. Its high switching frequency (programmable up to
2MHz) allows the use of tiny surface-mount external pas-
sive components. Programmable soft-start eliminates high
inrush current during start-up. The internal switch is rated
at 32V making the converter suitable for high voltage ap-
plications such as Boost, SEPIC and Flyback.
The operating frequency of the SC4501 can be set with an
external resistor. The ability to set the operating frequency
gives the SC4501 design flexibilities. A dedicated COMP
pin allows optimization of the loop response. The SC4501
is available in thermally enhanced 8-Pin MSOP and 10-pin
MLPD packages.
Typical Application Circuit
Low saturation voltage switch: 220mV at 2A
Constant switching frequency current-mode control
Programmable switching frequency up to 2MHz
Soft-Start function
Input voltage range from 1.4V to 16V
Output voltage up to 32V
Low shutdown current
Adjustable undervoltage lockout threshold
Small low-profile thermally enhanced packages
Revision: October 25, 2005
C1
2.2μF
5V
VIN
VOUT
SC4501
2
3
1
5
6
4
GND
SHDN
SS
IN SW
FB
ROSC
COMP
8
7
ONOFF
C3
10BQ015
R4
D1
L1
C2
10μF
47nF
R2
20K
R1
174K
12V, 0.7A
C4
R3
C6
Figure 1(a). 5V to 12V Boost Converter.
All Capacitors are Ceramic.
MSOP-8 Pinout
f / MHz R
3
/ KΩ R
4
/ KΩ C
4
/ pF C
6
/ pF L
1
/ μH
0.7 22.1 22.1 2200 -
10.5
(Falco D08019)
1.35 30.9 9.31 820 -
4.7
(Falco D08017)
2 63.4 4.75 470 22
3.3
(Coilcraft DO1813P)
Figure 1(b). Efficiencies of 5V to 12V Boost Converters at
700KHz, 1.4MHz and 2MHz.
Efficiency
50
55
60
65
70
75
80
85
90
95
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
Load Current (A)
Efficiency (%)
V
OUT
= 12V
4.7
μ
H, 1.4MHz10.5
μ
H, 700KHz
3.3
μ
H, 2MHz
V
IN
= 5V
Rev.1 March 24, 2011
2
© 2005 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
SC4501
Absolute Maximum Rating
Electrical Characteristics
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.
Parameter Test Conditions Min Typ Max Unit
Undervoltage Lockout Threshold 1.3 1.4 V
Maximum Operating Voltage 16 V
Feedback Voltage
T
A
= 25°C 1.224 1.242 1.260 V
-40°C < T
A
< 85°C 1.217 1.267 V
Feedback Voltage Line
Regulation
1.5V < V
IN
< 16V 0.01 %
FB Pin Bias Current 40 80 nA
Error Amplifier Transconductance 60
μΩ
−1
Error Amplifier Open-Loop Gain 49 dB
COMP Source Current V
FB
= 1.1V 5
μA
COMP Sink Current V
FB
= 1.4V 5
μA
V
IN
Quiescent Supply Current V
SHDN
= 1.5V, V
COMP
= 0 ( Not Switching ) 1.1 1.6 mA
V
IN
Supply Current in Shutdown V
SHDN
= 0 10 18
μA
Switching Frequency 1.27 1.5 1.77 MHz
Maximum Duty Cycle 85 90
%
Minimum Duty Cycle 0%
Switch Current Limit 2 2.8 A
Switch Saturation Voltage I
SW
= 2A 220 350 mV
Unless specified: V
IN
= 2V, SHDN = 1.5V, R
OSC
= 7.68kΩ, -40°C < T
A
= T
J
< 85°C
Parameter Symbol Typ Units
Supply Voltage V
IN
-0.3 to 18 V
SW Voltage V
SW
-0.3 to 32 V
FB Voltages V
FB
-0.3 to 2.5 V
SHDN Voltage V
SHDN
-0.3 to V
IN
+ 1 V
Operating Temperature Range T
A
-40 to +85 °C
Thermal Resistance Junction to Ambient (MSOP-8)
θ
JA
40
°C/W
Thermal Resistance Junction to Ambient (MLPD-10)
θ
JA
40
Maximum Junction Temperature T
J
160 °C
Storage Temperature Range T
STG
-65 to +150 °C
Lead Temperature (Soldering)10 sec T
LEAD
260 °C
ESD Rating (Human Body Model) ESD 2000 V
2011
3
© 2005 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
SC4501
Pin Configurations Ordering Information
Electrical Characteristics (Cont.)
TOP VIEW
(10 Pin - MLPD, 3 x 3mm)
Device
(1)(2)
Package Temp. Range( T
A
)
SC4501MLTRT MLPD-10
-40 to 85°C
SC4501MSETRT
(3)
MSOP-8-EDP
SC4501EVB Evaluation Board
Notes:
(1) Only available in tape and reel packaging. A reel
contains 3000 devices for MLP package and 2500
devices for MSOP.
(2) Lead free product. This product is fully WEEE and
RoHS compliant and halogen-free.
(3) Contact factory for availability.
1
2
3
4
SSCOMP
TOP VIEW
(8 Pin MSOP-EDP)
5
6
7
8
ROSC
FB
IN
SHDN
SW
GND
Unless specified: V
IN
= 2V, SHDN = 1.5V, R
OSC
= 7.68kΩ, -40°C < T
A
= T
J
< 85°C
Parameter Test Conditions Min Typ Max Unit
Switch Leakage Current V
SW
= 5V 0.01 1
μA
Shutdown Threshold Voltage 1.02 1.1 1.18 V
Shutdown Pin Current
V
SHDN
= 1.2V -4.6
μA
V
SHDN
= 0 0 0.1
μA
Soft-Start Charging Current V
SS
= 0.3V 1.5
μA
Thermal Shutdown Temperature 160 °C
Thermal Shutdown Hysteresis 10 °C
2011
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21

SC4501MLTRT

Mfr. #:
Buy SC4501MLTRT
Manufacturer:
Semtech
Description:
Switching Voltage Regulators 2AMP,2MHZ STEP-UP SW REG W/SS
Lifecycle:
New from this manufacturer.
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