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SC4502HEVB

Description
2 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PDSO10
CategoryPower/power management   
File Size404KB,19 Pages
ManufacturerSEMTECH
Websitehttp://www.semtech.com
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SC4502HEVB Overview

2 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PDSO10

SC4502/SC4502H
1.4Amp, 2MHz Step-Up Switching
Regulator with Soft-Start
POWER MANAGEMENT
Description
The SC4502/SC4502H is a high-frequency current-mode
step-up switching regulator with an integrated 1.4A
power transistor. Its high switching frequency (program-
mable up to 2MHz) allows the use of tiny surface-mount
external passive components. Programmable soft-start
eliminates high inrush current during start-up. The inter-
nal switch is rated at 32V (40V for the SC4502H) mak-
ing the converter suitable for high voltage applications
such as Boost, SEPIC and Flyback.
The operating frequency of the SC4502/SC4502H can
be set with an external resistor. The ability to set the
operating frequency gives the SC4502/SC4502H design
flexibilities. A dedicated COMP pin allows optimization of
the loop response. The SC4502/SC4502H is available
in thermally enhanced 10-pin MLPD package.
Features
Low saturation voltage switch: 210mV
(250mV for the SC4502H)
Constant switching frequency current-mode control
Programmable switching frequency up to 2MHz
Soft-Start function
Input voltage ranges from 1.4V to 16V
Output voltage up to 32V (40V for the SC4502H)
Low shutdown current
Adjustable undervoltage lockout threshold
Small low-profile thermally enhanced lead free
package. This product is fully WEEE and RoHS
compliant.
Applications
Flat screen LCD bias supplies
TFT bias supplies
XDSL power supplies
Medical equipment
Digital video cameras
Portables devices
White LED power supplies
Typical Application Circuit
VIN
5V
8
OFF ON
C1
2.2µF
3
10
IN
SHDN
SC4502
SS
GND
C3
47nF
4,5
COMP
ROSC
9
R4
C4
6,7
SW
FB
2
1
R3
C6
R2
100K
C2
10µF
L1
D1
10BQ015
VOUT
12V
R1
866K
Efficiency
95
90
85
10.5
µ
H, 700KHz
5.3µ
H, 1.4MHz
Efficiency (%)
80
75
70
65
60
55
50
V
IN
= 5V
V
OUT
= 12V
0.0
0.1
0.2
0.3
0.4
0.5
3.3µ
H, 2MHz
All Capacitors are Ceramic.
f
(MHz)
0.7
1.4
2
R
3
(K
Ω )
R
4
(K
Ω )
33.2
59.0
73.2
23.7
9 .5 3
5.36
C
4
(pF)
1500
560
330
C
6
(pF)
-
-
22
L
1
(µH)
10.5 (Falco D08019)
5.3 (Sumida CDRH5D28)
3.3 (Coilcraf t DO1813P)
Load Current (A)
Figure 1(b). Efficiencies of 5V to 12V Boost Converters at
700KHz, 1.4MHz and 2MHz.
Figure 1(a). 5V to 12V Boost Converter.
Revision: July 25, 2005
1
www.semtech.com

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