SC4501MSETRT Semtech, SC4501MSETRT Datasheet

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SC4501MSETRT

Manufacturer Part Number
SC4501MSETRT
Description
IC,SMPS CONTROLLER,CURRENT-MODE,TSSOP,8PIN,PLASTIC
Manufacturer
Semtech
Datasheets

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Part Number
Manufacturer
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Part Number:
SC4501MSETRT
Manufacturer:
SEMTECH/美国升特
Quantity:
20 000
Company:
Part Number:
SC4501MSETRT
Quantity:
804
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.
POWER MANAGEMENT
Revision: October 25, 2005
Typical Application Circuit
Description
2.2 F
C1
VIN
5V
f / MHz
1.35
0.7
2
OFF
R
47nF
C3
3
Figure 1(a). 5V to 12V Boost Converter.
22.1
30.9
63.4
/ K
ON
MSOP-8 Pinout
All Capacitors are Ceramic.
8
3
R
4
22.1
9.31
4.75
SHDN
SS
/ K
IN
GND
6
4
SC4501
C
L1
2200
4
820
470
ROSC
/ pF
7
COMP
5
SW
R4
FB
C
6
22
2
1
/ pF
-
-
10BQ015
R3
D1
C4
3.3
10.5
4.7
(Coilcraft DO1813P)
C6
(Falco D08017)
(Falco D08019)
L
1
/ H
174K
R1
20K
R2
12V, 0.7A
VOUT
10 F
C2
1
u Low saturation voltage switch: 220mV at 2A
u Constant switching frequency current-mode control
u Programmable switching frequency up to 2MHz
u Soft-Start function
u Input voltage range from 1.4V to 16V
u Output voltage up to 32V
u Low shutdown current
u Adjustable undervoltage lockout threshold
u Small low-profile thermally enhanced packages
u
u
u
u
u
u
u
Features
Applications
Figure 1(b). Efficiencies of 5V to 12V Boost Converters at
Flat screen LCD bias supplies
TFT bias supplies
XDSL power supplies
Medical equipment
Digital video cameras
Portables devices
White LED power supplies
2Amp, 2MHz Step-Up Switching
95
90
85
80
75
70
65
60
55
50
0.0
10.5 H, 700KHz
700KHz, 1.4MHz and 2MHz.
Regulator with Soft-Start
0.1
0.2
3.3 H, 2MHz
Load Current (A)
Efficiency
0.3
0.4
4.7 H, 1.4MHz
0.5
V
V
IN
OUT
= 5V
= 12V
0.6
www.semtech.com
SC4501
0.7

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