SC4502 datasheet(1/19 Pages) SEMTECH

номер детали	SC4502

подробное описание детали	1.4Amp, 2MHz Step-Up Switching Regulator with Soft-Start

PDF	19 Pages

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производитель	SEMTECH [Semtech Corporation]

домашняя страница	http://www.semtech.com

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POWER MANAGEMENT

1

www.semtech.com

SC4502/SC4502H

1.4Amp, 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 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.

Typical Application Circuit

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.

Revision: July 25, 2005

Figure 1(a). 5V to 12V Boost Converter.

All Capacitors are Ceramic.

C1

2.2

µF

5V

VIN

VOUT

SC4502

2

3

1

6,7

8

4,5

GND

SHDN

SS

IN

SW

FB

ROSC

COMP

10

9

ON

OFF

C3

10BQ015

R4

D1

L1

C2

10

µF

47nF

R2

100K

R1

866K

12V

C4

R3

C6

f

)

z

H

M

(R

3 K

(

)

Ω

R

4 K

(

)

Ω

C

4

)

F

p

(C

6

)

F

p

(L

1 (µ )

H

7

.

02

.

3

37

.

3

20

0

5

1-

)

9

1

0

8

0

D

o

c

l

a

F

(

5

.

0

1

4

.

10

.

9

53

5

.

90

6

5-

)

8

2

D

5

H

R

D

C

a

d

i

m

u

S

(

3

.

5

22

.

3

76

3

.

50

3

32

2)

P

3

1

8

1

O

D

t

f

a

r

c

li

o

C

(

3

.

3

Efficiency

50

55

60

65

70

75

80

85

90

95

0.0

0.1

0.2

0.3

0.4

0.5

Load Current (A)

VOUT = 12V

VIN = 5V

10.5µH, 700KHz

3.3µH, 2MHz

5.3µH, 1.4MHz

Figure 1(b). Efficiencies of 5V to 12V Boost Converters at

700KHz, 1.4MHz and 2MHz.

Аналогичный номер детали - SC4502

производитель	номер детали	датащи	подробное описание детали
Semtech Corporation	SC450	89Kb / 1P	Portable IMVP-IV??and IMVP4??Dual Phase Power Supply Controller
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	SC4501	620Kb / 21P	2Amp, 2MHz Step-Up Switching Regulator with Soft-Start
	SC4501EVB	620Kb / 21P	2Amp, 2MHz Step-Up Switching Regulator with Soft-Start
	SC4501MLTRT	620Kb / 21P	2Amp, 2MHz Step-Up Switching Regulator with Soft-Start

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Аналогичное описание - SC4502

производитель	номер детали	датащи	подробное описание детали
Seiko Instruments Inc	S-8435	2Mb / 42P	STEP-UP SWITCHING REGULATOR
Semtech Corporation	SC4501	620Kb / 21P	2Amp, 2MHz Step-Up Switching Regulator with Soft-Start
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Kingbor Technology Co	KB3302	248Kb / 17P	2Amp, 2MHz Step-up Switching regulator with Soft-Start
Linear Technology	LT3467	268Kb / 16P	1.1A Step-Up DC/DC Converter with Integrated Soft-Start
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Seiko Instruments Inc	S-19243A12A-E8T1U	3Mb / 74P	CMOS VOLTAGE REGULATOR WITH SOFT-START FUNCTION
	S-19243A12H-E8T1U	3Mb / 74P	CMOS VOLTAGE REGULATOR WITH SOFT-START FUNCTION
	S-19254E12H-E8T1U	2Mb / 32P	CMOS VOLTAGE REGULATOR WITH SOFT-START FUNCTION

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SC4502 датащи(PDF) 1 Page - Semtech Corporation

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Аналогичный номер детали - SC4502

Аналогичное описание - SC4502

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