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Электронный компонент: SC4502HMLTRT

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SC4502_SC4502H.P65
background image
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
F
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
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R2
100K
R1
866K
12V
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50
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60
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75
80
85
90
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0.0
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0.3
0.4
0.5
Load Current (A)
Efficiency (%)
V
OUT
= 12V
V
IN
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10.5
H, 700KHz
3.3
H, 2MHz
5.3
H, 1.4MHz
Figure 1(b). Efficiencies of 5V to 12V Boost Converters at
700KHz, 1.4MHz and 2MHz.
background image
2
2005 Semtech Corp.
POWER MANAGEMENT
SC4502/SC4502H
www.semtech.com
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.
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Electrical Characteristics
background image
3
2005 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
SC4502/SC4502H
Pin Configurations
Ordering Information
Electrical Characteristics (Cont.)
TOP VIEW
(10 Pin - MLPD, 3 x 3mm)
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Notes:
(1) Only available in tape and reel packaging. A reel
contains 3000 devices for MLP package.
(2) Lead free product. This product is fully WEEE and
RoHS compliant.
Unless other specified: V
IN
= 2V, SHDN = 1.5V, R
OSC
= 7.68k
, -40C < T
A
= T
J
< 85C
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background image
4
2005 Semtech Corp.
POWER MANAGEMENT
SC4502/SC4502H
www.semtech.com
Block Diagram
SHDN

COMP

ROSC

9

REG_GOOD
EA
-
FB

2

SS
10

REFERENCE
VOLTAGE
3

IN

8

1

CMP
-
+
SUPPLY
INTERNAL
SHUTDOWN
THERMAL
REG
1.1V
1.242V
+
4.6
A
ENABL E
ENABL E
+
R
Q
S
PWM
CLK
-
+
+
CLK
+
-
ISEN

ILIM

+
-
I-LIMIT
GND
4

SW

6

OSCILLATOR
SLOPE COMP
1.5
A
REG
R
SENSE
GND
5

SW

7

Figure 2. SC4502/SC4502H Block Diagram.
Pin Descriptions
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background image
5
2005 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
SC4502/SC4502H
Typical Characteristics
Feedback Voltage vs Temperature
1.15
1.2
1.25
1.3
-50
-25
0
25
50
75
100
125
Temperature (C)
Feedback Voltage (V)
R
OSC
vs Switching Frequency
1
10
100
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Frequency (MHz)
R
OSC
(K
)
V
IN
= 2V
25C
Switching Frequency
vs Temperature
1.3
1.4
1.5
1.6
1.7
-50
-25
0
25
50
75
100
125
Temperature (C)
Frequency (
MHz
)
V
IN
= 12V
V
IN
= 2V
R
OSC
= 7.68K
V
IN
Quiescent Current vs Temperature
0.8
0.9
1
1.1
1.2
1.3
-50
-25
0
25
50
75
100
125
Temperature (C)
V
IN
Current (
m
A
)
V
IN
= 16V
V
IN
= 2V
Not Switching
Shutdown Threshold
vs Temperature
1.00
1.05
1.10
1.15
1.20
-50
-25
0
25
50
75
100
125
Temperature (C)
Shutdown Threshold (V)
V
IN
= 2V
V
IN
Current in Shutdown
vs Input Voltage
0
10
20
30
40
50
0
5
10
15
20
Input Voltage (V)
V
IN
Current (
A)
125C
-40C
V
SHDN
= 0
Minimum V
IN
vs Temperature
1
1.1
1.2
1.3
1.4
1.5
-50
-25
0
25
50
75
100 125
Temperature (C)
Input Voltage (V)
Switch Saturation Voltage
vs Switch Current
0
100
200
300
400
500
0
0.5
1
1.5
2
Switch Current (A)
V
CESAT
(mV)
85C
25C
SC4502
Switch Saturation Voltage
vs Switch Current
0
100
200
300
400
500
0
0.5
1
1.5
2
Switch Current (A)
V
CE
S
A
T
(mV
)
25C
85C
SC4502H