SC20A SERIES
HDLV
Family
Description
The SC20A is a low-cost, 20-Amp, non-isolated DC-DC converter with
an amazingly small footprint of only 0.8 in2. Designed for today's high
power microprocessors, the SC20A accepts either 5 V or 3.3 V inputs and
offers outputs from 1.3 V to 3.3 V. The SC20A also uses an industry-
standard pin-out making it easy to increase power in existing designs.
Using Bourns Switch Power's proprietary V2TM architecture, the SC20A
provides ultrafast transient response, improved line and load regulation, and
very high efficiency. It also incorporates short-circuit protection, Enable / Disable
control, output voltage trim, and remote sense.
Features
• Low Cost
• 20-Amp Output Current
• 90 % Efficiency
• Industry-standard Pin-out
• Low 0.6 " Profile
• Nonisolated Output
• Remote Sense
• Trim Function
• Enable / Disable
• Short-circuit Protection
with auto-restart
• Fast Transient Response
• High-temperature
Operation
• Output Precharge
Capability
Patents 5,770,940
5,978,195
6,127,814
Common Specifications
Min Nom Max Units Notes
Input
Voltage 4.5 5 5.5 Vdc 4.75 Vin Startup
3.0 3.3 3.6 Vdc
Current 20 A
Control Voltage
High = Disable 2.4 Vdc Source 500 mA
Low = Enable 0.4 Vdc Open=Enable
E/D Current 1 mA
Output
Current 20 A
Voltage Setpoint Accuracy ±2 %Vnom
Voltage Trim Range -10 +10 %Vnom
Line Regulation ±0.1 %Vnom
Load Regulation ±0.3 %Vnom
Current Limit 22 25 34 A
Dynamic Response
0 to 20 A load 200 mV ∆i/∆t = 3 A/µs
19 µs
20 to 0 A load 200 mV ∆i/∆t = 3 A/µs
19 µs
Temperature Regulation ±0.02 %Vout/°C
General
MTBF 1,000 kHrs Bellcore TR332, 25 °C
Operating Temperature -25 85 °C
-40 85 °C optional
Storage Temperature -40 125 °C
Switching Frequency 200 300 400 kHz
Reliable Electronic Solutions
Asia-Pacific:
Europe:
The Americas:
www.bourns.com
TEL +886- (0)2 25624117 • FAX +886- (0)2 25624116
TEL +41-41 768 5555 • FAX +41-41 768 5510
TEL +1-951 781 5500 • FAX +1-951 781-5700
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
SC20A SERIES
HDLV
Family
Electrical Specifications
Nominal Output Output Short-circuit Noise Efficiency
Input Voltage Current Current (A) (mV pp) (%)
(V) (V) (A) typ typ typ
SC20A-5S3.3 5 3.3 20 27 100
SC20A-5S2.5 5 2.5 20 27 100
SC20A-5S1.9 5 1.9 20 27 100 89
SC20A-5S1.8 5 1.8 20 27 100
SC20A-5S1.5 5 1.5 20 27 100
SC20A-3S2.5 3.3 2.5 20 27 100
SC20A-3S1.9 3.3 1.9 20 27 100 92
SC20A-3S1.8 3.3 1.8 20 27 100
SC20A-3S1.5 3.3 1.5 20 27 100
Standard Options
Add option designators to the end of the part number. Example; SC20A-5S3.3-B
Option Description
B No Remote Sense option removes sense pin
F 1 % Setpoint Accuracy
Z -40 °C Operation
X Modified pin length followed by three digits (in mils)
Rup Rdown
Trim Up Trim Down
0.37 m
0.24
(6.1)
0.45
(11.43)
0.60
(15.24)
0.65
(16.51)
3.00 (76.2)
0.100 (2.54)
1.400 (35.56)
0.012 (0.30)
typ pin thickness Pin
1,2,4
3
Description
Vout
Remote Sense
(Removed for B option)
Pin
5,6
7,8
9
10
Description
Ground
Vin
Trim
Enable
1.800 (45.72)
12345 678 910
0.123 (3.12)
0.135 ±0.015
(3.43 ±0.38)
0.020 (0.51)
typ pin width
Vin
Trim
10 9 5 6
Enable
Remote Sense - 3
SC20A
7 - Vin
8 - Vin
Vout - 1 Vout
Vout - 2
Vout - 4
100 µf/10 V 100 µf
10 V
0.83
(21.08)
ax
(9.4 max)
Vout
Trim
Gnd
Rup = 8.09 -22 (in kΩ)
V
out - Vnom
All outputs other than 1.5 V V
nom
Trim up when Vnom = 1.5 V
inches (mm)
0.xx ±0.01 inches
0.xxx ±0.005 inches
Note: Component placement may change. Recommended
keep-out area equals maximum length and width.
Rup = 3.176 -10 (in kΩ)
V
out - Vnom
Rdown = 6.04 V
out-8.09 -22 (in kΩ)
V
nom - Vout
All outputs other than 1.5 V V
nom
Trim down when Vnom = 1.5V
Rdown = 2.37 Vout-3.176 -10 (in kΩ)
V
nom - Vout
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
REV. 01/05
