UM3500 1 of 2 REV.1
UNIVERSAL
MICROELECTRONICS
3,27TH RD., TAICHUNG INDUSTRIAL PARK,
TAICHUNG, TAIWAN, R.O.C.
TEL: 886-4-23590096 FAX: 886-4-23590129
UM3500 SERIES
40 Watts DC-DC Converters
Synchronous-Rectifier Topology
Remote On/Off Control
Continuous Short Circuit Protection
High Efficiency
Non-Isolated
Current Share Function
SPECIFICATIONS
All specifications are typical at nominal line, full load and
25C unless otherwise noted.
INPUT SPECIFICATIONS
Input Voltage Range, 5V ... ... ... ... ... ..... ... ... ... ... 4.75-5.5V
12V ... ... ... ... ... ... .... ... ... ... 10.4-13.6V
Input Filter ... ... ... ... ... ... ... ... ... ... ... ... ..... ... ... ... Capacitive
OUTPUT SPECIFICATIONS
Voltage Accuracy .... ... ... ... ... ... ... ... ... ... ... ... .... 2 % max.
Transient Response(25% Step Load Change) ... .. <500
S
Line Regulation
1
... ..... ... ... ... ... ... ... ... ... ... ... .. 0.5% max.
Load Regulation
2
... ... ... ... ... ... ... ... ... ... ... ..... . 0.7% max.
Ripple and Noise, 20MHz BW
3
... ... ... ... .... 75mV P-P max.
Temperature Coefficient ... ... ... ... ... ... ....0.02%/C max.
Short Circuit Protection .... ... ... ... ... ... ... ..... ... Continuous
Automatic Recovery
GENERAL SPECIFICATIONS
Efficiency .... ... ... ... ... ... ... ... ... ... ... ... ... ... ..... .... See Table
Switching Frequency ... ..... ... ... ... ... ... ... ... ... .. 200KHz typ.
Operating Temperature Range
4
... .... ... .... -25C to +100C
Storage Temperature ....... .... ... ... ... ... ... ... -40C to+105C
Cooling ... ... ... ... ... ... ... ... ... ... ..... ... ... Free Air Convection
Dimensions ... ... ... ... ... ... ... ... .... ... ... ..... 2 x 1 x 0.4 inches
(50.8 x 25.4 x 10.2mm)
Case Material
... ... ... ..... ... ... ... Black-Coated Copper with
Non-Conductive Base
NOTES:
1. Measure from high line to low line.
2. Measure from full load to 1/2 load.
3. Measured with 1uF ceramic cap. Connected to the
output pins.
4. Output Power
100%
Operating
Temperature
-25 50 100 (C)
Maximum case temperature must not be exceeded 100C.
5. UM3500 series can be used as parallel connection to
provide current share function. The current that each
converter delivers will thus be 1/N of the total current, if
there are N total converters in parallel. Limitations to this
scheme are dependent primarily on matching of the
resistances in the converter: mismatch in resistance
results in one converter delivering more current than
another. When using this current share function, Pin
1(SYNC) and Pin 3(PWM) must be connected to each
other or be floating if used as single unit.
REMOTE ON/OFF CONTROL
Logic Compatibility... ... ... ... ... .CMOS or Open Collector TTL
Converter ON.... ... ... ... .... ... ... ... >+2.5 VDC or Open Circuit
Converter OFF... ... ... ... ... ... ... ... .<+0.8 VDC or Short Circuit
Control Common... ... ... ... ... ..... ... .Referenced to Input Minus
Mespek Oy, PL103, 00701 Helsinki
Puh. (09)3507360 Fax (09)3453384
E-mail: mespek@mespek.com
http://www.mespek.com
UM3500 2 of 2 REV.1
UNIVERSAL
MICROELECTRONICS
3,27TH RD., TAICHUNG INDUSTRIAL PARK,
TAICHUNG, TAIWAN, R.O.C.
TEL: 886-4-23590096 FAX: 886-4-23590129
INPUT CURRENT
MODEL
NUMBER
INPUT
VOLTAGE
OUTPUT
VOLTAGE
OUTPUT
CURRENT
NO LOAD
FULL LOAD
%
EFF
(min.)
CASE
UM3501
5 VDC
3.3 VDC
12A
70 mA
9103 mA
87
B
UM3511
12 VDC
3.3 VDC
10A
50 mA
3235 mA
85
B
NOTE: Other output voltage can be supported upon request.
CASE B
PIN CONNECTIONS
Pin
Number
Pin Function
1
SYNC
2
Remote On/Off
3
PWM
4
+Output
5
-Output
6
-Input
7
+Input
All dimensions in inches (mm).
Tolerance .xx
=0.04
.xxx=0.010
(5.08)
0.200"
0.800"
1.00"
0.300"
BOTTOM
2.00"
(50.80)
(45.72)
1.800"
(2.54)
0.10"
0.200"
0.10"
(2.54)
(5.08)
7
6
(7.62)
0.40"
(25.40)
(20.32)
(4.60.5)
(10.20)
5
4
VIEW
0.040"0.005"
(5.08)
0.200"
0.300"
(7.62)
1
2
3
(1.0 DIA.)
0.18"0.02"
(1.6 DIA.)
0.063"0.01"
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