MD5A SERIES
12/ 24/ 48V
Input
Description
The MD5A is a full-featured, dual output, non-isolated DC-DC
converter providing over 35 watts of power in a small SMT package.
These high efficiency converters have two 5 Amp outputs to power today's
microprocessors, ASICs, and DSPs.
Each output uses an external trim resistor to set the output
voltage, allowing variable control. The outputs come up simultaneously and
each output has a separate on/off control, allowing them to be sequenced.
Both outputs include short circuit protection and have remote sense. A
phase-shifted synchronization approach significantly reduces ripple and
noise on the input line. The MD5A uses Bourns Switch Power's
patented V
2™
technology to ensure extremely fast transient response.
Features
• Dual 5 Amp Outputs
• 90 % Efficiency
• Independently
Programmable Outputs
• Low 0.4 " Profile
• Phase Shifted
Synchronization
• Improved Input Filtering
• Short Circuit Protection
with auto-restart
• Independent Enable for
Sequencing
• Simultaneous Startup
tracking
• Remote Sense
• Fast Transient Response
• High-temperature
Operation
• Accepts Output Pre-charge
• EN55022 Class A
Temperature Regulation
General
MTBF
Operating Temperature
Full Power
Storage Temperature
Switching Frequency
Input
Voltage
Current
Remote Enable
High = Enable
Low = Disable
Common Specifications
Min
10.8
Nom
12
Max
13.2
4
2.3
0.2
Units
Vdc
A
Vdc
Vdc
Notes
each output
Open = Disable
Outputs (each output)
Current
Current Limit
Line Regulation
Load Regulation
Ripple
Dynamic Response
50 to 100 % load
100 to 50 % load
0
6
5
8
±5
±7
20
50
50
50
50
50
±0.01
A
A
mV
mV
mV pp
mV pp
mV
µs
mV
µs
%/°C
over full line range
over full load range
1.25 V
out
(see App Diag)
3.3 V
out
∆i/∆t
= 0.2A/µs
∆i/∆t
= 0.2A/µs
1000
0
0
-55
500
70
55
125
KHrs
°C
°C
°C
KHz
25 °C, 60 % load
See Derating Curve
100 LFM
Asia-Pacific:
TEL +886- (0)2 25624117 • FAX +886- (0)2 25624116
Europe:
TEL +41-41 768 5555 • FAX +41-41 768 5510
The Americas:
TEL +1-951 781 5500 • FAX +1-951 781-5700
Reliable Electronic Solutions
www.bourns.com
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
MD5A SERIES
12/ 24/ 48V
Input
Electrical Specifications
Input
(V)
MD5A-12DA
12
V
out1
(V)
1 - 3.5
I
out1
(A)
5
V
out2
(V)
1 -3.5
I
out2
(A)
5
Noise
Efficiency
(mV pp) max
(%)
50
89
Each output separately adjustable using an external trim resistor from TRIM to GND. See application circuit below.
0
Top View
0.10
0
0.100
0.200
(1)
(2)
(3)
(20)
(19)
(18)
(17)
(16)
(15)
(14)
(13)
(12)
(11)
1.50 (38.1)
Side View
0.40" max
0.20"
1.420
0.500
0.040 typ
0.900
0.080 typ
(6)
(7)
(8)
(9)
(10)
1.10 (27.9)
15 ◊ 0.100
Pin
1, 2, 3
6
7
8, 9,10
11
12, 13
14
15, 16
17
18,19
20
Function
V
in
Enable_
1
Enable_
2
Gnd
Rsns_
2
V
out
_
2
V
set
_
2
Gnd
V
set
_
1
V
out
_
1
Rsns_
1
inches (mm)
0.xx ±0.01 inches
0.xxx ±0.005 inches
0.04" typ
RVset = 22.9/(V
out
- 1) - 5.76 (kΩ)
MD5A-12DA Vset
Vset
1
or
Vset
2
RVset
Vset
1.00
1.25
1.50
1.60
1.80
2.50
3.30
3.50
RVset
Open
82.5K
39.2K
32.4K
22.6K
9.53K
4.32K
3.48K
+
*68µF/20V
Tantalums
+
V
in
V
out1
+
*47µF/6.3V
50m
Al-Polymer
V
out2
+
*47µF/6.3V
50m
Al-Polymer
REV. 02/05
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
51mcu
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