unr-3.3-12-d5 Murata Manufacturing Co., Ltd, unr-3.3-12-d5 Datasheet - Page 4

• Manufacturer Part Number: unr-3.3-12-d5
• Description: Single Output, Non-isolated, 5v-to-2.5v 12 Amp, Dc/dc Converters
• Manufacturer: Murata Manufacturing Co., Ltd

Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
Tel: [phone] [phone] Fax: [phone]
www.murata-ps.com email: [e-mail]
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
notice.
www.murata-ps.com
Performance/Functional Specifications
Typical @ T
 These devices have no minimum load requirements and will regulate under no-load conditions.
 Achieving specified performance requires the installation of an external 470µF input capacitor
 No-load/full-load conditions. When the unit is off, the input "standby" current is typically 10mA.
 See On/Off Control Functionality.
 Output noise may be reduced by installing additional external capacitors across the output terminals.
 Overcurrent detection initiates at approximately 30% above rated load, where the output current "hiccups"
Input Voltage Range
Input Current 
Input Filter Type
Overvoltage Protection
Reverse-Polarity Protection
On/Off Control (Pin 2) 
V
Temperature Coefficient
Ripple/Noise (20MHz BW) 
Line/Load Regulation
Efficiency
Overcurrent Detection Point 
Transient Response (50% load step)
Switching Frequency
Operating Temperature (Ambient):
Storage Temperature
Dimensions
Shielding
Case Connection
Case Material
Pin Material
Weight
with an ESR of 20mΩ and an rms ripple current rating of 6 Amps, as well as an external 22µF
output capacitor with an ESR of 200mΩ or less.
Caps should be selected for low ESR (typically 60mΩ) and located as close to the unit as possible.
at an overage current of 1A and remains there until the short is removed.
OUT
Without Derating
With Derating
Accuracy (50% load)
A
= +25°C under nominal line voltage and full-load conditions unless noted.
Dynamic Characteristics
Environmental
Physical
Output
Input
4.75-5.5 Volts (5V nominal)
0.15/8.8 Amps
Capacitive
None
None
TTL high (or open) = on, low = off
±1% (±33mV) maximum
±0.02% per °C
40mVp-p typical, 80mVp-p maximum
±0.1% maximum/±0.5% maximum
90% typical, 87% minimum
Auto-recovery
30µsec to ±1% of final value
200kHz (±20kHz)
–40 to +50°C
to +100°C (Straight line to 0 Watts)
–40 to +105°C
2" x 1" x 0.44" (51 x 25 x 11.2mm)
5-sided
Pin 5 (Input Return)
Corrosion resistant steel with
non-conductive, epoxy-based, black
enamel finish and plastic baseplate
RoHS: Gold-plate over copper alloy
Non-RoHS: Tin over copper alloy
1.6 ounces (45.4 grams)
© 2008 Murata Power Solutions, Inc.
ISO 9001 REGISTERED
 
04/10/08
4
USA:
Canada: Toronto, Tel: [phone], email: [e-mail]
UK:
France:
Germany: München, Tel: [phone], email: [e-mail]
Japan:
China:
The On/Off Control pin has an internal 5kΩ pull-up resistor to +V
be driven with any logic circuit capable of meeting the following drive require-
ments. Logic "0" = 0 to +0.8V. Logic "1" = +2.0V to +V
–0.7mA. I
transistor can be used. The drive circuit should be rated for more than 5.5V.
Applying a voltage to pin 2 when no input power is applied to the converter can
cause permanent damage to the converter.
On/Off Control Functionality
M E C H A N I C A L S P E C I F I C A T I O N S
O R D E R I N G I N F O R M A T I O N
UNR-3.3/12-D5
UNR-3.3/12-D5-C
Input Voltage
Output Current
Storage Temperature
Lead Temperature (soldering, 10 sec.)
These are stress ratings. Exposure of devices to any of these conditions may adversely
affect long-term reliability. Proper operation under conditions other than those listed in the
Performance/Functional Specifications Table is not implied.
Single Output, Non-Isolated, 5V-to-2.5V
IL
(11.18)
Mansfield (MA), Tel: [phone], email: [e-mail]
Milton Keynes, Tel: [phone], email: [e-mail]
Montigny Le Bretonneux, Tel: [phone], email: [e-mail]
Tokyo, Tel: [phone], email: [e-mail]
Osaka, Tel: [phone], email: [e-mail]
Website: www.murata-ps.jp
Shanghai, Tel: [phone], email: [e-mail]
Guangzhou, Tel: [phone], email: [e-mail]
(20.32)
0.44
(@V
0.800
0.20 MIN
IN
(5.08)
(7.62)
0.300
(2.54)
0.10
= 0V) = –1.1mA. Open collector logic or a single NPN drive
Pin
Technical enquiries email: [e-mail], tel:
1
2
3
4
5
6
Non-Isolated, 5V-to-3.3V, 40 Watt, DC/DC Converter, non-RoHS version
RoHS version
I/O Connections
2
1
DIMENSIONS ARE IN INCHES (MM)
Absolute Maximum Ratings
On/Off Control
Output Return
Logic Ground
Function P9
Input Return
12 Amp, DC/DC Converters
+Output
+Input
Case C5B
BOTTOM VIEW
(50.80)
(45.72)
1.800
2.00
7 Volts
Current limited. Devices can
withstand a sustained output short
circuit without damage.
–40 to +105°C
+300°C
Note:
The case is connected to
pin 5 (Input Return).
3
4
5
6
UNR SERIES
0.200
(5.08)
IN
. I
PINS 1-2: 0.040 ±0.002
PINS 3-6: 0.062 ±0.002
(2.54)
IH
UNR30-40W.B01 Page 4 of 4
0.10
INSULATED BASE
(10.16)
0.400
METAL CASE
(@V
(25.40)
IN
(1.016 ±0.051)
(1.575 ±0.051)
1.00
IN
= +2.0V) =
. It can
[phone]