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UQQ Series

Wide Input Range Single Output DC-DC Converters

MDC_UQQ.D03 Page 5 of 18

UQQ-3.3/25-Q12 UQQ-3.3/25-Q48 UQQ-5/17-Q12

UQQ-5/20-Q48

UQQ-12/8-Q12

UQQ-12/8-Q48

UQQ-15/7-Q12

UQQ-24/4-Q12

DYNAMIC CHARACTERISTICS

Dynamic Load Response

(50-75-50% load step)

50μsec to ±1%

of final value

100μsec to ±1%

of final value

50μsec to ±1%

of final value

95μsec to ±1%

of final value

50μsec to ±1%

of final value

50μsec to ±2%

of final value

Start-up Time

VIN to VOUT regulated

10msec

10msec max

10msec

25msec

10msec

20msec

10msec

10msec

Remote On/Off

to VOUT regulated

5msec

5msec max

5msec

Switching frequency

255 ±25kHz

255 ±25kHz

260 ±25kHz

225-265kHz

260 ±25kHz

245 ±20kHz

260 ±25kHz

260 ±25kHz

ENVIRONMENTAL

Calculated MTBF (4)

TBC

3,360,928

TBC

Operating Temperature Range

See Derating curves

–40 to +85ºC

with Derating

–40 to +57ºC

with Derating

–40 to +85ºC

with Derating

Operating Temperature Range

with baseplate

(no Derating required) (3)(14)

–40 to +105ºC

–40 to +100ºC

–40 to +105°C

–40 to +105ºC

–40 to +105°C

–40 to +100°C

–40 to +105°C

–40 to +105°C

Storage Temperature Range

–55 to +125ºC

Thermal Protection/Shutdown

+120ºC, measured at thermistor T1

Relative humidity

To +85°C/85% non-condensing

PHYSICAL

Outline dimensions

See mechanical specifications

Baseplate material

Aluminum

Pin material

Copper alloy

Pin diameter

0.04/0.062 inches, 1.016/1.524 mm

Weight

1 ounce (28 grams)

Electromagnetic interference

(conducted, external filter

required)

Designed to meet class B, EN55022, CISPR22

Safety

Certified to UL/cUL 60950-1, CSA-C22.2 No.60950-1, IEC/EN 60950-1, 2nd Edition

Flammability

UL 94V-0

Specification Notes:

(1) All models are tested and specified with 300 lfm airflow, external 1 and 10μF paralleled ceramic/

tantalum output capacitors and a 100μF external input capacitor. All capacitors are low ESR

types. These capacitors are necessary to accommodate our test equipment and may not be

required in your applications. All models are stable and regulate within spec under no-load

conditions.

noted.

(2) Input Ripple Current is tested and specified over a 5Hz to 20MHz bandwidth. Input filtering is

(3) Note that Maximum Power Derating curves indicate an average current at nominal input voltage.

At higher temperatures and/or lower airflow, the DC-DC converter will tolerate brief full current

outputs if the total RMS current over time does not exceed the Derating curve. All Derating

curves are presented at sea level altitude. Be aware of reduced power dissipation with increas-

ing altitude.

(4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3,

(5) The On/Off Control may be driven with external logic or by applying appropriate external voltages

which are referenced to Input Common. The On/Off Control Input should use either an open

collector/open drain transistor or logic gate.

(6) Short circuit shutdown begins when the output voltage degrades approximately 2% from the

selected setting.

(7) The outputs are not intended to sink appreciable reverse current.

(8) Output noise may be further reduced by adding an external filter. See I/O Filtering and Noise

Reduction.

(9) All models are fully operational and meet published specifications, including “cold start” at –40°C.

On-board component package temperatures must not exceed +128°C.

(10) Regulation specifications describe the deviation as the line input voltage or output load current is

varied from a nominal midpoint value to either extreme.

(11) Alternate pin length and/or other output voltages are available under special quantity order.

(12) Overvoltage shutdown on 48V input models can be eliminated under special quantity order. OV

shutdown can be deleted in order to comply with certain telecom reliability requirements. These

requirements attempt continued operation despite significant input overvoltage.

(13) Do not exceed maximum power specifications when adjusting the output trim.

(14) Note that the converter may operate up to +105°C with the baseplate installed (+100°C for the

UQQ-3.3/25-Q48). However, thermal self-protection occurs near +120°C Therefore, +105°C is

recommended to avoid thermal shutdown.

(15) If reverse polarity is accidentally applied to the input, to ensure reverse input protection, always

input current rating with nominal input voltage.

(16) For On/Off Control on negative-polarity UQQ-3.3/25-Q48N models, the maximum OFF mode

control voltage is +13.5 Volts. For the ON mode, the range is pin grounded to +1 Volt max.

(17) Always connect the sense pins. If they are not connected to a remote load, connect each sense

pin to its respective output at the converter pins.

(18) Shown at Vin = 10V; after module starts up it operates from 9-36Vdc.

FUNCTIONAL SPECIFICATIONS (CONTINUED)