UNR-2.5/10-D3T [MURATA]

Analog Circuit, Hybrid;


型号：	UNR-2.5/10-D3T
厂家：	muRata
描述：	Analog Circuit, Hybrid
文件：	总8页 (文件大小：224K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

UNR D3 SERIES

www.murata-ps.com

Single Output, Non-Isolated, 3.3VIN to 1.5/1.8/2.5VOUT

8 and 10 Amp DC/DC Converters

OBSOLETE PRODUCT

Last time buy: 3 March 2014

Click here for more information.

If your DSP and CPLD core logic are demanding more 1.5V, 1.8V or 2.5V

Features

current from your 3.3V system, don’t pay to derive more isolated power from your

intermediate dc bus. Murata Power Solutions’ new, 3.3V-input, UNR "D3" models

derive 10 Amps

■

3.0-3.6V input range; Non-isolated

1.5V, 1.8V or 2.5V output @ 10A

2" x 1" through-hole or SMT package

Gull-wing leads for SMT package

Full synchronous-rectiﬁer topology

300kHz switching; Planar magnetics

High efﬁciency, to 89%

of low-voltage current right from your 3.3V supply. These non-isolated power

converters exploit full synchronous rectiﬁcation, planar magnetics, and 100% auto-

mated assembly to deliver high efﬁciencies (to 89%), low noise (typically 80mVp-p),

and low costs. Housed in 1" x 2" shielded metal cases, UNR D3’s offer standard

through-hole ("T" models) or SMT ("SM" models) packaging.

The new "gull-wing" SMT packages (with metal shells and non-conductive

plastic baseplates) weigh less than 40 grams and can withstand peak lead tem-

peratures up to +300°C.

These versatile DC/DC’s are fully line ( 0.1% max.) and load ( 0.5% max.)

regulated. They feature quick transient response (25µsec), user-optional on/off

control (for power sequencing), and output overcurrent detection and shutdown

("hiccup" technique with auto-recovery). Their impressive guaranteed efﬁciencies

enable them to deliver fully rated output power from –40 to +50/55°C (ambient)

without supplemental cooling.

If your high current requirements have made the use of inefﬁcient linear regula-

tors impractical, take a look at one of Murata Power Solutions’ new switching buck

regulators. Their high efﬁciency, ease-of-use, long-term reliability, and overall cost

effectiveness will impress you. Safety agency approvals and EMC characterizations

are currently in progress.

Low noise, 80mVp-p

Quick transient response, 25µsec

V^OUTuser-trimmable from 1.28V to 3V

–40 to +50/55°C ambient operation with

no derating

■

Remote on/off control; Output

overcurrent detection

IEC950/EN60950/UL1950 pending

EMC compliant

+VIN

+VOUT

INPUT

RETURN

OUTPUT

RETURN

LOGIC

GROUND

VOLTAGE

BOOST

OVERCURRENT

DETECTION

+VCC

ON/OFF

CONTROL

PWM

CONTROLLER

REFERENCE &

ERROR AMP

VOUT

TRIM

Figure 1. Simpliﬁed Schematic

Typical topology is shown.

For full details go to

www.murata-ps.com/rohs

www.murata-ps.com/support

MDC_UNR15-25W.C01 Page 1 of 8

UNR D3 SERIES

Single Output, Non-Isolated, 3.3VIN to 1.5/1.8/2.5VOUT

8 and 10 Amp DC/DC Converters

➀

Performance Speciﬁcations and Ordering Guide

Output

Input

Package

R/N (mVp-p)

➁

Regulation (Max.)

Efﬁciency

VOUT

IOUT

VIN Nom.

Range

➄

IIN

➃

(Case,

➅

Root Model

(Volts)

1.5

(Amps)

Typ. Max.

Line

0.1ꢀ

Load

➂

(Volts)

3.3

(Volts)

3.0-3.6

(mA/A)

375/5.74

275/6.38

370/8.51

Min.

80ꢀ

82.5ꢀ

83ꢀ

85ꢀ

Typ.

83.5ꢀ

85.5ꢀ

89ꢀ

Pinout)

UNR-1.5/10-D3T

UNR-1.5/10-D3SM

UNR-1.8/10-D3T

UNR-1.8/10-D3SM

UNR-2.5/10-D3T

UNR-2.5/10-D3SM

125

0.5ꢀ

C16A2, P23

C18, P25

1.5

0.5ꢀ

3.3

1.8

3.3

C16A2, P23

C18, P25

1.8

3.3

2.5

3.3

C16A2, P23

C18, P25

2.5

3.3

89ꢀ

➂ These devices have no minimum-load requirements and will regulate under no-load conditions.

➃ Nominal line voltage, no-load/full-load conditions.

➄ The lowest input voltage for startup under full load is 3.1V minimum. Once started, the input voltage

may decay to 3.0V. Lighter loads will allow 3.0V startup.

➀ Typical at TA = +25°C under nominal line voltage and full-load conditions, unless otherwise

noted. All models are tested and speciﬁed with an external 470µF input capacitor with a 20mΩ

ESR and a 6Arms ripple-current rating, as well as a 22µF output capacitor with a 200mΩ ESR.

See I/O Filtering and Noise Reduction for more details.

➅

These are only partial model numbers. Refer to the part number structure when ordering.

➁ Ripple/Noise (R/N) is tested/speciﬁed over a 20MHz bandwidth. Output noise may be further

reduced by installing additional external output caps. See I/O Filtering and Noise Reduction.

M E C H A N I C A L S P E C I F I C A T I O N S

0.100

(2.54)

0.110

(2.79)

2.00

(50.80)

METAL CASE

0.39

(9.91)

0.800

(20.32)

Case C18

Pinout P25

1.00

(25.40)

INSULATED BASE

4 EQ. SP. @

0.200 (5.08)

0.500

(12.70)

0.300

(7.62)

PINS 1-2, 4: 0.040 0.002

(1.016 0.051)

0.20 MIN

(5.08)

PINS 3, 5-7: 0.062 0.002

(1.575 0.051)

TOP VIEW

0.10

(2.54)

0.10

(2.54)

1.800

(45.72)

2.00

(50.80)

0.110

(2.79)

0.300

(7.62)

0.800

(20.32)

4 EQ. SP. @

0.200 (5.08)

0.015

(0.38)

0.060

(1.52)

Case C16A2

Pinout P23

1.00

(25.40)

0.43

(10.92)

INSULATED BASE

0.015

(0.38)

0.055

(1.40)

BOTTOM VIEW

METAL CASE

0.10

(2.54)

DIMENSIONS ARE IN INCHES (MM)

DIMENSIONS IN INCHES (MM)

I/O Connections

Function P23

Logic Ground

On/Off Control

+Output

Function P25

Logic Ground

On/Off Control

N.C.

T E M P E R A T U R E D E R A T I N G

Trim

N.C.

Output Return

Input Return

+Input

+Output

Trim

Output Return

Input Return

+Input

UNR-2.5/10-D3

No Pin

P A R T N U M B E R S T R U C T U R E

UNR-1.8/10-D3

UNR-1.5/10-D3

D3 SM

U NR

1.8 10-

RoHS-6 compliant*

Output Conﬁguration:

U = Unipolar

Packaging:

T = Through-Hole Package

Non-Isolated

SM = Surface-Mount Package

Nominal Output Voltage:

Input Voltage Range:

1.5, 1.8 or 2.5 Volts

D3 = 3.0 to 3.6 Volts (3.3V nominal)

–40

Maximum Rated Output

100

Current in Amps

Ambient Temperature ( C)

* Contact Murata Power Solutions Technologies (DATEL) for availability.

See Temperature Derating section in Technical Notes for more details.

www.murata-ps.com/support

MDC_UNR15-25W.C01 Page 2 of 8

UNR D3 SERIES

Single Output, Non-Isolated, 3.3VIN to 1.5/1.8/2.5VOUT

8 and 10 Amp DC/DC Converters

Performance/Functional Speciﬁcations

➀ All models are tested and speciﬁed with an external 470µF input capacitor with a 20mΩ

ESR and a 6Arms ripple-current rating, as well as a 22µF output capacitor with a 200mΩ ESR.

See I/O Filtering and Noise Reduction for more details. These devices have no minimum-load

requirements and will regulate under no-load conditions. Listed speciﬁcations apply for both

"T" and "SM" models as appropriate.

Typical @ T

= +25°C under nominal line voltage and full-load conditions unless noted.

➀

Input

Input Voltage Range

3.0 to 3.6 Volts (3.3V nominal) ➈

➁ See Output Overcurrent Detection for details.

➂ See On/Off Control for details.

➃ See Output Voltage Trimming for details.

➄ For all models, output noise can be further reduced with the installation of additional

external output capacitors. See I/O Filtering and Noise Reduction for details.

➅ Output overcurrent detection initiates at approximately 40ꢀ above rated load (14 Amps). Under

overload or short-circuit conditions, output current "hiccups" at approximately 1 Amp average

and remains at that level until the overload is removed. See Output Overcurrent Detection.

➆ See Start-Up Time for details.

Input Current:

Normal Operating Conditions

Standby/Off Mode

See Ordering Guide

3.6mA typical, 8mA maximum

500mA typical, 700mA maximum

Output Short Circuited ➁ ➅

Input Ripple Current:

UNR-1.5/10-D3, UNR-1.8/10-D3

UNR-2.5/10-D3

150mAp-p

50mAp-p

➇ See Temperature Derating for details.

➈ The lowest input voltage for startup under full load is 3.1V minimum. Once started, the input

voltage may decay to 3.0V. Lighter loads will allow 3.0V startup

Input Filter Type

Capacitive

None

Overvoltage Protection

Reverse-Polarity Protection

On/Off Control ➂

Absolute Maximum Ratings

None

On = open or 2V to +VIN; IIN = 800µA max.

Off = 0-0.8V; I^IN= 1.2mA max.

Input Voltage:

Continuous

5 Volts

6.3 Volts

Output

Transient (100msec)

VOUT Accuracy (50ꢀ load):

UNR-1.5/10-D3

Input Reverse-Polarity Protection

Input/Output Overvoltage Protection

Output Current

None

1ꢀ ( 15mV) maximum

1ꢀ ( 18mV) maximum

1ꢀ ( 25mV) maximum

UNR-1.8/10-D3

Current limited. Devices can

withstand a sustained output

short circuit without damage.

UNR-2.5/10-D3

V^OUTTrim Range ➃

Trim pin tied to +Output:

UNR-1.5/10-D3, UNR-1.8/10-D3

UNR-2.5/10-D3

Storage Temperature

–40 to +105°C

+300°C

V^OUT= 1.28 Volts or less

V^OUT= 1.52 Volts or less

V^OUT= 3.0 Volts or greater

Lead Temperature (Soldering, 10 sec.)

Trim pin tied to Output Return

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.

Temperature Coefﬁcient

Ripple/Noise (20MHz BW) ➄

Line/Load Regulation

Efﬁciency

0.02ꢀ per °C

See Ordering Guide

Overcurrent Protection: ➅

Technique

"Hiccup" with auto-recovery

140ꢀ of rated current

T E C H N I C A L N O T E S

Overcurrent Detection Point

Average Output Current

1 Amp typical, 3 Amps maximum

Return Current Paths

Dynamic Characteristics

These are non-isolated DC/DC converters. The Input Return, Output Return

and Logic Ground pins are all connected together internally. To the extent

possible, all input and load currents should be returned through the Input

Return and Output Return, respectively (via low-impedance runs). Any con-

trol signals applied to the On/Off Control pin should be referenced to Logic

Ground. The internal trace leading to Logic Ground is not designed to carry

high current. Consequently, devices should never be installed in a manner

that results in high current ﬂow through Logic Ground (i.e., the Input/Output

Return pins should never be left open or connected via high-impedance paths).

Transient Response (50ꢀ-75ꢀ step)

25µsec to 2.5ꢀ of ﬁnal value

Start-Up Time: ➆

VIN to VOUT

25/30msec (1.8/2.5VOUT models)

On/Off to V^OUT

Switching Frequency

300kHz ( 30kHz)

Environmental

Operating Temperature (Ambient): ➇

Without Derating

–40 to +50/55°C

With Derating

to +100°C (See Derating Curves)

I/O Filtering and Noise Reduction

Storage Temperature

–40 to +105°C

Physical

All UNR 15-25W Series converters are tested and speciﬁed with external

470µF input capacitors (20mΩ ESR, 6Arms ripple-current rating) and

external 22µF output capacitors (200mΩ ESR). External input capacitance is

required and must be rated to handle the input ripple current as follows:

Dimensions:

Through-Hole Models

Surface-Mount Models

2" x 1" x 0.39" (51 x 25 x 9.9mm)

2" x 1" x 0.43" (51 x 25 x 10.9mm)

Shielding

5 sided

Case Connection

Case Material

Input/Output Return

V^OUT

VOUT

VIN

IRMS = IOUT

(1 –

)

Corrosion-resistant steel with

√

VIN

non-conductive, epoxy-based, black

enamel ﬁnish and plastic baseplate

In critical applications, input/output ripple/noise may be further reduced by

installing additional I/O caps.

Pin Material

Weight

RoHS: Gold-plate over copper alloy

Non-RoHS: Pure tin on copper alloy with

nickel underplate

1.4 ounces (39.7 grams)

www.murata-ps.com/support

MDC_UNR15-25W.C01 Page 3 of 8

UNR D3 SERIES

Single Output, Non-Isolated, 3.3VIN to 1.5/1.8/2.5VOUT

8 and 10 Amp DC/DC Converters

External input capacitors serve primarily as energy-storage elements. They

should be selected for bulk capacitance (at appropriate frequencies), low

ESR, and high rms-ripple-current ratings. The switching nature of modern

DC/DC converters requires that dc input voltage sources have low ac imped-

ance, and highly inductive source impedances can affect system stability.

Your speciﬁc system conﬁguration may necessitate additional considerations.

+INPUT

1kΩ

ON/OFF

CONTROL

Output ripple/noise (also referred to as periodic and random deviations or

PARD) can be reduced below speciﬁed limits using ﬁltering techniques, the

simplest of which is the installation of additional external output capacitors.

Output capacitors function as true ﬁlter elements and should be selected for

bulk capacitance, low ESR, and appropriate frequency response. Any scope

measurements of PARD should be made directly at the DC/DC output pins

with scope probe ground less than 0.5" in length.

LOGIC

GROUND

Figure 2. Driving the On/Off Control Pin

All external capacitors should have appropriate voltage ratings and be

located as close to the converters as possible. Temperature variations for all

relevant parameters should be taken into consideration.

Applying an external voltage to the On/Off Control pin when no input power

is applied to the converter can cause permanent damage to the converter.

The on/off control function, however, is designed such that the converter

can be disabled (control pin pulled low) while input power (system 3.3V

power) is ramping up and then "released" once the input has stabilized.

The time duration between the point at which the converter is released and

its fully loaded output settles to within speciﬁed accuracy can be found in

the Performance/Functional Speciﬁcations Table. See Start-Up Time for more

details.

The most effective combination of external I/O capacitors will be a function

of your line voltage and source impedance, as well as your particular load

and layout conditions. Our Applications Engineers can recommend potential

solutions and discuss the possibility of our modifying a given device’s internal

ﬁltering to meet your speciﬁc requirements. Contact our Applications Engi-

neering Group for additional details.

Input Fusing

Start-Up Time

UNR 15-25W D3 Series DC/DC converters are not internally fused. Certain

applications and or safety agencies may require the installation of fuses at

the inputs of power conversion components. For Murata Power Solutions

UNR D3 Series DC/DC converters, you should use either slow-blow or

normal-blow fuses with values no greater than the following.

The V^INto VOUT Start-Up Time is the interval between the time at which a

ramping input voltage crosses the lower limit of the speciﬁed input voltage

range (3.0 Volts) and the fully loaded output voltage enters and remains within

it speciﬁed accuracy band. Actual measured times will vary with input source

impedance, external input capacitance, and the slew rate and ﬁnal value of

the input voltage as it appears to the converter.

Output Voltage

1.5V Models

1.8V Models

2.5V Models

Fuse Value

11 Amps

12 Amps

18 Amps

The On/Off to V^OUTStart-Up Time assumes the converter is turned off via

the Remote On/Off Control with the nominal input voltage already applied to

the converter. The speciﬁcation deﬁnes the interval between the time at which

the converter is turned on and the fully loaded output voltage enters and

remains within its speciﬁed accuracy band. See Typical Performance Curves

for details

Input Overvoltage and Reverse-Polarity Protection

UNR D3 Series DC/DC converters do not incorporate either input overvoltage

or input reverse-polarity protection. Input voltages in excess of the listed

absolute maximum ratings and input polarity reversals of longer than "instan-

taneous" duration can cause permanent damage to these devices.

Output Overvoltage Protection

UNR D3 Series DC/DC converters do not incorporate output overvoltage

protection. In the extremely rare situation in which the device’s feedback loop

is broken, the output voltage may run to excessively high levels (V^OUT= VIN).

If it is absolutely imperative that you protect your load against any and all

possible overvoltage situations, voltage limiting circuitry must be provided

external to the power converter.

On/Off Control

The On/Off Control pin may be used for remote on/off operation. UNR D3

Series DC/DC converters are designed so that they are enabled when the

control pin is pulled high or left open (normal mode) and disabled when the

control pin is pulled low (to less than +0.8V relative to Logic Ground). As

shown in Figure 2, both 2.5V^OUTand 1.8VOUT models have internal 1kΩ pull-

up resistors to V^IN(+Input).

Output Overcurrent Detection

Overloading the output of a power converter for an extended period of

time will invariably cause internal component temperatures to exceed their

maximum ratings and eventually lead to component failure. High-current-

carrying components such as inductors, FET's and diodes are at the highest

risk. UNR D3 Series DC/DC converters incorporate an output overcurrent

detection and shutdown function that serves to protect both the power

converter and its load.

Dynamic control of the on/off function is best accomplished with a mechani-

cal relay or open-collector/open-drain drive circuit. The drive circuit should

be able to sink appropriate current when activated and withstand appropriate

voltage when deactivated.

www.murata-ps.com/support

MDC_UNR15-25W.C01 Page 4 of 8

UNR D3 SERIES

Single Output, Non-Isolated, 3.3VIN to 1.5/1.8/2.5VOUT

8 and 10 Amp DC/DC Converters

When the output current of a thermally stabilized converter exceeds the

maximum rating (10A) by 40ꢀ (typical) to 80ꢀ (maximum), the internal over-

current detection circuit automatically shuts down the converter by discharg-

ing the soft-start circuit of the pulse width modulator (PWM). In this off state,

which is similar to that achieved by pulling the On/Off Control low, the output

voltage quickly drops as the output capacitors discharge into the load. Since

there is no longer any output current, the overcurrent detection circuit is

released, allowing the soft-start circuit to recharge and the converter to turn

on again. If the faulty load condition persists, the overcurrent detection circuit

will again discharge the soft-start circuit and shut down the converter. This

continuous on/off cycling of the converter is referred to as “hiccup mode.”

Once the overload condition is removed, the converter remains on, and the

output voltage is quickly restored to its regulated value.

+OUTPUT

Trim

+INPUT

Down

LOAD

TRIM

INPUT

Trim Up

RETURN

OUTPUT

RETURN

Note: Install either a ﬁxed trim-up resistor or a ﬁxed trim-down resistor

depending upon desired output voltage.

Figure 4.Trim Connections Using Fixed Resistors

Trim-Resistor Equations for 2.5V^OUTDevices

VOUT = VOUT Desired

The components used to sense the output current have large temperature

coefﬁcients. Consequently, in a “cold-start” situation, the Overcurrent Detec-

tion Point may temporarily move to 80ꢀ to 120ꢀ above the rated current

speciﬁcation. The device quickly heats up, particularly if an overload situation

exists, and restores the normal (40ꢀ) Overcurrent Detection Point. The

device easily survives starting up into an output-short-circuit condition.

7500 (V^OUT–1.267)

R^TRIM(Ohms) =

–1740

Trim Down

2.5 – VOUT

9465

The overcurrent detection circuitry helps keep internal current levels and

operating temperatures within safe operating limits. Nevertheless, sustained

operation at current levels above the rated output current (10 Amps) but

below the Overcurrent Detection Point (typically 14 Amps) may result in

permanent damage to the converter (unless active cooling keeps internal

temperatures below safe limits).

Trim Up RTRIM (Ohms) =

–1740

VOUT – 2.5

Trim-Resistor Equations for 1.8V^OUTDevices

V^OUT= VOUT Desired

2670 (V^OUT–1.267)

Output Voltage Trimming

Trim Down R^TRIM(Ohms) =

Trim Up RTRIM (Ohms) =

1.8 – VOUT

For 2.5V^OUTdevices, the output can be trimmed to any voltage between

1.52V and 3.0V. For 1.5V^OUTand 1.8VOUT devices, the output can be trimmed

to any voltage between 1.28V and 3.0V. Trimming is accomplished with either

a trimpot or a single ﬁxed resistor. The trimpot should be connected between

+Output and Output Return with its wiper connected to the Trim pin as shown

in Figure 3 below.

3380

VOUT – 1.8

Trim-Resistor Look-Up Table for Common Output Voltages

1.8VOUT Models

2.5VOUT Models

Desired Output

Voltage (Volts) Trim Resistor (Ω)

Connect To

+Output

Open

Trim Resistor (Ω)

N.A.

Connect To

N.A.

+OUTPUT

1.28

1.52

1.8

2.07k

Open

16.9k

4.83k

3.38k

2.82k

+Output

Open

+INPUT

4.03k

9.35k

Open

29.7k

17.15k

20kΩ

5-10

Turns

–Output

TRIM

LOAD

2.5

2.8

INPUT

–Output

RETURN

OUTPUT

RETURN

Temperature Derating

Figure 3.Trim Connections Using a Trimpot

The outstanding electrical efﬁciency of the UNR D3 Series' synchronous-

rectiﬁer design and the excellent thermal conductivity of its encapsulated

metal package combine to eliminate the need for heat sinking or supplemen-

tal forced-air cooling in the majority of routine applications. As shown in

the derating curves on page 2, 2.5V^OUTmodels deliver full rated output

power (25 Watts) up to +55°C (ambient) and then derate linearly to +100°C.

1.8V^OUTmodels deliver full rated output power (18 Watts) up to +50°C

(ambient) and similarly derate linearly to +100°C.

A trimpot can be used to determine the value of a single ﬁxed resistor

which should be connected, as shown in Figure 4, between the Trim pin and

+Output to trim down the output voltage, or between the Trim pin and Output

Return to trim up the output voltage. Fixed resistors should be metal-ﬁlm

types with absolute TCR’s less than 100ppm/°C to ensure stability.

The equations and look-up table below can be used as starting points for

selecting speciﬁc trim-resistor values. Recall that untrimmed devices are

guaranteed to be 1ꢀ accurate.

When operated with 3.0V input voltages, all devices in the UNR D3 Series

are more efﬁcient and can operate to +60°C and +55°C, respectively. At

3.6V^IN, devices operate less efﬁciently, and maximum full-load ambient

temperatures are reduced to +45°C and +50°C, respectively.

www.murata-ps.com/support

MDC_UNR15-25W.C01 Page 5 of 8

UNR D3 SERIES

Single Output, Non-Isolated, 3.3VIN to 1.5/1.8/2.5VOUT

8 and 10 Amp DC/DC Converters

Recommended PC Board Layout

SMT Solder Process for SM models

If necessary, a single pc board layout can accommodate both through-hole

and SMT models of the UNR D3 Series. Note that on page 2 of this data

sheet, the through-hole package is drawn with a bottom view of its pin

locations, and the surface-mount package is drawn with of top view of its

pin locations. As shown below, the through-hole pin locations, when viewed

from above, fall just inside (on 1.8 inch centers) the SMT pin locations (which

essentially begin on 2.1 inch centers). The table below shows how the pin

functions align.

For the surface-mount "SM" models of the UNR Series, the packages’ gull-

wing leads are made of tin-plated (150 microinches) copper. The gull-wing

conﬁguration, as opposed to “J” leads, was selected to keep the solder joints

out from under the package to minimize both, heat conduction away from the

leads (into the encapsulated package) and shadowing effects.

"SM" modules do not currently withstand the standard solder-reﬂow process

with its most common temperature proﬁles. In order to avoid damage to the

converter a selective solder process (i.e. hot air gun or a hand soldering

method) with the following parameters must therefore be chosen :

1.800

0.10

(45.72)

(2.54)

Pre-heat phase 30-60°C rise/minute to 150°C maximum.

Lead temperature 300°C for 10 seconds maximum.

0.800

(20.32)

4 EQ. SP. @

0.200 (5.08)

1.00

(25.40)

Case C16A2

As shown in Figure 6, our tests have determined the optimal landing-pad size

to be 160 mils by 130 mils (4 x 3.3 mm).

0.300

(7.62)

TOP VIEW

0.10

(2.54)

PINS 1-2, 4: 0.040 0.002 (1.016 0.051)

PINS 3, 5-7: 0.062 0.002 (1.575 0.051)

+INPUT

POWER

GROUND

ON/OFF CONTROL

TRIM

+OUTPUT

0.100

(2.54)

0.110

(2.79)

0.800

(20.32)

4 EQ. SP. @

0.200 (5.08)

1.00

(25.40)

Case C18

0.015

(0.38)

0.500

(12.70)

0.300

(7.62)

TOP VIEW

0.10

(2.54)

SMT

Pin Number

Through-Hole

Pin Number

0.110**

(2.79)

Pin Function

N.C.

0.100**

(2.54)

0.130*

(3.30)

No Pin

N.C.

0.160*

(4.06)

On/Off Control

Logic Ground

+Input

* PAD DIMENSION

** LEAD DIMENSION

Input Return

Output Return

Trim

Figure 6 . PC Board Land Pattern

+Output

Figure 5. Recommended Board Layout

www.murata-ps.com/support

MDC_UNR15-25W.C01 Page 6 of 8

UNR D3 SERIES

Single Output, Non-Isolated, 3.3VIN to 1.5/1.8/2.5VOUT

8 and 10 Amp DC/DC Converters

T Y P I C A L P E R F O R M A N C E C U R V E S

VIN to VOUT Start-Up Time

UNR-1.8/10-D3 Models

(VIN = 3.3V, IOUT = 10A, 22µF output capacitor.)

UNR-2.5/10-D3 Models

(VIN = 3.3V, IOUT = 10A, 22µF output capacitor.)

VIN

1V/div

VOUT

1V/div

VOUT

1V/div

4msec/div

On/Off Control to VOUT Start-Up Time

UNR-1.8/10-D3 Models

(VIN = 3.3V, IOUT = 10A, 22µF output capacitor.)

UNR-2.5/10-D3 Models

(VIN = 3.3V, IOUT = 10A, 22µF output capacitor.)

VCONTROL

1V/div

VCONTROL

1V/div

VOUT

1V/div

4msec/div

www.murata-ps.com/support

MDC_UNR15-25W.C01 Page 7 of 8

UNR D3 SERIES

Single Output, Non-Isolated, 3.3VIN to 1.5/1.8/2.5VOUT

8 and 10 Amp DC/DC Converters

T Y P I C A L P E R F O R M A N C E C U R V E S

Efﬁciency vs. Output Current and Input Voltage

UNR-1.5/10-D3 Models

(Guaranteed efficiency = 80% at VIN = 3.3V and IOUT = 10A)

UNR-2.5/10-D3 Models

(Guaranteed efficiency = 85% at VIN = 3.3V and IOUT = 10A)

IN = 3.0V

IN = 3.3V

IN = 3.6V

IN = 3.3V

VIN = 3.0V

VIN = 3.6V

Load Current (Amps)

UNR-1.8/10-D3 Models

(Guaranteed efficiency = 82.5% at VIN = 3.3V and IOUT = 10A)

C U S T O M C A P A B I L I T I E S

Murata Power Solutions’ world-class design, development and manufactur-

ing team stands ready to work with you to deliver the exact power converter

you need for your demanding, large volume, OEM applications. And . . .

we’ll do it on time and within budget!

IN = 3.0V

Our experienced applications and design staffs; quick-turn prototype

capability; highly automated, SMT assembly facilities; and in-line SPC qual-

ity-control techniques combine to give us the unique ability to design and

deliver any quantity of power converters to the highest standards of quality

and reliability.

IN = 3.3V

We have compiled a large library of DC/DC designs that are currently used

in a variety of datacom/telecom, medical, computer, railway, aerospace and

industrial applications. We may already have the converter you need.

VIN = 3.6V

tive power converters available.

Load Current (Amps)

This product is subject to the following operating requirements

and the Life and Safety Critical Application Sales Policy:

Refer to: http://www.murata-ps.com/requirements/

Murata Power Solutions, Inc.

11 Cabot Boulevard, Mansﬁeld, MA 02048-1151 U.S.A.

ISO 9001 and 14001 REGISTERED

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/support

MDC_UNR15-25W.C01 Page 8 of 8

UNR-2.5/10-D3T [MURATA]

相关型号：

UNR-2.5/10-D3T-C

UNR-2.5/10-D5

UNR-2.5/10-D5SM

UNR-2.5/10-D5T

UNR-2.5/10-D5T-C

UNR-2.5/12-D5

UNR-2.5/2-D5

UNR-2.5/2-D5SM

UNR-2.5/8-D12

UNR-2.5/8-D5

UNR-3.3/10-D12

UNR-3.3/10-D12SM