ECRI Microelectronics

HNDO5S3R3 Military Point of Load DC to DC converters (POL)

1 Features of HNDO5S3R3 Point of Load DC/DC Converters (POL)

High reliability 

Low voltage input:3V~5.5V,Typical 5V

High conversion efficiency

Output Power PO:16.5W

Operating temperature Tc:-55℃~+125℃

Low start-up current

No output overshoot   

Inhibit function

Output over current and short circuit protection

Maximum power density:80W/in3

Hermetically sealed metal case



2 Scope of application of HNDO5S3R3 Military Point of Load DC to DC converter (POL)

High-reliability electronic system for ground ,vehicle ,radar , aviation and aerospace, etc

3 Description of HNDO5S3R3 Military Point of Load DC to DC converter (POL)

HNDO5S3R3 is a high reliable, output voltage adjustable non-isolated DC to DC converter with BUCK circuit topology and pulse width modulation principle. The output sampling voltage is directly feedbacked to modulate the pulse width to achieve closed-loop control to meet the stability of the voltage output requirements. By changing the external resistance method to achieve the output voltage 0.8V-3.3V adjustable.. The series of products are made by thick-film hybrid integrated production process, metal sealed package. The design and manufacturing process of HNDO5S3R3 Series converters are in compliance with MIL-PRF-38534.

4 Technical Specifications of HNDO5S3R3 Military Point of Load DC to DC converter (POL)

Table 2 Rated conditions and recommended operating conditions

Absolute Max. Rating

Input voltage:3V~5.5V

Input voltage(Transient,1s):6V

Output Power:18.2W

Storage temperature:-65℃~150℃

Mechanical Shock:1500g

Lead solderable temperature:300℃(15s)

Weight:13.5g



Table 3 Electrical characteristics

Items

Conditions

(Unless other wise,

-55℃≤Tc≤125℃,

VIN=5V±0.15V)

HNDO5S3R3

Unit

Min

Max

Output voltage

VIN=3V~5.5V,IO=5A

0.8

2.5

V

VIN=4V~5.5V,IO=5A

2.5

3.3

Output current

VIN=3V~5.5V

-

5

A

Output ripple voltage

(Peak-peak)

TA=25℃

IO=5A,Vo=3.3V

BW =10kHz~2MHz

-

35

mV

Load regulation

IO=0→5A,Vo=3.3V

-

40

mV

Efficiency

Vo=3.3V,Io=4A

93

-

%

Insulation resistance

TA=25℃,impose 500V DC voltage between case and any pin (Expect pin 3)

100

-

Inhibite voltage

TA=25℃,Vo=3.3V,IO=5A

0

0.8

V

Start-up Delay

Input voltage VIN:0→5V,Vo=3.3V

No load

-

10

ms

Start-up Overshoot(peak)

Input voltage VIN:0→5V,Vo=3.3V

No load

-

200

mV



5 Circuit block diagram of HNDO5S3R3 Military Point of Load DC to DC converter (POL)

circuit-block-diagram

6 Typical Characteristic Curve (Testing condition as per Tc=25℃,VIN=5V±0.15V, Vo=3.3V,full load. unless otherwise specified) of HNDO5S3R3 Military Point of Load DC to DC converter (POL)

typical-characteristic-curve
Fig 3 HNDO5S3R3 Efficiency curve


Fig 4 HNDO5S3R3 Load
hndo5s3r3-load


Fig 5 HNDO5S3R3 Overshoot/Start-up Delay

mtbf-curve
Fig 6  MTBF Temperature Curve(HNDO5S3R3)
(Ground good condition is expected)

8 Pin Designations of HNDO5S3R3 Military Point of Load DC to DC converter (POL)

pin-designations

Figure 7 Bottom View
Table 4 Pin Designation

Pin

Symbol

Designation

1

NC

NC

2

VIN

Input

3

GNDC

Case ground

4

VO

Output

5

GND

Common GND

6

VTR

Output Trimming

7

INH

Inhibit


9 Typical Connection Diagram of HNDO5S3R3 Military Point of Load DC to DC converter (POL)

In fig 8,By adjusting the external resistor Rtr,can achieve different output voltage,Rtr and VO relationship is shown as follow:



Vo(V)

Rtr(kΩ) reference

3.3

3.3

2.6

6.55

2.5

7.25

0.8

NC


inhibit-driver-circuit-diagram
Fig 9 Inhibit Driver Circuit Diagram
In fig 9,By adjusting the external capacitor, can extended circuit start-up delay time.
(C=0.1μF, Delay time extension 3ms, Depending on the output situation)
input-recommended-connection

In fig 10, By adjusting the parameters of inductance and capacity, can reduce the input ripple voltage.
(When L=4.7uH,C1=100uF ,C2=47 uF,Input ripple voltage is 100mV, Depending on the output situation)

10 Package Specifications of HNDO5S3R3 Military Point of Load DC to DC converter (POL)


Fig 11 Bottom View                                   Fig 12 Side View

Table 5  Package Outline

Symbols

Unit/mm

Minimum

Nominal

Maximum

A

-

-

7.36

Φb1

0.32

-

0.58

Φb2

0.87

-

1.13

D

-

-

25.14

E

-

-

20.66

e a

-

5.08

-

e1 a

-

12.70

-

e2 a

-

7.62

-

Z

2.62

-

3.22

L

5.40

-

-

a e、e1、e2 interchangeability dimensions are guaranteed by the manufacture and inspection of the enclosure,this specification is not required as an assessment.

Table 6  Case Materials

Case Model

Header

Header Plating

Cover

Cover Plating

Pin

Pin Plating

Sealing

Notes

UPP2520-07

Cold Rolled Steel(10#)

Ni

Iron-nickel alloy(4J42)

Ni

Copper –core Compound

Au

Compression



11 Ordering Information of HNDO5S3R3 Military Point of Load DC to DC converter (POL)

11-ordering-information


fig-11-part-numbering-key-1

Application Notes:
☆  Both positive and negative terminals for power supply shall be correctly connected when power is applied so as to avoid permanent damage to the device.
☆  Testing position shall be the root of the pin of the device when the electrical characteristic is measured.
☆  The baseplate of the device shall be closely attached to the circuit board during device mounting so as to avoid the damage on pins. The shockproof actions shall be adopted when necessary.
☆  Pins shall not be bended to avoid the glass insulator cracking and case leaking.
☆  Pins at inhibit terminal shall be hung in the air during no operation.
☆  When ordering this device,the detail electrical specification shall be based on relevant standards. While data offered in this document shall be for reference only.


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