Lineage Power

8

Data Sheet

March 28, 2008

3.0 Vdc - 5.5 Vdc Input, 0.9 Vdc - 3.3 Vdc Output, 10 A

Test Configurations

Note: Measure input reflected ripple current with a simulated source

tery impedance. Measure current as shown above.

Figure 15. Input Reflected Ripple Current Test Setup.

Note: Scope measurements should be made using a BNC socket,

with a 10 µF tantalum capacitor and a 1 µF ceramic capcitor.

Position the load between 51 mm and 76 mm (2 in and 3 in)

from the module

Figure 16. Peak-to-Peak Output Ripple Measurement

Test Setup.

Note: All voltage measurements to be taken at the module termi-

nals, as shown above. If sockets are used then Kelvin con-

nections are required at the module terminals to avoid

measurement

errors due to socket contact resistance.

Figure 17. Output Voltage and Efficiency Test Setup.

Design Considerations

Input Source Impedance

To maintain low-noise and ripple at the input voltage, it is

critical to use low ESR capacitors at the input to the module.

18 shows the input ripple voltage (mVp-p) for various output

models using a 150 µF low ESR polymer capacitor (Pana-

sonic p/n: EEFUE0J151R, Sanyo p/n: 6TPE150M) in parallel

with 47 µF ceramic capacitor (Panasonic p/n: ECJ-

5YB0J476M,

Taiyo Yuden p/n: CEJMK432BJ476MMT). 19 depicts much

lower input voltage ripple when input capacitance is

increased to 450 µF (3 x 150 µF) polymer capacitors in par-

allel with 94 µF (2 x 47 µF) ceramic capacitor.

The input capacitance should be able to handle an AC ripple

current of at least:

Figure 18. Input Voltage Ripple for Various

Output Models, IO = 10 A

(CIN = 150 µF polymer // 47 µF ceramic).

Figure 19. Input Voltage Ripple for Various

Output Models, IO = 10 A (CIN = 3x150 µF

polymer // 2x47 µF ceramic).

BATTERY

L

1 µH

μF

ESR < 0.1

Ω

@ 20

°C, 100 kHz

2 x 100µF

Tantalum

GND

RESISTIVE

LOAD

SCOPE

10 µF

COPPER STRIP

TANTALUM

1µF

CERAMIC

SUPPLY

CONTACT RESISTANCE

CONTACT AND

DISTRIBUTION LOSSES

LOAD

GND

η

V

O(+)

V

O(-)

–

[] I

O

×

V

I(+)

V

I(-)

–

[] I

I

×

------------------------------------------------

⎝⎠

⎛⎞

100

×

=

I

rms

I

out

V

out

V

in

----------- 1

V

out

V

in

-----------

–

=

A

rms

0

50

100

150

200

0.5

1

1.5

2

2.5

3

0

25

50

75

100

0.5

1

1.5

2

2.5

3