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TPS63900EVM: Higher Quiescent Current

Part Number: TPS63900EVM

HI, 

I did some testing on TPS63900EVM. Following are the instruments that I used. 

1. Keithley 6 1/2 Digit multimeter (DMM6500)

2. Keithley 2231A-30-3 DC power supply

Setting: S1.1 ON, S2.1, ON, S6.4 ON

I tested board with and without load on 101.4 ohm resistive load. Below are the test results. I am getting higher quiscent current. Please check and let me know what is the reason. 

 

Input

3.3V

Input Voltage

1.8V

Input Voltage

2.5V

Input Voltage

3V

Input Voltage

3.3V

Input Voltage

3.6V

 

Resistive  Load

Output Voltage

3.3V

Output Voltage

3.3V

Output Voltage

3.3V

Output Voltage

3.3V

Output Voltage

3.3V

 

101.4 Ohm

Without Load

With Load

Without Load

With Load

Without Load

With Load

Without Load

With Load

Without Load

With Load

Peak to Peak

216.018

uA

252

uA

553

uA

285.658

uA

213.77

uA

312.697

uA

200.867

uA

323.852

uA

464.815

uA

380.262

uA

373.16

uA

Average Current

32.3407

mA

11.13

uA

66.45

mA

12.126

uA

46.5328

mA

11.92

uA

37.92

mA

12.5867

uA

33.528

mA

11.913

uA

30.6167

mA

Standard Deviation

49.4438

uA

49.731

uA

107.084

uA

49.748

uA

51.018

uA

49.62

uA

50.3

uA

49.656

uA

4.043

mA

50.2019

uA

62.068

uA

Maximum

0.03245

A

0.00018

A

0.06674

A

0.0002

A

0.04664

A

0.00023

A

0.03805

A

0.00028

A

0.04987

A

0.0003

A

0.03081

A

Minimum

0.03223

A

-0.00009

A

0.06619

A

-0.00008

A

0.04643

A

-0.00008

A

0.03783

A

-0.00008

A

-0.0009

A

-0.00008

A

0.0304

A