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ADP2291

HKV
on Jan 21, 2017

Designed for Imax @ 750mA based on Datasheet (Figure 23 exact, except D1 is 1N5819 instead of BAT1000)

Rs = 200mOHM

Radj = open

Measurements

Vin = 5.9V (Voltage Drop across D1 is 0.301V)

Vrs = 15mV

Vadj = 2.975V

Vchg = 0.001V

Disconnected Battery Voltage = 0.688V (4.2V Li Ion battery pack containing 3 batteries)

Output Voltage, Vbat = 0.694 V !! instead of expected 5 V
Charge Current Starts at 2 mA and reduces to 0.12 mA !!

Part FZT549 used as external pass transistor is found to heat up also. 

The circuit is supposed to produce an output of 5V and charge the connected battery. But as i have explained above, it is not. Kindly advise. How do i troubleshoot this ? 

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    •  Analog Employees 
    on Aug 2, 2018 3:42 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

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    EZ Admin
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    •  Analog Employees 
    on Aug 2, 2018 3:42 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    EZ Admin
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