Datasheet

Vphase
Vstor
Vp/s#1
Vin
Vphase
Vp/s#1
Vin
Vstor
www.ti.com Test Summary
Figure 3. Startup with Battery Less Than UV
3.3.3 Power-up with Battery more than UV (2.3V to 3V), BAT FET ON
1. Same setup as 3.3.1, except change the charge element set to 2.4VDC between BAT and GND. Set
scope to 2sec/div and to roll.
2. Set PS#1 to 1VDC and hot plug to input with 10Ω series resistor, see Figure 4.
Note in Figure 4 that the BAT FET is on and the STOR output is powered prior to the input being applied.
This means the converter will start up in normal boost mode and after doing its initial sampling will
regulate V
IN
to the MPPT threshold.
Figure 4. Powering up with a Battery above UV
7
SLUU654A–October 2011–Revised October 2011 bq25504 EVM – Ultra Low Power Boost Converter with Battery Management for
Energy Harvester Applications
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