Datasheet

CHG Mode: VBUS = 5 V VBAT = 3.7 V

Vsw

Vsys_AC coupled

Vprnid_AC coupled

Test Summary

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2.3.2.3 Increase the Constant Voltage Load to 3.7 V

Measure → V(J2(SYS), J2(GND)) = 3.75 V ±200 mV

Measure → IBAT = 500 mA ±200 mA

Measure → V(J2(BAT), J2(GND)) = 3.7 V ±200 mV

2.3.2.4 In the software, set Fast Charge Current, ICHG to 1.012 A

Measure → Iin = 500 mA ± 200 mA

2.3.2.5 Verify Scope Measurements (See Figure 4 – 500 ns/div)

C1 (AC coupled 20 mV/div): Vac_PMID (TP20 to GND) – Ripple excluding high frequency spikes < 10 mV

C2 (5 V/div): Vdc_SW (TP2) - Frequency between 1.25 MHz and 1.5 MHz, duty cycle between 73% and

81%

C3 (AC coupled 20 mV/div): Vac_VSYS (TP3 to GND) - excluding high frequency spikes < 15 mV

Figure 4. CHG Mode Ripple and Duty Cycle: V

BUS

= 5 V, V

BAT

= 3.7 V

bq24190/2/2i/3/6 and bq24292i EVM (PWR021) User's Guide SLUUA14C–October 2012–Revised August 2013

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