BQ25505 Datasheet, PDF (12/34 Pages) Texas Instruments – Ultra Low Power Boost Charger with Battery Management and Autonomous Power

bq25505
SLUSBJ3B – AUGUST 2013 – REVISED JANUARY 2014
www.ti.com
TYPICAL CHARACTERISTICS
Table of Graphs
Unless otherwise noted, graphs were taken using with CIN = 4.7µF, L1 = Coilcraft 22µH LPS4018, CSTOR =
4.7µF, VBAT_OV=4.2V
IN= 10 µA
vs. Input Voltage
IN= 100 µA
Charger Efficiency (η)⁽¹⁾
IIN = 10 mA
VIN = 2.0 V
vs. Input Current
VIN = 1.0 V
VIN = 0.5 V
VIN = 0.2 V
VBAT_SEC Quiescent Current
vs. VBAT_SEC Voltage
EN = VBAT_SEC (Active
Mode)
EN = GND (Ship Mode)
VBAT_PRI Leakage Current
vs. VBAT_PRI Voltage
EN = VBAT_SEC (Ship
Mode)
Startup by Taking EN Low (from
Ship mode)
VBAT = 3.4-V charged Li coin cell; VIN_DC = 1.0 V
power supply; MPPT=50%; ZIN = 100Ω
MPPT Operation
VBAT = 3.2-V charged Li coin cell; VIN_DC = 2.0 V VOC_SAMP = VSTOR to
power supply; ZIN = 100Ω
GND to VSTOR
50mA Load Transient on VSTOR
50mA Load Transient on VSTOR
with Sampling
VBAT = 4.2V charged 0.5 F; VIN_DC = 1.5 V
power supply; MPPT=80%; ZIN = 75Ω
R(VSTOR) = open to 84
Ω to open
R(VSTOR) = open to 84
Ω to open
Charger Operational Waveform
During 50mA Load Transient
R(VSTOR) = 84 Ω
VRDIV Waveform over Two Periods
VSTOR = 4.2V
VRDIV Waveform
VBAT_OK Operation
VSTOR ramped from 0 V to 4.2 V to 0 V with
function generator
Multiplexor Output (VOR) as
VBAT_SEC Crosses VBAT_OK
Threshold
VSTOR ramped from 0 V to 4.2 V to 0 V with
function generator; VBAT_PRI = 3.6V power supply
VBAT_SEC = 0.5 F super
capacitor; 1kΩ load on
VOR
Multiplexor Signals When
VBAT_SEC > VBAT_OK Threshold
VB_PRI_ON goes high; VB_SEC_ON goes low
Multiplexor Signals When
VBAT_SEC < VBAT_OK Threshold
VB_PRI_ON goes low; VB_SEC_ON goes low
Charging a Super Cap on VBAT
VIN_DC = sourcemeter with compliance = 1.2 V
and ISC = 1.0 mA
VBAT_SEC = 120 mF
super capacitor
FIGURE
Figure 6
Figure 7
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Figure 25
Figure 26
Figure 27
(1) See SLUA691 for an explanation on how to take these measurements. Because the MPPT feature cannot be disabled on the bq25505,
these measurements need to be taken in the middle of the 16 s sampling period.
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