BQ25570_14 Datasheet, PDF (15/41 Pages) Texas Instruments – Ultra Low Power Harvester Power Management IC with Boost Charger, and Nano-Powered Buck Converter

bq25570
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SLUSBH2C – MARCH 2013 – REVISED JANUARY 2014
TYPICAL CHARACTERISTICS
Table of Graphs
Unless otherwise noted, graphs were taken using Figure 2 with CIN = 4.7µF, L1 = Coilcraft 22µH LPS4018,
CSTOR = 4.7µF, L2 = Toko 10 µH DFE252012C, COUT = 22µF, VBAT_OV=4.2V, VOUT=1.8V
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
VSTOR Quiescent Current
vs. VSTOR Voltage
EN = 1, VOUT_EN = X (Ship Mode)
EN = 0, VOUT_EN = 0 (Standby Mode)
VBAT Quiescent Current
vs. VBAT Voltage
EN = 0, VOUT_EN = 1 (Active Mode)
Buck Efficiency (η)
vs. Output Current
vs. Input Voltage
vs. Output Current
Normalized Buck Output Voltage
vs. Input Voltage
vs. Temperature
Buck Maximum Output Current
vs. Input Voltage
VOUT = 1.8V - 100mV
Buck Major Switching Frequency
vs. Output Current
vs. Input Voltage
Buck Output Ripple
vs.Output Current
vs. Input Voltage
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 = ROUT = open
100Ω
Startup by taking EN low (from
ship mode), including VOUT
VBAT = 3.4-V charged Li coin cell; VIN_DC
= 1.0 V power supply; MPPT=50%; ZIN = ROUT = 90 Ω
100Ω
Startup by taking VOUT_EN high
(from Standby mode)
VBAT = 3.2-V charged Li coin cell; VIN_DC
= 2.0 V power supply; MPPT=50%; ZIN =
100Ω
ROUT = 90 Ω
MPPT Operation
VBAT = 3.2-V charged Li coin cell; VIN_DC VOC_SAMP = VSTOR to GND to
= 2.0 V power supply; ZIN = 100Ω
VSTOR
VBAT = 3.9-V charged 0.5F super cap;
100mA Load Transient on VOUT VIN_DC = 2.0 V power supply;
MPPT=50%; ZIN=100Ω
ROUT = open to 18 Ω to open
50mA Load Transient on VOUT
ROUT = open to 36 Ω to open
Charger Operational Waveform
during 50mA Load Transient
Buck Operational Waveform
during 50mA Load Transient
VBAT = 3.2-V charged Li coin cell; VIN_DC
= 2.0 V power supply; MPPT=50%; ZIN =
100Ω
ROUT = 36 Ω
VRDIV Waveform
VRDIV Waveform - Zoom
VSTOR = 4.2V; VOUT = 1.8V
VBAT_OK Operation
VSTOR ramped from 0 V to 4.2 V to 0 V
Charging a Super Cap on VBAT _{VIN_DC = sourcemeter with compliance =} VBAT = 120 mF super capacitor
Charging a Super Cap on VOUT ^{1.2 V and ISC = 1.0 mA}
VOUT = 120 mF super capacitor
FIGURE
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Figure 39
(1) See SLUA691 for an explanation on how to take these measurements. Because the MPPT feature cannot be disabled on the bq25570,
these measurements need to be taken in the middle of the 16 s sampling period.
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