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BQ25504 View Datasheet(PDF) - Texas Instruments

Part NameDescriptionManufacturer
BQ25504 Ultra Low-Power Boost Converter With Battery Management for Energy Harvester Applications Texas-Instruments
Texas Instruments Texas-Instruments
BQ25504 Datasheet PDF : 36 Pages
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bq25504
SLUSAH0C – OCTOBER 2011 – REVISED JUNE 2015
6 Pin Configuration and Functions
www.ti.com
RGT Package
16 Pins
Top View
16
LBST
1 VSS
15 `
VSTOR
14
VBAT
13
VSS
AVSS 12
2 VIN_DC
VBAT_OK 11
bq25504
3 VOC_SAMP
OK_PROG 10
4 VREF_SAMP
OK_HYST 9
OT_PROG VBAT_OV VRDIV VBAT_UV
5
6
7
8
PIN
NAME
NO.
AVSS
12
LBST
16
OK_HYST
9
OK_PROG
10
OT_PROG
5
VBAT
14
VBAT_OK
11
VBAT_OV
6
VBAT_UV
8
VIN_DC
2
VOC_SAMP
3
VRDIV
7
VREF_SAMP
4
VSS
1
VSS
13
VSTOR
15
Pin Functions
I/O
DESCRIPTION
Supply
Input
Input
Input
Input
I/O
Output
Input
Input
Input
Input
Output
Input
Input
Supply
Output
Signal ground connection for the device
Inductor connection for the boost charger switching node. Connect a 22 µH inductor between this
pin and pin 2 (VIN_DC).
Connect to the mid-point of external resistor divider between VRDIV and GND for setting the
VBAT_OK hysteresis threshold. If not used, connect this pin to GND.
Connect to the mid-point of external resistor divider between VRDIV and GND for setting the
VBAT_OK threshold. If not used, connect this pin to GND.
Digital Programming input for IC overtemperature threshold. Connect to GND for 60 C threshold or
VSTOR for 120 C threshold.
Connect a rechargeable storage element with at least 100 uF of equivalent capacitance to this pin.
Digital output for battery good indicator. Internally referenced to the VSTOR voltage. Leave floating
if not used.
Connect to the mid-point of external resistor divider between VRDIV and GND for setting the
VSTOR = VBAT overvoltage threshold.
Connect to the mid-point of external resistor divider between VRDIV and GND for setting the VBAT
undervoltage threshold. The PFET between VBAT and VSTOR opens if the voltage on VSTOR is
below this threshold.
DC voltage input from energy harvesters. Connect at least a 4.7 µF capacitor as close as possible
between this pin and pin 1.
Sampling pin for MPPT network. Connect to the mid-point of external resistor divider between
VIN_DC and GND for setting the MPP threshold voltage which will be stored on the VREF_SAMP
pin. To disable the MPPT sampling circuit, connect to VSTOR.
Resistor divider biasing voltage.
Connect a 0.01 µF low leakage capacitor from this pin to GND to store the voltage to which VIN_DC
will be regulated. This voltage is provided by the MPPT sample circuit. When MPPT is disabled,
either use an external voltage source to provide this voltage or tie this pin to GND to disable input
voltage regulation (i.e. operate from a low impedance power supply).
General ground connection for the device
General ground connection for the device
Connection for the output of the boost charger, which is typically connected to the system load.
Connect at least a 4.7 µF capacitor in parallel with a 0.1 µF capacitor as close as possible to
between this pin and pin 1 (VSS).
4
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