Datasheet

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bq25504
VSS
VIN_DC
AVSS
VOC_SAMP
VREF_SAMP
OT_PROG VBAT_OV VRDIV VBAT_UV
LBST VSTOR VBAT VSS
OK_HYST
OK_PROG
VBAT_OK
bq25504
www.ti.com SLUSAH0A –OCTOBER 2011–REVISED SEPTEMBER 2012
DEVICE INFORMATION
RGT PACKAGE
(TOP VIEW)
Figure 1. bq25504 3mm x 3mm QFN-16 Package
PIN FUNCTIONS
PIN
I/O TYPE DESCRIPTION
NO. NAME
1 VSS Input General ground connection for the device
2 VIN_DC Input DC voltage input from energy harvesters
3 VOC_SAMP Input Sampling pin for MPPT network. To disable MPPT, connect to VSTOR
Switched node for holding the reference set by resistors on VOC_SAMP for MPPT. When MPPT is
4 VREF_SAMP Input disabled, VREF_SAMP should not be left floating but either either be tied to an external reference
voltage or tied to GND.
5 OT_PROG Input Digital Programming input for overtemperature threshold
6 VBAT_OV Input Resistor divider input for over voltage threshold
7 VRDIV Output Resistor divider biasing voltage.
8 VBAT_UV Input Resistor divider input for under voltage threshold
9 OK_HYST Input Resistor divider input for VBAT_OK hysteresis threshold
10 OK_PROG Input Resistor divider input for VBAT_OK threshold
11 VBAT_OK Output Digital battery good indicator referenced to VSTOR pin
12 AVSS Supply Signal ground connection for the device
13 VSS Supply General ground connection for the device
14 VBAT I/O Connection for storage elements
15 VSTOR Output Connection for the system load, output of the boost converter
16 LBST Input Inductor connection for the boost converter switching node
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