Datasheet
ISET1
CHARGE
7
V
I =
20 R´
ISET2
PRECHARGE
7
V
I =
100 R´
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Introduction
Table 2. Control and Key Parameters Setting (continued)
Jack Description Factory Setting
JP5 Charger enable/disable setting. ISET is pulled to GND and the charger is Jumper OPEN (disable charger)
disabled when JP5 OPEN; charger is enable when JP5 ON.
1.5 Recommended Operating Conditions
Table 3. Recommended Operating Conditions
Symbol Description Min Typ Max Unit Notes
Supply voltage, V
BUS
Input voltage 5.5 17 V
Battery voltage, V
BAT
Voltage applied at VBAT terminal of J2 0 12.6 V
Supply current Maximum input current 0 4 A
Charge current, I
chrg
Battery charge current 0 2 4 A
Operating junction 0 125 °C
temperature range, T
J
The bq24130 EVM board requires a regulated supply approximately 1V minimum above the regulated
voltage of the battery pack to a maximum input voltage of 17 VDC. The bq24130 uses CELL pin to select
number of cells with a fixed 4.2V/cell. Connecting CELL to AGND gives 1 cell, floating CELL pin gives 2
cell configure, and connecting to VREF gives 3 cells configure. CELL pin adjusts internal resistor voltage
divider from BAT pin to AGND pin for voltage feedback and regulate to internal 2.1V voltage reference.
CELL Pin Voltage Regulation
AGND 4.2V
Floating 8.4V
VREF 12.6V
The default setting is 12.6V for BAT voltage.
A low-level signal on the CMOD pin forces the IC to charge at the pre-charge rate set on the ISET2 pin. A
high-level signal forces charge at fast-charge rate as set by the ISET1 pin. If the battery reaches the
voltage regulation level, the IC transitions to voltage regulation phase regardless of the status of the
CMOD input.
The ISET1 input sets the maximum charging current. Battery current is sensed by current sensing resistor
RSR connected between SRP and SRN. The full-scale differential voltage between SRP and SRN is
40mV max. The equation for charge current is:
(1)
The precharge current is determined by the voltage on the ISET2 pin according to the formula
(2)
The default setting is 2ADC for fast charge current and 0.2ADC for pre-charge current.
3
SLVU495B–July 2011–Revised January 2012 600-kHz Synchronous Switch-Mode Li-Ion and Li-Polymer Host-Controlled
Battery Charger With Integrated MOSFETs
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