ISL9301_14 Datasheet, PDF (5/12 Pages) Intersil Corporation – High Input Voltage Charger With Power Path Management

ISL9301
IREF - Charge-current program and monitoring pin. Connect
a resistor between this pin and the GND pin to set the
charge current limit determined by Equation 4:
I_REF
=
---³---⁸---⁸----⁶----
R_IREF
(mA)
(EQ. 4)
Where R_IREF is in kΩ. The IREF pin voltage also monitors
the actual charge current during the entire charge cycle,
including the trickle, constant-current, and constant-voltage
phases. When disabled, V_IREF = 0V.
BATON - Battery disconnect pin. The BATON pin is a logic
input pin to allow the disconnection of the battery from the
system to eliminate the unwanted drainage current from the
battery. There is an internal 1MΩ pull-down resistor at this
pin. Drive to HIGH to connect the battery to the system.
When this pin is driven to LOW or left floating, the battery is
disconnected from the system.
VOUT - Output connection to the system. This pin provides
a 4.5V regulated voltage for the system when a valid input
power is present. If no valid input is present, and BATON is
driven HI, the VOUT pin is connected to VBAT through an
internal MOSFET. If no valid input is present and BATON is
LOW, the voltage at VOUT pin is zero. A 4.7µF or larger X5R
ceramic capacitor is recommended for decoupling and
stability purposes.
EPAD - Exposed pad. Connect as much copper as possible
to this pad either on the component layer or other layers
through thermal vias to enhance the thermal performance.
TRICKLE
4.2V
IREF
2.8V
16%IREF
CC
TIMEOUT
CV
CHARGE
VOLTAGE
CHARGE
CURRENT
IMIN
VREC
CHG
CHG
INDICATION
TIME
FIGURE 1. TYPICAL CHARGING CYCLE
5
FN6435.3
September 21, 2011