ISL6297 Datasheet, PDF (4/16 Pages) Intersil Corporation – Li-ion/Li Polymer Battery Charger

ISL6297
Pin Description
PIN # PIN NAME
DESCRIPTION
1, 15, 16 VIN VIN is the input power source. VIN can withstand up to 28V input.
2
GRN Open-drain LED drive pin. This pin sinks a constant-current 10mA to drive a green LED in a bi-color LED pack.
3
RED Open-drain LED drive pin. This pin sinks a constant-current 10mA to drive a red LED in a bi-color LED pack.
4
TIME Timer Programming Input. The TIME pin determines the oscillation period by connecting a timing capacitor between this
pin and GND. The oscillator provides a time reference for the charger.
5
GND GND is the connection to system ground.
6
DT
Delta Temperature Setting Input. This pin sets the temperature difference before and after the charging starts. This pin can
also be used as an indication whether or not the charger is charging.
7
EN Enable Input. Connect EN LOW to enable the charger. Pull it HIGH or leave it floating to disable the charger. This pin is
pulled up to 2.9V when left floating.
8
V2P9 Untrimmed 2.9V voltage output. This pin outputs a 2.9V voltage source when the input voltage is above POR threshold,
independent on the EN pin input. The V2P9 output is used to power the LEDs, the NTC circuit, or for other functions. The
maximum output current is 30mA. This output can also be used as an indication for adapter presence.
9
IREF This is the programming input for the constant charging current in a linear charger. In the typical application of a dual-mode
charger, the IREF pin programs the trickle charge current as well as the protection current level.
10
IMIN IMIN is the programmable input for the end-of-charge current.
11
TEMP Temperature setting input. An external NTC thermistor is connected to this pin for ambient temperature sensing.
12
VSEN Battery remote voltage sensing feedback pin. This pin allows remote sense of the battery pack voltage. Connect this pin
as close as possible to the battery positive terminal with a separate trace to minimize the impact of parasitic resistance.
This pin also serves the function of compensating for voltage drop caused by the connector contact resistance.
13, 14
BAT BAT is the charger output.
-
EPAD Exposed Pad. This pad is internally connected to GND. Connect as much copper as possible to this pad on the component
or other layers through thermal vias to maximize the thermal performance.
Typical Application
Input
C₁
C₂
D₂
R₁
R_T
D₁
R_S
R₂
VIN
V2P9
TEMP
DT
RED
GRN
GND
BAT
VSEN
EN
To Battery
C₃
R₃
C₄
BAT+
BAT-
ID
TIME
IREF
IMIN
C_TIME
R_IREF
R_IMIN
NOTE: Temperature limit
components selected for a
temperature Range of -5°C
to 45°C (not charging)
See Example, page 14
C₁: 1µF X5R ceramic capacitor
C₃: 10µF X5R ceramic capacitor
C₂, C₄: 0.1µF X5R ceramic capacitor
C_TIME : 22nF X5R or better timing capacitor
D₁, D₂: dual-color (red and green) LED in one package
R_IREF : 80kΩ, 1%
R_IMIN : 133kΩ, 1%
R₁: 15kΩ, 1%
R₂: TBD, value dependent on the ∆T (1.37kΩ for 10°C delta)
R_T: MuRata NCP18XH103J -- 10kΩ at 25°C, 5% (0603 size)
R_S: 41.2Ω
R₃: 10kΩ, 5% (R₃ and C₄ are for improving ESD protection)
4
FN9215.0
September 27, 2005