LTC4010 Datasheet, PDF (7/20 Pages) Linear Integrated Systems – High Efficiency Standalone Nickel Battery Charger

LTC4010
PI FU CTIO S
TGATE (Pin 14): External P-channel MOSFET Gate Control
Output. This output provides gate drive to an external
PMOS power transistor switch used in the DC/DC con-
verter. Operating voltage range varies as a function of V_CC.
Refer to the Electrical Characteristics table for specific
voltages.
V_CC (Pin 15): Power Input. External diodes normally con-
nect either the DC input power supply or the battery to this
pin. Refer to the Applications Information section for fur-
ther details. Suggested applied voltage range is GND to 34V.
READY (Pin 16): Active-Low Ready-to-Charge Output.
The LTC4010 connects this pin to GND if proper operating
voltages for charging are present. Refer to the Operation
section for complete details on charge qualification. This
output is capable of driving an LED and should be left
floating if not used. READY is an open-drain output to GND
with an operating voltage range of GND to V_CC.
Exposed Pad (Pin 17): This pin provides enhanced
thermal properties for the TSSOP. It must be soldered to
the PCB copper ground to obtain optimum thermal
performance.
BLOCK DIAGRA
FAULT
1
CHRG
2
4 GND
CHEM
3
V_TEMP
5
V_CELL
6
THERMISTOR
INTERFACE
A/D
CONVERTER
BATTERY
DETECTOR
TIMER
8
V_CDIV
7
CHARGE
TIMER
VOLTAGE
REFERENCE
CHARGER
STATE
CONTROL
LOGIC
UVLO AND
SHUTDOWN
PWM
READY
16
V_CC
15
TGATE
14
BGATE
13
PGND
12
SENSE
9
BAT
10
VOLTAGE
REGULATOR
INTV_DD
11
INTERNAL
VOLTAGE
REGULATOR
4010 BD
4010p
7