Datasheet

LTC4010
9
4010fb
block DiagraM
5
6
11
CHARGER
STATE
CONTROL
LOGIC
THERMISTOR
INTERFACE
A/D
CONVERTER
BATTERY
DETECTOR
VOLTAGE
REGULATOR
UVLO AND
SHUTDOWN
PWM
CHARGE
TIMER
VOLTAGE
REFERENCE
INTERNAL
VOLTAGE
REGULATOR
V
TEMP
4
CHEM
2
CHRG
1
FAULT
9
10
13
12
14
3
GND
V
CELL
8
TIMER
7
V
CDIV
INTV
DD
4010 BD
BAT
SENSE
BGATE
16
READY
V
CC
PGND
TGATE
15
operaTion
(Refer to Figure 1)
CHARGE
QUALIFICATION
SHUTDOWN
DC ADAPTER PRESENT
NiCd OR
NiMH – ∆V
V
CELL
< 1.325V
*t
MAX
IS PROGRAMMED MAXIMUM FAST CHARGE DURATION
**OPTIONAL TEMPERATURE LIMITS APPLY
4010 F01
V
CELL
< 900mV
V
CELL
> 900mV
V
CELL
> 900mV
V
CELL
< 900mV
V
CELL
< 1.22V AT t
MAX
*/12
OR TIME = t
MAX
V
CELL
> 350mV, ADEQUATE V
CC
,
CHARGER ENABLED AND
TEMPERATURE OK (OPTIONAL)
CHECK
BATTERY
PRECHARGE**
(C/5 FOR
t
MAX
/12)
FAST CHARGE**
(1C)
AUTOMATIC
RECHARGE
FAULT
V
CELL
> 1.95V
OR PWM FAULTS
TOP-OFF
CHARGE**
(C/10)
NiMH
∆T/∆t
NO DC ADAPTER
t
MAX
/3
NO BATTERY
OR
V
CC
< 4.25V
Figure 1. LTC4010 State Diagram