Datasheet

LT3650-8.2/LT3650-8.4
3
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SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
LT3650
V
IN
V
IN
Operating Range
V
IN
Start Voltage
(Note 3)
l
l
9 32
11.5
V
V
V
IN(OVLO)
OVLO Threshold
OVLO Hysteresis
V
IN
Rising
l
32 35
1
40 V
V
V
IN(UVLO)
UVLO Threshold
UVLO Hysteresis
V
IN
Rising 8.7
0.2
V
V
V
BAT(F LT )
Battery Float Voltage LT3650-8.2
l
8.16
8.12
8.2 8.24
8.28
V
V
LT3650-8.4
l
8.36
8.32
8.4 8.44
8.48
V
V
∆V
RECHRG
Recharge Battery Threshold Threshold Voltage Relative to V
BAT(F LT )
–200 mV
V
BAT(PRE)
Battery Precondition Threshold Voltage LTC3650-8.2
LTC3650-8.4
5.65
5.80
V
V
V
BAT(PREHYST)
Battery Precondition Threshold
Hysteresis
90 mV
I
VIN
Operating Input Supply Current CC/CV Mode, Switch-On, I
SW
= 0
Standby Mode
Shutdown (SHDN = 0)
l
2.5
85
15
3.5 mA
µA
µA
I
BOOST
BOOST Supply Current Switch-On, I
SW
= 0
2.5V < V
(BOOST – SW)
< 8.5V 20 mA
I
BOOST
/I
SW
BOOST Switch Drive I
SW
= 2A 30 mA/A
V
SW(ON)
Switch-On Voltage Drop V
IN
– V
SW
, I
SW
= 2A 350 mV
I
SW(MAX)
Switch Current Limit
l
2.5 A
V
SENSE(PRE)
Precondition Current Sense Voltage V
SENSE
– V
BAT
V
BAT
= 5
15 mV
V
CLP(DC)
CLP Threshold Voltage V
CLP
– V
IN
; V
SENSE
– V
BAT
= 50mV
l
37.5 50 62.5 mV
I
CLP
CLP Input Bias Current 200 nA
V
SENSE(DC)
Maximum Current Sense Voltage V
SENSE
– V
BAT
; V
BAT
= 7.5V, V
RNG/SS
= 1.2V
l
95 100 105 mV
V
SENSE(C/10)
C/10 Trigger Sense Voltage
l
7.5 10 12.5 mV
I
BAT
BAT Input Bias Current Charging Terminated
l
0.1 1 µA
I
SENSE
SENSE Input Bias Current Charging Terminated
l
0.1 1 µA
V
NTC(H)
NTC Range Limit (High) V
NTC
Rising
l
1.25 1.36 1.45 V
V
NTC(L)
NTC Range Limit (Low) V
NTC
Falling
l
0.27 0.29 0.315 V
V
NTC(HYST)
NTC Threshold Hysteresis % of Threshold 20 %
R
NTC(DIS)
NTC Disable Impedance Minimum External Impedance to GND
l
250 500 kΩ
I
NTC
NTC Bias Current V
NTC
= 0.8V
l
47.5 50 52.5 µA
I
RNG/SS
I
RNG/SS
Bias Current
l
45 50 55 µA
V
RNG/SS
/V
SENSE
Current Limit Programming:
V
RNG/SS
/V
SENSE(MAX)
V
RNG/SS
= 0.5
l
8.5 10 11.5 V/V
V
SHDN
Shutdown Threshold Rising
l
1.17 1.20 1.23 V
V
SHDN(HYST)
Shutdown Hysteresis 120 mV
I
SHDN
SHDN Input Bias Current –10 nA
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at V
IN
= 20V, BOOST-SW = 4V, SHDN = 2V, SENSE = BAT = V
BAT(F LT )
, C
TIMER
= 0.68µF.