LTC4020_15 Datasheet, PDF (4/42 Pages) Linear Technology – 55V Buck-Boost Multi-Chemistry Battery Charger

LTC4020
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T_A = 25°C (Note 2). PV_IN = SENSVIN = CSP = CSN = BAT = 20V, SHDN = 2V,
C_{(TG1, BG1, TG2, BG2)} = 1000pF, V_RNG/SS = 2V.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Battery Charger
V_BAT
Charger Output Voltage Range
V_FB
Float Reference
Auto Recharge Voltage
Precondition Threshold (Rising)
Precondition Hysteresis
Absorption Reference
Float Reference
Bulk Charge Threshold (Falling)
Precondition Threshold (Rising)
Precondition Hysteresis
Voltage Reference
CC/CV Charging (MODE = 0V)
% of Float Reference
% of Float Reference
Lead-Acid Charging (MODE = INTV_CC)
% of Absorption Reference
% of Absorption Reference
% of Absorption Reference
CC Charging (MODE = - NC -)
l
55
V
2.4875 2.5 2.5125
V
l 2.475
2.525
V
l 96.5 97.5 98.5
%
l 68
70
72
%
85
mV
2.4875 2.5 2.5125
V
l 2.475
2.525
V
l 91.5 92.5 93.5
%
l 86
87.5
89
%
l 68
70
72
%
85
mV
2.4875 2.5 2.5125
V
l 2.475
2.525
V
V_{IN_REG}
Input Regulation Reference
% of Float (CC/CV), Safety (CC), or
Absorption (LA) Reference
l 98
100
102
%
V_FBMIN
Instant-On Reference
% of Float (CC/CV) or Absorption (LA)
l 84
85
86
%
Reference
C/10 Detection Enable (Rising)
Hysteresis (Falling)
2.175
V
20
mV
Instant-On Charge Current Reduction
Threshold
V_CSN – V_BAT; Note 4
0.45
V
C/10 Detection Enable
C/10 Detection Hysteresis
V_CSN – V_BAT Falling
V_CSN – V_BAT Rising
Charge Current Reduction Gain
ΔV_CS(MAX)/Δ(V_CSN – V_BAT);Note 4
I_BATQ
Battery Bias Currents with PowerPath
I_CSP + I_CSN + I_BAT
l
Switcher Disabled
1.05
150
–33
9
18
V
mV
mV/V
µA
CSN, CSP Charger Current Sense Pin Operating Bias
Currents
I_CSP = I_CSN; Charging Enabled
40
µA
Charger Current Sense Limit Voltage
Charger Current Sense Termination Voltage
(C/10)
V_CSP – V_CSN
V_CSP – V_CSN; MODE = 0V
l 47.5
50
52.5
mV
l
3
5
7
mV
CSOUT
RNG/SS
NTC
I_NTC
Charger Current Sense Precondition Voltage
Sense Input UVLO
UVLO Hysteresis
Offset
Gain
Current Limit Programming
NTC Range Limit (High)
NTC Range Limit (Low)
NTC Range Hysteresis
NTC Pin Bias Current
NTC Disable Current
V_CSP – V_CSN; V_FB = 1.5
V_CSP Rising (Charging Enabled)
V_CSP Falling (Charging Disabled)
V_CSP = V_CSN
ΔV_CSOUT / Δ(V_CSP – V_CSN)
V_RNG/SS = 0.5V; V_RNG/SS/V_CS(MAX)
V_NTC Rising
V_NTC Falling
% of V_NTC(H,L)
V_NTC = 0.8V
INTC Pin Current (Falling)
l 1.5
3
4.5
mV
l 1.6
1.75
1.9
V
100
mV
l 0.225 0.25 0.290
V
l 19
20
21
V/V
l 18
20
22
V/V
l 1.30 1.35 1.40
V
l 0.27
0.3
0.33
V
20
%
l 47.5
50
52.5
µA
3.5
µA
NTC Disable Current Hysteresis
2
µA
V_BGATE
Gate Clamp Voltage
C/10 Detection Enable (Falling)
C/10 Detection Enable Hysteresis
V_CSN – V_BGATE
V_CSN < 7V
l
7
9.5
12
V
0.425
V
0.125
V
4020fb
4
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