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LTC4020 Datasheet(PDF) 4 Page - Linear Technology

Part # LTC4020
Description  55V Buck-Boost Multi-Chemistry Battery Charger
Download  42 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4020 Datasheet(HTML) 4 Page - Linear Technology

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LTC4020
4
4020fb
For more information www.linear.com/LTC4020
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Battery Charger
VBAT
Charger Output Voltage Range
l
55
V
VFB
Float Reference
Auto Recharge Voltage
Precondition Threshold (Rising)
Precondition Hysteresis
CC/CV Charging (MODE = 0V)
% of Float Reference
% of Float Reference
l
l
l
2.4875
2.475
96.5
68
2.5
97.5
70
85
2.5125
2.525
98.5
72
V
V
%
%
mV
Absorption Reference
Float Reference
Bulk Charge Threshold (Falling)
Precondition Threshold (Rising)
Precondition Hysteresis
Lead-Acid Charging (MODE = INTVCC)
% of Absorption Reference
% of Absorption Reference
% of Absorption Reference
l
l
l
l
2.4875
2.475
91.5
86
68
2.5
92.5
87.5
70
85
2.5125
2.525
93.5
89
72
V
V
%
%
%
mV
Voltage Reference
CC Charging (MODE = - NC -)
l
2.4875
2.475
2.5
2.5125
2.525
V
V
VIN_REG
Input Regulation Reference
% of Float (CC/CV), Safety (CC), or
Absorption (LA) Reference
l
98
100
102
%
VFBMIN
Instant-On Reference
% of Float (CC/CV) or Absorption (LA)
Reference
l
84
85
86
%
C/10 Detection Enable (Rising)
Hysteresis (Falling)
2.175
20
V
mV
Instant-On Charge Current Reduction
Threshold
VCSN – VBAT; Note 4
0.45
V
C/10 Detection Enable
C/10 Detection Hysteresis
VCSN – VBAT Falling
VCSN – VBAT Rising
1.05
150
V
mV
Charge Current Reduction Gain
ΔVCS(MAX)/Δ(VCSN – VBAT);Note 4
–33
mV/V
IBATQ
Battery Bias Currents with PowerPath
Switcher Disabled
ICSP + ICSN + IBAT
l
9
18
µA
CSN, CSP
Charger Current Sense Pin Operating Bias
Currents
ICSP = ICSN; Charging Enabled
40
µA
Charger Current Sense Limit Voltage
VCSP – VCSN
l
47.5
50
52.5
mV
Charger Current Sense Termination Voltage
(C/10)
VCSP – VCSN; MODE = 0V
l
3
5
7
mV
Charger Current Sense Precondition Voltage
VCSP – VCSN; VFB = 1.5
l
1.5
3
4.5
mV
Sense Input UVLO
UVLO Hysteresis
VCSP Rising (Charging Enabled)
VCSP Falling (Charging Disabled)
l
1.6
1.75
100
1.9
V
mV
CSOUT
Offset
VCSP = VCSN
l
0.225
0.25
0.290
V
Gain
ΔVCSOUT / Δ(VCSP – VCSN)
l
19
20
21
V/V
RNG/SS
Current Limit Programming
VRNG/SS = 0.5V; VRNG/SS/VCS(MAX)
l
18
20
22
V/V
NTC
NTC Range Limit (High)
NTC Range Limit (Low)
NTC Range Hysteresis
VNTC Rising
VNTC Falling
% of VNTC(H,L)
l
l
1.30
0.27
1.35
0.3
20
1.40
0.33
V
V
%
INTC
NTC Pin Bias Current
VNTC = 0.8V
l
47.5
50
52.5
µA
NTC Disable Current
INTC Pin Current (Falling)
3.5
µA
NTC Disable Current Hysteresis
2
µA
VBGATE
Gate Clamp Voltage
VCSN – VBGATE
l
7
9.5
12
V
C/10 Detection Enable (Falling)
C/10 Detection Enable Hysteresis
VCSN < 7V
0.425
0.125
V
V
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 2). PVIN = SENSVIN = CSP = CSN = BAT = 20V, SHDN = 2V,
C(TG1, BG1, TG2, BG2) = 1000pF, VRNG/SS = 2V.


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