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LTC4012 Datasheet(PDF) 4 Page - Analog Devices

Part # LTC4012
Description  35V/3.2A Lead-Acid Step-Down Battery Charger with PowerPath and I2C Telemetry
PDF  48 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LTC4012 Datasheet(HTML) 4 Page - Analog Devices

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4
LTC4162-S
Rev B
For more information www.analog.com
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
System Voltages and Currents
VIN
Input Supply Voltage
l
4.5
35
V
VBAT
Battery Voltage
l
2.7
35
V
IBATSENS+
Battery Drain Current
VIN – VBATSENS+ > VIN_DUVLO, Terminated
VIN – VBATSENS+ < VIN_DUVLO
VIN = 0, SHIPMODE Activated
0.5
54
2.8
1
100
5
µA
µA
µA
IVIN
VIN Drain Current
VIN – VBATSENS+ > VIN_DUVLO, Terminated
115
200
µA
Switching Battery Charger
VCHARGE
Range
Resolution (6 Bits)
Accuracy
Per 6V Battery
l
–0.5
–1.5
6–7.8
28.571
0.5
1.5
V
mV
%
%
ICHARGE
Servo Voltage
(VCSP – VCSN)
Range
Resolution (5 Bits)
Accuracy
ICHARGE = (VCSP – VCSN)/RSNSB
Note 5
l
–0.25
–0.75
1–32
1
0.25
0.75
mV
mV
mV
mV
IINLIM
Servo Voltage
(VCLP – VCLN)
Range
Resolution (6 Bits)
Accuracy
IIN = (VCLP – VCLN)/RSNSI
Note 6
–0.2
0.5–32
0.5
0.2
mV
mV
mV
VINLIM
Range
Resolution (8 Bits)
Full Scale Accuracy
–1
0.14–36
140.625
1
V
mV
%
fOSC
Switching Frequency
RT = 63.4k
l
1.4
1.5
1.6
MHz
DMAX
Maximum Duty Cycle
99.5
%
RSWITCH
Primary Switch On-Resistance
90
mΩ
RRECT
Rectifier Switch On-Resistance
90
mΩ
IPEAK
Peak Inductor Current Limit
Note 3
45mV/RSNSB
A
System Controls
VIN_UVLO
VIN Charger Enable
Input Undervoltage Lockout
Rising Threshold
Hysteresis
4.2
4.4
0.2
4.6
V
V
VIN_DUVLO
VIN to BATSENS+ Charger Enable
Differential Undervoltage Lockout
Rising Threshold
Hysteresis
100
150
170
200
mV
mV
VIN_OVLO
VIN Charger Disable
Overvoltage Lockout
Rising Threshold
Hysteresis
37.6
38.6
1.4
40
V
V
VINTVCC_UVLO
INTVCC Telemetry Enable
Undervoltage Lockout
Rising Threshold
Hysteresis
2.75
2.85
0.12
2.95
V
V
The l denotes the specifications which apply over the full specified
operating junction temperature range, otherwise specifications are at TA = 25°C (Note 4). VIN = 18V, DVCC = 3.3V, RSNSI = 10mΩ,
RSNSB = 10mΩ unless otherwise noted.



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