Datasheet

3
4012fa
LTC4012/
LTC4012-1/LTC4012-2
electrical characteristics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. DCIN = 20V, BAT = 12V, GND = 0V unless otherwise noted. (Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Charge Voltage Regulation
V
TOL
V
BAT
Accuracy (See Test Circuits) LTC4012
C-Grade
I-Grade
l
l
–0.5
–0.8
–1.0
0.5
0.8
1.0
%
%
%
LTC4012-1/LTC4012-2
C-Grade
FVS1 = 0V, FVS0 = 0V, I-Grade
FVS1 = 0V, FVS1 = 5V, I-Grade
FVS1 = 5V, FVS0 = 0V, I-Grade
FVS1 = 5V, FVS1 = 5V, I-Grade
l
l
l
l
l
–0.6
–0.8
–1.1
–1.15
–1.25
–1.35
0.6
0.8
1.1
1.15
1.25
1.35
%
%
%
%
%
%
I
VFB
V
FB
Input Bias Current V
FB
= 1.2V ±20 nA
R
ON
FBDIV On Resistance I
LOAD
= 100µA
l
85 190
Ω
I
LEAK-FBDIV
FBDIV Output Leakage Current SHDN = 0V, FBDIV = 0V
l
–1 0 1 µA
V
BOV
V
FB
Overvoltage Threshold LTC4012
l
1.235 1.281 1.32 V
BAT Overvoltage Threshold LTC4012-1/LTC4012-2, Relative to
Selected Output Voltage
l
103 106 109 %
Charge Current Regulation
I
TOL
Charge Current Accuracy with R
IN
= 3.01k,
6V < BAT < 18V (LTC4012)
6V < BAT < 15V (LTC4012-1, LTC4012-2)
R
PROG
= 26.7k
C-Grade
I-Grade
l
l
–4
–5
–9.5
4
5
9.5
%
%
%
V
SENSE
= 0mV, PROG = 1.2V –12.75 –11.67 –10.95 µA
A
I
Current Sense Amplifier Gain (PROG ∆I) with
R
IN
= 3.01k, 6V < BAT < 18V (LTC4012)
6V < BAT < 15V (LTC4012-1, LTC4012-2)
V
SENSE
Step from 0mV to 5mV,
PROG = 1.2V
–1.78 –1.66 –1.54 µA
V
CS-MAX
Maximum Peak Current Sense Threshold Voltage
per Cycle (R
IN
= 3.01k)
ITH = 2V, C-Grade
ITH = 2V, I-Grade
ITH = 5V
l
l
l
140
125
195
325
250
265
430
mV
mV
mV
V
C10
C/10 Indicator Threshold Voltage PROG Falling 340 400 460 mV
V
REV
Reverse Current Threshold Voltage PROG Falling 180 253 295 mV
Input Current Regulation
V
CL
Current Limit Threshold CLP – CLN
C-Grade
I-Grade
l
l
97
96
92
100
100
103
104
108
mV
mV
mV
I
CLN
CLN Input Bias Current CLN = CLP ±100 nA
V
ICL
ICL Indicator Threshold (CLP – CLN) – V
CL
–8 –5 –2 mV
CLP Supply
OVR Operating Voltage Range 6 28 V
V
UVLO
CLP Undervoltage Lockout Threshold CLP Increasing
l
4.65 4.85 5.25 V
V
UV(HYST)
UVLO Threshold Hysteresis 200 mV
I
CLPO
CLP Operating Current CLP = 20V, No Gate Loads 2 3 mA
Shutdown
V
ACP
AC Present Threshold Voltage DCIN – BAT, DCIN Rising
C-Grade
I-Grade
l
l
350
300
500 650
700
mV
mV
V
ACP(HYST)
ACP Threshold Hysteresis Voltage 200 mV
V
IL
SHDN Input Voltage Low
l
300 mV
V
IH
SHDN Input Voltage High
l
1.4 V