LTC4012/
LTC4012-1/LTC4012-2
4
4012fa
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
R
IN
SHDN Pull-Down Resistance 40
kΩ
I
CLPS
CLP Shutdown Current CLP = 12V, DCIN = 0V
SHDN = 0V
l
15
350
26
500
µA
µA
I
LEAK-BAT
BAT Leakage Current SHDN = 0V or DCIN = 0V,
0V ≤ CSP = CSN = BAT ≤ 18V
l
–1.5 0 1.5 µA
I
LEAK-CSN
CSN Leakage Current SHDN = 0V or DCIN = 0V,
0V ≤ CSP = CSN = BAT ≤ 20V
l
–1.5 0 1.5 µA
I
LEAK-CSP
CSP Leakage Current SHDN = 0V or DCIN = 0V,
0V ≤ CSP = CSN = BAT ≤ 20V
l
–1.5 0 1.5 µA
I
LEAK-SW
SW Leakage Current SHDN = 0V or DCIN = 0V,
0V ≤ SW ≤ 20V
l
–1 0 2 µA
INTV
DD
Regulator
INTV
DD
Output Voltage No Load
l
4.85 5 5.15 V
∆V
DD
Load Regulation I
DD
= 20mA –0.4 –1 %
I
DD
Short-Circuit Current (Note 5) INTV
DD
= 0V 50 85 130 mA
Switching Regulator
I
ITH
ITH Current ITH = 1.4V –40/+90 µA
f
TYP
Typical Switching Frequency 467 550 633 kHz
f
MIN
Minimum Switching Frequency C
LOAD
= 3.3nF 20 25 kHz
DC
MAX
Maximum Duty Cycle C
LOAD
= 3.3nF 98 99 %
t
R-TG
TGATE Rise Time C
LOAD
= 3.3nF, 10% – 90% 60 110 ns
t
F-TG
TGATE Fall Time C
LOAD
= 3.3nF, 90% – 10% 50 110 ns
t
R-BG
BGATE Rise Time C
LOAD
= 3.3nF, 10% – 90% 60 110 ns
t
F-BG
BGATE Fall Time C
LOAD
= 3.3nF, 90% – 10% 60 110 ns
t
NO
TGATE, BGATE Non-Overlap Time C
LOAD
= 3.3nF, 10% – 10% 110 ns
PowerPath Control
I
DCIN
DCIN Input Current 0V ≤ DCIN ≤ CLP
l
–10 60 µA
V
FTO
Forward Turn-On Voltage (DCIN Detection Threshold) DCIN-CLP, DCIN rising
l
15 60 mV
V
FR
Forward Regulation Voltage DCIN-CLP
l
15 25 35 mV
V
RTO
Reverse Turn-Off Voltage DCIN-CLP, DCIN falling
l
–45 –25 –15 mV
V
OL(INFET)
INFET Output Low Voltage, Relative to CLP DCIN-CLP = 0.1V, I
INFET
=1µA –6.5 –5 V
V
OH(INFET)
INFET Output High Voltage, Relative to CLP DCIN-CLP = –0.1V, I
INFET
=–5µA –250 250 mV
t
IF(ON)
INFET Turn-On Time To CLP-INFET > 3V, C
INFET
= 1nF 85 180 µs
t
IF(OFF)
INFET Turn-Off Time To CLP-INFET < 1.5V, C
INFET
= 1nF 2.5 6 µs
Float Voltage Select Inputs (LTC4012-1/LTC4012-2 Only)
V
IL
Input Voltage Low 0.5 V
V
IH
Input Voltage High 3.5 V
I
IN
Input Current 0V ≤ V
IN
≤ 5V –10 10 µA
Indicator Outputs
V
OL
Output Voltage Low I
LOAD
= 100µA, PROG = 1.2V 500 mV
I
LEAK
Output Leakage SHDN = 0V, DCDIV = 0V,
V
OUT
= 20V
l
–10 10 µA
I
C10
CHRG C/10 Current Sink CHRG = 2.5V
l
15 25 38 µA
