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LTC4012-3_15 Datasheet, PDF (4/28 Pages) Linear Technology – High Efficiency, Multi-Chemistry Battery Charger with PowerPath Control
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LTC4012-3
Electrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. DCIN = 20V, BAT = 12V, GND = 0V unless otherwise noted. (Note 2)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
INTVDD Regulator
INTVDD Output Voltage
ΔVDD
Load Regulation
IDD
Short-Circuit Current (Note 5)
Switching Regulator
No Load
IDD = 20mA
INTVDD = 0V
l 4.85
5
5.15
V
–0.4
–1
%
50
85
130
mA
VACP
AC Present Charge Enable Threshold Voltage
DCIN – BAT, DCIN Rising
C-Grade
I-Grade
l 350
500
650
mV
l 300
700
mV
IITH
ITH Current
fTYP
Typical Switching Frequency
fMIN
Minimum Switching Frequency
DCMAX
Maximum Duty Cycle
tR-TG
TGATE Rise Time
tF-TG
TGATE Fall Time
tR-BG
BGATE Rise Time
tF-BG
BGATE Fall Time
tNO
TGATE, BGATE Non-Overlap Time
PowerPath Control
ITH = 1.4V
CLOAD = 3.3nF
CLOAD = 3.3nF
CLOAD = 3.3nF, 10% – 90%
CLOAD = 3.3nF, 90% – 10%
CLOAD = 3.3nF, 10% – 90%
CLOAD = 3.3nF, 90% – 10%
CLOAD = 3.3nF, 10% – 10%
–40/+90
µA
467
550
633
kHz
20
25
kHz
98
99
%
60
110
ns
50
110
ns
60
110
ns
60
110
ns
110
ns
IDCIN
DCIN Input Current
0V ≤ DCIN ≤ CLP
l –10
60
µA
VFTO
Forward Turn-On Voltage (DCIN Detection Threshold) DCIN-CLP, DCIN Rising
l 15
60
mV
VFR
Forward Regulation Voltage
DCIN-CLP
l 15
25
35
mV
VRTO
Reverse Turn-Off Voltage
DCIN-CLP, DCIN Falling
l –45
–25
–15
mV
VOL(INFET) INFET Output Low Voltage, Relative to CLP
DCIN-CLP = 0.1V, IINFET =1µA
–6.5
–5
V
VOH(INFET) INFET Output High Voltage, Relative to CLP
DCIN-CLP = –0.1V, IINFET =–5µA
–250
250
mV
tIF(ON)
INFET Turn-On Time
To CLP-INFET > 3V, CINFET = 1nF
85
180
µs
tIF(OFF)
INFET Turn-Off Time
To CLP-INFET < 1.5V, CINFET = 1nF
2.5
6
µs
Indicator Outputs
VOL
Output Voltage Low
ILEAK
Output Leakage
IC10
CHRG C/10 Current Sink
ILOAD = 100µA, PROG = 1.2V
500
mV
SHDN = 0V, DCIN = 0V, VOUT = 20V l –10
10
µA
CHRG = 2.5V
l 15
25
38
µA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 3: Operating junction temperature TJ (in °C) is calculated from
the ambient temperature TA and the total continuous package power
dissipation PD (in watts) by the formula TJ = TA + (θJA • PD). Refer to the
Applications Information section for details.
Note 2: The LTC4012C-3 is guaranteed to meet performance specifications
over the 0°C to 85°C operating temperature range. The LTC4012I-3 is
guaranteed to meet performance specifications over the –40°C to 125°C
operating temperature range.
Note 4: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to GND, unless otherwise
specified.
Note 5: Output current may be limited by internal power dissipation. Refer
to the Applications Information section for details.
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