LTC1645CS View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC1645CS Datasheet PDF : 24 Pages
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LTC1645
ELECTRICAL CHARACTERISTICS
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
2.375V ≤ VCC1 ≤ 12V, 1.2V ≤ VCC2 ≤ 12V unless otherwise noted (Note 2).
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
VTM
TIMER Pin Voltage Threshold
q 1.212 1.230 1.248
V
∆VTM TIMER Pin Threshold Line Regulation VCC1 = 2.375V to 12V
q
1
9
mV
ITM
TIMER Pin Current
Timer On, VTIMER = 0.6V, VCC1 = 5V
Timer Off, VTIMER = 1.5V
q – 2.3
–2
– 1.7
µA
12
mA
VCB1
Circuit Breaker Trip Voltage 1
VCB1 = (VCC1 – VSENSE1)
q 46
50
56
mV
VCB2
Circuit Breaker Trip Voltage 2
VCB2 = (VCC2 – VSENSE2)
q 46
50
56
mV
tCBDn Circuit Breaker Trip Delay
VCBn = (VCCn – VSENSEn) > 60mV
1.5
µs
ICP
GATEn Pin Output Current
ON = 2.2V, VGATEn = VCCn, VCC1 = 5V, VCC2 = 3.3V
q – 12.5 – 10
– 7.5
µA
ON = 0.7V, VGATEn = VCCn, VCC1 = 5V, VCC2 = 3.3V
q
30
40
50
µA
ON = 0.3V, VGATEn = VCCn, VCC1 = 5V, VCC2 = 3.3V
12
mA
∆VGATEn External N-Channel Gate Drive
∆VGATEn = (VGATEn – VCCn)
q 4.5
16
V
VONFPD ON Pin Fast Pull-Down Threshold
Low to High
High to Low, Fast Pull-Down Engaged
q 0.375 0.4 0.425
V
q 0.35 0.375 0.4
V
VON1
ON Pin Threshold #1
Low to High, GATE1 Turns On
High to Low, GATE1 Turns Off
q 0.8 0.825 0.85
V
q 0.775 0.8 0.825
V
VON2
ON Pin Threshold #2
Low to High, GATE2 Turns On
High to Low, GATE2 Turns Off
q
2
2.025 2.050
V
q 1.975
2
2.025
V
VONHYST
ION
VOL
ON Pin Hysteresis
ON Pin Input Current
Output Low Voltage
VCC1 = 5V, VCC2 = 3.3V
q
RESET, FAULT, COMPOUT, IOUT = 1.6mA, VCC1 = 5V q
25
mV
±0.01 ±2
µA
0.16
0.4
V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to ground unless otherwise
specified.
Note 3: An internal zener on the GATEn pins clamps the charge pump
voltage to a typical maximum operating voltage of 22V. External overdrive
of a GATE pin (for example, from capacitive coupling of VCCn glitches)
beyond the internal zener voltage may damage the device. If a lower
GATEn pin clamp voltage is desired, use an external zener diode.
TYPICAL PERFOR A CE CHARACTERISTICS
VCC1 Supply Current vs Voltage
3.0
TA = 25°C
2.5
2.0
1.5
VCC2 = 1.5V
1.0
VCC2 = 12V
0.5
0
2 3 4 5 6 7 8 9 10 11 12
VCC1 (V)
1645 G01
VCC2 Supply Current vs Voltage
3.5
TA = 25°C
3.0
2.5
2.0
VCC1 = 2.375V
1.5
1.0
VCC1 = 12V
0.5
0
1 2 3 4 5 6 7 8 9 10 11 12
VCC2 (V)
1645 G02
Supply Current vs Temperature
1.4
VCC1 = 5V
1.2 VCC2 = 3.3V
ICC1
1.0
0.8
0.6
0.4
ICC2
0.2
0
–40 –20
0 20 40 60
TEMPERATURE (°C)
80 100
1645 G03
3
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