LTC1421(Rev_A) View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC1421 Datasheet PDF : 24 Pages
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LTC1421/LTC1421-2.5
ELECTRICAL CHARACTERISTICS VCCHI = 12V, VCCLO = 5V, TA = 25°C unless otherwise noted (Note 2).
SYMBOL PARAMETER
IRAMP
ICP
RAMP Pin Output Current
Charge Pump Output Current
∆VGATEHI
∆VGATELO
VAUXVCC
VIL
VIH
IIN
VOL
GATEHI N-Channel Gate Drive
GATELO N-Channel Gate Drive
Auxiliary VCC Output Voltage
Input Low Voltage
Input High Voltage
Input Current
Output Low Voltage
VOH
Output High Voltage
IPU
Logic Output Pull-Up Current
AC CHARACTERISTICS
t1
CON1 or CON2↓ to CPON↑
t2
PWRGD↑ to RESET↑
t3
PWRGD↑ to DISABLE↓
t4
POR↓ to CPON↓
t5
PWRGD↓ to RESET↓
t6
POR↑ to CPON↑
t7
CON1 or CON2↑ to CPON↓
t9
Short-Circuit Detect to FAULT↓
t10
Short-Circuit Detect to CPON↓
t11
POR↑ to FAULT↑
tCHL
Comparator High to Low
tCLH
Comparator Low to High
CONDITIONS
MIN TYP MAX
Charge Pump On, VRAMP = 0.4V
Charge Pump On, GATEHI = 0V
GATELO = 0V
q 11
17
23
– 600
– 300
VGATEHI − VOUTHI
VGATELO − VOUTLO
VCCLO = 5V, Unloaded
CON1, CON2, POR
6
16
10
16
4.5
q
0.8
CON1, CON2, POR
q2
CON1, CON2, POR = GND
q – 30 – 60 – 90
RESET, COMPOUT, PWRGD, DISABLE, FAULT, q
IO = 3mA
CPON, IO = 3mA
q
DISABLE, IO = – 3mA
q4
CPON, IO = – 1mA
q 3.4
RESET, PWRGD, FAULT = GND
0.4
1.45
– 15
Figure 1, CL = 15pF
Figure 1, RL = 10k to VCCLO, CL = 15pF
Figure 1, CL = 15pF
Figure 1, CL = 15pF
Figure 1, RL = 10k to VCCLO, CL = 15pF
Figure 1, CL = 15pF
Figure 1, CL = 15pF
Figure 1, RL = 10k to VCCLO, CL = 15pF
VCCLO – SETLO = 0mV to 100mV
Figure 2, CL = 15pF
VCCLO – SETLO = 0mV to 100mV
Figure 2, RL = 10k to VCCLO, CL = 15pF
COMP – = 1.232V, 10mV Overdrive
RL = 10k to VCCLO, CL = 15pF
COMP – = 1.232V, 10mV Overdrive
RL = 10k to VCCLO, CL = 15pF
q 15
20
30
160 200 240
q 140 200 280
160 200 240
q 140 200 280
q 15
20
30
32
50
50
20
20
20
q
0.25 0.5
q
1
1.5
UNITS
µA
µA
µA
V
V
V
V
V
µA
V
V
V
V
µA
ms
ms
ms
ms
ms
ms
µs
ns
ns
µs
µs
ns
µs
µs
The q denotes specifications which apply over the full operating temperature
range.
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 reference to ground unless otherwise
specified.
Note 3: After power-on reset, the VOUTLO and VOUTHI have to drop below the
VTRIP point before the charge pump is restarted.
Note 4: After power-on reset, the VOUTLO has to drop below the VTRIP point
before the charge pump is restarted.
3
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