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| LTC1142_15 Datasheet, PDF (3/20 Pages) Linear Technology – Dual High Efficiency Synchronous Step-Down Switching Regulators | |||
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LTC1142/LTC1142L/LTC1142HV
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. V10 = V24 = 10V, VSHDN = 0V unless otherwise noted.
SYMBOL
V1 â V28
V15 â V14
PARAMETER
Input DC Supply Current (Note 3)
Normal Mode
Sleep Mode
Shutdown
Input DC Supply Current (Note 3)
Normal Mode
Sleep Mode
Shutdown
Current Sense Threshold Voltage
VSHDN
ISHDN
I11, I24
tOFF
tr, tf
Shutdown Pin Threshold
Shutdown Pin Input Current
CT Pin Discharge Current
Off-Time (Note 4)
Driver Output Transition Times
CONDITIONS
LTC1142HV, LTC1142HV-ADJ
4V < V10, V24 < 18V
4V < V24 < 18V, 6V < V10 < 18V
VSD1 = VSD2 = 2.1V, 4V < V10, V24 < 18V
LTC1142L-ADJ (Note 6)
3.5V < V10, V24 < 12V
3.5V < V10, V24 < 12V
VSD1 = VSD2 = 2.1V, 3.5V < V10, V24 < 12V
LTC1142HV-ADJ, LTC1142L-ADJ
V14 = V28 = VOUT + 100mV, V2 = V16 = VREF + 25mV
V14 = V28 = VOUT â 100mV, V2 = V16 = VREF â 25mV q
LTC1142, LTC1142HV
V28 = VOUT + 100mV (Forced)
V28 = VOUT â 100mV (Forced)
q
LTC1142, LTC1142HV
V14 = VOUT + 100mV (Forced)
V14 = VOUT â 100mV (Forced)
q
0V < VSHDN < 8V, V10, V24 = 16V
VOUT in Regulation, VSENSE â = VOUT
VOUT = 0V
CT = 390pF, ILOAD = 700mA
CL = 3000pF (Pins 6, 9, 20, 23), V10, V24 = 6V
MIN TYP MAX
1.6
2.3
160 250
10
22
1.6 2.1
160 230
10 20
25
130 150 170
25
130 150 170
25
130 150 170
0.5 0.8 2
1.2 5
50 70 90
2
10
4
5
6
100 200
UNITS
mA
µA
µA
mA
µA
µA
mV
mV
mV
mV
mV
mV
V
µA
µA
µA
µs
ns
â 40°C ⤠TA ⤠85°C (Note 5), V10 = V24 = 10V, unless otherwise noted.
SYMBOL
V2, V16
I2, I16
VOUT
I10, I24
V1 â V28
V15 â V14
PARAMETER
Feedback Voltage
Feedback Current
Regulated Output Voltage
3.3V Output
5V Output
Input DC Supply Current (Note 3)
Normal Mode
Sleep Mode
Shutdown
Input DC Supply Current (Note 3)
Normal Mode
Sleep Mode
Shutdown
Input DC Supply Current (Note 3)
Normal Mode
Sleep Mode
Shutdown
Current Sense Threshold Voltage
CONDITIONS
LTC1142HV-ADJ Only: V10, V24 = 9V
LTC1142HV-ADJ Only
LTC1142, LTC1142HV
ILOAD = 700mA, V24 = 9V
ILOAD = 700mA, V10 = 9V
LTC1142
4V < V10, V24 < 12V
4V < V24 < 12V, 6V < V10 < 12V
VSHDN = 2.1V, 4V < V10, V24 < 12V
LTC1142HV-ADJ, LTC1142HV
4V < V10, V24 < 18V
4V < V24 < 18V, 6V < V10 < 18V
VSHDN = 2.1V, 4V < V10, V24 < 12V
LTC1142L-ADJ (Note 6)
3.5V < V10, V24 < 12V
3.5V < V10, V24 < 12V
VSD1 = VSD2 = 2.1V, 3.5V < V10, V24 < 12V
LTC1142HV-ADJ, LTC1142L-ADJ
V14 = V28 = VOUT + 100mV, V2 = V16 = VREF + 25mV
V14 = V28 = VOUT â 100mV, V2 = V16 = VREF â 25mV
LTC1142, LTC1142HV
V28 = VOUT + 100mV (Forced)
V28 = VOUT â 100mV (Forced)
MIN TYP MAX
1.21 1.25 1.29
0.2 1
UNITS
V
µA
3.17 3.33 3.43
V
4.85 5.05 5.20
V
1.6 2.4
mA
160 260
µA
10 22
µA
1.6 2.6
mA
160 280
µA
10 24
µA
1.6 2.4
mA
160 260
µA
10 22
µA
25
mV
125 150 175
mV
25
mV
125 150 175
mV
3
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