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| LTC3546 Datasheet, PDF (3/28 Pages) Linear Technology – Dual Synchronous, 3A/1A or 2A/2A Confi gurable Step-Down DC/DC Regulator | |||
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LTC3546
ELECTRICAL CHARACTERISTICS The l denotes the speciï¬cations which apply over the full operating
junction temperature range, otherwise speciï¬cations are at TA = 25°C. VIN = VCCA = 3.6V, unless otherwise speciï¬ed. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
VTRACK/SS1,
Tracking Voltage Offset
VTRACK/SS1,2 = 0.3V
15
VTRACK/SS2
ITRACK/SS1,
ITRACK/SS2
Tracking Current Source
VTRACK/SS1,2 = 0V
0.8
1.15
1.5
IS
Input DC Supply Current (Note 4)
Active Mode
VFB1 = VFB2 = 0.55V, VMODE = VIN,
VRUN1 = VRUN2 = VIN
600
990
Half Active Mode (VRUN1 = VIN, VRUN2 = 0) VFB1 = 0.55V, VMODE = VIN, VRUN1 = VIN,
VRUN2 = 0V
400
800
Half Active Mode (VRUN1 = 0, VRUN2 = VIN) VFB2 = 0.55V, VMODE = VIN, VRUN1 = 0V,
VRUN2 = VIN
400
800
Both Channels in Sleep Mode
VFB1 = VFB2 = 1V, VMODE = VIN,
VRUN1 = VRUN2 = VIN
160
300
Shutdown
VRUN1 = VRUN2 = 0V
0.2
1
fOSC
Oscillator Frequency
VFREQ: RT = VIN
VFREQ: RT = 143k
VFREQ: Resistor (Note 5)
1.8
2.25
2.9
l 1.2
1.5
1.8
0.75
4
ILIM1
Peak Switch Current Limit on SW1 (1A) BMC1 = VIN, VITH1 = 1.3V
BMC1 = 0.4V, VITH1 = 0V
1.4
1.6
0.45
ILIM2
Peak Switch Current Limit on SW2A/B
BMC2 = VIN, VITH1 = 1.3V
(2A)
BMC2 = 0.4V, VITH1 = 0V
2.8
3.2
0.9
ILIM1+1D
Peak Switch Current Limit on
SW1 + SW1D (2A)
SW1 externally connected to SW1D
BMC1 = VIN (Note 8)
BMC1 = 0.4V (Note 8)
2.5
3.2
1.6
ILIM2+1D
Peak Switch Current Limit on
SW2A/B + SW1D (3A)
SW2A/B externally connected to SW1D
BMC2 = VIN (Note 8)
BMC2 = 0.4V (Note 8)
3.75
4.8
2.4
RDS(ON)1
RDS(ON)1D
RDS(ON)2
ISW1(LKG)
ISW1D(LKG)
ISW2A/B(LKG)
VUVLO
SW1 Top Switch On-Resistance (1A)
SW1 Bottom Switch On-Resistance
SW1D Top Switch On-Resistance (1A)
SW1D Bottom Switch On-Resistance
SW2A/B Top Switch On-Resistance (2A)
SW2A/B Bottom Switch On-Resistance
Switch Leakage Current SW1
Switch Leakage Current SW1D
Switch Leakage Current SW2A/B
Undervoltage Lockout Threshold
VIN2 = 3.6V
VIN2 = 3.6V
VIN2 = 3.6V
VIN2 = 3.6V
VIN1 = 3.6V
VIN1 = 3.6V
VIN = 6V
VITH1 = 0V
VRUN1 = 0V
VIN = 6V
VITH1 = VITH2 = 0V
VRUN1 = VRUN2 = 0V
VIN = 6V
VITH2 = 0V
VRUN2 = 0V
VIN1, VIN2, VCCA, VCCD Rising
VIN1, VIN2, VCCA, VCCD Falling
0.19
0.18
0.19
0.17
0.096
0.085
0.01
1
0.01
1
0.01
1
2.03
2.14
2.2
1.86
1.97
2.03
UNITS
mV
μA
μA
μA
μA
μA
μA
MHz
MHz
MHz
A
A
A
A
A
A
A
A
Ω
Ω
Ω
Ω
Ω
Ω
μA
μA
μA
V
V
3546f
3
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