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| LTC3546_15 Datasheet, PDF (3/30 Pages) Linear Technology – Dual Synchronous, 3A/1A or 2A/2A Configurable Step-Down DC/DC Regulator | |||
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LTC3546
Electrical Characteristics The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C. VIN = VCCA = 3.6V, unless otherwise specified. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
VIN1, VIN1D,
VIN2, VCCA,
VCCD
Operating Voltage Range
VIN1 = VIN1D = VIN2 = VCCA = VCCD
2.25
5.5
V
IFB1, IFB2
Feedback Pin Input Current
(Note 3)
±0.1
µA
VFB1, VFB2
Feedback Voltage
(Note 3)
l 0.588
0.6
0.612
V
ÎVLINEREG
Reference Voltage Line Regulation
%/V is The Percentage Change in VOUT
with a Change in VIN
VIN = 2.25V to 5.5V (Note 3)
0.04
0.2
%/V
ÎVLOADREG Output Voltage Load Regulation
ITH1, ITH2 = 0.36V (Note 3)
ITH1, ITH2 = 0.84V (Note 3)
l
0.02
0.2
%
l
â0.02 â0.2
%
gm(EA)
Error Amplifier Transconductance
(Note 3)
1400
µS
VTRACK/SS1,
VTRACK/SS2
Tracking Voltage Offset
VTRACK/SS1,2 = 0.3V
15
mV
ITRACK/SS1,
ITRACK/SS2
Tracking Current Source
VTRACK/SS1,2 = 0V
0.8
1.15
1.5
µA
IS
Input DC Supply Current (Note 4)
Active Mode
VFB1 = VFB2 = 0.55V, VMODE = VIN,
VRUN1 = VRUN2 = VIN
600
990
µA
Half Active Mode (VRUN1 = VIN, VRUN2 = 0) VFB1 = 0.55V, VMODE = VIN, VRUN1 = VIN,
VRUN2 = 0V
400
800
µA
Half Active Mode (VRUN1 = 0, VRUN2 = VIN) VFB2 = 0.55V, VMODE = VIN, VRUN1 = 0V,
VRUN2 = VIN
400
800
µA
Both Channels in Sleep Mode
VFB1 = VFB2 = 0.75V, VMODE = VIN,
VRUN1 = VRUN2 = VIN
160
300
µA
Shutdown
VRUN1 = VRUN2 = 0V
0.2
1
µA
fOSC
Oscillator Frequency
VFREQ: RT = VIN
VFREQ: RT = 143k
VFREQ: Resistor (Note 5)
1.8
2.25
2.9
MHz
l 1.2
1.5
1.8
MHz
0.75
4
MHz
ILIM1
Peak Switch Current Limit on SW1 (1A) BMC1 = VIN, VITH1 = 1.4V
BMC1 = 0.4V, VITH1 = 0V
1.4
1.6
A
0.45
A
ILIM2
Peak Switch Current Limit on SW2A/B (2A) BMC2 = VIN, VITH1 = 1.4V
BMC2 = 0.4V, VITH1 = 0V
2.8
3.2
A
0.9
A
ILIM1+1D
Peak Switch Current Limit on
SW1 Externally Connected to SW1D
SW1 + SW1D (2A)
BMC1 = VIN (Note 8)
2.5
3.2
A
BMC1 = 0.4V (Note 8)
1.6
A
ILIM2+1D
Peak Switch Current Limit on
SW2A/B Externally Connected to SW1D
SW2A/B + SW1D (3A)
BMC2 = VIN (Note 8)
3.75
4.8
A
BMC2 = 0.4V (Note 8)
2.4
A
RDS(ON)1
RDS(ON)1D
RDS(ON)2
ISW1(LKG)
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
VIN2 = 3.6V
VIN2 = 3.6V
VIN2 = 3.6V
VIN2 = 3.6V
VIN1 = 3.6V
VIN1 = 3.6V
VIN = 6V
VITH1 = 0V
VRUN1 = 0V
0.19
Ω
0.18
Ω
0.19
Ω
0.17
Ω
0.096
Ω
0.085
Ω
0.01
1
µA
For more information www.linear.com/3546
3546fc
3
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