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| LTC3417A-2 Datasheet, PDF (3/20 Pages) Linear Technology – Dual Synchronous 1.5A/1A 4MHz Step-Down DC/DC Regulator | |||
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LTC3417A-2
ELECTRICAL CHARACTERISTICS The l denotes the speciï¬cations which apply over the full operating
temperature range, otherwise speciï¬cations are at TA = 25°C. VIN = 3.6V unless otherwise speciï¬ed (Note 2).
SYMBOL
PARAMETER
CONDITIONS
MIN
VIN1, VIN2
IFB1, IFB2
VFB1, VFB2
ÎVLINEREG
ÎVLOADREG
gm(EA)
IS
IS
fOSC
ILIM1
ILIM2
RDS(ON)1
RDS(ON)2
ISW1(LKG)
ISW2(LKG)
VUVLO
TPGOOD
Operating Voltage Range
VIN1 = VIN2
Feedback Pin Input Current
VIN = 6V Pin Under Test = 3V
Feedback Voltage
(Note 3)
l
Reference Voltage Line Regulation. %/V VIN = 2.25V to 5V (Note 3)
is the Percentage Change in VOUT with a
Change in VIN
Output Voltage Load Regulation
ITH1, ITH2 = 0.36V (Note 3)
ITH1, ITH2 = 0.84V (Note 3)
Error Ampliï¬er Transconductance
ITH1, ITH2(PINLOAD) = ±5μA (Note 3)
Input DC Supply Current (Note 4)
Active Mode
VFB1 = VFB2 = 0.75V, VSYNC/MODE = VIN,
VRUN1 = VRUN2 = VIN
Half Active Mode (VRUN2 = 0V, 1.5A Only) VFB1 = 0.75V, VSYNC/MODE = VIN, VRUN1 = VIN
Half Active Mode (VRUN1 = 0V, 1A Only) VFB2 = 0.75V, VSYNC/MODE = VIN, VRUN2 = VIN
Both Channels in Sleep Mode
VFB1 = VFB2 = 1V, VSYNC/MODE = VIN, VRUN1 =
VRUN2 = VIN
Shutdown
VRUN1 = VRUN2 = 0V
Oscillator Frequency
VFREQ = VIN
VFREQ: RT = 143k
VFREQ: Resistor (Note 6)
Peak Switch Current Limit on SW1 (1.5A)
Peak Switch Current Limit on SW2 (1A)
SW1 Top Switch On-Resistance (1.5A)
SW1 Bottom Switch On-Resistance
SW2 Top Switch On-Resistance (1A)
SW2 Bottom Switch On-Resistance
Switch Leakage Current SW1 (1.5A)
Switch Leakage Current SW2 (1A)
Undervoltage Lockout Threshold
Threshold for Power Good. Percentage
Deviation from VFB Steady State
(Typically 0.8V)
VIN1 = 3.6V (Note 5)
VIN1 = 3.6V (Note 5)
VIN2 = 3.6V (Note 5)
VIN2 = 3.6V (Note 5)
VIN1 = 6V, VITH1 = 0V, VRUN1 = 0V
VIN2 = 6V, VITH2 = 0V, VRUN2 = 0V
VIN1, VIN2 Ramping Down
VIN1, VIN2 Ramping Up
VFB1 or VFB2 Ramping Up
VFB1 or VFB2 Ramping Down
2.25
0.784
1.2
0.85
2.1
1.4
1.9
1.95
RPGOOD
Power Good Pull-Down On-Resistance
VRUN1, VRUN2
RUN1, RUN2 Threshold
0.3
VPHASE
PHASE Threshold High-CMOS Levels
PHASE Threshold Low-CMOS Levels
VIN â0.5
IRUN1, IRUN2, IPHASE, RUN1, RUN2, PHASE and SYNC/MODE
ISYNC/MODE
Leakage Current
VTLSYNC/MODE
SYNC/MODE Threshold Voltage Low
VIN = 6V, Pin Under Test = 3V
VTHSYNC/MODE
SYNC/MODE Threshold Voltage High
VIN â0.5
VTHFREQ
FREQ Threshold Voltage High
VIN â0.5
TYP
0.8
0.02
0.02
â0.02
1400
400
260
260
125
0.01
1.5
1
2.5
1.7
0.088
0.084
0.16
0.15
0.01
0.01
2.07
2.12
â6
â6
120
0.85
±0.01
MAX
5.5
± 0.1
0.816
0.2
UNITS
V
μA
V
%/V
0.2
%
â0.2
%
μS
600
μA
400
μA
400
μA
250
μA
1
μA
1.8 MHz
1.25 MHz
4
MHz
A
A
Ω
Ω
Ω
Ω
1
μA
1
μA
2.2
V
2.25
V
%
%
300
Ω
1.5
V
V
0.5
V
±1
μA
0.5
V
V
V
3417a2fa
3
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