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| LTC3868-1 Datasheet, PDF (3/38 Pages) Linear Technology – Low IQ, Dual 2-Phase Synchronous Step-Down Controller | |||
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LTC3868-1
Electrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VRUN1,2 = 5V, EXTVCC = 0V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIN
VFB1,2
IFB1,2
VREFLNREG
VLOADREG
Input Supply Operating Voltage Range
Regulated Feedback Voltage
Feedback Current
Reference Voltage Line Regulation
Output Voltage Load Regulation
gm1,2
IQ
Transconductance Amplifier gm
Input DC Supply Current
Pulse-Skipping or Forced Continuous
Mode
(One Channel On)
Pulse-Skipping or Forced Continuous
Mode
(Both Channels On)
(Note 4) ITH1,2 Voltage = 1.2V
(Note 4)
(Note 4) VIN = 4.5V to 24V
(Note4)
Measured in Servo Loop,
âITH Voltage = 1.2V to 0.7V
(Note4)
Measured in Servo Loop,
âITH Voltage = 1.2V to 2V
(Note 4) ITH1,2 = 1.2V, Sink/Source = 5µA
(Note 5)
RUN1 = 5V and RUN2 = 0V or
RUN1 = 0V and RUN2 = 5V,
VFB1 = 0.83V (No Load)
RUN1,2 = 5V, VFB1,2 = 0.83V (No Load)
4
24
V
l 0.788 0.8 0.812
V
±5
±50
nA
0.002 0.02 %/V
l
0.01
0.1
%
l
â0.01 â0.1
%
2
mmho
1.3
mA
2
mA
Sleep Mode (One Channel On)
Sleep Mode (Both Channels On)
Shutdown
RUN1 = 5V and RUN2 = 0V or
RUN1 = 0V and RUN2 = 5V,
VFB1 = 0.83V (No Load)
RUN1,2 = 5V, VFB1,2 = 0.83V (No Load)
RUN1,2 = 0V
170
250
µA
300
450
µA
8
25
µA
UVLO
VOVL
ISENSE+
ISENSEâ
Undervoltage Lockout
Feedback Overvoltage Protection
SENSE+ Pin Current
SENSEâ Pins Current
DFMAX
Maximum Duty Factor
ISS1,2
Soft-Start Charge Current
VRUN1,2 On RUN Pin On Threshold
VRUN1,2 Hyst RUN Pin Hysteresis
VSS1,2 LA SS Pin Latchoff Arming Threshold
VSS1,2 LT SS Pin Latchoff Threshold
IDSC1,2 LT SS Discharge Current
VSENSE(MAX) Maximum Current Sense Threshold
Gate Driver
INTVCC Ramping Up
INTVCC Ramping Down
Measured at VFB1,2, Relative to Regulated
VFB1,2
Each Channel
Each Channel
VOUT1,2 < INTVCC â 0.5V
VOUT1,2 > INTVCC + 0.5V
In Dropout, FREQ = 0V
VSS1,2 = 0V
VRUN1, VRUN2 Rising
VSS1, VSS2 Rising from 1V
VSS1, VSS2 Rising from 2V
Short-Circuit Condition VFB1,2 = 0.5V
VSS1,2 = 4.5V
VFB1,2 = 0.7V, VSENSE1â,2â = 3.3V
l
4
4.2
V
l 3.6
3.8
4
V
7
10
13
%
±1
µA
±1
µA
540
700
µA
98
99.4
%
0.7
1
1.4
µA
l 1.21 1.26 1.31
V
50
mV
1.9
2
2.1
V
1.3
1.5
1.7
V
7
10
13
µA
43
50
57
mV
TG1,2
Pull-Up On-Resistance
Pull-Down On-Resistance
2.5
Ω
1.5
Ω
BG1,2
Pull-Up On-Resistance
Pull-Down On-Resistance
2.4
Ω
1.1
Ω
38681fb
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