LTC3863 Datasheet, PDF (3/36 Pages) Linear Technology – 60V Low IQ Inverting DC/DC Controller Wide Operating VIN Range: 3.5V to 60V

LTC3863
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T_A = 25°C. V_IN = 12V, unless otherwise noted. (Note 4)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Supply
V_IN
V_UVLO
Input Voltage Operating Range
Undervoltage Lockout
3.5
60
V
(V_IN-V_CAP) Ramping Up Threshold
l 3.25 3.50 3.8
V
(V_IN-V_CAP) Ramping Down Threshold
l 3.00 3.25 3.50
V
Hysteresis
0.25
V
I_Q
Input DC Supply Current
Pulse-Skipping Mode
Burst Mode Operation
Shutdown Supply Current
PLLIN/MODE = 0V, FREQ = 0V,
V_FB = 0.83V (No Load)
PLLIN/MODE = Open, FREQ = 0V,
V_FB = 0.83V (No Load)
RUN = 0V
0.77 1.2
mA
50
70
µA
7
12
µA
Output Sensing
V_REG
Regulated Feedback Voltage V_REG = (V_FB – V_FBN) V_ITH = 1.2V (Note 5)
l 0.791 0.800 0.809
V
∆V_REG
∆V_IN
∆V_REG
∆V_ITH
g_m(EA)
Feedback Voltage Line Regulation
Feedback Voltage Load Regulation
Error Amplifier Transconductance
V_IN = 3.8V to 60V (Note 5)
V_ITH = 0.6V to 1.8V (Note 5)
V_ITH = 1.2V, ∆I_ITH = ±5µA (Note 5)
–0.005
0.005
%/V
–0.1 –0.015 0.1
%
1.8
mS
I_FBN
Feedback Negative Input Bias Current
–50 –10
50
nA
Current Sensing
V_ILIM
I_SENSE
Current Limit Threshold (V_IN-V_SENSE)
SENSE Pin Input Current
V_FB = 0.77V
V_SENSE = V_IN
l 85
95
103
mV
0.1
2
µA
Start-Up and Shutdown
V_RUN
V_RUNHYS
I_SS
RUN Pin Enable Threshold
RUN Pin Hysteresis
Soft-Start Pin Charging Current
V_RUN Rising
V_SS = 0V
l 1.22 1.26 1.32
V
150
mV
10
µA
Switching Frequency and Clock Synchronization
f
Programmable Switching Frequency
f_LO
Low Switching Frequency
R_FREQ = 24.9kΩ
R_FREQ = 64.9kΩ
R_FREQ = 105kΩ
FREQ = 0V
105
kHz
375 440 505
kHz
810
kHz
320 350 380
kHz
f_HI
High Switching Frequency
FREQ = Open
485 535 585
kHz
f_SYNC
V_CLK(IH)
V_CLK(LO)
Synchronization Frequency
Clock Input High Level into PLLIN/MODE
Clock Input Low Level into PLLIN/MODE
l 75
l2
l
750
kHz
V
0.5
V
f_FOLD
Foldback Frequency as Percentage of
Programmable Frequency
V_FB = 0V, V_FREQ = 0V
18
%
t_ON(MIN) Minimum On-Time
220
ns
3863f
For more information www.linear.com/3863
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