Datasheet

LTC3823
3
3823fd
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Main Control Loop
I
Q
Input DC Supply Current Normal Operation
Shutdown Supply Current
1400
30
2200
50
μA
μA
V
FB
Feedback Voltage Accuracy (Note 3) I
TH
= 1.2V (0°C to 85°C)
I
TH
= 1.2V
l
0.596
0.594
0.6
0.6
0.604
0.606
V
V
V
FB(LINEREG)
Feedback Voltage Line Regulation V
IN
= 4.5V to 30V, I
TH
= 1.2V (Note 3) 0.002 %/V
V
FB(LOADREG)
Feedback Voltage Load Regulation I
TH
= 0.5V to 1.9V (Note 3) –0.04 –0.3 %
V
RUN
RUN Pin On Threshold V
RUN
Rising 1 1.5 1.9 V
I
SS/TRACK
Soft-Start Charge Current V
SS/TRACK
= 0V –1.3 –1.7 –2.3 μA
I
FB
Feedback Pin Input Current –100 –20 100 nA
g
m(EA)
Error Amplifi er Transconductance I
TH
= 1.2V (Note 3)
l
1.65 mS
V
FCB
Forced Continuous Threshold
l
0.57 0.6 0.63 V
I
FCB
Forced Continuous Pin Current V
FCB
= 0V –1 –2 μA
t
ON
On-Time I
ON
= –60μA, V
ON
= 1.5V
I
ON
= –60μA, V
ON
= 0V
210
80
250
115
290
150
ns
ns
t
ON(MIN)
Minimum On-Time I
ON
= –180μA, V
ON
= 0V 50 100 ns
t
OFF(MIN)
Minimum Off-Time 280 400 ns
V
SENSE(MAX)
Maximum Current Sense Threshold V
RNG
= 1V, V
FB
= 570mV (0°C to 85°C)
V
RNG
= 0V, V
FB
= 570mV (0°C to 85°C)
V
RNG
= INTV
CC
, V
FB
= 570mV (0°C to 85°C)
120
50
240
140
70
280
160
85
320
mV
mV
mV
V
SENSE(MIN)
Minimum Current Sense Threshold V
RNG
= 1V, V
FB
= 630mV
V
RNG
= 0V, V
FB
= 630mV
V
RNG
= INTV
CC
, V
FB
= 630mV
–60
–30
–120
mV
mV
mV
ΔV
FB(OV)
Output Overvoltage Fault Threshold Offset 8 11 14 %
V
IN(UVLO
+
)
Undervoltage Lockout V
IN
Falling 3.1 3.4 V
V
IN(UVLO
–
)
Undervoltage Lockout V
IN
Rising 3.9 4.1 V
TG R
UP
TG Driver Pull-Up On-Resistance TG High 1.9 2.5 Ω
TG R
DOWN
TG Driver Pull-Down On-Resistance TG Low 1.2 2.5 Ω
BG R
UP
BG Driver Pull-Up On-Resistance BG High 1.9 3 Ω
BG R
DOWN
BG Driver Pull-Down On-Resistance BG Low 0.7 1.5 Ω
TG t
r
TG Rise Time C
LOAD
= 3300pF 20 ns
TG t
f
TG Fall Time C
LOAD
= 3300pF 20 ns
BG t
r
BG Rise Time C
LOAD
= 3300pF 20 ns
BG t
f
BG Fall Time C
LOAD
= 3300pF 20 ns
Internal V
CC
Regulation
V
INTVCC
Internal V
CC
Voltage 6V < V
IN
< 36V
l
4.75 5 5.45 V
ΔV
LDO(LOADREG)
Internal V
CC
Load Regulation I
CC
= 0mA to 20mA –0.1 ±2 %
Phase-Locked Loop
R
PLLIN
PLLIN Input Resistance 50 kΩ
I
PLLFLTR
Phase Detector Sink Current
Phase Detector Source Current
f
PLLIN
< f
O
f
PLLIN
> f
O
–15
15
μA
μA
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 15V unless otherwise specifi ed.