Datasheet
LTC3812-5
3
38125fc
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Main Control Loop
INTV
CC
INTV
CC
Supply Voltage
l
4.35 14 V
I
Q
INTV
CC
Supply Current
INTV
CC
Shutdown Current
RUN/SS > 1.5V (Notes 4, 5)
RUN/SS = 0V
3
224
6
600
mA
μA
I
BOOST
BOOST Supply Current RUN/SS > 1.5V (Note 5)
RUN/SS = 0V
240
0
400
5
μA
μA
V
FB
Feedback Voltage (Note 4)
0°C to 85°C
–40°C to 85°C
–40°C to 125°C
l
l
l
0.796
0.794
0.792
0.792
0.800
0.800
0.800
0.800
0.804
0.806
0.806
0.808
V
V
V
V
∆V
FB,LINE
Feedback Voltage Line Regulation 5V < INTV
CC
< 14V (Note 4)
l
0.002 0.02 %/V
V
SENSE(MAX)
Maximum Current Sense Threshold V
RNG
= 2V, V
FB
= 0.76V
V
RNG
= 0V, V
FB
= 0.76V
V
RNG
= INTV
CC
, V
FB
= 0.76V
256
70
170
320
95
215
384
120
260
mV
mV
mV
V
SENSE(MIN)
Minimum Current Sense Threshold V
RNG
= 2V, V
FB
= 0.84V
V
RNG
= 0V, V
FB
= 0.84V
V
RNG
= INTV
CC
, V
FB
= 0.84V
–300
–85
–200
mV
mV
mV
I
VFB
Feedback Current V
FB
= 0.8V 20 150 nA
A
VOL
(EA) Error Amplifi er DC Open-Loop Gain 65 100 dB
f
U
Error Amp Unity Gain Crossover
Frequency
(Note 6) 25 MHz
V
FCB
FCB Threshold V
FCB
Rising 0.75 0.8 0.85 V
I
FCB
FCB Current FCB = 5V 0 1 μA
V
RUN/SS
Shutdown Threshold 1.2 1.5 2 V
I
RUN/SS
RUN/SS Source Current RUN/SS
= 0V 0.7 1.4 2.5 μA
V
VCCUV
INTV
CC
Undervoltage Lockout
Linear Regulator Mode
External Supply Mode
Trickle-Charge Mode
INTV
CC
Rising, I
NDRV
= 100μA
INTV
CC
Rising, NDRV
= INTV
CC
= EXTV
CC
INTV
CC
Rising, NDRV
= INTV
CC
, EXTV
CC
= 0
INTV
CC
Falling
l
l
l
4.05
4.05
8.70
4.2
4.2
9.0
3.7
4.35
4.35
9.30
V
V
V
V
Oscillator
t
ON
On-Time I
ON
= 100μA
I
ON
= 300μA
1.55
515
1.85
605
2.15
695
μs
ns
t
ON(MIN)
Minimum On-Time I
ON
= 2500μA 100 ns
t
OFF(MIN)
Minimum Off-Time 250 350 ns
Driver
I
BG,PEAK
BG Driver Peak Source Current V
BG
= 0V 0.7 1 A
R
BG,SINK
BG Driver Pull-Down R
DS(ON)
1 1.5 Ω
I
TG,PEAK
TG Driver Peak Source Current V
TG
–
V
SW
= 0V 0.7 1 A
R
TG,SINK
TG Driver Pull-Down R
DS(ON)
1 1.5 Ω
PGOOD Output
∆V
FBOV
PGOOD Upper Threshold
PGOOD Lower Threshold
V
FB
Rising
V
FB
Falling
7.5
–7.5
10
–10
12.5
–12.5
%
%
∆V
FB,HYST
PGOOD Hysterisis V
FB
Returning 1.5 3 %
V
PGOOD
PGOOD Low Voltage I
PGOOD
= 5mA 0.3 0.6 V
The l denotes specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C (Note 2), INTV
CC
= V
BOOST
= V
RNG
= V
EXTVCC
= V
NDRV
= 5V, V
FCB
= V
SW
=
0V, unless otherwise specifi ed.
ELECTRICAL CHARACTERISTICS