LTC3812-5_15 Datasheet, PDF (3/34 Pages) Linear Technology – 60V Current Mode Synchronous Switching Regulator Controller

LTC3812-5
ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full operating
temperature range, otherwise specifications 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 specified.
SYMBOL
PARAMETER
Main Control Loop
INTV_CC
I_Q
I_BOOST
INTV_CC Supply Voltage
INTV_CC Supply Current
INTV_CC Shutdown Current
BOOST Supply Current
V_FB
Feedback Voltage
∆V_FB,LINE
V_SENSE(MAX)
Feedback Voltage Line Regulation
Maximum Current Sense Threshold
V_SENSE(MIN)
Minimum Current Sense Threshold
I_VFB
A_VOL(EA)
f_U
V_FCB
I_FCB
V_RUN/SS
I_RUN/SS
V_VCCUV
Oscillator
t_ON
t_ON(MIN)
t_OFF(MIN)
Driver
I_BG,PEAK
R_BG,SINK
I_TG,PEAK
R_TG,SINK
PGOOD Output
∆V_FBOV
∆V_FB,HYST
V_PGOOD
Feedback Current
Error Amplifier DC Open-Loop Gain
Error Amp Unity Gain Crossover
Frequency
FCB Threshold
FCB Current
Shutdown Threshold
RUN/SS Source Current
INTV_CC Undervoltage Lockout
Linear Regulator Mode
External Supply Mode
Trickle-Charge Mode
On-Time
Minimum On-Time
Minimum Off-Time
BG Driver Peak Source Current
BG Driver Pull-Down R_DS(ON)
TG Driver Peak Source Current
TG Driver Pull-Down R_DS(ON)
PGOOD Upper Threshold
PGOOD Lower Threshold
PGOOD Hysterisis
PGOOD Low Voltage
CONDITIONS
MIN TYP MAX UNITS
RUN/SS > 1.5V (Notes 4, 5)
RUN/SS = 0V
RUN/SS > 1.5V (Note 5)
RUN/SS = 0V
(Note 4)
0°C to 85°C
–40°C to 85°C
–40°C to 125°C
5V < INTV_CC < 14V (Note 4)
V_RNG = 2V, V_FB = 0.76V
V_RNG = 0V, V_FB = 0.76V
V_RNG = INTV_CC, V_FB = 0.76V
V_RNG = 2V, V_FB = 0.84V
V_RNG = 0V, V_FB = 0.84V
V_RNG = INTV_CC, V_FB = 0.84V
V_FB = 0.8V
(Note 6)
l 4.35
14
V
3
6
mA
224
600
μA
240
400
μA
0
5
μA
0.796 0.800 0.804
V
l 0.794 0.800 0.806
V
l 0.792 0.800 0.806
V
l 0.792 0.800 0.808
V
l
0.002 0.02
%/V
256
320
384
mV
70
95
120
mV
170
215
260
mV
–300
mV
–85
mV
–200
mV
20
150
nA
65
100
dB
25
MHz
V_FCB Rising
FCB = 5V
RUN/SS = 0V
0.75
0.8
0.85
V
0
1
μA
1.2
1.5
2
V
0.7
1.4
2.5
μA
INTV_CC Rising, I_NDRV = 100μA
l 4.05
4.2
4.35
V
INTV_CC Rising, NDRV = INTV_CC = EXTV_CC
l 4.05
4.2
4.35
V
INTV_CC Rising, NDRV = INTV_CC, EXTV_CC = 0 l 8.70
9.0
9.30
V
INTV_CC Falling
3.7
V
I_ON = 100μA
I_ON = 300μA
I_ON = 2500μA
1.55 1.85 2.15
μs
515
605
695
ns
100
ns
250
350
ns
V_BG = 0V
V_TG – V_SW = 0V
0.7
1
A
1
1.5
Ω
0.7
1
A
1
1.5
Ω
V_FB Rising
V_FB Falling
V_FB Returning
I_PGOOD = 5mA
7.5
10
12.5
%
–7.5 –10 –12.5
%
1.5
3
%
0.3
0.6
V
38125fc
3