LTC3883 Datasheet, PDF (5/112 Pages) Linear Technology – Single Phase Step-Down DC/DC Controller with Digital Power System Management

LTC3883/LTC3883-1
Electrical Characteristics The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T_A = 25°C (Note 2). V_IN = 12V, V_RUN = 3.3V, f_SYNC = 500kHz (externally
driven) unless otherwise specified.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Input Voltage
V_IN
Input Voltage Range
I_Q
Input Voltage Supply Current
Normal Operation
V_UVLO
Undervoltage Lockout Threshold
when V_IN > 4.2V
Control Loop
(Note 12)
l 4.5
24
V
(Note 14)
V_RUN = 3.3V, No Caps on TG and BG
V_RUN = 0V
V_INTVCC/V_EXTVCC Falling
V_INTVCC/V_EXTVCC Rising
30
mA
20
mA
3.7
V
3.95
V
V_OUTR0
Full-Scale Voltage Range 0
Set Point Accuracy (0.6V to 5V)
Resolution
LSB Step Size
VOUT_COMMAND = 5.500V (Note 9)
l 5.422
5.576
V
l –0.5
0.5
%
12
Bits
1.375
mV
V_OUTR1
Full-Scale Voltage Range 1
Set Point Accuracy (0.6V to 2.5V)
Resolution
LSB Step Size
VOUT_COMMAND = 2.75V (Note 9)
l 2.711
2.788
V
l –0.5
0.5
%
12
Bits
0.6875
mV
V_LINEREG
V_LOADREG
g_m
I_ISENSE
V_SENSERIN
V_IlLIMIT
Line Regulation
Load Regulation
Error Amplifier g_m
Input Current
V_SENSE Input Resistance to Ground
Resolution
V_ILIMMAX
6V < V_IN < 24V
∆V_ITH = 1.35V – 0.7V
∆V_ITH = 1.35V – 2.0V
I_TH =1.22V
V_ISENSE = 5.5V
0V ≤ V_PIN ≤ 5.5V
Hi Range
Lo Range
l
l
l
l
l 68
l 44
0.01
–0.01
3
±1
47
3
75
50
±0.02
0.1
–0.1
±2
82
56
%/V
%
%
mmho
µA
kΩ
bits
mV
mV
V_ILIMMIN
Hi Range
Lo Range
37.5
mV
25
mV
Gate Driver
TG
TG Transition Time:
t_r
Rise Time
t_f
Fall Time
BG
BG Transition Time:
t_r
Rise Time
t_f
Fall Time
TG/BG t_1D Top Gate Off to Bottom Gate On Delay Time
BG/TG t_2D Bottom Gate Off to Top Gate On Delay Time
t_ON(MIN)
Minimum On-Time
OV/UV Output Voltage Supervisor
(Note 4)
C_LOAD = 3300pF
C_LOAD = 3300pF
(Note 4)
C_LOAD = 3300pF
C_LOAD = 3300pF
(Note 4) C_LOAD = 3300pF
(Note 4) C_LOAD = 3300pF
30
ns
30
ns
20
ns
20
ns
10
ns
30
ns
90
ns
N
Resolution
8
bits
V_RANGE0
Voltage Range
V_RANGE1
Voltage Range
V_OUSTP0
Step Size
V_OUSTP1
Step Size
V_THACC0
Threshold Accuracy 2V < V_OUT < 5V
V_THACC1
Threshold Accuracy 0.9V < V_OUT < 2.5V
t_PROPOV1
OV Comparator to GPIO Low Time
t_PROPUV1
UV Comparator to GPIO Low Time
V_IN Voltage Supervisor
N
Resolution
Range Value = 0
Range Value = 1
Range Value = 0
Range Value = 1
Range Value = 0
Range Value = 1
V_OD = 10% of Threshold
V_OD = 10% of Threshold
1
5.5
V
0.4
2.7
V
22
mV
11
mV
l
±2
%
l
±2
%
35
µs
35
µs
8
bits
3883f
5