ltc3853euj Linear Technology Corporation, ltc3853euj Datasheet - Page 3

• Manufacturer Part Number: ltc3853euj
• Description: Triple Output, Multiphase Synchronous Step-down Controller
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
SYMBOL
Main Control Loops
V
I
V
V
g
I
UVLO
UVLO
V
I
I
V
V
V
DF
TG R
TG R
BG R
BG R
TG1,2,3 t
TG1,2,3 t
BG1,2,3 t
BG1,2,3 t
TG/BG t
BG/TG t
t
temperature range, otherwise specifi cations are at T
FB1,2,3
Q
SENSE
TK/SS1,2,3
ON(MIN)
FB1,2,3
REFLNREG
LOADREG
m1,2,3
OVL
RUN1,2,3
RUN1,2,3HYS
SENSE(MAX)
MAX
UP
DOWN
UP
DOWN
HYS
1D
2D
r
f
r
f
PARAMETER
Regulated Feedback Voltage
Feedback Current
Reference Voltage Line Regulation
Output Voltage Load Regulation
Transconductance Amplifi er g
Input DC Supply Current
Undervoltage Lockout on INTV
UVLO Hysteresis
Feedback Overvoltage Lockout
Sense Pin Current
Soft-Start Charge Current
RUN Pin ON Threshold
RUN Pin Hysteresis
Maximum Current Sense Threshold
Maximum Duty Factor
TG Driver Pull-Up On-Resistance
TG Driver Pull-Down On-Resistance
BG Driver Pull-Up On-Resistance
BG Driver Pull-Down On-Resistance
Top Gate Off to Bottom Gate On Delay
Synchronous Switch-On Delay Time
Bottom Gate Off to Top Gate On Delay
Top Switch-On Delay Time
Minimum On-Time
TG Transition Time:
BG Transition Time:
Rise Time
Fall Time
Normal Mode
Shutdown
Rise Time
Fall Time
m
CC
A
CONDITIONS
I
I
(Note 4)
V
(Note 4)
Measured in Servo Loop;
ΔI
Measured in Servo Loop;
ΔI
I
(Note 5)
V
V
V
Measured at V
V
V
V
I
I
I
In Dropout
TG High
TG Low
BG High
BG Low
(Note 6)
C
C
(Note 6)
C
C
(Note 6)
C
(Note 6)
C
(Note 7)
TH1,2,3
TH1,2,3
TH1,2,3
TH1,2,3
TH1,2,3
TH1,2,3
TK/SS1,2,3
IN
IN
RUN1,2,3
INTVCC
SENSE
RUN1
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
= 25°C, V
TH
TH
= 6V to 24V (Note 4)
= 15V
Voltage = 1.2V to 0.7V
Voltage = 1.2V to 1.6V
, V
= 3300pF
= 3300pF
= 3300pF
= 3300pF
= 3300pF Each Driver
= 3300pF Each Driver
The
Voltage = 1.2V (Note 4)
Voltage = 1.2V (0°C to 85°C) (Note 4)
= 1.2V, Sink/Source 5μA (Note 4)
= 3.3V
= 1.85V, V
= 1.85V, V
= 1.85V, V
Ramping Down
RUN2
= 0V
= 0V
l
IN
, V
FB1,2,3
denotes the specifi cations which apply over the full operating
= 15V, V
RUN3
SENSE1,2,3
SENSE1,2,3
SENSE1,2,3
Rising
RUN1,2,3
= 3.3V, I
= 3.3V, I
= 3.3V, I
= 5V, unless otherwise noted.
LIM
LIM
LIM
= 0V
= Float
= INTV
CC
l
l
l
l
l
l
l
l
0.792
0.794
MIN
0.84
0.9
1.1
22
42
65
97
0.800
0.800
0.002
–0.01
0.01
3.35
0.86
TYP
–10
2.2
4.1
0.5
1.3
1.2
2.6
1.5
2.4
1.1
42
±1
80
30
50
75
98
25
25
25
25
30
30
90
LTC3853
0.808
0.806
MAX
0.02
–0.1
0.88
1.35
–50
0.1
1.7
70
±2
38
58
85
UNITS
mmho
3
3853f
%/V
mA
mV
mV
mV
mV
nA
μA
μA
μA
ns
ns
ns
ns
ns
ns
ns
%
%
%
Ω
Ω
Ω
Ω
V
V
V
V
V
V