ltc3850gn-2 Linear Technology Corporation, ltc3850gn-2 Datasheet - Page 3

• Manufacturer Part Number: ltc3850gn-2
• Description: Dual, 2-phase Synchronous Step-down Switching Controller
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
SYMBOL
Main Control Loops
V
I
V
V
g
I
UVLO
UVLO
DF
V
I
I
V
V
V
TG R
TG R
BG R
BG R
TG1,2 t
TG1,2 t
BG1,2 t
BG1,2 t
TG/BG t
BG/TG t
t
INTV
V
V
V
V
V
FB1,2
Q
SENSE
TK/SS1,2
ON(MIN)
m1,2
FB1,2
REFLNREG
LOADREG
OVL
RUN1,2
RUN1,2HYS
SENSE(MAX)
INTVCC
LDO
EXTVCC
LDO
LDOHYS
MAX
UP
DOWN
CC
UP
DOWN
INT
EXT
HYS
r
f
r
f
Linear Regulator
1D
2D
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
Maximum Duty Factor
Feedback Overvoltage Lockout
Sense Pin Bias Current
Soft-Start Charge Current
RUN Pin ON Threshold
RUN Pin ON Hysteresis
Maximum Current Sense Threshold
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
Internal V
INTV
EXTV
EXTV
EXTV
TG Driver Pull-Up On-Resistance
TG Driver Pulldown On-Resistance
BG Driver Pull-Up On-Resistance
BG Driver Pulldown On-Resistance
TG Transition Time:
BG Transition Time:
Rise Time
Fall Time
Normal Mode
Shutdown
Rise Time
Fall Time
CC
CC
CC
CC
Load Regulation
Switchover Voltage
Voltage Drop
Hysteresis
CC
Voltage
m
CC
CONDITIONS
I
(Note 4)
V
(Note 4)
Measured in Servo Loop; ΔI
Measured in Servo Loop; ΔI
I
(Note 5)
V
V
V
In Dropout
Measured at V
(Each Channel) V
V
V
V
TG High
TG Low
BG High
BG Low
(Note 6)
C
C
(Note 6)
C
C
C
C
(Note 7)
7V < V
I
EXTV
I
TH1,2
TH1,2
CC
CC
IN
IN
RUN1,2
INTVCC
TK/SS1,2
RUN1
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
FB1,2
A
= 0mA to 50mA
= 20mA, V
= 6V to 24V (Note 4)
= 15V; EXTV
= 25°C, V
CC
Voltage = 1.2V; (Note 4)
= 1.2V; Sink/Source 5μA; (Note 4)
, V
= 3300pF
= 3300pF
= 3300pF
= 3300pF
= 3300pF Each Driver
= 3300pF Each Driver
IN
= 0.7V, V
Ramping Down
Ramping Positive
= 0V
RUN2
< 24V
= 0V
The
Rising
EXTVCC
FB1,2
l
IN
SENSE1,2
CC
SENSE1,2
denotes the specifi cations which apply over the full operating
= 15V, V
Tied to V
= 5V
= 3.3V
= 3.3V
TH
TH
RUN1,2
OUT1
Voltage = 1.2V to 0.7V
Voltage = 1.2V to 1.6V
; V
OUT1
= 5V, unless otherwise noted.
= 5V
l
l
l
l
l
l
l
0.792
MIN
0.84
0.9
1.1
4.8
4.5
96
40
0.800
0.002
–0.01
LTC3850-2
0.01
97.2
0.86
1.22
TYP
–10
850
200
2.2
0.5
1.3
2.6
1.5
2.4
1.1
0.5
4.7
30
±1
80
50
25
25
25
25
30
30
90
50
3
5
0.808
MAX
0.02
–0.1
0.88
1.35
–50
100
0.1
1.7
5.2
50
±2
60
2
UNITS
mmho
38502f
3
%/V
mV
mV
mV
mV
nA
μA
μA
μA
μA
ns
ns
ns
ns
ns
ns
ns
%
%
%
%
Ω
Ω
Ω
Ω
V
V
V
V
V
V
V