ltc3869gn-2 Linear Technology Corporation, ltc3869gn-2 Datasheet - Page 3

• Manufacturer Part Number: ltc3869gn-2
• Description: Ltc3869/ltc3869-2 - Dual, 2-phase Synchronous Step-down Dc/dc Controllers
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
SYMBOL
Main Control Loops
V
V
V
I
V
V
g
I
DF
UVLO
UVLO
V
I
I
V
V
V
V
TG1, 2 t
TG1, 2 t
BG1, 2 t
BG1, 2 t
TG/BG t
BG/TG t
t
junction temperature range, otherwise specifications are at T
FB1,2
Q
SENSE
TK/SS1,2
ON(MIN)
m1,2
IN
OUT
FB1,2
REFLNREG
LOADREG
OVL
RUN1,2
RUN1,2(HYS)
SENSE(MAX)
MISMATCH
MAX
HYS
1D
2D
r
f
r
f
PARAMETER
Input Voltage Range
Output Voltage Range
Regulated Feedback Voltage
(Notes 2, 4)
Feedback Current
Reference Voltage Line Regulation
Output Voltage Load Regulation
Transconductance Amplifier g
Input DC Supply Current
Maximum Duty Factor
Undervoltage Lockout
UVLO Hysteresis
Feedback Overvoltage Lockout
Sense Pins Bias Current
Soft-Start Charge Current
RUN Pin On Threshold
RUN Pin On Hysteresis
Maximum Current Sense Threshold,
0°C to 85°C (Note 2)
Maximum Current Sense Threshold,
–40°C to 125°C (Note 2)
Channel to Channel Current Sense
Mismatch Voltage of V
TG Transition Time:
BG Transition Time:
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
Normal Mode
Shutdown
Rise Time
Fall Time
Rise Time
Fall Time
SENSE(MAX)
m
CONDITIONS
I
I
(Note 4)
V
(Note 4)
Measured in Servo Loop; ∆I
Measured in Servo Loop; ∆I
I
(Note 5)
V
V
In Dropout
V
Measured at V
(Each Channel); V
V
V
V
V
V
V
V
V
V
I
(Note 8)
C
C
(Note 8)
C
C
C
C
(Note 7)
TH1,2
TH1,2
TH1,2
LIM
IN
IN
RUN1,2
INTVCC
TK/SS1,2
RUN1
FB1,2
FB1,2
FB1,2
FB1,2
FB1,2
FB1,2
FB1,2
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
= 15V
= 4.0V to 38V (Note 4)
= Float
Voltage = 1.2V, 0°C to 85°C
Voltage = 1.2V, –40°C to 125°C
= 1.2V; Sink/Source 5µA; (Note 4)
, V
= 0.5V, V
= 0.5V, V
= 0.5V, V
= 0.5V, V
= 0.5V, V
= 0.5V, V
= 0.5V, V
= 3300pF
= 3300pF
= 3300pF
= 3300pF
= 3300pF Each Driver (Note 6)
= 3300pF Each Driver (Note 6)
= 0V
Ramping Down
RUN2
= 0V
The
Rising
FB1,2
SENSE1,2
SENSE1,2
SENSE1,2
SENSE1,2
SENSE1,2
SENSE1,2
SENSE1,2
A
SENSE1,2
= 25°C (Note 2). V
l
denotes the specifications which apply over the full operating
= 3.3V, I
= 3.3V, I
= 3.3V, I
= 3.3V, I
= 3.3V, I
= 3.3V, I
= 3.3V, LTC3869IGN-2
= 3.3V
TH
TH
Voltage = 1.2V to 0.7V
Voltage = 1.2V to 1.6V
LIM
LIM
LIM
LIM
LIM
LIM
= 0V
= Float
= INTV
= 0V
= Float
= INTV
IN
= 15V, V
CC
CC
LTC3869/LTC3869-2
RUN1,2
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
= 5V unless otherwise noted.
0.5955
0.5940
0.64
MIN
0.6
3.0
1.0
1.1
94
25
45
68
23
43
68
40
4
0.600
0.600
0.002
–0.01
0.01
0.66
1.25
1.22
TYP
–15
3.2
0.6
30
95
±1
80
30
50
75
30
50
75
50
25
25
25
25
30
30
90
2
3
0.6045
0.6060
MAX
12.5
0.01
–0.1
0.68
1.35
–50
0.1
3.4
1.5
38
50
±2
35
55
82
37
57
82
60
2
UNITS
mmho
3
3869f
%/V
mA
mV
mV
mV
mV
mV
mV
mV
mV
mV
nA
µA
µA
µA
ns
ns
ns
ns
ns
ns
ns
%
%
%
V
V
V
V
V
V
V
V