ltc3890 Linear Technology Corporation, ltc3890 Datasheet - Page 3

• Manufacturer Part Number: ltc3890
• Description: 60v Low Iq, Dual, 2-phase Synchronous Step-down Dc/dc Controller
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
SYMBOL
V
g
I
UVLO
V
I
I
DF
I
V
V
V
V
Gate Driver
TG1,2
BG1,2
TG1,2 t
TG1,2 t
BG1,2 t
BG1,2 t
TG/BG t
BG/TG t
t
junction temperature range, otherwise specifi cations are at T
Q
SENSE
SENSE
TRACK/SS1,2
ON(MIN)
m1,2
LOADREG
OVL
RUN1
RUN2
RUN1,2
SENSE(MAX)
MAX
+
–
On
On
r
f
r
f
1D
1D
Hyst RUN Pin Hysteresis
PARAMETER
Output Voltage Load Regulation
Transconductance Amplifi er g
Input DC Supply Current
Pulse Skip or Forced Continuous Mode
(One Channel On)
Pulse Skip or Forced Continuous Mode
(Both Channels On)
Sleep Mode (One Channel On)
Sleep Mode (Both Channels On)
Shutdown
Undervoltage Lockout
Feedback Overvoltage Protection
SENSE
SENSE
Maximum Duty Factor
Soft-Start Charge Current
RUN1 Pin On Threshold
RUN2 Pin On Threshold
Maximum Current Sense Threshold
Pull-Up On-Resistance
Pull-Down On-Resistance
Pull-Up On-Resistance
Pull-Down On-Resistance
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
Rise Time
Fall Time
Rise Time
Fall Time
+
–
Pin Current
Pins Current
m
CONDITIONS
(Note4)
Measured in Servo Loop,
Δ
(Note4)
Measured in Servo Loop,
Δ
(Note 4) I
(Note 5)
RUN1 = 5V and RUN2 = 0V or
RUN1 = 0V and RUN2 = 5V,
V
RUN1,2 = 5V, V
RUN1 = 5V and RUN2 = 0V or
RUN1 = 0V and RUN2 = 5V,
V
RUN1,2 = 5V, V
RUN1,2 = 0V
INTV
INTV
Measured at V
Each Channel
Each Channel
V
V
In Dropout
V
V
V
V
V
V
(Note 6)
C
C
(Note 6)
C
C
C
C
(Note 7)
TRACK1,2
ITH
ITH
FB1
FB1
SENSE
SENSE
RUN1
RUN2
FB1,2
FB1,2
FB1,2
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
CC
CC
Voltage = 1.2V to 0.7V
Voltage = 1.2V to 2V
= 0.83V (No Load)
= 0.83V (No Load)
= 0.7V, V
= 0.7V, V
= 0.7V, V
= 3300pF
= 3300pF
= 3300pF
= 3300pF
= 3300pF Each Driver
= 3300pF Each Driver
Rising
Rising
–
–
Ramping Up
Ramping Down
< INTV
> INTV
TH1,2
= 0V
The
J
FB1,2
= 25°C. V
= 1.2V, Sink/Source = 5μA
FB1,2
FB1,2
CC
CC
SENSE1
SENSE1
SENSE1
l
denotes the specifi cations which apply over the full operating
– 0.5V
+ 0.5V
, Relative to Regulated V
= 0.83V (No Load)
= 0.83V (No Load)
–,
–,
–,
2
2
2
– = 3.3V, I
– = 3.3V, I
– = 3.3V, I
IN
= 12V, V
LIM
LIM
LIM
RUN1,2
= 0
= INTV
= FLOAT
FB1,2
CC
= 5V, EXTV
l
l
l
l
l
l
l
l
l
CC
1.15
1.20
MIN
3.6
0.7
98
22
43
64
= 0V unless otherwise noted.
7
–0.01
0.01
1.21
1.25
TYP
700
1.3
4.0
3.8
1.0
2.5
1.5
2.4
1.1
50
60
14
10
99
50
30
50
75
25
16
28
13
30
30
95
2
2
LTC3890
MAX
–0.1
1.27
1.30
100
0.1
4.2
4.0
1.4
75
25
13
±1
±1
36
57
85
UNITS
mmho
3
3890f
mA
mA
mV
mV
mV
mV
μA
μA
μA
μA
μA
μA
μA
ns
ns
ns
ns
ns
ns
ns
%
%
%
%
Ω
Ω
Ω
Ω
V
V
V
V