LTC3868-1 Linear Technology, LTC3868-1 Datasheet - Page 3

• Manufacturer Part Number: LTC3868-1
• Description: Low IQ Dual 2-Phase Synchronous Step-Down Controller
• Manufacturer: Linear Technology

elecTrical characTerisTics
SYMBOL
V
V
I
V
V
g
I
UVLO
V
I
I
DF
I
V
V
V
V
I
V
Gate Driver
TG1,2
BG1,2
temperature range, otherwise specifications are at T
FB1,2
Q
SENSE
SENSE
SS1,2
DSC1,2
m1,2
IN
FB1,2
REFLNREG
LOADREG
OVL
RUN1,2
RUN1,2
SS1,2
SS1,2
SENSE(MAX)
MAX
LA
LT
+
–
LT
On
Hyst RUN Pin Hysteresis
PARAMETER
Input Supply Operating Voltage Range
Regulated Feedback Voltage
Feedback Current
Reference Voltage Line Regulation
Output Voltage Load Regulation
Transconductance Amplifier g
Input DC Supply Current
Pulse-Skipping or Forced Continuous
Mode
(One Channel On)
Pulse-Skipping 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
RUN Pin On Threshold
SS Pin Latchoff Arming Threshold
SS Pin Latchoff Threshold
SS Discharge Current
Maximum Current Sense Threshold
Pull-Up On-Resistance
Pull-Down On-Resistance
Pull-Up On-Resistance
Pull-Down On-Resistance
+
–
Pin Current
Pins Current
m
CONDITIONS
(Note 4) I
(Note 4)
(Note 4) V
(Note4)
Measured in Servo Loop,
∆I
(Note4)
Measured in Servo Loop,
∆I
(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
V
Each Channel
Each Channel
V
V
In Dropout, FREQ = 0V
V
V
V
V
Short-Circuit Condition V
V
V
A
FB1
FB1
FB1,2
OUT1,2
OUT1,2
SS1,2
RUN1
SS1
SS1
SS1,2
FB1,2
TH
TH
= 25°C. V
= 0.83V (No Load)
= 0.83V (No Load)
Voltage = 1.2V to 0.7V
Voltage = 1.2V to 2V
, V
, V
CC
CC
, V
= 0.7V, V
= 0V
= 4.5V
Ramping Up
Ramping Down
SS2
SS2
< INTV
> INTV
The
RUN2
TH1,2
TH1,2
IN
Rising from 1V
Rising from 2V
= 4.5V to 24V
l
IN
Rising
Voltage = 1.2V
= 1.2V, Sink/Source = 5µA
FB1,2
CC
CC
denotes the specifications which apply over the full operating
FB1,2
FB1,2
SENSE1
= 12V, V
– 0.5V
+ 0.5V
, Relative to Regulated
= 0.83V (No Load)
= 0.83V (No Load)
–,
2
RUN1,2
– = 3.3V
FB1,2
= 0.5V
= 5V, EXTV
CC
= 0V unless otherwise noted.
l
l
l
l
l
l
0.788
1.21
MIN
3.6
0.7
1.9
1.3
98
43
4
7
7
www.DataSheet4U.com
LTC3868-1
0.002
–0.01
99.4
TYP
0.01
1.26
300
540
170
0.8
1.3
3.8
1.5
2.5
1.5
2.4
1.1
±5
10
50
10
50
2
2
8
4
1
2
0.812
MAX
0.02
–0.1
1.31
±50
450
250
700
4.2
0.1
1.4
2.1
1.7
24
25
13
13
57
±1
±1
4
UNITS
mmho
38681fb

%/V
mA
mA
mV
mV
nA
µA
µA
µA
µA
µA
µA
µA
µA
%
%
%
%
Ω
Ω
Ω
Ω
V
V
V
V
V
V
V