LTC3858-1 Linear Technology Corporation, LTC3858-1 Datasheet - Page 3

• Manufacturer Part Number: LTC3858-1
• Description: Dual 2-Phase Synchronous Step-Down Controller
• Manufacturer: Linear Technology Corporation

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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 specifi cations 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 Voltage
PARAMETER
Input Supply Operating Voltage Range
Regulated Feedback Voltage
Feedback Current
Reference Voltage Line Regulation
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
RUN Pin On Threshold Voltage
SS Pin Latch-Off Arming Threshold
Voltage
SS Pin Latch-Off Threshold Voltage
SS Discharge Current
Maximum Current Sense Threshold
Voltage
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,
ΔI
(Note4)
Measured in Servo Loop,
ΔI
(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
Soft-Start Condition V
V
V
A
FB1
FB1
OUT1,2
OUT1,2
SS1,2
RUN1
SS1
SS1
SS1,2
FB1,2
–40°C to 85°C (LTC3858E-1)
–40°C to 125°C (LTC3858I-1)
–40°C to 85°C (LTC3858I-1)
TH
TH
= 25°C. V
, V
, V
CC
CC
Voltage = 1.2V to 0.7V
Voltage = 1.2V to 2V
= 0.83V (No Load)
= 0.83V (No Load)
, V
= 0.7V, V
= 0V
= 4.5V
SS2
SS2
Ramping Up
Ramping Down
< INTV
> INTVCC + 0.5
The
RUN2
TH1,2
TH1,2
IN
Rising from 1V
Rising from 2V
= 4.5V to 38V
l
IN
Rising
FB1,2
CC
= 1.2V
= 1.2V, Sink/Source = 5μA
FB1,2
FB1,2
SENSE1
denotes the specifi cations which apply over the full operating
= 12V, V
– 0.5
, Relative to Regulated V
= 0.83V (No Load)
= 0.83V (No Load)
–,
OSENSE1,2
2
– = 3.3V
RUN1,2
= 0.5V
= 5V, EXTV
FB1,2
CC
= 0V unless otherwise noted.
l
l
l
l
l
l
l
l
0.792
0.788
0.792
1.23
MIN
3.6
0.7
1.9
1.3
98
43
4
7
7
LTC3858-1
0.800
0.800
0.800
0.002
–0.01
0.01
99.4
1.28
TYP
170
300
540
1.3
4.0
3.8
1.0
1.5
2.5
1.5
2.4
1.1
±5
10
50
10
50
2
2
8
2
0.808
0.812
0.808
MAX
0.02
–0.1
1.33
±50
250
450
700
0.1
4.2
4.0
1.4
2.1
1.7
38
20
13
±1
±1
13
57
UNITS
mmho
38581f
3
%/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
V
V