ltc3608ewkg Linear Technology Corporation, ltc3608ewkg Datasheet - Page 3

• Manufacturer Part Number: ltc3608ewkg
• Description: 18v, 8a Monolithic Synchronous Step-down Dc/dc Converter
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
junction temperature range, otherwise specifi cations are at T
SYMBOL
Main Control Loop
SV
I
V
ΔV
ΔV
I
g
V
I
t
t
t
I
I
ΔV
V
V
V
I
I
V
V
R
Internal V
V
ΔV
V
ΔV
ΔV
PGOOD Output
ΔV
ΔV
ΔV
V
Q
FB
FCB
ON
ON(MIN)
OFF(MIN)
VALLEY(MAX)
VALLEY(MIN)
RUN/SS(C)
RUN/SS(D)
m(EA)
FB
FCB
RUN/SS(ON)
RUN/SS(LE)
RUN/SS(LT)
IN(UVLO)
IN(UVLOR)
INTVCC
EXTVCC
PGL
DS(ON)
IN
FB(LINEREG)
FB(LOADREG)
FB(OV)
LDO(LOADREG)
EXTVCC
EXTVCC(HYS)
FBH
FBL
FB(HYS)
CC
Regulator
PARAMETER
Operating Input Voltage Range
Input DC Supply Current
Feedback Reference Voltage
Feedback Voltage Line Regulation
Feedback Voltage Load Regulation
Feedback Input Current
Error Amplifi er Transconductance
Forced Continuous Threshold
Forced Continuous Pin Current
On-Time
Minimum On-Time
Minimum Off-Time
Maximum Valley Current
Maximum Reverse Valley Current
Output Overvoltage Fault Threshold
RUN Pin Start Threshold
RUN Pin Latchoff Enable Threshold
RUN Pin Latchoff Threshold
Soft-Start Charge Current
Soft-Start Discharge Current
Undervoltage Lockout
Undervoltage Lockout Release
Top Switch On-Resistance
Bottom Switch On-Resistance
Internal V
Internal V
EXTV
EXTV
EXTV
PGOOD Upper Threshold
PGOOD Lower Threshold
PGOOD Hysteresis
PGOOD Low Voltage
Normal
Shutdown Supply Current
CC
CC
CC
Switchover Voltage
Switch Drop Voltage
Switchover Hysteresis
CC
CC
Voltage
Load Regulation
CONDITIONS
I
I
V
I
V
I
V
I
I
I
I
V
V
V
V
RUN/SS Pin Rising
RUN/SS Pin Falling
V
V
INTV
INTV
6V < V
I
I
I
V
V
V
I
TH
TH
TH
TH
ON
ON
ON
ON
CC
CC
CC
PGOOD
IN
FB
FCB
RNG
RNG
RNG
RNG
RUN/SS
RUN/SS
FB
FB
FB
The
= 1.2V, –40°C to 85°C (Note 3)
= 1.2V, –40°C to 125°C (Note 3)
= 0.5V to 1.9V (Note 3)
= 1.2V (Note 3)
= 0mA to 20mA, V
= 20mA, V
= 20mA, V
= 60μA, V
= 60μA, V
= 180μA, V
= 30μA, V
= 4V to 18V, I
= 0.6V
Rising
Falling
Returning
CC
CC
= 0.6V
= 0.5V, V
= 0V, V
= 0.5V, V
= 0V, V
A
IN
= 5mA
Falling
Rising
= 25°C. V
l
= 0V
= 4.5V, V
< 18V, V
denotes the specifi cations which apply over the full operating
FB
FB
ON
ON
ON
EXTVCC
EXTVCC
FB
FB
ON
= 0.56V, FCB = 0V
= 0.64V, FCB = 0V
= 1.5V
= 0V
= 1.5V
TH
= 0.56V, FCB = 0V
= 0.64V, FCB = 0V
EXTVCC
FB
= 0V
IN
= 0V
= 1.2V (Note 3)
Rising
= 5V
= 15V unless otherwise noted.
EXTVCC
= 4V
= 4V
l
l
l
l
l
l
l
l
l
l
0.594
0.590
MIN
0.54
–0.5
220
1.4
3.5
5.5
0.8
0.8
4.7
4.5
–7
4
5
8
7
7
0.600
0.600
0.002
–0.05
–1.2
–0.1
0.15
TYP
900
280
110
320
150
500
–10
1.7
0.6
5.5
7.5
1.5
3.5
1.8
3.4
3.5
4.7
15
–5
–1
60
11
16
10
10
10
4
8
5
1
LTC3608
0.606
0.610
2000
MAX
–0.3
0.66
±50
340
100
500
300
–13
7.5
9.5
4.5
4.2
3.9
5.5
2.5
0.4
18
30
–2
13
–3
19
14
±2
13
2
2
3
4
UNITS
3608fa
3
%/V
mΩ
mΩ
mS
mV
mV
μA
μA
nA
μA
μA
μA
ns
ns
ns
ns
%
%
%
%
%
%
V
V
V
V
A
A
A
A
V
V
V
V
V
V
V
V