LTC3830-1 Linear Technology, LTC3830-1 Datasheet - Page 3

• Manufacturer Part Number: LTC3830-1
• Description: High Power Step-Down Synchronous DC/DC Controllers for Low Voltage Operation
• Manufacturer: Linear Technology

Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to ground unless otherwise
specified.
Note 3: Supply current in normal operation is dominated by the current
needed to charge and discharge the external FET gates. This will vary with
the LTC3830 operating frequency, operating voltage and the external FETs
used.
Note 4: The open-loop DC gain and transconductance from the SENSE
and SENSE
respectively.
Note 5: Rise and fall times are measured using 10% and 90% levels. Duty
cycle and nonoverlap times are measured using 50% levels.
Note 6: Guaranteed by design, not subject to test.
range, otherwise specifications are at T
SYMBOL
I
I
f
V
V
V
A
g
I
I
V
V
I
I
I
R
R
t
t
DC
ELECTRICAL CHARACTERISTICS
VCC
PVCC
OSC
COMP
MAX
IN
SS
SSIL
r
NOV
m
SAWL
SAWH
COMPMAX
V
IH
IL
, t
f
SENSE
SENSEFB
OSC
MAX
f
/ I
FREQSET
–
pins to COMP pin will be (A
PARAMETER
Supply Current
PV
Internal Oscillator Frequency
V
V
Maximum V
Frequency Adjustment
Error Amplifier Open-Loop DC Gain
Error Amplifier Transconductance
Error Amplifier Output Sink/Source Current
I
I
SHDN Input High Voltage
SHDN Input Low Voltage
SHDN Input Current
Soft-Start Source Current
Maximum Soft-Start Sink Current
In Current Limit
SENSE Input Resistance
SENSE to FB Resistance
Driver Rise/Fall Time
Driver Nonoverlap Time
Maximum G1 Duty Cycle
MAX
MAX
COMP
COMP
CC
Sink Current
Sink Current Tempco
Supply Current
at Minimum Duty Cycle
at Maximum Duty Cycle
COMP
V
)(1.265/3.3) and (g
A
= 25 C. V
CC
m
, PV
)(1.265/3.3)
CC1
CONDITIONS
Figure 2, V
V
Figure 2, V
V
FREQSET Floating
V
Measured from FB to COMP,
SENSE
Measured from FB to COMP,
SENSE
V
(Note 10)
V
V
V
V
V
Figure 2, PV
Figure 2, PV
Figure 2, V
The
SHDN
SHDN
FB
IMAX
IMAX
SHDN
SS
IMAX
SS
, PV
+
= 0V, PV
= 0V, V
= V
= V
= V
= V
= 0V
= 0V
= V
CC2
+
+
CC
denotes specifications that apply over the full operating temperature
and SENSE
and SENSE
CC
CC
CC
CC
(Note 8), PV
SHDN
SHDN
FB
= 5V, unless otherwise noted. (Note 2)
IMAX
, V
CC1
CC1
CC1
(Note 6)
Note 7: PV
limit protection circuit to be active.
Note 8: The current limiting amplifier can sink but cannot source current.
Under normal (not current limited) operation, the output current will be
zero.
Note 9: The LTC3830E/LTC3830-1E are guaranteed to meet performance
specifications from 0 C to 70 C. Specifications over the –40 C to 85 C
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 10: The minimum and maximum limits for I
includes the intentional temperature coefficient of 3300ppm/ C. This
induced temperature coefficient counteracts the typical temperature
coefficient of the external power MOSFET on-resistance. This results in a
relatively flat current limit over temperature for the application.
= 0V (Note 5), PV
IFB
= PV
= PV
= V
= V
= 8V
= 0V, V
= 0V,
CC
CC
–
–
CC2
CC2
Floating, (Note 4)
Floating, (Note 4)
(Note 3)
CC1
IFB
CC1
= 5V (Note 5)
= 5V (Note 5)
= 8V
= V
must be higher than V
CC
CC1
= 8V
LTC3830/LTC3830-1
CC
MIN
160
520
2.4
46
–8
25
91
9
4
by at least 2.5V for the current
3300
2.85
29.2
TYP
–12
200
650
100
120
0.7
0.1
1.2
2.2
0.1
1.6
14
10
55
12
12
18
80
95
MAX
1
over temperature
MAX
250
780
–16
250
250
1.6
0.8
10
20
10
15
20
1
sn3830 3830fs
ppm/ C
kHz/ A
UNITS
3
mho
kHz
mA
mA
mA
k
k
dB
ns
ns
%
A
A
V
V
V
A
A
A
V
V
A
A