LTC3801 LINER [Linear Technology], LTC3801 Datasheet - Page 2

• Manufacturer Part Number: LTC3801
• Description: Micropower Constant Frequency Step-Down DC/DC Controllers in ThinSOT
• Manufacturer: LINER [Linear Technology]

ABSOLUTE
ELECTRICAL CHARACTERISTICS
LTC3801/LTC3801B
(Note 1)
Input Supply Voltage (V
SENSE
V
PGATE Peak Output Current (<10 s) ........................ 1A
Operating Temperature Range (Note 2) .. – 40 C to 85 C
Junction Temperature (Note 3) ............................ 150 C
Storage Temperature Range ................. – 65 C to 150 C
Lead Temperature (Soldering, 10 sec).................. 300 C
temperature range, otherwise specifications are at T
PARAMETER
Input Voltage Range
Input DC Supply Current
Undervoltage Lockout Threshold
Start-Up Current Source
Shutdown Threshold (at I
Regulated Feedback Voltage
Feedback Voltage Line Regulation
Feedback Voltage Load Regulation
V
Overvoltage Protect Threshold
Overvoltage Protect Hysteresis
Oscillator Frequency
Gate Drive Rise Time
Gate Drive Fall Time
Peak Current Sense Voltage
Peak Current Sense Voltage in Burst Mode Operation
Default Soft-Start Time
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3801ES6/LTC3801BES6 are guaranteed to meet specifica-
tions 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 3: T
dissipation P
2
FB
Normal Operation
SLEEP Mode
Shutdown
UVLO
Normal Operation
Output Short Circuit
FB
Input Current
, I
TH
J
–
/RUN Voltages ............................. – 0.3V to 2.4V
, PGATE Voltages ............ – 0.3V to (V
is calculated from the ambient temperature T
D
according to the following formula:
W
MAXIMUM
TH
/RUN)
IN
)........................ – 0.3V to 10V
W W
RATINGS
A
and power
U
CONDITIONS
Typicals at V
2.4V V
2.4V V
2.4V V
2.4V V
V
V
V
V
V
V
0 C T
–40 C T
2.4V V
I
I
(Note 5)
Measured at V
V
V
C
C
Duty Cycle < 40% (Note 6)
LTC3801
LTC3801B
LTC3801 Only
TH
TH
IN
IN
IN
ITH
ITH
ITH
FB
FB
LOAD
LOAD
A
/RUN Sinking 5 A (Note 5)
/RUN Sourcing 5 A (Note 5)
IN
= 25 C. V
< UVLO Threshold
Rising
Falling
= 0.8V
= 0V
/RUN = 0V (LTC3801)
/RUN = 0V (LTC3801B)
/RUN Rising
+ 0.3V)
= 3000pF
= 3000pF
A
IN
IN
IN
IN
IN
The
A
85 C (Note 5)
IN
9.8V (LTC3801 Only)
9.8V (Note 5)
9.8V, V
9.8V, V
9.8V, V
85 C (Note 5)
FB
IN
= 4.2V (Note 4)
indicates specifications which apply over the full operating
= 4.2V unless otherwise noted. (Note 2)
ITH
ITH
ITH
PACKAGE/ORDER
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 5: The LTC3801/LTC3801B are tested in a feedback loop that servos
V
midpoint of the current limit range.
Note 6: Peak current sense voltage is reduced dependent on duty cycle as
given in Figure 1.
FB
/RUN = 1.3V
/RUN = 0V (LTC3801)
/RUN = 0V (LTC3801B)
T
to the output of the error amplifier while maintaining I
J
I
= T
TH
/RUN 1
GND 2
A
V
T
FB
+ (P
JMAX
6-LEAD PLASTIC TSOT-23
3
D
= 150 C,
S6 PACKAGE
•
TOP VIEW
JA
C/W)
JA
= 230 C/W
6 PGATE
5 V
4 SENSE
IN
0.788
0.780
0.850
MIN
500
109
2.4
0.5
1.0
0.3
95
–
INFORMATION
U
0.800
0.800
0.880
0.05
TYP
195
550
210
117
104
1.8
1.7
0.6
0.6
16
40
40
40
26
S6 PART MARKING
6
8
1
1
2
2
2
2
LTC3801ES6
LTC3801BES6
ORDER PART
W
NUMBER
LTAHN
LTACR
0.812
0.812
0.910
MAX
0.95
300
650
125
113
9.8
2.3
2.2
1.5
3.0
30
15
17
10
TH
2
/RUN at the
mV/ A
mV/ A
UNITS
U
mV/V
3801f
kHz
kHz
mV
mV
mV
mV
ms
nA
ns
ns
V
A
A
A
A
A
V
V
A
A
V
V
V
V