2
LTC3801/LTC3801B
sn3801 3801fs
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage Range ● 2.4 9.8 V
Input DC Supply Current Typicals at V
IN
= 4.2V (Note 4)
Normal Operation 2.4V ≤ V
IN
≤ 9.8V, V
ITH
/RUN = 1.3V 195 300 µA
SLEEP Mode 2.4V ≤ V
IN
≤ 9.8V (LTC3801 Only) 16 30 µA
Shutdown 2.4V ≤ V
IN
≤ 9.8V, V
ITH
/RUN = 0V (LTC3801) 6 15 µA
2.4V ≤ V
IN
≤ 9.8V, V
ITH
/RUN = 0V (LTC3801B) 8 17 µA
UVLO V
IN
< UVLO Threshold 1 2 µA
Undervoltage Lockout Threshold V
IN
Rising ● 1.8 2.3 V
V
IN
Falling ● 1.7 2.2 V
Start-Up Current Source V
ITH
/RUN = 0V (LTC3801) 0.5 1 1.5 µA
V
ITH
/RUN = 0V (LTC3801B) 1.0 2 3.0 µA
Shutdown Threshold (at I
TH
/RUN) V
ITH
/RUN Rising ● 0.3 0.6 0.95 V
Regulated Feedback Voltage 0°C ≤ T
A
≤ 85°C (Note 5) 0.788 0.800 0.812 V
–40°C ≤ T
A
≤ 85°C (Note 5) ● 0.780 0.800 0.812 V
Feedback Voltage Line Regulation 2.4V ≤ V
IN
≤ 9.8V (Note 5) 0.05 mV/V
Feedback Voltage Load Regulation I
TH
/RUN Sinking 5µA (Note 5) 2 mV/µA
I
TH
/RUN Sourcing 5µA (Note 5) 2 mV/µA
V
FB
Input Current (Note 5) 2 10 nA
Overvoltage Protect Threshold Measured at V
FB
0.850 0.880 0.910 V
Overvoltage Protect Hysteresis 40 mV
Oscillator Frequency
Normal Operation V
FB
= 0.8V 500 550 650 kHz
Output Short Circuit V
FB
= 0V 210 kHz
Gate Drive Rise Time C
LOAD
= 3000pF 40 ns
Gate Drive Fall Time C
LOAD
= 3000pF 40 ns
Peak Current Sense Voltage Duty Cycle < 40% (Note 6)
LTC3801 ● 109 117 125 mV
LTC3801B ● 95 104 113 mV
Peak Current Sense Voltage in Burst Mode Operation LTC3801 Only 26 mV
Default Soft-Start Time 0.6 ms
ORDER PART
NUMBER
(Note 1)
Input Supply Voltage (V
IN
)........................ –0.3V to 10V
SENSE
–
, PGATE Voltages ............ –0.3V to (V
IN
+ 0.3V)
V
FB
, I
TH
/RUN Voltages ............................. –0.3V to 2.4V
PGATE Peak Output Current (<10µs) ........................ 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
LTC3801ES6
LTC3801BES6
T
JMAX
= 150°C, θ
JA
= 230°C/W
The ● indicates specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 4.2V unless otherwise noted. (Note 2)
ABSOLUTE MAXIMUM RATINGS
W
WW
U
PACKAGE/ORDER INFORMATION
W
U
U
Consult LTC Marketing for parts specified with wider operating temperature ranges.
I
TH
/RUN 1
GND 2
V
FB
3
6 PGATE
5 V
IN
4 SENSE
–
TOP VIEW
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
S6 PART MARKING
LTACR
LTAHN
ELECTRICAL CHARACTERISTICS
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
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formula:
T
J
= T
A
+ (P
D
• θ
JA
°C/W)
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
FB
to the output of the error amplifier while maintaining I
TH
/RUN at the
midpoint of the current limit range.
Note 6: Peak current sense voltage is reduced dependent on duty cycle as
given in Figure 1.
