LTC3803 Datasheet, PDF (2/12 Pages) Linear Technology – Constant Frequency Current Mode Flyback DC/DC Controller in ThinSOT

LTC3803
ABSOLUTE MAXIMUM RATINGS
(Note 1)
V_CC to GND
Low Impedance Source .......................... – 0.3V to 8V
Current Fed ...................................... 25mA into V_CC*
NGATE Voltage ......................................... – 0.3V to V_CC
V_FB, I_TH/RUN Voltages ..............................– 0.3V to 3.5V
SENSE Voltage ........................................... – 0.3V to 1V
NGATE 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
*LTC3803 internal clamp circuit self regulates V_CC voltage to 9.5V.
PACKAGE/ORDER INFORMATION
TOP VIEW
I_TH/RUN 1
GND 2
V_FB 3
6 NGATE
5 V_CC
4 SENSE
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
T_JMAX = 150°C, θ_JA = 230°C/W
ORDER PART
NUMBER
LTC3803ES6
S6 PART
MARKING
LTACV
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS _{The q indicates specifications which apply over the full operating}
temperature range, otherwise specifications are at T_A = 25°C. V_CC = 8V, unless otherwise noted. (Note 2)
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
V_TURNON
V_TURNOFF
V_HYST
V_CLAMP1mA
V_CLAMP25mA
V_MARGIN
I_CC
V_ITHSHDN
I_ITHSTART
V_FB
V_CC Turn On Voltage
V_CC Turn Off Voltage
V_CC Hysteresis
V_CC Shunt Regulator Voltage
V_CC Shunt Regulator Voltage
V_CLAMP1mA – V_TURNON Margin
Input DC Supply Current
Normal Operation
Start-Up
Shutdown Threshold (at I_TH/RUN)
Start-Up Current Source
Regulated Feedback Voltage
g_m
∆V_O(LINE)
∆V_O(LOAD)
Error Amplifier Transconductance
Output Voltage Line Regulation
Output Voltage Load Regulation
I_FB
f_OSC
DC_ON(MIN)
DC_ON(MAX)
t_RISE
t_FALL
V_IMAX
I_SLMAX
t_SFST
V_FB Input Current
Oscillator Frequency
Minimum Switch On Duty Cycle
Maximum Switch On Duty Cycle
Gate Drive Rise Time
Gate Drive Fall Time
Peak Current Sense Voltage
Peak Slope Compensation Output Current
Soft-Start Time
V_TURNON – V_TURNOFF
I_CC = 1mA, V_ITH/RUN = 0V
I_CC = 25mA, V_ITH/RUN = 0V
(Note 4)
V_ITH/RUN = 1.3V
V_CC = V_TURNON – 100mV
V_CC = V_TURNON + 100mV
V_ITH/RUN = 0V
0°C ≤ T_A␣ ≤ 85°C (Note 5)
–40°C␣ ≤ T_A ≤ 85°CC (Note 5)
I_TH/RUN Pin Load = ±5µA (Note 5)
V_TURNOFF < V_CC < V_CLAMP (Note 5)
I_TH/RUN Sinking 5µA (Note 5)
I_TH/RUN Sourcing 5µA (Note 5)
(Note 5)
V_ITH/RUN = 1.3V
V_ITH/RUN = 1.3V, V_FB = 0.8V
V_ITH/RUN = 1.3V, V_FB = 0.8V
C_LOAD = 3000pF
C_LOAD = 3000pF
R_SL = 0 (Note 6)
(Note 7)
q 7.8
q 4.6
q 1.5
q 8.3
q 8.4
q 0.05
q
q 0.15
0.2
0.788
q 0.780
200
180
70
q 90
8.7
5.7
3.0
9.4
9.5
0.6
240
40
0.28
0.3
0.800
0.800
333
0.05
3
3
10
200
6
80
40
40
100
5
1.4
9.2
6.8
10.3
10.5
350
90
0.45
0.4
0.812
0.812
500
50
240
8
90
115
UNITS
V
V
V
V
V
V
µA
µA
V
µA
V
V
µA/V
mV/V
mV/µA
mV/µA
nA
kHz
%
%
ns
ns
mV
µA
ms
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3803E is guaranteed to meet 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 3: T_J is calculated from the ambient temperature T_A and power
dissipation P_D according to the following formula:
3803i
2