LTC3803-5 Datasheet, PDF (2/12 Pages) Linear Technology – Constant Frequency Current Mode Flyback DC/DC Controller in ThinSOT

LTC3803-5
ABSOLUTE MAXIMUM RATINGS
(Note 1)
V_CC to GND (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 Junction Temperature Range (Note 2)
LTC3803E-5 ....................................... – 40°C to 85°C
LTC3803H-5 (Note 3) ....................... – 40°C to 150°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
*LTC3803-5 internal clamp circuit self regulates V_CC voltage to 8V.
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 = 165°C/W
ORDER PART
NUMBER
LTC3803HS6-5
LTC3803ES6-5
S6 PART
MARKING
LTBMH
LTBPF
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS LTC3803E-5: The ● indicates specifications which apply over the full –40°C
to 85°C operating junction temperature range, otherwise specifications are at T_J = 25°C. V_CC = 5V, unless otherwise noted. (Note 2)
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
V_TURNON
V_TURNOFF
V_CC Turn On Voltage
V_CC Turn Off Voltage
●4
4.8
5.7
V
● 3.3
4
4.9
V
V_HYST
V_CLAMP1mA
V_CLAMP25mA
I_CC
V_ITHSHDN
I_ITHSTART
V_CC Hysteresis
V_CC Shunt Regulator Voltage
V_CC Shunt Regulator Voltage
Input DC Supply Current
Normal Operation
Undervoltage
Shutdown Threshold (at I_TH/RUN)
Start-Up Current Source
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
● 0.05
0.8
V
● 6.2
8
9.9
V
● 6.3
8.1
10.3
V
240
350
µA
●
40
90
µA
● 0.12
0.28
0.45
V
● 0.07
0.34
0.8
µA
V_FB
Regulated Feedback Voltage
g_m
Error Amplifier Transconductance
0°C ≤ T_J ≤ 85°C (Note 5)
–40°C ≤ T_J ≤ 85°C (Note 5)
I_TH/RUN Pin Load = ±5µA (Note 5)
0.788
● 0.780
200
0.800
0.800
333
0.812
V
0.816
V
500
µA/V
∆V_O(LINE)
∆V_O(LOAD)
I_FB
Output Voltage Line Regulation
Output Voltage Load Regulation
V_FB Input Current
V_TURNOFF < V_CC < V_CLAMP (Note 5)
I_TH/RUN Sinking 5µA (Note 5)
I_TH/RUN Sourcing 5µA (Note 5)
(Note 5)
0.1
mV/V
3
mV/µA
3
mV/µA
10
50
nA
f_OSC
DC_ON(MIN)
DC_ON(MAX)
t_RISE
t_FALL
V_IMAX
I_SLMAX
t_SFST
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_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)
170
200
230
kHz
6.5
8.5
%
70
80
90
%
40
ns
40
ns
● 90
100
115
mV
5
µA
0.7
ms
38035f
2