English
Language : 

LTC3805-5_15 Datasheet, PDF (3/20 Pages) Linear Technology – Adjustable Frequency Current Mode Flyback/ Boost/SEPIC DC/DC Controller
◁
LTC3805-5
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C, VCC = 5V, unless otherwise noted (Note 2).
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VTURNON
VTURNOFF
VHYST
VCLAMP1mA
VCLAMP25mA
ICC
VCC Turn-On Voltage
VCC Turn-Off Voltage
VCC Hysteresis
VCC Shunt Regulator Voltage
VCC Shunt Regulator Voltage
Input DC Supply Current
VCC Rising
VCC Falling
ICC = 1mA, VRUN = 0
ICC = 25mA, VRUN = 0
Normal Operation (fOSC = 200kHz)
(Note 4)
l 4.3
4.5
4.7
V
l 3.75 3.95 4.15
V
0.55
V
l 8.8
9.25 9.65
V
l 8.9
9.5
9.9
V
360
µA
VRUN < VRUNON or VCC < VTURNON – 100mV l
(Micropower Start-Up)
40
90
µA
VRUNON
VRUNOFF
IRUN(HYST)
VFB
RUN Turn-On Voltage
RUN Turn-Off Voltage
RUN Hysteresis Current
Regulated Feedback Voltage
VCC = VTURNON + 100mV
VCC = VTURNON + 100mV
l 1.122 1.207 1.292
V
l 1.092 1.170 1.248
V
l4
5
5.8
µA
0°C ≤ TJ ≤ 85°C (E-Grade) (Note 5)
0.788 0.800 0.812
V
–40°C ≤ TJ ≤ 85°C (E-Grade) (Note 5)
l 0.780 0.800 0.812
V
–40°C ≤ TJ ≤ 125°C (I-Grade) (Note 5)
l 0.780 0.800 0.812
V
–40°C ≤ TJ ≤ 150°C (H-Grade) (Note 5)
l 0.770 0.800 0.820
V
–55°C ≤ TJ ≤ 150°C (MP-Grade)
l 0.770 0.800 0.820
V
IFB
gm
DVO(LINE)
DVO(LOAD)
fOSC
VFB Input Current
Error Amplifier Transconductance
Output Voltage Line Regulation
Output Voltage Load Regulation
Oscillator Frequency
DCON(MIN)
DCON(MAX)
fSYNC
VSYNC
ISS
IFTO
tSS(INT)
tFTO(INT)
tRISE
tFALL
VI(MAX)
ISL(MAX)
VOCT
IOC
Minimum Switch-On Duty Cycle
Maximum Switch-On Duty Cycle
As a Function of fOSC
Minimum SYNC Amplitude
Soft-Start Current
Fault Timeout Current
Internal Soft-Start Time
Internal Fault Timeout
Gate Drive Rise Time
Gate Drive Fall Time
Peak Current Sense Voltage
Peak Slope Compensation Output Current
Overcurrent Threshold
Overcurrent Threshold Adjust Current
VITH = 1.3V (Note 5)
ITH Pin Load = ±5µA (Note 5)
VTURNOFF < VCC < VCLAMP1mA (Note 5)
ITH Sinking 5µA (Note 5)
ITH Sourcing 5µA (Note 5)
RFS = 350k
RFS = 36k
fOSC = 200kHz
fOSC = 200kHz
70kHz < fOSC < 700kHz,
70kHz < fSYNC < 700kHz
No External Capacitor on SSFLT
No External Capacitor on SSFLT
CLOAD = 3000pF
CLOAD = 3000pF
RSL = 0 (Note 6)
(Note 7)
ROC = 0 (Note 8)
70
67
l 85
l 85
20
nA
333
µA/V
0.05
mV/V
3
mV/µA
3
mV/µA
70
kHz
700
kHz
6
9
%
80
95
%
133
%
2.9
V
–6
µA
2
µA
1.8
ms
4.5
ms
30
ns
30
ns
100
115
mV
10
µA
100
115
mV
10
µA
38055fe
3
 ▷