LTC3805EMSE-TRPBF datasheet(3/20 Pages) LINER

Part #	LTC3805EMSE-TRPBF

Description	Adjustable Frequency Current Mode Flyback DC/DC Controller

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Manufacturer	LINER [Linear Technology]

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LTC3805

3

3805fb

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The LTC3805E is guaranteed to meet speciﬁcations from 0°C to

85°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: TJ is calculated from the ambient temperature TA and power

dissipation PD according to the following formula:

TJ = TA + (PD • 45°C/W)

Note 4: Dynamic supply current is higher due to the gate charge being

delivered at the switching frequency.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

ICC

Input DC Supply Current

Normal Operation (fOSC = 200kHz)

(Note 4)

360

μA

VRUN < VRUNON or VCC < VTURNON – 100mV

(Micropower Start-Up)

●

40

90

μA

VRUNON

RUN Turn-On Voltage

VCC = VTURNON + 100mV

●

1.122

1.207

1.292

V

VRUNOFF

RUN Turn-Off Voltage

VCC = VTURNON + 100mV

●

1.092

1.170

1.248

V

IRUN(HYST)

RUN Hysteresis Current

●

4

5

5.8

μA

VFB

Regulated Feedback Voltage

0°C ≤ TA ≤ 85°C (Note 5)

–40°C ≤ TA ≤ 85°C (Note 5)

●

0.788

0.780

0.800

0.812

V

IFB

VFB Input Current

VITH = 1.3V (Note 5)

20

nA

gm

Error Ampliﬁer Transconductance

ITH Pin Load = ±5μA (Note 5)

333

μA/V

ΔVO(LINE)

Output Voltage Line Regulation

VTURNOFF < VCC < VCLAMP1mA (Note 5)

0.05

mV/V

ΔVO(LOAD)

Output Voltage Load Regulation

ITH Sinking 5μA (Note 5)

ITH Sourcing 5μA (Note 5)

3

mV/μA

fOSC

Oscillator Frequency

RFS = 350k

70

kHz

RFS = 36k

700

kHz

DCON(MIN)

Minimum Switch-On Duty Cycle

fOSC = 200kHz

6

9

%

DCON(MAX)

Maximum Switch-On Duty Cycle

fOSC = 200kHz

70

80

95

%

fSYNC

As a Function of fOSC

70kHz < fOSC < 700kHz,

70kHz < fSYNC < 700kHz

67

133

%

VSYNC

Minimum SYNC Amplitude

2.9

V

ISS

Soft-Start Current

–6

μA

IFTO

Fault Timeout Current

2μA

tSS(INT)

Internal Soft-Start Time

No External Capacitor on SSFLT

1.8

ms

tFTO(INT)

Internal Fault Timeout

No External Capacitor on SSFLT

4.5

ms

tRISE

Gate Drive Rise Time

CLOAD = 3000pF

30

ns

tFALL

Gate Drive Fall Time

CLOAD = 3000pF

30

ns

VI(MAX)

Peak Current Sense Voltage

RSL = 0 (Note 6)

●

85

100

115

mV

ISL(MAX)

Peak Slope Compensation Output

Current

(Note 7)

10

μA

VOCT

Overcurrent Threshold

ROC = 0 (Note 8)

●

85

100

115

mV

IOC

Overcurrent Threshold Adjust Current

10

μA

Note 5: The LTC3805 is tested in a feedback loop that servos VFB to the

output of the error ampliﬁer while maintaining ITH at the midpoint of the

current limit range.

Note 6: Peak current sense voltage is reduced dependent on duty cycle

and an optional external resistor in series with the SENSE pin. For

details, refer to Programmable Slope Compensation in the Applications

Information section.

Note 7: Guaranteed by design.

Note 8: Overcurrent threshold voltage is reduced dependent on an

optional external resistor in series with the OC pin. For details, refer to

Programmable Overcurrent in the Applications Information section.

ELECTRICAL CHARACTERISTICS The ● denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at TA = 25°C, VCC = 8V, unless otherwise noted (Note 2).

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