LT1071HVMK datasheet(3/12 Pages) LINER

Part #	LT1071HVMK

Description	5A and 2.5A High Efficiency Switching Regulators

Download	12 Pages

Scroll/Zoom	100%

Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

Logo

3 / 12 page

3

LT1070/LT1071

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VFB

Flyback Reference Voltage

IFB = 50µA

15

16.3

17.6

V

q

14

18.0

V

Change in Flyback Reference Voltage

0.05

≤ IFB ≤ 1mA

4.5

6.8

8.5

V

Flyback Reference Voltage Line Regulation

IFB = 50µA, 3V ≤ VIN ≤ VMAX (Note 3)

0.01

0.03

%/V

Flyback Amplifier Transconductance (gm)

∆IC = ±10µA

150

300

650

µmho

Flyback Amplifier Source and Sink Current

VC = 0.6V, IFB = 50µA (Source)

q

15

32

70

µA

VC = 0.6V, IFB = 50µA (Sink)

q

25

40

70

µA

BV

Output Switch Breakdown Voltage

3V

≤ VIN ≤ VMAX, ISW = 1.5mA

(LT1070/LT1071)

q

65

90

V

(LT1070HV/LT1071HV)

q

75

90

V

VSAT

Output Switch “On” Resistance (Note 4)

LT1070

q

0.15

0.24

Ω

LT1071

q

0.30

0.50

Ω

Control Voltage to Switch Current

LT1070

8

A/V

Transconductance

LT1071

4

A/V

ILIM

Switch Current Limit (LT1070)

Duty Cycle

≤ 50%, TJ ≥ 25°C

q

510

A

Duty Cycle

≤ 50%, TJ < 25°C

q

511

A

Duty Cycle = 80% (Note 5)

q

410

A

Switch Current Limit (LT1071)

Duty Cycle

≤ 50%, TJ ≥ 25°C

q

2.5

5.0

A

Duty Cycle

≤ 50%, TJ < 25°C

q

2.5

5.5

A

Duty Cycle = 80% (Note 5)

q

2.0

5.0

A

∆IIN

Supply Current Increase During

25

35

mA/A

∆ISW

Switch “On” Time

f

Switching Frequency

35

40

45

kHz

q

33

47

kHz

DC (Max)

Maximum Switch Duty Cycle

90

92

97

%

Flyback Sense Delay Time

1.5

µs

Shutdown Mode Supply Current

3V

≤ VIN ≤ VMAX, VC = 0.05V

100

250

µA

Shutdown Mode Threshold Voltage

3V

≤ VIN ≤ VMAX

100

150

250

mV

q

50

300

mV

VIN = 15V, VC = 0.5V, VFB = VREF, output pin open unless otherwise specified.

The q denotes the specifications which apply over the full operating

temperature range.

Note 1: Absolute Maximum Ratings are those values beyond which the life of

a device may be impaired.

Note 2: Minimum switch “on” time for the LT1070/LT1071 in current limit is

≈1µs. This limits the maximum input voltage during short-circuit conditions,

in the buck and inverting modes only, to

≈35V.Normal(unshorted)conditions

are not affected. Mask changes are being implemented which will reduce

minimum “on” time to

≤1µs, increasing maximum short-circuit input voltage

above 40V. If the present LT1070/LT1071 (contact factory for package date

code) is being operated in the buck or inverting mode at high input voltages

and short-circuit conditions are expected, a resistor must be placed in series

with the inductor, as follows:

The value of the resistor is given by:

R =

– RL

t • f • VIN – VF

ILIMIT

t = Minimum “on” time of LT1070/LT1071 in current limit,

≈1µs

f = Operating frequency (40kHz)

VF = Forward voltage of external catch diode at ILIMIT

ILIMIT = Current limit of LT1070 (≈8A), LT1071 (≈ 4A)

RL = Internal series resistance of inductor

Note 3: VMAX = 55V for LT1070HV and LT1071HV to avoid switch

breakdown.

Note 4: Measured with VC in hi clamp, VFB = 0.8V. ISW = 4A for LT1070

and 2A for LT1071.

Note 5: For duty cycles (DC) between 50% and 80%, minimum

guaranteed switch current is given by ILIM = 3.33 (2 – DC) for the

LT1070 and ILIM = 1.67 (2 – DC) for the LT1071.

Similar Part No. - LT1071HVMK

Manufacturer	Part #	Datasheet	Description
Linear Technology	LT1071HVMK	212Kb / 12P	5A and 2.5A High Efficiency Switching Regulators

More results

Similar Description - LT1071HVMK

Manufacturer	Part #	Datasheet	Description
Linear Technology	LT1070	218Kb / 12P	5A and 2.5A High Efficiency Switching Regulators
	LT1071	218Kb / 12P	5A and 2.5A High Efficiency Switching Regulators
	LT1070	212Kb / 12P	5A and 2.5A High Efficiency Switching Regulators
	LT1170	236Kb / 24P	100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators
	LT1171	236Kb / 24P	100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators
	LT1170	266Kb / 20P	100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators
	LT1172	236Kb / 24P	100kHz, 5A, 2.5A and 1.25A High Efficiency Switching Regulators
	LT1270	136Kb / 4P	8A and 10A High Efficiency Switching Regulators
	LT1270A	136Kb / 4P	8A and 10A High Efficiency Switching Regulators
National Semiconductor ...	LM2655	377Kb / 16P	2.5A High Efficiency Synchronous Switching Regulator

More results

LT1071HVMK Datasheet(PDF) 3 Page - Linear Technology

LT1071HVMK Datasheet(HTML) 3 Page - Linear Technology

Similar Part No. - LT1071HVMK

Similar Description - LT1071HVMK

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12

Datasheet Download

Link URL