LT1076-5 datasheet(3/8 Pages) LINER

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LT1076-5

10765fc

ELECTRICAL CHARACTERISTICS

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: To calculate maximum switch “on” voltage at currents between

low and high conditions, a linear interpolation may be used.

Note 3: A sense pin voltage (VSENSE) of 5.5V forces the VC pin to its low

clamp level and the switch duty cycle to zero. This approximates the zero

load condition where duty cycle approaches zero.

Note 4: Total voltage from VIN pin to ground pin must be ≥ 8V after start-

up for proper regulation. For TA < 25°C, limit = 5V.

Note 5: Switch frequency is internally scaled down when the sense pin

voltage is less than 2.6V to avoid extremely short switch on times. During

The

l denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at TJ = 25°C. VIN = 25V, unless otherwise noted.

current limit testing, VSENSE is adjusted to give a minimum switch on time

of 1ms.

Note 6: Switch to input voltage limitation must also be observed.

Note 7: VMAX = 40V for the LT1076-5 and 60V for the LT1076HV-5.

Note 8: Error ampliﬁer voltage gain and transconductance are

speciﬁed relative to the internal feedback node. To calculate gain and

transconductance from the Sense pin (Output) to the VC pin, multiply by

0.44.

Note 9: Does not include switch leakage.

Note 10:

LIM

≈

−1

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Supply Current (Note 3)

VOUT = 5.5V, VIN ≤ 40V

40V < VIN < 60V

VSHDN = 0.1V (Device Shutdown) (Note 9)

8.5

9.0

140

300

μA

Minimum Supply Voltage

Normal Mode

Start-Up Mode (Note 4)

7.3

3.5

8.0

4.8

Switch Current Limit (Note 5)

ILIM = Open

RLIM = 10k (Note 10)

RLIM = 7k (Note 10)

2.6

1.8

1.2

3.2

Maximum Duty Cycle

Switching Frequency

TJ ≤ 125°C

VOUT = VSENSE = 0V (Note 5)

100

110

120

kHz

Switching Frequency Line Regulation 8V ≤ VIN ≤ VMAX (Note 8)

0.03

0.1

%/V

Error Ampliﬁer Voltage Gain (Note 8) 1V ≤ VC ≤ 4V

2000

V/V

Error Ampliﬁer Transconductance

(Note 8)

3700

5000

8000

μmho

Error Ampliﬁer Source and Sink

Current

Source (VSENSE = 4.5V)

Sink (VSENSE = 5.5V)

100

0.7

140

1.0

225

1.6

μA

Sense Pin Divider Resistance

358

kΩ

Sense Voltage

VC = 2V

4.85

5.15

Output Voltage Tolerance

VOUT (Nominal) = 5V

All Conditions of Input Voltage, Output Voltage,

Temperature and Load Current

±0.5

±1.0

±2

±3

Output Voltage Line Regulation

8V ≤ VIN ≤ VMAX (Note 7)

0.005

0.02

%/V

VC Voltage at 0% Duty Cycle

Over Temperature

1.5

–4.0

mV/°C

Multiplier Reference Voltage

Shutdown Pin Current

VSHDN = 5V

VSHDN ≤ VTHRESHOLD (≅ 2.5V)

510

μA

Shutdown Thresholds

Switch Duty Cycle = 0

Fully Shut Down

2.2

0.1

2.45

0.30

2.7

0.5

Thermal Resistance Junction to Case

4°C/W

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