LTC1436AIGN datasheet(4/28 Pages) LINER

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LTC1436A

LTC1436-PLL-A/LTC1437A

ELECTRICAL CHARACTERISTICS TA = 25°C, VIN = 15V, VRUN/SS = 5V unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Low-Battery Comparator

VSATLBO

LBO Saturation Voltage

ILBO = 1.6mA, VLBI = 1.1V

0.6

ILLBO

LBO Leakage

VLBO = 12V, VLBI = 1.4V

0.01

µA

VTHLBI

LBI Trip Voltage

High to Low Transition on LBO

1.16

1.19

1.22

IINLBI

LBI Input Current

VLBI = 1.19V

150

VHYSLBO

LBO Hysteresis

Auxiliary Regulator/Comparator

IAUXDR

AUXDR Current

VEXTVCC = 0V

Max Current Sinking Capability

VAUXDR = 4V, VAUXFB = 1.0V, VAUXON = 5V

Control Current

VAUXDR = 5V, VAUXFB = 1.5V, VAUXON = 5V

µA

Leakage When Off

VAUXDR = 24V, VAUXFB = 1.5V, VAUXON = 0V

0.01

µA

IIN AUXFB

AUXFB Input Current

VAUXFB = 1.19V, VAUXON = 5V

0.01

µA

IIN AUXON

AUXON Input Current

VAUXON = 5V

0.01

µA

VTH AUXON

AUXON Trip Voltage

VAUXDR = 4V, VAUXFB = 1.0V

1.0

1.19

1.4

VSAT AUXDR

AUXDR Saturation Voltage

IAUXDR = 1.6mA, VAUXFB = 1.0V, VAUXON = 5V

0.4

0.8

VAUXFB

AUXFB Voltage

VAUXON = 5V, 11V < VAUXDR < 24V (Note 5)

11.5

12.5

VAUXON = 5V, 3V < VAUXDR < 7V (Note 5)

1.14

1.19

1.24

VTH AUXDR

AUXFB Divider Disconnect Voltage

VAUXON = 5V (Note 5), Ramping Negative

7.5

8.5

9.5

Note 4: Oscillator frequency is tested by measuring the COSC charge and

discharge currents and applying the formula:

fOSC (kHz) =

–1

8.4(108)

COSC (pF) + 11

() 1

ICHG

()1

IDIS

Note 5: The Auxiliary Regulator is tested in a feedback loop which servos

VAUXFB to the balance point for the error amplifier. For applications with

VAUXDR > 9.5V, VAUXFB uses an internal resistive divider. See

Applications Information.

Note 6: The minimum on-time test condition corresponds to an inductor

peak-to-peak ripple current

≥ 40% of IMAX (see Minimum On-Time

Considerations in the Applications Information section).

The q denotes specifications which apply over the full operating

temperature range.

LTC1436ACGN/LTC1436ACGN-PLL/LTC1437ACG: 0

°C ≤ TA ≤ 70°C

LTC1436AIGN/LTC1436AIGN-PLL/LTC1437AIG: – 40

°C ≤ TA ≤ 85°C

Note 1: TJ is calculated from the ambient temperature TA and power

dissipation PD according to the following formulas:

LTC1436ACGN/LTC1436ACGN-PLL/LTC1436AIGN/

LTC1436AIGN-PLL: TJ = TA + (PD)(110 °C/W)

LTC1437ACG/LTC1437AIG: TJ = TA + (PD)(95 °C/W)

Note 2: The LTC1436A/LTC1437A are tested in a feedback loop which

servos VOSENSE to the balance point for the error amplifier

(VITH = 1.19V).

Note 3: Dynamic supply current is higher due to the gate charge being

delivered at the switching frequency. See Applications Information

section.

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