3

LTC1433/LTC1434

range.

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

of a device may be impaired.

Note 2: C-grade device specifications are guaranteed over the 0

°C to 70°C

temperature range. In addition, C-grade device specifications are assured

over the – 40

°C to 85°C temperature range by design or correlation, but

are not production tested.

Note 3: I-grade device specifications are guaranteed over the – 40

°C to

85

°C temperature range by design, testing or correlation.

Note 5: The LTC1433/LTC1434 are tested in a feedback loop which servos

Note 6: Dynamic supply current is higher due to the gate charge being

delivered at the switching frequency.

discharge currents and applying the formula:

+

–1

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

–4

–10

µA

4

10

µA

Main Control Loop

Input DC Supply Current

(Note 6)

Normal Mode

470

µA

Shutdown, Reference Alive

35

70

µA

Complete Shutdown

15

30

µA

RUN/SS Threshold

q

0.8

1.3

2

V

Soft Start Current Source

1.2

3

4.5

µA

Oscillator and Phase-Locked Loop

Oscillator Frequency

112

125

142

kHz

200

240

kHz

PLL Input Resistance

50

k

Ω

Phase Detector Output Current

Sinking Capability

10

15

20

µA

Sourcing Capability

10

15

20

µA

Power-On Reset

POR Saturation Voltage

0.6

1.0

V

POR Leakage

0.2

1.0

µA

POR Trip Voltage from Regulated

– 11

– 7.5

– 4

%

Output

POR Delay

65536

Cycles

Low-Battery Comparator

LBO Saturation Voltage

0.6

1.0

V

LBO Leakage

0.01

1.0

µA

LBI Trip Voltage

High to Low Transition on LBO

1.16

1.19

1.22

V

Low-Battery Comparator Hysteresis

40

mV

Low-Battery Shutdown Trip Point

0.74

V

LBI Input Current

1

50

nA

P-Channel Power FETs Characteristics

3.3

4.1

Ω

0.8

1.2

Ω

Small FET Leakage

q

7

1000

nA

Big FET Leakage

q

5

1000

nA