LM3243

SNVS782B – OCTOBER 2010 – REVISED FEBRUARY 2013

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ELECTRICAL CHARACTERISTICS

(1) (2) (3)

range (

(page 2) with: PVIN = VDD = EN = 3.8V, BP = 0V.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Feedback voltage at low

VCON = 0.16V, MODE = LOW

0.350

0.400

0.450

V

setting

(3)

Feedback voltage at high

3.492

3.6

3.708

V

setting

Shutdown supply current

0.02

4

µA

DC bias current into VDD

260

310

MODE = HIGH

µA

DC bias current into VDD

975

1100

MODE = LOW

Positive transient peak current

1.9

2.1

A

limit

Positive steady state peak

VACB = 3.05V

1.34

1.45

1.65

A

State

current limit

Positive active current assist

VCON = 0.6V, VACB = 2.8V

1.40

1.70

2.00

A

peak current limit

(6)

NFET Switch negative peak

−1.69

−1.50

−1.31

A

current limit

Average Internal oscillator

VCON = 1.0V

2.43

2.70

2.97

MHz

frequency

Logic HIGH input threshold

BP, EN, MODE

1.2

V

Logic LOW input threshold

BP, EN, MODE

0.5

EN pin pulldown current

EN = 3.6V

0

5

10

Pin input current

BP, MODE

−1

1

µA

VCON pin leakage current

VCON = 1.0V

−1

1

Gain

0.16V

2.5

V/V

(1)

All voltages are with respect to the potential at the GND pins. The LM3243 is designed for mobile phone applications where turn-on after

power-up is controlled by the system controller and where requirements for a small package size overrule increased die size for internal

Under Voltage Lock-Out (UVLO) circuitry. Thus, it should be kept in shutdown by holding the EN pin LOW until the input voltage

exceeds 2.7V.

(2)

Min and Max limits are specified by design, test, or statistical analysis.

(3)

The parameters in the electrical characteristics table are tested under open loop conditions at PVIN = VDD = 3.8V. For performance

over the input voltage range and closed-loop results, refer to the datasheet curves.

(4)

Shutdown current includes leakage current of PFET.

(5)

(6)

Current limit is built-in, fixed, and not adjustable.

(7)

Linearity limits are ±3% or ±50 mV, whichever is larger.

4

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