LM3243 datasheet(5/32 Pages) TI1

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LM3243

www.ti.com

SNVS782C – OCTOBER 2010 – REVISED AUGUST 2015

6.4 Thermal Information

LM3243

THERMAL METRIC(1)

TMD (DSBGA)

UNIT

16 PINS

RθJA

Junction-to-ambient thermal resistance

°C/W

(1)

For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application

report, SPRA953.

6.5 Electrical Characteristics

Unless otherwise noted, all specifications apply to Typical System Application Diagram with: PVIN = VDD = EN = 3.8 V,

BP = 0 V. All typical (TYP) limits apply for TA = TJ = 25°C, and all minimum (MIN) and maximum (MAX) apply over the full

operating ambient temperature range (

−30°C ≤ TA = TJ ≤ +90°C), unless otherwise specified.

(1) (2) (3)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Feedback voltage at low

VFB, LOW

VCON = 0.16 V, MODE = LOW (3)

0.35

0.40

0.45

setting

Feedback voltage at high

VCON = 1.44 V, VIN = 3.9 V,

VFB, HIGH

3.492

3.6

3.708

setting

MODE = LOW(3)

ISHDN

Shutdown supply current

EN = SW = VCON = 0 V(4)

0.02

µA

No switching(5)

Iq_PFM

DC bias current into VDD

260

310

µA

MODE = HIGH

No switching(5)

Iq_PWM

DC bias current into VDD

975

1100

µA

MODE = LOW

Positive transient peak

ILIM,PFET,Transient

VCON = 0.6 V(6)

1.9

2.1

current limit

Positive steady-state peak

VACB = 3.05 V

ILIM,PFET,Steady State

1.34

1.45

1.65

current limit

VCON = 0.6 V(6)

Positive active current assist

ILIM, P_ACB

VCON = 0.6 V, VACB = 2.8 V(6)

1.4

1.7

peak current limit

NFET switch negative peak

ILIM, NFET

VCON = 1 V(6)

−1.69

−1.50

−1.31

current limit

Average Internal oscillator

FOSC

VCON = 1 V

2.43

2.7

2.97

MHz

frequency

VIH

Logic HIGH input threshold

BP, EN, MODE

1.2

VIL

Logic LOW input threshold

BP, EN, MODE

0.5

IEN

EN pin pulldown current

EN = 3.6 V

µA

IIN

Pin input current

BP, MODE

–1

µA

IVCON

VCON pin leakage current

VCON = 1 V

–1

µA

Gain

VCON to VOUT Gain

0.16 V

≤ VCON ≤ 1.44 V(7)

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 turnon after

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

undervoltage lock-out (UVLO) circuitry. Thus, it should be kept in shutdown by holding the EN pin LOW until the input voltage exceeds

2.7 V.

(2)

Minimum and Maximum 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 = 3.8 V. 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)

Iq specified here is when the part is not switching. For operating input current at no load, refer to datasheet curves.

(6)

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

(7)

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

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