LM3280TLSLASHNOPB datasheet(4/27 Pages) TI

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LM3280

SNOSAU4B – OCTOBER 2006 – REVISED FEBRUARY 2013

www.ti.com

General Electrical Characteristics

(1) (2) (3)

Limits in standard typeface are for TA = TJ = 25°C. Limits in boldface type apply over the full operating ambient temperature

range (

−30°C ≤ TA = TJ ≤ +85°C). Unless otherwise noted, specifications apply to the LM3280 with: VIN = ( SVIN = PVIN = )

3.6V, ENBUCK = 3.6V, ENLDO1 = ENLDO2 = ENLDO3 = BYP = 0V, FB = 2V, VCON = 0.267V.

Symbol

Parameter

Conditions

Min.

Typ.

Max

Units

Shutdown Supply Current

ENBUCK = 0V,

0.1

µA

FB = SW = VCON = 0V,

BYPOUT = 0V

No Load Supply Current

ENBUCK = 3.6V,

720

800

µA

BYPOUT = 0V

ENBUCK = 3.6V,

920

1300

µA

BYPOUT = 0V,

ENLDO1 = 3.6V

ENBUCK = BYP = 3.6V

720

800

µA

ENBUCK = BYP = 3.6V,

920

1300

µA

ENLDO1 = 3.6V

VIH

Logic High Input Threshold Voltage for

FB = 0V

1.2

ENx, BYP

VIL

Logic Low Input Threshold Voltage for

FB = 0V

0.4

ENx, BYP

IPDWN

Logic Input Pull Down Current for ENx,

ENx, BYP = 3.6V

µA

BYP

THSD

Thermal Shutdown Temperature

(2)

150

°C

Hysteresis Temperature

(2)

°C

(1)

All voltages are with respect to the potential at the GND pins.

(2)

Min and Max limits are guaranteed by design, test, or statistical analysis. Typical numbers are not guaranteed, but do represent the

most likely norm.

(3)

The LM3280 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.

Buck Electrical Characteristics

(1) (2) (3)

Limits in standard typeface are for TA = TJ = 25°C. Limits in boldface type apply over the full operating ambient temperature

range (

−30°C ≤ TA = TJ ≤ +85°C). Unless otherwise noted, specifications apply to the LM3280 with: VIN = ( SVIN = PVIN = )

3.6V, ENBUCK = 3.6V, ENLDO1 = ENLDO2 = ENLDO3 = BYP = 0V, FB = 2V, VCON = 0.267V.

Symbol

Parameter

Conditions

Min.

Typ.

Max

Units

VFB_ MIN

Feedback Voltage at Minimum Setting

VCON = 0.267V

0.75

0.800

0.85

VFB_ MAX

Feedback Voltage at Maximum Setting

VCON = 1.20V, VIN = 4.2V

3.528

3.600

3.672

OVP

Over-Voltage Protection Threshold

(4)

330

400

VBYPASS−

Auto Bypass Detection Negative

(5)

160

250

320

Threshold

VBYPASS+

Auto Bypass Detection Positive

(5)

350

450

540

Threshold

RDSON (P)

Pin-Pin Resistance for PFET

ISW = 500mA, FB = 0V

320

450

Ω

RDSON (N)

Pin-Pin Resistance for N-FET

ISW = - 200mA

310

450

Ω

RDSON (BYP) Pin-Pin Resistance for Bypass FET

IBYPOUT = 500mA

120

Ω

(1)

All voltages are with respect to the potential at the GND pins.

(2)

Min and Max limits are guaranteed by design, test, or statistical analysis. Typical numbers are not guaranteed, but do represent the

most likely norm.

(3)

Shutdown current includes leakage current of PFET and Bypass FET.

(4)

Over-Voltage protection (OVP) threshold is the voltage above the nominal VOUT where the OVP comparator turns off the PFET switch

while in PWM mode.

(5)

SVIN is compared to the programmed output voltage (VOUT). When SVIN – VOUT falls below VBYPASS− for longer than TBYP the Bypass

FET turns on and the switching FETs turn off. This is called the Bypass mode. The device comes out of Bypass mode when SVIN –

VOUT exceeds VBYPASS

+ for longer than T

BYP, and PWM mode returns. The hysteresis for the bypass detection threshold VBYPASS

+ –

VBYPASS− will always be positive and will be approximately 200mV (typ.).

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