LM3673_15 datasheet(5/28 Pages) TI

No. de pieza	LM3673

Descripción Electrónicos	2-MHz, 350-mA Step-Down DC-DC Converter

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Fabricante Electrónico	TI [Texas Instruments]

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LM3673

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SNVS434L – JULY 2006 – REVISED OCTOBER 2015

7.5 Electrical Characteristics

Typical limits apply for TJ = 25°C. Unless otherwise specified, minimum and maximum limits apply over the full operating

ambient temperature range (

−30°C ≤ TA ≤ +85°C). Unless otherwise noted, specifications apply to the LM3673TL with VIN =

EN = 3.6 V.

(1) (2) (3)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VIN

Input voltage

See(4)

2.7

5.5

V

Feedback voltage (fixed /

PWM mode(5)

–2.5%

2.5%

ADJ)

Line regulation

2.7 V

≤ VIN ≤ 5.5 V

VFB

0.025

%/V

IOUT = 20 mA

Load regulation

150 mA

≤ IOUT ≤ 350 mA

0.0015

%/mA

VIN= 3.6 V

VREF

Internal reference voltage

0.5

V

ISHDN

Shutdown supply current

EN = 0V

0.01

1

µA

DC bias current into VIN

No load, device is not switching (FB forced

IQ

16

35

µA

higher than programmed output voltage)

RDSON (P)

Pin-pin resistance for PFET

VIN= VGS= 3.6 V, TA = 25°C

350

450

m

Ω

RDSON (N)

Pin-pin resistance for NFET

VIN= VGS= 3.6 V, TA = 25°C

150

250

m

Ω

ILIM

Switch peak current limit

Open loop(6)

590

750

855

mA

VIH

Logic high input

1

V

VIL

Logic low input

0.4

V

IEN

Enable (EN) input current

0.01

1

µA

ƒOSC

Internal oscillator frequency

PWM mode(5)

1.6

2

2.6

MHz

(1)

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

(2)

Minimum and maximum limits are specified by design, test or statistical analysis. Typical numbers are not verified, but do represent the

most likely norm.

(3)

The parameters in the electrical characteristic table are tested at VIN= 3.6 V unless otherwise specified. For performance over the input

voltage range refer to datasheet curves.

(4)

The input voltage range recommended for ideal applications performance for the specified output voltages are as follows: VIN = 2.7 V to

4.5 V for 1.1 V

≤ VOUT < 1.5 V; VIN = 2.7 V to 5.5 V for 1.5 V ≤ VOUT < 1.8 V; VIN = (VOUT+ VDROPOUT) to 5.5 V for 1.8 V ≤ VOUT ≤ 3.3 V,

where VDROPOUT = ILOAD × (RDSON, PFET + RINDUCTOR).

(5)

Test condition: for VOUT less than 2.5 V, VIN = 3.6 V; for VOUT greater than or equal to 2.5 V, VIN = VOUT + 1 V.

(6)

Refer to for closed-loop data and its variation with regards to supply voltage and temperature. Electrical Characteristics reflects open-

loop data (FB = 0 V and current drawn from SW pin ramped up until cycle-by-cycle current limit is activated). Closed-loop current limit is

the peak inductor current measured in the application circuit by increasing output current until output voltage drops by 10%.

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