LM26480SQ-AA_NOPB datasheet(4/37 Pages) TI1

部件名	LM26480SQ-AA_NOPB

功能描述	LM26480 Externally Programmable Dual High-Current Step-Down DC/DC and Dual Linear Regulators

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制造商	TI1 [Texas Instruments]

网页	http://www.ti.com

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LM26480

SNVS543I – JANUARY 2008 – REVISED MAY 2013

www.ti.com

Connection Diagram

Figure 2. 24-Lead WQFN Package (top view)

Table 1. Default Options

Oscillator

Order Suffix

Spec

Buck Modes

nPOR Delay

UVLO

Sync

AECQ

Frequency

SQ-AA

NOPB

2.0 MHz

Auto-Mode

60 mS

Enabled

Disabled

No

QSQ-AA

NOPB

2.0 MHz

Auto-Mode

60 mS

Enabled

Disabled

Grade 1

QSQ-CF

NOPB

2.1 MHz

Forced PWM

60 mS

Disabled

Grade 1

SQ-BF

NOPB

2.0 MHz

Forced PWM

60 mS

Enabled

No

QSQ-8D

NOPB

2.1 MHz

Forced PWM

130 µS

Enabled

Disabled

Grade 1

Table 2. PIN DESCRIPTIONS(1)

WQFN Pin

Name

I/O

Type

Description

No.

1

VINLDO12

I

PWR

Analog Power for Internal Functions (VREF, BIAS, I2C, Logic)

2

SYNC

I

G/(D)

Frequency Synchronization pin which allows the user to connect an external clock

signal to synchronize the PMIC internal oscillator. Default OFF and must be

grounded when not used. Part number LM26480SQ-BF has this feature enabled.

Please contact Texas Instruments Sales Office/Distributors for availability of

LM26480SQ-BF.

3

NPOR

O

D

nPOR Power on reset pin for both Buck1 and Buck 2. Open drain logic output 100K

pullup resistor. nPOR is pulled to ground when the voltages on these supplies are

not good. See Flexible Power-On Reset (i.e., Power Good with Delay) section for

more info.

4

GND_SW1

G

Buck1 NMOS Power Ground

5

SW1

O

PWR

Buck1 switcher output pin

6

VIN1

I

PWR

Power in from either DC source or Battery to Buck1

7

ENSW1

I

D

Enable Pin for Buck1 switcher, a logic HIGH enables Buck1. Pin cannot be left

floating.

8

FB1

I

A

Buck1 input feedback terminal

9

GND_C

G

Non-switching core ground pin

10

AVDD

I

PWR

Analog Power for Buck converters

11

FB2

I

A

Buck2 input feedback terminal

12

ENSW2

I

D

Enable Pin for Buck2 switcher, a logic HIGH enables Buck2. Pin cannot be left

floating.

13

VIN2

I

PWR

Power in from either DC source or Battery to Buck2

(1)

A: Analog Pin

D: Digital Pin

G: Ground Pin

PWR: Power Pin

I: Input Pin

I/O: Input/Output Pin

O: Output Pin

4

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