WM8321 datasheet(16/253 Pages) WOLFSON

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WM8321

Production Data

PD, February 2012, Rev 4.0

ELECTRICAL CHARACTERISTICS

7.1

DC-DC SYNCHRONOUS BUCK CONVERTERS

DC-DC1 and DC-DC2

Unless otherwise noted: VIN = 3.8V, VOUT = 1.2V, MODE = FCCM

(1), TJ = -40°C to +125°C; typical values are at TJ = 25°C

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Input Voltage

VIN

2.7

5.5

Programmable

Output Voltage

VOUT

FSW = 2MHz

0.6

1.8

FSW = 4MHz

0.6

1.4

VOUT Step Size

VOUT_STEP

12.5

VOUT Accuracy

VOUT_ACC

VIN = 2.7V to 5.5V, IOUT = 0mA to 1250mA

-2.5

+2.5

Undervoltage

margin

VUV

0.6V ≤ VOUT < 0.9V

0.9V ≤ VOUT < 1.3V

1.3V ≤ VOUT ≤ 1.8V

100

Overvoltage

margin

VOV

0.6V ≤ VOUT ≤ 1.8V

100

Output Current

IOUT

FCCM

(1) and Auto (CCM/DCM with PS(2))

Modes

1250

Hysteretic Mode

150

LDO Mode

P-channel

Current Limit

IP_LIM

DCm_FREQ = 01 or 10

1850

DCm_FREQ = 11

2050

Quiescent

Current

IOUT = 0mA, FCCM

(1) and Auto (CCM/DCM with

(2)) Modes (excluding switching losses)

585

A

IOUT = 0mA, Hysteretic Mode

100

IOUT = 0mA, LDO Mode

Shutdown

Current

ISD

DCm_ENA = 0

0.01

A

P-channel

On Resistance

RDSP

VIN = VGS = 3.8V, IDCmLX = 100mA

150



N-channel

On Resistance

RDSN

VIN = VGS = 3.8V, IDCmLX = -100mA

140



Switching

Frequency

FSW

DCm_FREQ = 01

MHz

DCm_FREQ = 1X

Notes:

Forced Continuous Conduction Mode

Continuous / Discontinuous Conduction with Pulse-Skipping Mode

WM8321 数据表(PDF) 16 Page - Wolfson Microelectronics plc

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