WM8352 datasheet(18/336 Pages) WOLFSON

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WM8352

Production Data

PD, February 2011, Rev 4.4

7.2

DC-DC STEP UP CONVERTER ELECTRICAL CHARACTERISTICS

Test Conditions

TA = +25ºC unless otherwise noted.

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

DC-DC2 and DC-DC5

Input voltage

range

VIN

when used as converter

2.7

3.7

5.5

when used as switch

1.2

Output voltage

range

VOUT

by default

(needs external component configuration)

VIN

(30)

USB OTG output

voltage

VOUT,USB

VIN<4.5V; IOUT<100mA;

DCn_FBSRC [1:0]=11

5.0

Output current

IOUT

VOUT=30V

VOUT=20V

(DCn_ILIM_=1)

(18)

VOUT=5.0V

(DCn_ILIM_=1)

170

(100)

Switch resistance

RON

VIN=3.3V; VOUT=3.2V; +25°C

0.26

Ω

VIN=1.8V; VOUT=1.7V; +25°C

0.41

VIN=1.2V; VOUT=1.1V; +25°C

0.84

Maximum switch

current

ISW,MAX

700

Switching

frequency

fCLK

1.0

MHz

Maximum duty

cycle

DMAX

VIN=3V; fCLK=1.0MHz

Efficiency

VIN=3.8V; VOUT=20V; IOUT=20mA

VIN=3.8V; VOUT=5.0V; IOUT=100mA

Quiescent current

IDD

Shutdown or switch configuration

0.1

active; no switching

260

active; pulse skipping

260

Regulated

feedback voltage

VFB

DCn_FBSRC [1:0] = 00

0.5

VCURR

DCn_FBSRC [1:0] = 01 or 10

0.5

Undervoltage

detect

VFB,UV

below feedback voltage

VUSB,UV

DCn_FBSRC [1:0] = 11

4.6

Overvoltage

detect

VFB,OV

above feedback voltage

VUSB,OV

DCn_FBSRC [1:0] = 11

5.4

Peak inductor

current limit

IPK

VIN=3V; VOUT=90%;

700

DCn_ILIM_=1

450

On resistance of

NGATE driver

RNGATE

P-Channel FET (IPFET=100mA)

4.6

Ω

N-Channel FET (INFET=100mA)

4.9

Input capacitor

CIN

X5R/X7R dielectric

1.0

2.2

μF

Inductor

-30%

+30%

μH

Inductor current

rating

ISAT,Lf

500

DCn_ILIM_=1

320

Output capacitor

COUT

DCn_FBSRC [1:0]= 00 or 11; VOUT=5V

3.7

μF

DCn_FBSRC [1:0]= 00; VOUT=10V

0.84

2.2

4.7

DCn_FBSRC [1:0]= 00; VOUT=20V

0.18

0.47

1.0

DCn_FBSRC [1:0]= 01 or 10; VOUT=10V

2.0

4.7

DCn_FBSRC [1:0]= 01 or 10; VOUT=15V

1.5

2.2

DCn_FBSRC [1:0]= 01 or 10; VOUT=20V

0.9

1.5

4.7

WM8352 Datasheet(PDF) 18 Page - Wolfson Microelectronics plc

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