5

RT8532

DS8532-04

January 2014

www.richtek.com

©

Copyright

2014 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

Note 1. Stresses beyond those listed

“Absolute Maximum Ratings” may cause permanent damage to the device. These are

stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in

the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may

affect device reliability.

Note 2.

θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is

measured at the exposed pad of the package.

Note 3. Devices are ESD sensitive. Handling precaution is recommended.

Note 4. The device is not guaranteed to function outside its operating conditions.

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Minimum On-Time

tON(MIN)

FSW = 1MHz

40

60

80

ns

Maximum Duty

DMAX

FSW = 1MHz

90

93

96

%

LX Current Limit

ILIM

2.2

2.5

2.8

A

Regulated VLEDx

VLEDx

Highest LED String, ILED = 20mA

0.5

0.6

0.7

V

Low Dropout Linear Regulator

LDO Output Voltage Range

VDC

3.6

3.8

4

V

LED Current Programming

LED Current Accuracy

ILEDA

2V > VLEDx > 0.5V, RISET = 12k

19.4

20

20.6

mA

LED Current Matching

ILEDM

2V > VLEDx > 0.5V, RISET = 12k,

Formulated by (ILEDx  IAVG) / IAVG x 100%

--

--

2

%

ISET Pin Voltage

VISET

0.76

1

1.24

V

Fault Protection

OVP Threshold

VOVP

1.16

1.2

1.24

V

OVP UVLO Threshold

VOVPF

--

50

--

mV

Thermal Shutdown

Temperature

TSD

--

150

--

C

OTP Hysteresis

TOTP_Hys

--

30

--

C

LED Pin Under Voltage

Threshold

VLSD

Un-Connection

--

0.1

--

V