RT8525 datasheet(4/10 Pages) RICHCO

Part #	RT8525

Description	Boost Controller with Dimming Control

Download	10 Pages

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Manufacturer	RICHCO [Richco, Inc.]

Direct Link	http://www.richco-inc.com

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4 / 10 page

4

RT8525

www.richtek.com

DS8525-01 March 2012

©

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 low effective thermal conductivity single-layer test board per JEDEC 51-3.

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

Boost Controller

Switching Frequency

fSW

RSW = 56kΩ

--

200

--

kHz

Minimum On-Time

tMON

--

250

--

ns

Maximum Duty

DMAX

Switching

90

--

%

Feedback Voltage

VFB

1.225 1.25

1.275

V

Slope Compensation

Peak Magnitude of Slope

Compensation Current

ISLOPE, PK

--

50

--

μA

Soft-Start

Soft-Start Current

ISS

3

4

5

μA

Gate Driver

RDS(ON)_N

ISINK = 100mA (N-MOSFET)

--

1

--

Ω

DRV On-Resistance

RDS(ON)_P

ISOURCE = 100mA (P-MOSFET)

--

1.5

--

Ω

Peak Sink Current

IPEAKsk

CLOAD = 1nF

--

2.2

--

A

Peak Source Current

IPEAKsr

CLOAD = 1nF

--

2.55

--

A

Rise Time

tr

CLOAD = 1nF

--

6

--

ns

Fall Time

tf

CLOAD = 1nF

--

5

--

ns

PWM Dimming Control

Logic-High

VPWMI_H

2

--

PWMI

Threshold

Voltage

Logic-Low

VPWMI_L

--

0.8

V

Protection Function

OCP Threshold

VOCP

Including Slope Compensation Magnitude

--

0.4

--

V

VOUT OVP Threshold

VOVP

2.375

2.5

2.625

V

VOUT UVP Threshold

VUVP

--

0.1

--

V

Thermal Shutdown

Temperature

TSD

--

150

--

°C

Thermal Shutdown

Hysteresis

ΔTSD

--

50

--

°C

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