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RT8205L

High Efficiency, Main Power Supply Controller for Notebook Computer

Richtek Technology 

RT8205L/M

Electrical Characteristics

(VIN = 12V, VEN = 5V, VENTRIP1 = VENTRIP2 = 2V, No Load, TA = 25°C, unless otherwise specified)

Parameter

Symbol

Test Conditions

Min Typ Max Unit

Input Supply

VIN Standby Current IVIN_SBY VIN = 6V to 25V, ENTRIPx = GND

-- 200 --

μA

VIN Shutdown Supply

Current

IVIN_SHDN

Quiescent Power

Consumption

PVIN

+PPVCC

SMPS Output and FB Voltage

VIN = 6V to 25V,

ENTRIPx = EN = GND

Both SMPS On, VFBx = 2.1V,

SKIPSEL = REF, VOUT1 = 5V,

VOUT2 = 3.3V (Note 5)

DEM Mode

FBx Voltage

VFBx

PWM Mode (Note 6)

Ultrasonic Mode

SECFB Voltage

Output Voltage Adjust

Range

VOUTx Discharge

Current

On-Time

VSECFB

VOUTx

On-Time Pulse Width tON

SMPS1, SMPS2

VOUTx = 0.5V, VENTRIPx = 0V

TONSEL = GND VOUT1 = 5.05V (200kHz)

VOUT2 = 3.33V (250kHz)

TONSEL = REF VOUT1 = 5.05V (300kHz)

VOUT2 = 3.33V (375kHz)

TONSEL =

VREG5

VOUT1 = 5.05V (400kHz)

VOUT2 = 3.33V (500kHz)

Minimum Off-Time

tOFF

Ultrasonic Mode

Frequency

Soft-Start

FBx = 1.9V

SKIPSEL = VREG5 or VREG3

Soft-Start Time

Current Sense

ENTRIPx Source

Current

ENTRIPx Current

Temperature

Coefficient

ENTRIPx Adjustment

Range

Current Limit

Threshold

Zero-Current

Threshold

tSSx

Internal Soft-Start

IENTRIPx VENTRIPx = 0.9V

TCIENTRIPx In Comparison with 25°C (Note 6)

VENTRIPx = IENTRIPx x RENTRIPx

GND − PHASEx, VENTRIPx = 2V

GND − PHASEx in DEM

-- 20 40 μA

--

5

7 mW

1.975 2 2.025

--

2

--

V

-- 2.032 --

1.92 2 2.08 V

2

-- 5.5

V

10 45 -- mA

1895 2105 2315

999 1110 1221

1227 1403 1579

647 740 833

ns

895 1052 1209

475 555 635

200 300 400 ns

22 33 -- kHz

--

2

--

ms

9.4 10 10.6 μA

-- 4700 -- ppm/°C

0.515 --

3

V

180 200 220 mV

--

3

-- mV

DS8205L/M-05 June 2011

To be continued

www.richtek.com

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