RT8105 查看數據表（PDF） - Richtek Technology

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RT8105

5V/12V Synchronous Buck PWM DC/DC Controller

Richtek Technology 

RT8105

Parameter

Error Amplifier (GM)

Symbol

Test Conditions

Min Typ Max Unit

E/A Transconductance

gm

Open Loop DC Gain

AO

PWM Controller Gate Drivers (VCC = 12V)

Upper Gate Source

IUGATE

Upper Gate Sink

Lower Gate Source

Lower Gate Sink

Protection

RUGATE

ILGATE

RLGATE

VBOOT − VPHASE = 12V,

VUGATE − VPHASE = 6V

VBOOT − VPHASE = 12V,

VUGATE − VPHASE = 1V

VCC = 12V, VLGATE = 6V

VCC = 12V, VLGATE = 1V

-- 0.2 -- ms

-- 90 -- dB

0.6 1

--

A

--

4

8

Ω

0.6 1

--

A

--

3

5

Ω

FB Under-Voltage Trip

Δ FBUVT

OC Current Source

IOC

Pre-OVP Threshold (Before POR) VOVP1

OVP Threshold (After POR)

VOVP2

Soft-Start Interval

TSS

FB Falling

VPHASE = 0V

VCC = 3V, Sweep VFB

VCC = 5V, Sweep VFB

70 75 80 %

35 40 45 μA

-- 1.1 1.3 V

1 1.3 1.5 V

-- 3.5 -- ms

Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for

stress ratings. 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 for extended

periods may remain possibility to affect device reliability.

Note 2. θJA is measured in the natural convection at TA = 25°C on a low effective thermal conductivity test board of

JEDEC 51-3 thermal measurement standard.

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

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

DS8105-03 April 2011

www.richtek.com

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