RT8121GQW Datasheet RT8121GQW | P4-P6

RT8121

DS8121-02 May 2011www.richtek.com

Parameter Symbol Test Conditions Min Typ Max Unit

VCC12 Supply Input

VCC12 Supply Voltage V

VCC12

No Switching 10.8 12 13.2 V

VCC12 Supply Current I

VCC12

-- 6 -- mA

VCC5 Power

VCC5 Supply Voltage V

VCC5

LOAD

= 10m A 4.9 5 5.1 V

VCC5 Output Sourcing I

VCC5

10 -- -- mA

Power On Reset

VCC12 Rising Threshold V

VCC12_th

9.2 9.6 10 V

VCC12 Hysteresis V

VCC12_hys

-- 0.9 -- V

VCC5 Rising Threshold V

VCC5_ th

4.4 4.6 4.8 V

VCC5 Hysteresis V

VCC5_ hys

-- 0.4 -- V

= 25°C, unless otherwise specified)

Electrical Characteristics

Recommended Operating Conditions

(Note 4)

z Power Input Voltage, V

--------------------------------------------------------------------------------- 4.5V to 13.2V

z Junction Temperature Range ---------------------------------------------------------------------------- −40°C to 125°C

z Ambient Temperature Range ---------------------------------------------------------------------------- −40°C to 85°C

Absolute Maximum Ratings (Note 1)

z Supply Input Voltage -------------------------------------------------------------------------------------- −0.3V to 15V

z BOOT to PHASE ------------------------------------------------------------------------------------------ 1.7V to 15V

z PHASE to GND

DC ------------------------------------------------------------------------------------------------------------- −2V to 15V

<20ns -------------------------------------------------------------------------------------------------------- −5V to 30V

z UGATE to PHASE

DC ------------------------------------------------------------------------------------------------------------- −0.3V to 15.3V

<20ns -------------------------------------------------------------------------------------------------------- −5V to 18V

z LGATE to GND

DC ------------------------------------------------------------------------------------------------------------- (GND − 0.3V) to (V

+ 0.3V)

<20ns -------------------------------------------------------------------------------------------------------- (GND − 5V) to (V

+ 5V)

z Input/Output Voltage -------------------------------------------------------------------------------------- −0.3V to 6.5V

z Power Dissipation, P

@ T

= 25°C

WQFN-20L 3x3 -------------------------------------------------------------------------------------------- 1.471W

z Package Thermal Resistance (Note 2)

WQFN-20L 3x3, θ

--------------------------------------------------------------------------------------- 68°C/W

WQFN-20L 3x3, θ

-------------------------------------------------------------------------------------- 7.5°C/W

z Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------- 260°C

z Junction Temperature ------------------------------------------------------------------------------------- 150°C

z Storage Temperature Range ---------------------------------------------------------------------------- −65°C to 150°C

z ESD Susceptibility (Note 3)

HBM (Human Body Mode) ------------------------------------------------------------------------------ 2kV

MM (Machine Mode) -------------------------------------------------------------------------------------- 200V

To be continued

RT8121

DS8121-02 May 2011 www.richtek.com

To be continued

Parameter Symbol Test Conditions Min Typ Max Unit

RT/EN

Chip Disable Threshold V

DIS

-- -- 0.4 V

Running Frequency f

OSC

= 60kΩ 180 200 220 kHz

RT Pin Voltage V

RT, GND

= 60kΩ, when RT

connected to GND by a register

1.52 1.6 1.68 V

RT Pin Voltage V

RT, VDD

= 60kΩ, when RT

connected to V

CC5

by a register

VCC5

−

1.68

VCC 5

−

1.6

VCC5

−

1.52

Modulation Gain A

RAMP

= 60kΩ

-- 22 -- %/V

Reference Voltage Accuracy

DAC Accuracy −0.5 -- 0.5 %

VID Input Low Voltage VID -- -- 0.4 V

VID Input High Voltage VID 0.8 -- -- V

Error Amplifier

DC Gain A

No Load -- 80 -- dB

Gain-Bandwidth GBW C

LOAD

= 10pF -- 10 -- MHz

Slew Rate SR C

LOAD

= 10pF 10 -- -- V/μs

Output Voltage Range V

COMP

0.5 -- 3.6 V

Maximum Current I

EA_SLEW

Slew 300 -- -- μA

Power Sequence

PGOOD Low Voltage V

PGOOD

= 4mA -- -- 0.4 V

Soft-Start Delay TD1 0 -- 5 ms

PGOOD Delay TD3 0.05 -- 4 ms

Current Sense Amplifier

Maximum Current I

GMMAX

CSP

= 1.3V, sink current from

CSN

100 -- -- μA

Input Offset Voltage V

OSCS

−1.5 0 1.5 mV

Soft-Start

Soft-Start Current I

SS1

Slew 12 16 20 μA

VID Change Current I

SS2

Slew 120 160 200 μA

Gate Driver

UGATE Drive Source I

UGATEsr

BOOT

– V

PHASE

= 12V,

UGATE

– V

PHASE

= 6V

0.6 1 -- A

UGATE Drive Sink R

UGATEsk

BOOT

– V

PHASE

= 12V,

UGATE

– V

PHASE

= 1V

-- 1 -- Ω

LGATE Drive Source I

LGATEsr

VCC12

= 12V, V

LGATE

= 6V 0.6 1 -- A

LGATE Drive Sink R

LGATEsk

VCC12

= 12V, V

LGATE

= 1V -- 0.8 -- Ω

Protection

Over Voltage Threshold V

OVP

Sweep FB Voltage, V

− V

EAP

125 150 175 mV

OCP Input Offset Voltage V

OCOFS

−10 -- 10 mV

Thermal Shutdown -- 160 -- °C

RT8121

DS8121-02 May 2011www.richtek.com

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. θ

is measured in natural convection at T

= 25°C on a high effective thermal conductivity four-layer test board of

JEDEC 51-7 thermal measurement standard. The measurement case position of θ

is on 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 Conditions Min Typ Max Unit

Dynamic Characteristic

UGATE Rise Time t

rUGATE

ISS

= 3000pF

- 15 - n s

UGATE Fall Tim e t

fUGATE

- 10 - n s

LGATE Rise Time t

rLGATE

- 15 - n s

LGATE Rise Time t

fLGATE

- 10 - n s

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P16

RT8121GQW

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RT8121GQW