RT4539A

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is a registered trademark of Richtek Technology Corporation

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DS4539A-01

December 2022

6

Absolute Maximum Ratings (Note 1)



Supply Voltage, VIN to GND --------------------------------------------------------------------------------------- −0.3V to 26.4V



LX, VOUT, FB1, FB2, FB3, FB4, FB5, FB6 to GND -------------------------------------------------------- −0.3V to 42V



EN, PWM, SDA, SCL, VCP to GND ----------------------------------------------------------------------------- −0.3V to 6V



Power Dissipation, PD @ TA = 25°C

WL-CSP-20B 1.71x2.371 (BSC)----------------------------------------------------------------------------------- 3.02W

WQFN-24L 4x4 -------------------------------------------------------------------------------------------------------- 3.57W



Package Thermal Resistance

(Note 2)

WL-CSP-20B 1.71x2.371 (BSC), θJA----------------------------------------------------------------------------- 33.1°C/W

WQFN-24L 4x4, θJA -------------------------------------------------------------------------------------------------- 28°C/W

WQFN-24L 4x4, θJC -------------------------------------------------------------------------------------------------- 7.1°C/W



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



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



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



ESD Susceptibility

(Note 3)



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

Recommended Operating Conditions (Note 4)



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



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

Electrical Characteristics

(VIN = 3.8V, TA = 25°C, unless otherwise specified)

Parameter

Symbol

Test Conditions

Min

Typ

Max Unit

Input Power Supply

Input Supply Voltage

VIN

2.7

3.8

24

V

Quiescent Current

IQ

LX no switching, PWM duty = 0%

1.5

2.4

3.7

mA

Shutdown Current

ISHDN

VIN = 3.8V, EN = 0V

--

--

10

µ

A

Under-Voltage Lockout

Threshold

VUVLO

VIN rising

1.88

2.3

2.72

V

Under-Voltage Lockout

Hysteresis

∆

VUVLO

50

200

470

mV

Over-Temperature Protection

Threshold

TOTP

--

150

--

°

C

Over-Temperature Protection

Hysteresis

TOTP_HYS

--

30

--

°

C

Internal LDO Voltage

VCP

No load

3.1

3.4

3.7

V

Interface Characteristic

EN, PWM,

SCL, SDA

Input Voltage

Logic-High

VIH

1.2

--

--

V

Logic-Low

VIL

--

--

0.6

V

Internal pull low resistor for

EN, PWM

RPULL_LOW

0.5

1.3

2

MΩ

Internal Pull-Low Current for

SCL, SDA

IIH_2

--

0.01

1

µ

A