User Guide for RTQ2539C Low Dropout Linear Regulator Evaluation Board

EVB_RTQ2539CGQWF

ACTIVE

The RTQ2539C is a high-current, ultra-low noise, ultra low-dropout (LDO) linear regulator. This document explains the function and use of the RTQ2539C evaluation board (EVB) and provides information for the setup and operating instructions, a schematic diagram, a printed circuit board (PCB) layout, and a bill of materials (BOM). For more detail information, please refer to the RTQ2539C datasheet.

General Description

Performance Specification Summary

The RTQ2539C Evaluation Board (EVB) is a four-layer board measuring 50mm x 33.5mm with a copper thickness of 1oz, and the Table 1 is the summary of the EVB performance specificiaiton.

Table 1. RTQ2539C Evaluation Board Performance Specification Summary

Key Features	Test Conditions	Min	Typ	Max	Unit
Input Range
Input Voltage		1.1	1.1	6.5	V
Enable Input Voltage		1.1	--	6.5	V
Output Range
Output Voltage	Using external resistive voltage divider	0.5	0.5	5.5	V
Line Regulation	I_OUT = 1mA, 1.1V ≤ V_IN ≤ 6.5V	--	0.05	--	%/V
Load Regulation	1mA ≤ I_OUT ≤ 3A	--	0.08	--	%/A
Dropout Voltage	V_IN = 1.1V to 6.5V, I_OUT = 3A, V_FB = 0.5V - 3%	--	55	130	mV
Package
WQFN-12L 2.2x2.5 (FC)

Power-up & Measurement Procedure

Suggestion Required Equipments:

RTQ2538H evaluation board

DC power supply capable of at least 6.5V and 3A

Electronic load capable of 3A

Function generator

Oscilloscope

Test Procedure with Suitable Measurement Equipment:

Connect input power supply with wide and short as possible to VIN and GND through GP1/GP2 terminals.
Connect the electronic load to VOUT and GND through GP3/GP4 terminals.
Turn on the power supply and make sure that the input voltage does not exceeds 6V.
Check output voltage regulation with different IOUT for normal operation.

Notifications:

Do not turn on input power supply before all connections are ready.
Do not use the oscilloscope probe with long ground lead for output ripple voltage measurement, it is recommended to touch the probe tip and groundring directly across the last output capacitor.

Detailed Description of Hardware

Headers Description and Placement

Carefully inspect all the components used in the EVB according to the following Bill of Materials table, and then make sure all the components are undamaged and correctly installed. If there is any missing or damaged component, which may occur during transportation, please contact our distributors or e-mail us at evb_service@richtek.com.

Test Points

The EVB is provided with the test points and pin names listed in the table below.

Test Point	Pin Name	Description
GP1	VIN	Positive terminal for supply input voltage.
GP2	GND	Negative terminal for supply input voltage.
GP3	VOUT	Positive terminal for output voltage.
GP4	GND	Negative terminal for output voltage.
GP5	GND	Reference ground test point.
TP1	VIN	For supply input voltage measurement.
TP2	EN	Enable voltage input pin.
TP3	PGOOD	For power good measurement.
TP4	VOUT	For output voltage measurement.
JP1	Enable	Connection for Enable voltage.
JP2	PGOOD	Connection for power good pu-ll high voltage.

Bill of Materials

Reference	Count	Part Number	Description	Package	Manufacturer
U1	1	RTQ2539CGQWF	Linear Regulator	WQFN-12L 2.2x2.5 (FC)	RICHTEK
C3, C6	2	1210X476K160CT	Capacitor, Ceramic, 47µF, 16V, X5R	C-1210	WALSIN
C4, C5	2	0603B104K500CT	Capacitor, Ceramic, 0.1µF, 50V, X7R	C-0603	WALSIN
C9, C11	2	0603B103K500CT	Capacitor, Ceramic, 10nF, 50V, X7R	C-0603	WALSIN
C10	1	0603B105K250CT	Capacitor, Ceramic, 1µF, 25V, X5R	C-0603	WALSIN
R1	1	WR06X1072FTL	Resistor, Chip, 10.7k, 1%	R-0603	WALSIN
R2	1	WR06X1911FTL	Resistor, Chip, 1.91k, 1%	R-0603	WALSIN
R3, R5	2	WR06X1003FTL	Resistor, Chip, 100k, 1%	R-0603	WALSIN

Typical Applications

EVB Schematic Diagram

Measure Result

PSRR vs. Frequency and V_OUT	PSRR vs. Frequency and I_OUT

Output Noise vs. Frequency and V_OUT	Output Noise vs. Frequency and C_NR/SS

Power Up Response	Load Transient Response

Evaluation Board Layout

Figure 1 to Figure 4 are the RTQ2539C evaluation board layout.

Figure 1. Top View (1^st layer)

Figure 2. Inner Side (2^nd Layer)

Figure 3. Inner Side (3^rd Layer)

Figure 4. Bottom View (4^th Layer)

Title	Last Update	Share
Evaluation Board User Guide	2024/05/31	Email RSS Google+ twitter Linkedin
Bill of Materials	2024/05/31	Email RSS Google+ twitter Linkedin
Schematic	2024/05/31	Email RSS Google+ twitter Linkedin
Gerber File	2024/05/31	Email RSS Google+ twitter Linkedin

RTQ2539C

The RTQ2539C is a high-current (3A), low-noise (6.8μV_RMS), high accuracy (1% over line, load, and temperature), low-dropout linear regulator (LDO) capable of sourcing 3A with extremely low dropout (max. 180mV for RTQ2539CGQV and max. 130mV for RTQ2539CGQWF). The device supports single input supply voltage as low to 1.1V, which makes it easy to use.
The low-noise, high PSRR and high output current capability makes the RTQ2539C ideal to power noise-sensitive devices such as analog-to-digital converters (ADCs), digital-to-analog converters (DACs), and RF components. With very high accuracy, remote sensing, and soft-start capabilities to reduce inrush current, the RTQ2539C is ideal for powering digital loads such as FPGAs, DSPs, and ASICs.
The external enable control and power good indicator function make the control sequence easier. The output noise immunity is enhanced by adding external bypass capacitor on the NR/SS pin. The device is fully specified over the temperature range of T_J = -40°C to 125°C and is offered in the WQFN-12L 2.2x2.5(FC) and VQFN-20L 3.5x3.5 packages.

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