RICHTEK RTQ2538HN-TA Low Dropout Linear Regulator Evaluation Board User Guide
- June 21, 2024
- RICHTEK
Table of Contents
- RTQ2538HN-TA Low Dropout Linear Regulator Evaluation Board
- Specifications
- Product Usage Instructions
- Power-up & Measurement Procedure
- Test Points:
- Q: What should I do if my output voltage does not match the
- Q: Can I use a power supply with an input voltage higher than
- Q: How can I measure the output ripple voltage accurately?
RTQ2538HN-TA Low Dropout Linear Regulator Evaluation Board
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Specifications
RTQ2538H 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) | 0.8 | |||
| 0.8 | 5.5 | V | |||
| Line Regulation | IOUT = 1mA, 1.1V ≤ VIN ≤ 6.5V | — | 0.05 | — | %/V |
| Load Regulation | 1mA ≤ IOUT ≤ 2A | — | 0.08 | — | %/A |
| Dropout Voltage | VIN = 1.1V to 6.5V, IOUT = 2A, VFB = 0.8V – 3% | — | 34 | 90 | mV |
| Package |
WQFN-12L 2.2×2.5 (FC)
Product Usage Instructions
Power-up & Measurement Procedure
Suggested Equipments:
- RTQ2538H evaluation board
- DC power supply capable of at least 6.5V and 2A
- Electronic load capable of 2A
- 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 ensure that the input voltage does
not exceed 6V. -
Check output voltage regulation with different IOUT for normal
operation.
Notifications:
-
Do not turn on the input power supply before all connections
are ready. -
Avoid using the oscilloscope probe with a long ground lead for
output ripple voltage measurement; it is recommended to touch the
probe tip and ground ring 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 provided Bill of Materials table, ensuring all components
are undamaged and correctly installed. In case of any missing or
damaged component, please contact our distributors or email us at
[email protected].
Test Points:
Frequently Asked Questions (FAQ)
Q: What should I do if my output voltage does not match the
expected values?
A: If the output voltage does not match the
expected values, check the input voltage, load conditions, and
connections to ensure they are within the specified ranges as per
the performance specifications provided in the user manual.
Additionally, verify the components’ integrity and correct
installation on the evaluation board.
Q: Can I use a power supply with an input voltage higher than
6.5V?
A: It is recommended to use a power supply with
an input voltage not exceeding 6.5V to prevent any potential damage
to the RTQ2538H Evaluation Board.
Q: How can I measure the output ripple voltage accurately?
A: To measure the output ripple voltage
accurately, avoid using oscilloscope probes with long ground leads.
Instead, touch the probe tip and ground ring directly across the
last output capacitor for precise measurements.
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| 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. |
your power partner.
RTQ2538HN-TA Evaluation Board
User Guide for RTQ2538H Low Dropout Linear Regulator Evaluation Board
General Description
The RTQ2538H is a high-current, ultra-low noise, ultra low-dropout (LDO)
linear regulator. This document explains the function and use of the RTQ2538H
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
RTQ2538H datasheet.
Table of Contents
General Description ……………………………………………………………………………………………………………………………………1
Performance Specification Summary ……………………………………………………………………………………………………………2
Power-up & Measurement Procedure …………………………………………………………………………………………………………..2
Detailed Description of Hardware …………………………………………………………………………………………………………………3
Bill of Materials…………………………………………………………………………………………………………………………………………..5
Typical Applications ……………………………………………………………………………………………………………………………………6
Evaluation Board Layout……………………………………………………………………………………………………………………………..8 More
Information………………………………………………………………………………………………………………………………………10 Important
Notice for Richtek Evaluation Board……………………………………………………………………………………………..10
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your power partner.
RTQ2538HN-TA Evaluation Board
Performance Specification Summary
The RTQ2538H 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. RTQ2538H 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
0.8 0.8 5.5
V
Line Regulation
IOUT = 1mA, 1.1V VIN 6.5V
— 0.05 — %/V
Load Regulation
1mA IOUT 2A
— 0.08 — %/A
Dropout Voltage
VIN = 1.1V to 6.5V, IOUT = 2A, VFB = 0.8V – 3%
—
34
90 mV
Package
WQFN-12L 2.2×2.5 (FC)
Power-up & Measurement Procedure
Suggestion Required Equipments: RTQ2538H evaluation board DC power supply
capable of at least 6.5V and 2A Electronic load capable of 2A 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.
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your power partner.
Detailed Description of Hardware
Headers Description and Placement
RTQ2538HN-TA Evaluation Board
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 [email protected].
EVB_RTQ2538HN-TA-00 May 2024
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your power partner.
RTQ2538HN-TA Evaluation Board
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.
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your power partner.
Bill of Materials
Reference U1
Count 1
Part Number RTQ2538HN-TA
C3, C6
2
1210X476K160CT
C4, C5
2
0603B104K500CT
C9, C11
2
0603B103K500CT
C10
1
0603B105K250CT
R1
1
RTT031182FTP
R2
1
WR06X3741FTL
R3, R5
2
WR06X1003FTL
RTQ2538HN-TA Evaluation Board
Description
Linear Regulator
Capacitor, Ceramic, 47µF, 16V, X5R
Capacitor, Ceramic, 0.1µF, 50V, X7R
Capacitor, Ceramic, 10nF, 50V, X7R
Capacitor, Ceramic, 1µF, 25V, X5R
Resistor, Chip, 11.8k, 1%
Resistor, Chip, 3.74k, 1%
Resistor, Chip, 100k, 1%
Package WQFN-12L 2.2×2.5 (FC)
C-1210
Manufacturer RICHTEK WALSIN
C-0603
WALSIN
C-0603
WALSIN
C-0603
WALSIN
R-0603
RALEC
R-0603
WALSIN
R-0603
WALSIN
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your power partner.
Typical Applications
EVB Schematic Diagram
GP1
1
VIN
GP2
1
GND
2
1
VIN
1
1
1
C1
C2
C3
C4
2
2
2
EN
U1 1
VIN_1 2
VIN_2 3
EN
11 VOUT_1
10 VOUT_2
9 FB
1
JP1 VIN Enable
1 12 23 3
12
2
4 NR/SS
8 PGOOD
1
R3
C11
5 NC
7 GND_1
1
R4
C10
6 GND_2
12 GND_3
2
12
1
RTQ2538HN-TA Evaluation Board
2
R1
C9
1
R2
2
1
VOUT
1
GP3
VOUT
1
1
1
C5
C6
C7
C8
2
2
2
1
GP4
GND
1
GP5
GND
PGOOD
JP2 PGOOD
1 12 23 3
VIN 1 VOUT
R5 2
PGOOD
VOUT-SENSE1
4
2
4
2
1 1
5 5
3 3
VOUT
VIN-SENSE1
4
2
VIN
4
2
1 1
5 5
3 3
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your power partner.
Measure Result PSRR vs. Frequency and VOUT
Power-Supply Rejection Ratio (dB)
100
VIN = VOUT + 0.3V, IOUT = 2A,
80
COUT = 47mF//10mF//10mF, CNR/SS = 10nF, CFF = 10nF
60
VOUT = 0.8V
40
VOUT = 0.9V
VOUT = 1.1V
VOUT = 1.2V
20
VOUT = 1.5V
VOUT = 1.8V
VOUT = 2.5V
0
10
100
1K
10K
100K
1M
Frequency (Hz)
Output Noise vs. Frequency and VOUT
10
VIN = VOUT + 0.3V, IOUT = 2A,
COUT = 47mF//10mF//10mF,
1
CNR/SS = 10nF, CFF= 10nF
Output Spectral Noise Density (V/Hz)
0.1
0.01
0.001 10
VOUT = 0.8V VOUT = 3.3V VOUT = 5V
100
1K
10K 100K 1M 10M
Frequency (Hz)
Power Up Response
Output Spectral Noise Density (V/Hz)
RTQ2538HN-TA Evaluation Board
Power-Supply Rejection Ratio (dB)
PSRR vs. Frequency and IOUT
100
80
60 IOUT = 0.1A
IOUT = 0.5A
40
IOUT = 1A
IOUT = 2A
20
0 10
VIN = 1.1V, VOUT = 0.8V, COUT = 47mF//10mF//10mF, CNR/SS = 10nF, CFF = 10nF
100
1K
10K
100K
1M
Frequency (Hz)
Output Noise vs. Frequency and CNR/SS
10
1
CNR/SS = 0nF
CNR/SS = 1nF
CNR/SS = 10nF
0.1
CNR/SS = 100nF
0.01
0.001 10
VIN = 1.1V, VOUT = 0.8V, IOUT = 2A, COUT = 47mF//10mF//10mF, CFF = 10nF
100
1K
10K 100K 1M
10M
Frequency (Hz)
Load Transient Response
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your power partner.
Evaluation Board Layout
Figure 1 to Figure 4 are the RTQ2538H evaluation board layout.
RTQ2538HN-TA Evaluation Board
Figure 1. Top View (1st layer)
Figure 2. Inner Side (2nd Layer)
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your power partner.
RTQ2538HN-TA Evaluation Board
Figure 3. Inner Side (3rd Layer)
Figure 4. Bottom View (4th Layer)
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your power partner.
RTQ2538HN-TA Evaluation Board
More Information
For more information, please find the related datasheet or application notes from Richtek website http://www.richtek.com.
Important Notice for Richtek Evaluation Board
THIS DOCUMENT IS FOR REFERENCE ONLY, NOTHING CONTAINED IN THIS DOCUMENT SHALL
BE CONSTRUED AS RICHTEK’S WARRANTY, EXPRESS OR IMPLIED, UNDER CONTRACT, TORT
OR STATUTORY, WITH RESPECT TO THE PRESENTATION HEREIN. IN NO EVENT SHALL
RICHTEK BE LIABLE TO BUYER OR USER FOR ANY AND ALL DAMAGES INCLUDING WITHOUT
LIMITATION TO DIRECT, INDIRECT, SPECIAL, PUNITIVE OR CONSEQUENTIAL DAMAGES.
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