RICHTEK RTQ2072BAGQVT-QT Evaluation Board Instruction Manual

RICHTEK RTQ2072BAGQVT-QT Evaluation Board Instruction Manual

General Description

The Evaluation Board demonstrates the RTQ2072BAGQVT-QT-11 to be designed with three step down converters and one high PSRR low-dropout (LDO) regulator for automotive camera applications. The high-voltage step down converter is operated with input voltage range up to 18.5V for Power Over Coax (POC) connection. Two low-voltage step down converters provide constant output voltage. All step down converters operate in a forced fixed-frequency PWM mode. The LDO output voltage is easily set via an external resistor. The RTQ2072B provides 10 power sequences by a resistor on SEQ pin for flexibility.

Performance Specification Summary

Summary of the RTQ2072B Evaluation Board performance specificiaiton is provided in Table 1. The ambient temperature is 25°C.

Table 1. RTQ2072B Evaluation Board Performance Specification Summary

Specification| Test Conditions| Min| Typ| Max| Unit
---|---|---|---|---|---
Input Voltage Range| | 4| —| 18.5| V
Buck1 Output Current| | 2| —| —| A
Buck2 Output Current| | 1.5| —| —| A
Buck3 Output Current| | 0.75| —| —| A
LDO Output Current| | 300| —| —| mA
Buck1 Default Output Voltage| | —| 3.6| —| V
Buck2 Default Output Voltage| | —| 1.1| —| V
Buck3 Default Output Voltage| | —| 1.8| —| V
LDO Default Output Voltage| | —| 3.3| —| V
Buck Operation Frequency| | —| 2.1| —| MHz
Buck1 Ripple Voltage| VIN = 6V, VOUT = 3.6V, one switching cycle| —| 20| —| mVpp
Buck2 Ripple Voltage| VIN = 3.6V, VOUT = 1.1V, one switching cycle| —| 10| —| mVpp
Buck3 Ripple Voltage| VIN =3.6V, VOUT = 1.8V, one switching cycle| —| 10| —| mVpp
Buck1 Load Transient Response| VIN = 6V, VOUT = 3.6V, IOUT = 10mA to 500mA,1µs| —| ±150| —| mV
Buck2 Load Transient Response| VIN = 3.6V, VOUT = 1.1V, IOUT = 10mA to500mA, 1µs| —| ±50| —| mV
Buck3 Load Transient Response| VIN = 3.6V, VOUT = 1.8V, IOUT = 10mA to300mA, 1µs| —| ±50| —| mV
LDO Load Transient Response| VIN = 3.6V, VOUT = 3.3V, IOUT = 10mA to200mA, 1µs| —| ±25| —| mV

Power-up Procedure

Suggestion Required Equipments

• RTQ2072B Evaluation Board
• DC power supply capable of at least 20V and 2A (depends on application)
• Electronic load capable of 2A (depends on application)
• Function Generator
• Oscilloscop

Quick Start Procedures
The Evaluation Board is fully assembled and tested. Follow below steps to verify board operation. Do not turn on supplies until all connections are made. When measuring the output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the output voltage ripple by touching the probe tip and ground ring directly across the last output capacitor.

Follow below procedure for proper setup of measurement and EVB operation.

1. With power off state, connect the input power supply to VIN and GND pins.
2. With power off state, connect the electronic load between the VOUT and nearest GND pins.
3. Turn on the power supply at the input. Make sure that the input voltage does not exceeds 24VAMR on the Evaluation Board.
4. Check for the proper output voltage using a voltmeter.
5. Once the proper output voltage is established, adjust the load within the operating ranges and observe the output voltage regulation, ripple voltage, efficiency and other performance

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 below table

is non-connected.
JP2| PG pull high voltage supplied by BUCK3 if short connection. Deafult is connected.
CP4| BUCK2/BUCK3 input voltage supplied by BUCK1 if short connection. Deafult is connected.
CP5| BUCK2/BUCK3 input voltage supplied by VEXT if short connection. Deafult is non-connected.
CP9| LDO input voltage supplied by VEXT if short connection. Deafult is non-connected.
CP10| LDO input voltage supplied by BUCK1 if short connection. Deafult is connected.
GND| Ground.
PG| Power-good indication test point.

Bill of Materials

Reference| Count| Part Number| Description| Package| Manufacturer
---|---|---|---|---|---
U1| 1| RTQ2072BAGQVT-QT-11| PMIC| WETD-VQFN- 16L 3×3| RICHTEK
C1| 1| GCJ31CR71E475KA12| 4.7µF/25V/X7R| 1206| MURATA
C2| 1| GRT188C81C475KE13| 4.7µF/16V/X6S| 0603| MURATA
C3| 1| GRT155R71C104KE01| 0.1µF/16V/X7R| 0402| MURATA
C4, C5, C6| 3| GRT188C81A106ME13| 10µF/10V/X6S| 0603| MURATA
C7| 1| GRT155C81A105KE01| 1µF/10V/X6S| 0402| MURATA
C8, C9| 2| GRT155C81A225KE13| 2.2µF/10V/X6S| 0402| MURATA
L1| 1| TFM201610ALMA1R5MTAA| 1.5µH| 0806| TDK
L2, L3| 2| TFM201610ALMA1R0MTAA| 1µH| 0806| TDK
R1| 1| MR02X1372FAL| 13.7k| 0201| WALSIN
R2| 1| MR02X3921FAL| 3.92k| 0201| WALSIN
R6, R7| 2| MR02X000 PAL| 0| 0201| WALSIN
R8| 1| MR02X1002FAL| 10k| 0201| WALSIN

Typical Applications

EVB Schematic Diagram

1. The capacitance of the input and output capacitors will influence the input and output voltage ripple.
2. MLCC capacitors have degrading capacitance at DC bias voltage and temperature. Especially, smaller size MLCC capacitors will have much lower capacitance.

Measure Result

BUCK1 Efficiency

BUCK1 Load Regulation

BUCK2 Efficiency

BUCK2 Load Regulation

BUCK3 Efficiency

BUCK3 Load Regulation

LDO Load Regulation

LDO Dropout Voltage

LDO PSRR

LDO Output Noise

Power-On

Power-Off

Note: When measuring the input or output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the output voltage ripple by touching the probe tip directly across the output capacitor.

Evaluation Board Layout

Figure 1 to Figure 4 are RTQ2072BAGQVT-QT Evaluation Board layout. This board size is 70mm x 50mm and is constructed on four-layer PCB with 2 oz. Cu

Figure 1. Top View (1st layer)

Figure 2. PCB Layout—Inner Side (2nd Layer)

Figure 3. PCB Layout—Inner Side (3rd Layer)

Figure 4. Bottom View (4th Layer)

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.

References

• Richtek Technology
• Richtek Technology

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