DA9130 datasheet(17/46 Pages) RENESAS

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DA9130

High-Performance, 10 A, Dual-Phase DC-DC

Converter for Mobile and Portable Applications

Datasheet

Revision 2.1

14-Apr-2022

CFR0011-120-00

17 of 45

Functional Description

4.1

DC-DC Buck Converter

DA9130 operates as a single-channel dual-phase buck converter capable of delivering up to 10 A

output current at a 0.3 V to 1.9 V output voltage range.

The buck converter has two voltage registers. One defines the normal output voltage, while the other

offers an alternative retention voltage. In this way, different application power modes can easily be

supported. The voltage selection can be operated either via GPI or via control interface to guarantee

the maximum flexibility according to the specific host processor status in the application.

When a buck is enabled, its output voltage is monitored and a power good signal indicates that the

buck output voltage has reached a level higher than the VTHR_PG_HYS threshold. The power good

status is lost when the voltage drops below VTHR_PG_DWN or increases above VTHR_HV. The status of the

power good indicator can be read back via I2C from the PG1 status bit. It can be also individually

assigned to any of the GPIOs by setting the GPIO mode registers to PG1 output.

The buck converter is capable of supporting DVC transitions that occur when:

● the active and selected A- or B-voltage is updated to a new target value

● the voltage selection is changed from the A- to B-voltage (or B- to A-voltage) using CH1_VSEL

The DVC controller operates in pulse width modulation (PWM) mode with synchronous rectification.

The slew rate of the DVC transition is programmed at 10 mV per 8 µs, 4 µs, 2 µs, 1 µs, or 0.5 µs in

A pull-

down resistor (typically 150 Ω) for each phase is always activated unless it is disabled by

setting register bits CH1_PD_DIS to 1.

4.1.1

Switching Frequency

The buck switching frequency, nominally 4 MHz, can be tuned using register bit OSC_TUNE. The

internal 8 MHz oscillator frequency is tuned in ±160 kHz steps. This impacts the buck converter

frequency in steps of 80 kHz and helps to mitigate possible disturbances to other high frequency

systems in the application.

4.1.2

Operation Modes and Phase Selection

The buck converters can operate in PWM and PFM modes. The operating mode is selected using

Phase shedding automatically changes between 1- and 2-phase operation at a typical current of

2.0 A.

If the automatic operation mode is selected on CH1_<A or B>_MODE, the buck converter

automatically changes between synchronous PWM mode and PFM depending on the load current.

This improves the efficiency across the whole range of output load currents.

4.1.3

Output Voltage Selection

The switching converter can be configured using the I2C interface.

Two output voltages can be pre-configured in registers CH1_<A or B>_VOUT. The output voltage

can be selected by either toggling register bit CH1_VSEL or by re-programming the selected voltage

control register. Both changes will result in ramped voltage transitions. After being enabled, the buck

converter will, by default, use the register settings in CH1_A_VOUT unless the output voltage

selection is configured via the GPI port.

Registers CH1_VMAX limit the output voltage that can be set for each of the respective buck

converters.

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