DA9233 datasheet(25/50 Pages) RENESAS

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DA9233

Integrated Ultra-Low Quiescent Current, Ultra-Low

Output Ripple Buck Regulator with 100 mA LDO

Datasheet

Revision 2.2

13-Jun-2023

CFR0011-120-00 Rev 5

25 of 50

10.4.8

Automatic Output voltage Discharge

To speed up the discharging of buck output capacitor and ensure a safer start-up next time, the buck

regulator provides automatic output voltage discharge when IC_EN is pulled low or buck shutdown

caused by any fault. Automatic output discharge when buck is forced OFF by fault needs to set

BUCK_EN = 0 needs to set register bit BUCK_PD_CFG2 = 0. The output of the buck regulator is

discharged through VBUCK_SNS pin and an internal buck output discharge FET with typical 33

Ω

resistance.

10.4.9

Event Flag and Fault Control

DA9233 has the flexibility for customers to control the behavior of buck/LDO when there is a fault

condition. There are five register bits (UVLO_FRC_DIS, TSD_FRC_DIS, OV_DIS_BUCK,

OC_BUCK_EVENT, SC_DIS_BUCK ) controlling whether the buck/LDO will be disabled when the

corresponding fault condition happens. In addition, users can choose whether to mask or unmask the

event flag when the fault condition happens.

When there is a VDD Under-voltage condition, both BUCK and LDO will be forced OFF if

UVLO_FRC_DIS = 1. Buck and LDO will remain alive if UVLO_FRC_DIS = 0. During the VDD

Under-voltage condition, the event register bit VIN_UV_EVENT = 1 if the corresponding mask

When there is an Over-Temperature fault inside the device, both buck and LDO will be forced OFF if

TSD_FRC_DIS = 1. If TSD_FRC_DIS = 0, buck and LDO will remain alive. During the over-

temperature condition, the event register bit OT_EVENT = 1.

When there is an over-voltage fault at buck output, buck will be forced OFF if OV_DIS_BUCK = 1.

Buck will continue switching if OV_DIS_BUCK = 0. During the fault, OV_BUCK_EVENT is set to 1 if

M_OV_BUCK_EVENT = 0 otherwise OV_BUCK_EVENT = 0.

When the over-current condition in buck persists for 64 µs and M_OC_BUCK_EVENT is set to 0,

OC_BUCK_EVENT will be set to 1. If OC_DIS_BUCK = 1, BUCK is forced disabled. If

OC_DIS_BUCK = 0, buck will continue switching during the over-current condition.

When there is a buck Output under-voltage condition and M_UV_BUCK_EVENT = 0,

UV_BUCK_EVENT is set to 1. If both buck output under-voltage and over-current condition exist and

SC_DIS_BUCK = 1, buck will be forced OFF. If SC_DIS_BUCK = 0, buck will continue switching

without shutting down by the under-voltage protection.

DA9233 also has a fault recovery mechanism that can be customized through the 3-bits

RCVRY_NUM. This value determines the fault recovery trial number for buck and is counted down

by every fault that triggers buck OFF. When RCVRY_NUM reaches 0, recovery trial is ended and

buck will remain OFF even if the buck enable signals are toggled HI. If RCVRY_NUM is set to 0x7,

there will be no count down on the recovery trial number and recovery trail will not be ended. Before

RCVRY_NUM reaches 0, buck will be recovered automatically if the fault condition disappears.

Event flags are not automatically cleared when the fault conditions disappear. They have to be

cleared by changing the values in register EVENT through I2C.

DA9233 Datasheet(PDF) 25 Page - Renesas Technology Corp

DA9233 Datasheet(HTML) 25 Page - Renesas Technology Corp

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