Renesas RTKA212831DR0000BU Manual

RTKA212831DR0000BU
The RTKA212831DR0000BU provides a simple
platform to demonstrate the performances of the
RAA212831. The RAA212831 is an integrated 72V
input voltage, 0.5A output load one synchronous buck
regulator with fixed switching frequency from 350kHz
and two 100mA, and 50mA output load linear
regulators LDOs. The buck can support a wide input
voltage range of 14V to 72V and adjusted output
voltage from 1.25V to 24V. The LDO_3V3 can support
a wide input voltage range of 6V to 12V, and the
output voltage is fixed at 3.3V. The LDO_5 can
support a wide input voltage range of 6V to 12V, and
the output voltage is fixed at 5V. It is designed for
small size and high integration electric-bike control
board power management. Integrated buck and
LDOs minimize the system components.
The Buck converter adopts peak current mode
control, providing 500mA current for load and
downstream LDO regulators, while the following
LDOs provide 5V and 3.3V regulated power sources
to the system. The current-mode buck converter
provides a fast transient response and cycle-by-cycle
switching current limit. All output voltages are fixed
internally with few external components.
The RAA212831 has a fixed frequency operation,
even the output terminal is light load condition,
therefore, the switching frequency is fixed during the
load variation. The RAA212831 can also use external
components to achieve standby function to control
buck output voltage as 6V or 12V. When the chip
wants to save more energy with LDOs operations
only, the external component can control buck output
voltage from 12V to 6V.
(a) Without External Standby Function
R16UZ0022EU0101 Rev.1.01
Jun 15, 2022
Features
▪ Buck Converter:
▪ 5V LDO Regulator:
▪ 3.3V LDO Regulator:
Specifications
This board is configured and optimized for the
following operating conditions:
▪ V
▪ VOUT = 6V~12V (For LDOs normal operations)
▪ IOUT_MAX = 0.5A
▪ VLDO_5V = 5V
▪ LDO_5V_MAX = 0.1A
▪ VLDO_3V3 = 3.3V
▪ ILDO_3V3_MAX = 0.05A
Figure 1. Typical Application Diagrams
Demonstration Board Manual
• 4.5V to 72V input voltage
• Adjustable output voltage from 1.25V to 24V
• 500mA output load capability
• 0.6Ω high-side MOSEFT r
• Fixed switching frequency 350kHz operation
• High side OCP, UVP, UVLO, OTP fault protection
• 6V to 12V input voltage
• Fixed output voltage 5V
• 100mA output load capability
• Current limit foldback function
• 6V to 12V input voltage
• Fixed output voltage 3.3V
• 50mA output load capability
• Current limit foldback function
= 14V to 72V (For VOUT is operated at 6V~12V)
IN
(b) with external standby function
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