Texas Instruments TPS65820 Evaluation Module TPS65820EVM TPS65820EVM Datenbogen
Produktcode
TPS65820EVM
LINEAR REGULATORS — FUNCTIONAL DESCRIPTION
Simplified Block Diagram
SHORT CIRCUIT
PROTECTION
BIAS
CONTROL
LDO3-5 ONLY
DISCHARGE
CONTROL
LDO1, LDO2,
LDO3-5 ONLY
VREF
+
_
INPUT SUPPLY
OUTPUT
VOLTAGE
SETTING
Programmable
LDOs only
ON/OFF
CONTROL
All LDOs
except
LDO_PM
DISCHARGE
CONTROL
ENABLE
LDO1, LDO2,
LDO3-5 ONLY
I2C
REGISTERS
OUTPUT VOLTAGE
OUTPUT
CURRENT
SAMPLE
OUTPUT
VOLTAGE
SAMPLE
Connecting the LDO Input Supply
ON/OFF Control
Output Discharge Switch
Special Functions
SLVS663B – MAY 2006 – REVISED APRIL 2008
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The TPS65820 offers nine Integrated Linear Regulators, designed to be stable over the operating load range
with use of external ceramic capacitors, as long as the recommended filter capacitor values (see application
diagram and pinout description) are used. The output voltage can be programmed via I
with use of external ceramic capacitors, as long as the recommended filter capacitor values (see application
diagram and pinout description) are used. The output voltage can be programmed via I
2
C (LDO0-2, LDO3-5) or
have a fixed output voltage.
A simplified block diagram for the LDOs is shown in
Figure 40. Simplified Block Diagram
Both LDO1-2 and LDO3-5 have uncommitted input power supply pins (VIN_LDO12, VIN_LDO35), which should
be externally connected to the OUT pin. Optionally the LDO0-2 and LDO3-5 input supplies can be connected to
the output of the available buck converters SM1 or SM2, as long as the resulting overall power-up sequence
meets the system requirements.
be externally connected to the OUT pin. Optionally the LDO0-2 and LDO3-5 input supplies can be connected to
the output of the available buck converters SM1 or SM2, as long as the resulting overall power-up sequence
meets the system requirements.
The RTC_OUT, SIM, LDO0 and LDO_PM linear regulators are internally connected to the OUT pin.
All the LDO’s, with exception of LDO_PM LDO, have a ON/OFF control which can be set via I
2
C commands,
facilitating host management of the distinct system power rails. The LDO_PM LDO On/OFF control is internally
hard-wired, and it is set to ON when either AC or USB input power is detected.
hard-wired, and it is set to ON when either AC or USB input power is detected.
LDO1, LDO2 AND LDO3-5 have integrated switches that discharge each output to ground when the LDO is set
to OFF by an I
to OFF by an I
2
C command. The output discharge switch function can be disabled by using I
2
C register control
bits. The discharge switches are enabled after the initial power-up
The RTC_OUT, SIM (Subscriber line interface module) and LDO_PM linear regulators are designed to support
lower load currents. The SIM and RTC_LDO have low leakage in OFF mode, with the input pin voltage above or
below the output pin voltage. The LDO_PM can be used for USB enumeration, or a status indication of input
power connection.
lower load currents. The SIM and RTC_LDO have low leakage in OFF mode, with the input pin voltage above or
below the output pin voltage. The LDO_PM can be used for USB enumeration, or a status indication of input
power connection.
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