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TPS63805 Datasheet(PDF) 8 Page - Texas Instruments

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Part # TPS63805
Description  TPS6380x High-Efficiency, Low IQ Buck-Boost Converter with Small Solution Size
PDF  42 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS63805 Datasheet(HTML) 8 Page - Texas Instruments

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9 Detailed Description
9.1 Overview
The TPS63805, TPS63806, and TPS63807 buck-boost converter use four internal switches to maintain
synchronous power conversion at all possible operating conditions. This enables the device to keep high
efficiency over a wide input voltage and output load range. To regulate the output voltage at all possible
input voltage conditions, the device automatically transitions between buck, buck-boost, and boost operation as
required by the operating conditions. Therefore, it operates as a buck converter when the input voltage is higher
than the output voltage, and as a boost converter when the input voltage is lower than the output voltage. When
the input voltage is close to the output voltage, it operates in a 3-cycle buck-boost operation. In this mode, all
four switches are active (see Section 9.4.1.3). The RMS current through the switches and the inductor is kept at
a minimum to minimize switching and conduction losses. Controlling the switches this way allows the converter
to always keep high efficiency over the complete input voltage range. The device provides a seamless transition
between all modes.
9.2 Functional Block Diagram
EN
MODE
VIN
L2
L1
GND
VOUT
AGND
PG
FB
CIN
COUT
L
Gate
Driver
Gate
Driver
+
±
Ref
1.1 V
Device Control
Power Safe Mode
Protection
Current Limit
Buck/Boost Control
Off-time calculation
Soft-Start
+
±
Ref
500 mV
+
±
VMAX Switch
VIN
VOUT
Device
Control
Current
Sensor
Gate
Driver
VIN
VOUT
L1, L2
Power
Good
Device
Control
Device
Control
TPS63805, TPS63806, TPS63807
SLVSDS9E – JULY 2018 – REVISED AUGUST 2021
www.ti.com
8
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Copyright © 2021 Texas Instruments Incorporated
Product Folder Links: TPS63805 TPS63806 TPS63807



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