AMG-PU005 Datasheet, PDF (5/14 Pages) alpha microelectronics gmbh – Analog System Base Chip, I/O PowerStage, OP-Amps

AMG-PU005
Analog System Base Chip, I/O PowerStage, OP-Amps
5. Block Descriptions
5.1. Output Control - Logic Table
Inputs
Outputs
IN1
IN2
IN3
IN4
LS
HS
LD1
LD2
1
ON
0
OFF
1
ON
0
OFF
1
ON
0
OFF
1
ON
0
OFF
5.2. Over Current Protection (OCP) Block
The OCP block prevents the N- and P-Driver open drain outputs from driving disruptive
currents.
5.3. Level Shifter (LS)
Internal level shifter to translate switching signals from the low voltage domain to the high
voltage domain. It is dedicated to drive the open drain P-Driver gate.
5.4. High Voltage Power Supply (HVPS)
The HVPS supplies the level shifter block with the high voltage needed to drive the open drain
P-Driver gate. It supplies even the N-Driver's protection circuit and the buck regulator's driver
stage.
5.5. Under Voltage Lock Out (UVLO)
The UVLO block detects under-voltage events on VDD and disables the outputs in case of
such event. This prevents the IC from under-voltage driven malfunctions.
5.6. Over-Temperature Protection Block (Temp)
The Temp block prevents the IC from thermal overload. In case of such overload the outputs
will be switched off.
5.7. Buck Regulator
This block allows to build an efficient step-down DC-DC converter. Depending on the load it
supports continuous current mode, discontinuous current mode and cycle skipping mode. The
Buck Regulator is over-current and short circuit protected.
AMG-PU005 Revision: B
9. Nov. 2012
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