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PM8903TR Datasheet

3A step-down monolithic switching regulator

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PM8903
3 A step-down monolithic switching regulator
Features
Integrated 35 mΩ MOSFETs for high efficiency
3 A continuous output current
2.8 V to 6 V input voltage (VIN)
2.9 V to 5.5 V supply voltage (VCC)
Adjustable output voltage down to 0.6 V
1% output voltage accuracy
1.1 MHz switching frequency operation
PSKIP mode to optimize light load efficiency
Embedded bootstrap diode
Thermally compensated loss-less current
sense across HS and LS MOSFETs
OV/UV/OC and overtemperature protection
Internal soft-start and soft-stop
Interleaving synchronization (Up to 2 ICs)
Power Good output
Shutdown function (<15 μA quiescent current)
VFQFPN16 3 x 3 mm compact package
Applications
Subsystem power supply
CPU, DSP and FPGA power supply
Distributed power supply
General DC-DC converters
VFQFPN16 3x3 mm
Description
The PM8903 is a high efficiency monolithic step-
down switching regulator designed to deliver up to
3 A continuous current. The IC operates from 2.8
V to 6 V input voltage (VIN).
The PM8903 features low-resistance integrated
nMOS and proprietary pulse-skipping mode for
optimum efficiency over all the loading range.
The voltage mode control loop allows the widest
range of output filter. Current sense is internally
thermally compensated for optimum precision.
The integrated 0.6 V reference allows the
regulation of output voltages with ±1% accuracy
over temperature variations. Switching frequency
is typically set to 1.1 MHz and can be
programmed to 0.8 MHz or 1.0 MHz. Out of phase
synchronization allows the reduction of input RMS
current.
The PM8903 provides precise dual-threshold
overcurrent protection as well as over /
undervoltage and overtemperature protection.
PGOOD output easily provides real-time
information on the output voltage.
Table 1. Device summary
The PM8903 is available in VFQFPN16 3 x 3 mm.
Order codes
Package
Packing
PM8903
PM8903TR
VFQFPN16 3x3 mm
VFQFPN16 3x3 mm
Tube
Tape and reel
February 2012
Doc ID 022748 Rev 1
1/34
www.st.com
34
http://www.Datasheet4U.com


STMicroelectronics Electronic Components Datasheet

PM8903TR Datasheet

3A step-down monolithic switching regulator

No Preview Available !

Contents
Contents
PM8903
1
Typical application circuit and block diagram . . . . . . . . . . . . . . . . . . . . 3
1.1 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Pin description and connection diagrams . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.2 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.4 Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5
Device description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.1 Power section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.2 Startup and shutdown management . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.2.1 Low-side-less startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.2.2 Soft-off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.3 Output voltage monitoring and protection . . . . . . . . . . . . . . . . . . . . . . . . 13
5.3.1 Overvoltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.3.2 Undervoltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.3.3 Feedback disconnection protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.3.4 Power Good (PGOOD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.4 Overcurrent protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.5 Overtemperature protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.6 Synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.7 Pulse-skipping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.8 Multifunction pin PSKIP/MS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.1 Compensation network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2/34
Doc ID 022748 Rev 1
http://www.Datasheet4U.com


Part Number PM8903TR
Description 3A step-down monolithic switching regulator
Maker STMicroelectronics
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PM8903TR Datasheet PDF






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