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PDF PM8903 Data sheet ( Hoja de datos )
| Número de pieza | PM8903 | |
| Descripción | 3A step-down monolithic switching regulator | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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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
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1 page  
PM8903
Pin description and connection diagrams
2 Pin description and connection diagrams
Figure 3. Pin connection (top view)
EN
SYNCH
PGOOD
BOOT
16 15 14 13
1 12
2 11
3 10
49
5678
VCC
GND
FB
COMP
2.1
Pin description
Table 2. Pin description
Pin# Name
Function
Enable. Internally pulled up by 5 μA to VCC.
1 EN Force low to disable the device, set free or pull up above turn-on threshold to
enable the converter operations.
Synchronization pin.
According to PSKIP status, the IC sends the synchronization signal out of this
2 SYNCH pin when master, while accepting a synchronization signal when slave.
Connect to the same SYNCH pin of a similar part when synchronizing ICs.
In case of single IC operation, leave floating.
Open drain output set free after SS has finished and pulled low when VOUT is
3 PGOOD out of the PGOOD window or any protection is triggered.
Pull up to a voltage lower than VCC, if not used it can be left floating.
Bootstrap pin.
4 BOOT It provides power supply for the floating high-side driver. Connect with 0.1 μF
to PHASE. See Figure 1.
5 to 7
PHASE
Output inductor connection.
The pins are connected to the embedded MOSFETs (high-side source and
low-side drain). Connect directly to output inductor. See Figure 1.
Doc ID 022748 Rev 1
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5 Page 
PM8903
Electrical specifications
4.4 Typical operating characteristics
(The demonstration board as described in Chapter 7.1 on page 25, RPM=0 Ω, VIN = VCC = 3.3
V, VOUT=1V5, TJ = 25 °C, unless otherwise specified.)
Figure 4. Efficiency vs. output current -
VIN = 3.3 V
Figure 5. Efficiency vs. output current -
VIN = 5 V
Figure 6. Load regulation - VIN = 3.3V
Figure 7. Load regulation - VIN = 5 V
Doc ID 022748 Rev 1
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11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet PM8903.PDF ] | |
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