AL7020S Designer’s Guide
Doc. No. DG_7020B Altec Electronic AG Seite 27 / 32
5.1.3 Power Supply 3.3V (3V Models)
A power supply with 3.3V +/- 5% (3V models) and a minimum power of 1A is strictly
required to supply this module. The supply-regulator should be placed as close to the
module as possible (about 5cm or nearer). To keep a short and low impedance
connection between the regulator and the module is very important when supplying
the module with 3.3V. The 3.3V-trace between regulator and module should be at
least 2.5mm wide or better an entire layer.
Important:
The module draws up to 0.8A max. for 577µs every 4,6ms at GSM transmit level
PCL5 (2W). Therefore a regulator with fast transient response and good load
regulation is strongly recommended.
5.1.4 Preferred Regulators
Preferred fast response regulators:
The following regulators where tested and found to be good.
- MIC29150 Micrel Inc. www.micrel.com
- LP3852 / LP3855 National Semiconductor www.national.com
- LM3940 National Semiconductor www.national.com
- LTC1778 Linear Technology www.linear.com
Peak 0.8 A
Current
Measurement
@ PCL 5
