User Guide

LM960 HW Design Guide
1VV0301485 Rev. 3 Page 29 of 74 2018-12-14
Mode Average [Typ.] Mode Description
3DL CA with 4x4
MIMO / 1UL
1200mA
CA_2A-66C, 4x4 MIMO, Full RB, 256QAM DL
/ 64QAM UL (FDD 1.2Gbps DL / 75Mbps UL)
Operative Mode (WCDMA)
WCDMA Voice 750 mA WCDMA voice call (Tx = 23 dBm)
WCDMA HSPA
(22 dBm)
650 mA
WCDMA data call (DC-HSDPA up to 42 Mbps,
Max Throughput)
* Worst/best case current values depend on network configuration - not under module
control.
** Loop-back mode in call equipment
*** 3.3 voltage / room temperature
Information – The electrical design for the power supply must ensure
a peak current output of at least 2A.
General Design Rules
The principal guidelines for the Power Supply Design embrace three different design
steps:
 Electrical design
 Thermal design
 PCB layout
4.3.1. Electrical Design Guidelines
The electrical design of the power supply depends strongly on the power source where
this power is drained.
4.3.1.1. + 5V Input Source Power Supply – Design Guidelines
 The desired output for the power supply is 3.3V. So, the difference between the
input source and the desired output is not big, and therefore a linear regulator can
be used. A switching power supply is preferred to reduce power consumption.
 When using a linear regulator, a proper heat sink must be provided to dissipate the
power generated.
 A bypass low ESR capacitor of adequate capacity must be provided to cut the
current absorption peaks close to the LM960 module. A 100 F tantalum capacitor
is usually suitable on VBATT.
 Make sure that the low ESR capacitor on the power supply output (usually a
tantalum one) is rated at least 10V.
 A protection diode must be inserted close to the power input to protect the LM960
module from power polarity inversion.