ACPM-5251
4x5 UMTS Band I & Band V Dual-Band Power Amplifier Module
with Integrated Coupler
Data Sheet
Description
Features
The ACPM-5251 is the dual-band power amplifier module
with integrated directional coupler designed for UMTS
Band 1 and Band 5 uplink transmission in the mobile
handsets, data cards or dongles supporting WCDMA and/
or HSPA. This product has been designed, tested and
characterized to the stringent spectral linearity and other
requirements of the 3GPP standards including the HSDPA,
HSUPA and HSPA+ UL transmission while keeping the
key emphasis on the excellent PAE over the entire power
range, i.e. the exceptional average power consumption
and talk-time.
UMTS Band 1 and Band 5 dual-band PA
Integrated directional coupler (daisy-chained between
both bands with single coupled out port and internally
terminated isolation port)
High directivity (small coupled power or delivered
power variation into mismatched load)
3-mode power/gain control (active bypass, mid power,
and high power modes)
Excellent PAE in low and mid power ranges.
3.5mA quiescent current in active bypass (low-power)
mode
The ACPM-5251 contains all of the input and output
matching networks, Vcc decoupling/bypass capacitors,
RF input & output DC blocking capacitors as well as the
daisy-chained directional coupler integrated into the
module substrate PCB, all in a single 14-pad surface-
mount leadless package with 4x5 mm from factor and
1mm thickness.
Excellent average power consumption and talk-time
Spectral linearity supporting HSDPA, HSUPA, and HSPA+
Internally matched 50Ω RF input & output ports
Internal RF input & output DC blocking capacitors
Internal Vcc bypass capacitors
Internal Vref eliminating external LDO regulators and
The integrated directional coupler has a single coupled-
out port and is daisy-chained between the both bands
with internally 50-terminated isolation port. It also has
excellent coupler directivity in both bands allowing small
coupled out power variation or delivered power variation
caused by the load mismatch from the antenna. The
coupler directivity, i.e. the power variation into the mis-
matched load is critical to the TRP performance of the
mobile phones in the real operation as well as the spec.
compliance test.
switches
1.8V CMOS compatible control logics (VH=1.35V~3.1V)
4 x 5 x 1mm 14-pad leadless surface-mount package
Lead-free, RoHS compliant, Halogen-free, Sb-free, Green
Applications
UMTS Band 1 and Band 5 Uplink Transmission in
WCDMA / HSDPA / HSUPA / HSPA+ handsets, data cards
and dongles
The ACPM-5251 features CoolPAM-5 circuit technology
which supports 3 power/gain modes – active bypass (low
power), mid power, and high power modes. CoolPAM is
the stage bypass technology that enables very lower
power consumption especially in the low and mid output
power ranges. The active bypass technology added in the
CoolPAM-5 further enhances the PAE at low output power
range together with the exceptionally low quiescent
current. It dramatically saves the average power consump-
tion extending the talk time of the phones and battery life
of the other mobile data devices even much longer.
Ordering Information
Part Number
Number of Devices
Container
7”Tape/Reel
Bulk
ACPM-5251-TR1
ACPM-5251-BLK
1000
100
Description (Cont.)
from the baseband chipsets. All of the digital control input
pins such as the Ven, Vmode and Vbp are fully CMOS
compatible down to the 1.8V logic and all they needs just
several uA of current drawn per pin to be driven.
The ACPM-5251 has integrated on-chip Vref and
on-module bias switch as the one of the key features of
the CoolPAM-5, so the external Vref is not required elimi-
nating the external LDO regulators and switches from the
circuit boards of the mobile devices. It also makes the PA
fully digital-controllable by the Ven pin that simply turns
the PA on and off from the digital control logic inputs
The CoolPAM series of power amplifiers are manufactured
on an advanced InGaP HBT technology offering excellent
performance, temperature stability, ruggedness, and
reliability.
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