MAX1727 Datasheet, PDF (1/15 Pages) Maxim Integrated Products – GSM Cellular/PCN Handset RF Power Management IC

19-1489; Rev 0; 12/00
GSM Cellular/PCN Handset RF Power
Management IC
General Description
The MAX1727 is a radio frequency (RF) power-man-
agement IC intended for Global Satellite Mobile (GSM)
communication cellular and personal cellular network
(PCN) handsets using a single lithium-ion (Li+) cell bat-
tery with inputs from +3.1V to +5.5V. The IC contains
four low-noise, low-dropout (LDO) linear regulators to
provide all the supply voltage requirements for the RF
portion of the handset, and two high-speed, wide-band-
width op amps for the power amplifier (PA) power con-
trol loop.
Each LDO has its own individual on/off control to maxi-
mize design flexibility. All LDOs are internally trimmed
to a fixed output voltage and are optimized for low
noise and high crosstalk isolation. LDO1 (R1OUT) is
rated for 100µA and is optimized for lowest quiescent
current. It is intended to power the transmitter, receiver,
and synthesizer. LDO2 (R2OUT) is rated for 50mA. It is
intended to power the TCXO, GSM, and PCN high-
power voltage-controlled oscillators (VCOs). LDO3
(R3OUT) is rated for 20mA and is optimized to sup-
press line transients. It is intended to power the UHF
offset VCO. LDO3 has an auxiliary 2.5Ω switched out-
put to allow the VCO to be powered up with precise
timing. LDO4 (R3BYP) is rated for 20mA. It is intended
to power this IC’s reference and LDO3 for superior line
rejection. LDO4 and the reference will be powered on if
any of the R1EN, R2EN, and R3EN enable inputs are
logic high.
The op amps have wide bandwidth, high DC accuracy,
high slew rate, and Rail-to-Rail^® inputs and outputs.
The op amps can sink and source 3mA, and include
two 2.5Ω switched outputs. The op amps and switched
outputs may be used independently or may be config-
ured to provide optimized power for a PA control loop.
Applications
GSM Cellular or PCN Handsets
Single-Cell Li+ Systems
3-Cell NiMH, NiCD, or Alkaline Systems
Typical Application Circuit and Functional Diagram appear
at end of data sheet.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
Features
o +3.1V to +5.5V Input Range
o One 2.90V, 100mA Low IQ LDO
o One 2.75V, 50mA Low IQ LDO
o One 2.75V, 20mA Low IQ LDO
o Low-Noise LDOs
<90µV_RMS from 10Hz to 100kHz
>80dB Crosstalk Isolation at 10kHz
>70dB PSRR at 1kHz
o ±5% Accuracy Over Line, Load, and Temperature
o Three 2.5Ω Switched Outputs
o Current and Thermal Limit
o Two Undedicated Op Amps
Rail-to-Rail CMR Inputs and Outputs
>120dB Channel Separation
>85dB PSRR at 1kHz
o 10µA (max) Shutdown Current
PART
MAX1727EUG
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
24 TSSOP
Pin Configuration
R3EN 1
PCEN 2
PC1+ 3
PC1- 4
PC1OUT 5
V_PC 6
PC2OUT 7
PC2- 8
PC2+ 9
PCNAPC 10
BANDSWIN 11
GSMAPC 12
MAX1727
TSSOP
24 GND
23 CBYP
22 ENVCO
21 VCOOUT
20 R3OUT
19 R3BYP
18 R1OUT
17 V_CC
16 R2OUT
15 R2EN
14 R1EN
13 GSM/PCN
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