Part Number

MAX8890

Description

Integrated Cellular RF-Section Power-Management IC

Manufacture

Maxim

Total Page 12 Pages
PDF Download
Download MAX8890 Datasheet PDF


Features Datasheet pdf 19-2075; Rev 2; 10/02 MAX8890 Integrat ed Cellular RF-Section Power-Management IC General Description The MAX8890 is a power-management IC intended for cel lular handsets using a single lithium-i on (Li+) cell battery with input voltag es from +2.5V to +5.5V. The IC contains three identical, low-noise, low-dropou t (LDO) linear regulators to provide al l of the supply voltage requirements fo r the RF portion of the handset. The fi rst LDO is intended to power the transm itter, receiver, and synthesizer. The s econd LDO is intended to power the TCXO , and high-power voltage-controlled osc illators (VCOs). The third LDO is inten ded to power the UHF offset VCO. Each L DO has its own individual enable (ON.
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MAX8890 Datasheet
19-2075; Rev 2; 10/02
Integrated Cellular RF-Section
Power-Management IC
General Description
The MAX8890 is a power-management IC intended for
cellular handsets using a single lithium-ion (Li+) cell
battery with input voltages from +2.5V to +5.5V. The IC
contains three identical, low-noise, low-dropout (LDO)
linear regulators to provide all of the supply voltage
requirements for the RF portion of the handset.
The first LDO is intended to power the transmitter,
receiver, and synthesizer. The second LDO is intended
to power the TCXO, and high-power voltage-controlled
oscillators (VCOs). The third LDO is intended to power
the UHF offset VCO.
Each LDO has its own individual enable (ON/OFF) con-
trol to maximize design flexibility. The reference is pow-
ered on if any of the enable inputs (EN1, EN2, EN3) are
logic high. The high-accuracy output voltage of each
LDO is preset at an internally trimmed voltage (1.8V to
3.3V in 50mV increments). Each LDO is capable of sup-
plying 100mA with a low 50mV dropout and is opti-
mized for low noise and high crosstalk-isolation.
Designed with internal P-channel MOSFET pass transis-
tors, the MAX8890’s low 180µA operating supply cur-
rent is independent of load.
Other features include short-circuit and thermal-over-
load protection. The MAX8890 is available in a com-
pact, high-power, 12-pin 4mm 4mm QFN package
with a metal pad on the underside.
Applications
Cellular Handsets
Single-Cell Li+ Systems
3-Cell NiMH, NiCD, or Alkaline Systems
Personal Digital Assistants (PDAs)
Standard Preset Output
Voltage Suffixes
Features
o Three 100mA Low-Dropout Linear Regulators
o Low 50mV Dropout Voltage at 100mA
o ±1% Output Voltage Accuracy Over Temperature
o Preset 1.8V to 3.3V Output Voltages
(in 50mV Increments)
o Low 45µVRMS Output Voltage Noise
o Low 180µA Operating Supply Current
o 2.5V to 5.5V Input Voltage Range
o 67dB PSRR
o 10µVP-P Channel-to-Channel Crosstalk
o Short-Circuit Protection
o Thermal-Overload Protection
o 0.01µA Shutdown Current
o Tiny 12-Pin 4mm x 4mm QFN Package
Ordering Information
PART
TEMP RANGE PIN PACKAGE
MAX8890ETCxyz* -40°C to +85°C 12 (4mm x 4mm) QFN
*Each preset output voltage of these devices is factory
trimmed to one of ten voltages. Replace “xyz” with the letters
corresponding to the desired output voltages (see Standard
Preset Output Voltage Suffixes table), where the three letter
suffix corresponds to the following output voltages: “x” =
VOUT1, “y” = VOUT2, and “z” = VOUT3.
Note: There are five standard versions available (see Standard
Versions table). Sample stock is generally held on standard
versions only. Standard versions have an order increment
requirement of 2500 pieces. Nonstandard versions have an
order increment requirement of 10,000 pieces. Contact the
factory for availability of nonstandard versions.
Typical Operating Circuit
SUFFIX
OUTPUT
VOLTAGE (V)
SUFFIX
OUTPUT
VOLTAGE (V)
A 3.30 H 2.75
B 3.00 J 2.70
D 2.90 K 2.50
F 2.85 L 2.00
G 2.80 M 1.80
*Nonstandard output voltages between 1.80V and 3.30V are
available in 50mV increments.
Standard Versions table and Pin Configuration appear at
end of data sheet.
INPUT
ON
OFF
IN1 OUT1
IN2 OUT2
MAX8890
IN3 OUT3
EN1 BP
EN2
EN3 GND
OUTPUT #1
OUTPUT #2
OUTPUT #3
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.




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