MAX8890 MAXIM [Maxim Integrated Products], MAX8890 Datasheet

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MAX8890

Manufacturer Part Number
MAX8890
Description
Integrated Cellular RF-Section Power-Management IC
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet

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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
with a metal pad on the underside.
19-2075; Rev 2; 10/02
*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.
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.
SUFFIX
D
G
A
B
F
Cellular Handsets
Single-Cell Li+ Systems
3-Cell NiMH, NiCD, or Alkaline Systems
Personal Digital Assistants (PDAs)
VOLTAGE (V)
OUTPUT
3.30
3.00
2.90
2.85
2.80
Standard Preset Output
________________________________________________________________ Maxim Integrated Products
General Description
Voltage Suffixes
SUFFIX
M
H
K
L
J
4mm QFN package
Applications
VOLTAGE (V)
Integrated Cellular RF-Section
OUTPUT
2.75
2.70
2.50
2.00
1.80
*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” =
V
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.
Power-Management IC
MAX8890ETCxyz* -40 C to +85 C
OUT1
Three 100mA Low-Dropout Linear Regulators
Low 50mV Dropout Voltage at 100mA
±1% Output Voltage Accuracy Over Temperature
Preset 1.8V to 3.3V Output Voltages
(in 50mV Increments)
Low 45µV
Low 180µA Operating Supply Current
2.5V to 5.5V Input Voltage Range
67dB PSRR
10µV
Short-Circuit Protection
Thermal-Overload Protection
0.01µA Shutdown Current
Tiny 12-Pin 4mm x 4mm QFN Package
, “y” = V
PART
P-P
INPUT
ON
Channel-to-Channel Crosstalk
OFF
RMS
OUT2
Typical Operating Circuit
, and “z” = V
Output Voltage Noise
TEMP RANGE
IN1
IN2
IN3
EN1
EN2
EN3
Ordering Information
MAX8890
OUT3
OUT1
OUT2
OUT3
GND
BP
.
PIN PACKAGE
12 (4mm x 4mm) QFN
Features
OUTPUT #1
OUTPUT #2
OUTPUT #3
1

Related parts for MAX8890

MAX8890 Summary of contents

Page 1

... 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 with a metal pad on the underside. Cellular Handsets ...

Page 2

Integrated Cellular RF-Section Power-Management IC ABSOLUTE MAXIMUM RATINGS IN_, EN_ to GND.......................................................-0.3V to +6V OUT_ GND ......................................-0. Output Short-Circuit Protection (Note A) .......................indefinite Continuous Power Dissipation (T = +70°C) A 12-Pin QFN (derate ...

Page 3

ELECTRICAL CHARACTERISTICS (continued 3.6V, EN_ = IN_ 6.8µ noted. Typical values are +25°C.) A PARAMETER SYMBOL ENABLE LOGIC CONTROL EN_ Input Threshold EN_ Input Bias Current THERMAL PROTECTION Thermal-Shutdown ...

Page 4

... Integrated Cellular RF-Section Power-Management IC (Circuit of Figure 1, MAX8890ETCGGG, V OUTPUT VOLTAGE vs. INPUT VOLTAGE 3.0 2.5 2.0 1.5 1.0 0 LOAD OUT INPUT VOLTAGE (V) DROPOUT VOLTAGE vs. LOAD CURRENT + + - 100 LOAD CURRENT (mA) GROUND-PIN CURRENT vs ...

Page 5

... Figure 1, MAX8890ETCGGG, V LOAD TRANSIENT MAX8890 toc10 s/div 1mA to 100mA, 50mA/div OUT 2.8V, 20mV/div OUT +500mV) IN OUT CROSSTALK VOLTAGE 1000 LOW-IMPEDANCE INPUT I = 100mA SINUSOIDAL LOAD OUT1 I = 10mA OUT3 100 100 1000 FREQUENCY (kHz) _______________________________________________________________________________________ Integrated Cellular RF-Section ...

Page 6

... Integrated Cellular RF-Section Power-Management IC (Circuit of Figure 1, MAX8890ETCGGG, V ENABLE WAVEFORM (1ST OUTPUT) 20 s/div 3.3V, 5V/div EN1 2.8V (100mA), 2V/div OUT1 OUT1 1.25V, 1V/div 200mA/div 3.3V, EN2 = EN3 = GND PIN NAME Regulator 1 Input. Supply voltage can range from 2.5V to 5.5V. Bypass with a capacitor to GND (see ...

Page 7

... Furthermore, the MAX8890’s input voltage range of 2.5V to 5.5V is per- fect for single-cell Li+ battery or 3-cell NiMH battery applications. As illustrated in Figure 2, each regulator consists of an error amplifier, internal feedback resistive-divider, and P-channel MOSFET pass transistor ...

Page 8

... V Connect EN_ to IN_ for normal operation. EN_ can be pulled as high as 6V, regardless of the input and output voltages. Thermal-overload protection limits the MAX8890’s total power dissipation in the event of fault conditions. Each linear regulator has its own thermal-shutdown circuitry. OUT1 ...

Page 9

... Applications Information Capacitor Selection and Regulator Capacitors are required at each input and each output of the MAX8890 for stable operation over the full load range and full temperature range. Connect a minimum 2.2µF ceramic capacitor between OUT_ and ground to ensure stability and optimum transient response. Use larger 10µ ...

Page 10

... OUT3 IN1 1 IN2 2 MAX8890 OUT2 EN1 EN2 EN3 4 4 QFN 10 ______________________________________________________________________________________ VERSION MAX8890ETCAAA MAX8890ETCDDD MAX8890ETCGGG 9 IN3 MAX8890ETCMMM MAX8890ETCAKM 8 GND MAX8890ETCABK 7 BP TRANSISTOR COUNT: 1472 PROCESS: BiCMOS Standard Versions TOP MARK AABG AABH AABI AABJ AABK AABN Chip Information ...

Page 11

For the latest package outline information www.maxim-ic.com/packages.) PACKAGE OUTLINE 12,16,20,24L QFN THIN, 4x4x0.8 mm PACKAGE OUTLINE 12,16,20,24L QFN THIN, 4x4x0.8 mm ______________________________________________________________________________________ Integrated Cellular ...

Page 12

Integrated Cellular RF-Section Power-Management IC (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) Maxim cannot assume responsibility for use of any circuitry other than circuitry ...

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