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 180A 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)
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 45V
RMS
Output Voltage Noise
o
Low 180A Operating Supply Current
o
2.5V to 5.5V Input Voltage Range
o
67dB PSRR
o
10V
P-P
Channel-to-Channel Crosstalk
o
Short-Circuit Protection
o
Thermal-Overload Protection
o
0.01A Shutdown Current
o
Tiny 12-Pin 4mm x 4mm QFN Package
MAX8890
Integrated Cellular RF-Section
Power-Management IC
________________________________________________________________ Maxim Integrated Products
1
Ordering Information
19-2075; Rev 2; 10/02
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.
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" =
V
OUT1
, "y" = V
OUT2
, and "z" = V
OUT3
.
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.
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
Standard Preset Output
Voltage Suffixes
*Nonstandard output voltages between 1.80V and 3.30V are
available in 50mV increments.
ON
OFF
IN1
OUT1
IN2
OUT2
IN3
OUT3
EN1
BP
EN2
EN3
GND
MAX8890
INPUT
OUTPUT #1
OUTPUT #2
OUTPUT #3
Typical Operating Circuit
MAX8890
Integrated Cellular RF-Section
Power-Management IC
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
_ = 3.6V, EN_ = IN_, C
IN
= 6.8F, C
OUT
_ = 2.2F, C
BP
= 0.01F, all ceramic capacitors
T
A
= 0C to +85C
, unless otherwise
noted. Typical values are at T
A
= +25C.)
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Note A:
As long as the maximum continuous power dissipation rating is not exceeded, the output can be shorted indefinitely.
IN_, EN_ to GND.......................................................-0.3V to +6V
OUT_, BP to GND ......................................-0.3V to (V
IN
_ + 0.3V)
Output Short-Circuit Protection (Note A) .......................indefinite
Continuous Power Dissipation (T
A
= +70C)
12-Pin 4 x 4 QFN (derate 16.9mW/C above +70C) .......1349mW
Operating Temperature Range ...........................-40C to +85C
Junction Temperature ......................................................+150C
Storage Temperature Range .............................-65C to +150C
Lead Temperature (soldering, 10s) .................................+300C
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
GENERAL
Input Voltage
V
IN
_
2.5
5.5
V
Input Undervoltage Lockout
Threshold
V
UVLO
Rising and falling edge
2.10
2.25
2.45
V
Input Undervoltage Hysteresis
45
mV
SUPPLY CURRENT
Quiescent Supply Current
I
Q
I
OUT
_ = 0
180
330
A
Shutdown Supply Current
EN_ = OUT_ = GND
0.01
10
A
LINEAR REGULATORS
T
A
= +85
C
-1
+1
Output Voltage Accuracy
V
OUT
_
V
IN
_ = 0.5V + the
highest of
(V
OUT1
, V
OUT2
, or
V
OUT3
),
I
OUT
_ = 1mA to
100mA
T
A
= 0
C +85
C
-2
+2
%
Current Limit
I
LIM
OUT_ = GND
120
250
500
mA
Output Pulldown Resistance
R
OUT
_
EN_ = GND
3
5
8
k
I
OUT
_ = 1mA
1
I
OUT
_ = 50mA
25
Dropout Voltage (Note 1)
V
IN
_ -
V
OUT
_
I
OUT
_ = 100mA
50
100
mV
Line Regulation
V
IN
_ = (V
OUT
_+ 0.1V) to 5.5V for V
OUT
_
2.4V, or V
IN
_ = 2.5V to 5.5V for V
OUT
_ <
2.4V, I
OUT
= 1mA
-0.15
+0.15
%/V
Output Voltage Noise
10Hz to 100kHz, C
OUT
_ = 10F ceramic,
V
OUT
_ = 2.8V, I
OUT
_ = 10mA
45
V
RMS
Output Voltage PSRR
100Hz, C
OUT
_ = 2.2F ceramic,
I
OUT
_ = 10mA
67
dB
Channel-to-Channel Isolation
10kHz, C
OUT
_ = 2.2F ceramic,
I
OUT
_ = 10mA
64
dB
MAX8890
Integrated Cellular RF-Section
Power-Management IC
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS
(V
IN
_ = 3.6V, EN_ = IN_, C
IN
= 6.8F, C
OUT
_ = 2.2F, C
BP
= 0.01F, all ceramic capacitors
T
A
= -40C to +85C
, unless otherwise
noted.) (Note 2)
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
_ = 3.6V, EN_ = IN_, C
IN
= 6.8F, C
OUT
_ = 2.2F, C
BP
= 0.01F, all ceramic capacitors
T
A
= 0C to +85C
, unless otherwise
noted. Typical values are at T
A
= +25C.)
Note 1:
The dropout voltage is defined as V
IN
_ - V
OUT
_, when V
OUT
_ is 100mV below the set output voltage (the value of V
OUT
_ for
V
IN
_ = V
OUT
_ + 500mV). Since the minimum input voltage range is 2.5V, this specification is only meaningful when the set
output voltage exceeds 2.7V (V
OUT_(NOM)
2.7V).
Note 2:
Specifications to -40C are guaranteed by design, not production tested.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
ENABLE LOGIC CONTROL
EN_ Input Threshold
V
EN
_
2.5V
V
IN
_
5.5V
0.4
1.6
V
EN_ Input Bias Current
I
EN
_
V
EN
_ = 5.5V or 0, T
A
= +85
C
-1
+1
A
THERMAL PROTECTION
Thermal-Shutdown Temperature
T
SHDN
Rising temperature
160
C
Thermal-Shutdown Hysteresis
T
SHDN
15
C
PARAMETER
SYMBOL
CONDITIONS
MIN
MAX
UNITS
GENERAL
Input Voltage
V
IN
_
2.5
5.5
V
Input Undervoltage Lockout
Threshold
V
UVLO
Rising and falling edge
2.10
2.45
V
SUPPLY CURRENT
Quiescent Supply Current
I
Q
I
OUT
_ = 0
330
A
Shutdown Supply Current
EN_ = OUT_ = GND
10
A
LINEAR REGULATORS
Output Voltage Accuracy
V
OUT
_
V
IN
_ = 0.5V + the highest of (V
OUT1
, V
OUT2
,
or V
OUT3
), I
OUT
_ = 1mA to 100mA
-2
+2
%
Current Limit
I
LIM
OUT_ = GND
110
500
mA
Output Pulldown Resistance
R
OUT
_
EN_ = GND
3
8
k
Dropout Voltage
V
IN
_ -
V
OUT
_
I
OUT
_ = 100mA (Note 1)
100
mV
Line Regulation
V
IN
_ = (V
OUT
_+ 0.1V) to 5.5V for V
OUT
_
2.4V, or V
IN
_ = 2.5V to 5.5V for V
OUT
_ <
2.4V, I
OUT
= 1mA
-0.15
+0.15
%/V
ENABLE LOGIC CONTROL
EN_ Input Threshold
V
EN
_
2.5V
V
IN
_
5.5V
0.4
1.6
V
EN_ Input Bias Current
I
EN
_
V
EN
_ = 5.5V or 0, T
A
= +85
C
-1
+1
A
MAX8890
Integrated Cellular RF-Section
Power-Management IC
4
_______________________________________________________________________________________
Typical Operating Characteristics
(Circuit of Figure 1, MAX8890ETCGGG, V
IN
= 3.3V, EN_ = IN_, T
A
= +25C, unless otherwise noted.)
0
1.0
0.5
2.0
1.5
2.5
3.0
0
2
3
1
4
5
6
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
MAX8890 toc01
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
I
OUT
= NO LOAD
2.77
2.79
2.78
2.81
2.80
2.82
2.83
0
40
60
20
80
100
OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX8890 toc02
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
2.77
2.79
2.78
2.81
2.80
2.82
2.83
-40
10
35
-15
60
85
OUTPUT VOLTAGE
vs. TEMPERATURE
MAX8890 toc03
TEMPERATURE (
C)
OUTPUT VOLTAGE (V)
I
OUT
= 100mA
0
20
10
40
30
60
50
70
0
40
20
60
80
100
DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX8890 toc04
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
T
A
= -40
C
T
A
= +25
C
T
A
= +85
C
0
60
40
20
80
100
120
140
160
180
200
0
2
1
3
4
5
6
GROUND-PIN CURRENT
vs. INPUT VOLTAGE
MAX8890 toc05
INPUT VOLTAGE (V)
GROUND-PIN CURRENT (
A)
I
OUT
= NO LOAD
I
OUT1
= 100mA
ONLY ONE OUTPUT ENABLED
(EN1 = IN, EN2 = EN3 = GND)
50
65
60
55
70
75
80
85
90
95
100
0
40
20
60
80
100
GROUND-PIN CURRENT
vs. LOAD CURRENT
MAX8890 toc06
LOAD CURRENT (mA)
GROUND-PIN CURRENT (
A)
ONLY ONE OUTPUT ENABLED
(EN1 = IN, EN2 = EN3 = GND)
50
70
60
90
80
110
100
120
-40
10
-15
35
60
85
GROUND-PIN CURRENT
vs. TEMPERATURE
MAX8890 toc07
TEMPERATURE (
C)
GROUND-PIN CURRENT (
A)
I
OUT1
= 100mA
ONLY ONE OUTPUT ENABLED
(EN1 = IN, EN2 = EN3 = GND)
80
70
60
50
40
30
20
10
0
0.01
1
10
0.1
100
1000
POWER-SUPPLY REJECTION RATIO
MAX8890 toc08
FREQUENCY (kHz)
PSRR (dB)
C
IN
= 1
F + 0.1
F
I
OUT
= 10mA
80
70
60
50
40
30
20
10
0
0.1
10
100
1
1000
CHANNEL-TO-CHANNEL ISOLATION
MAX8890 toc09
FREQUENCY (kHz)
ISOLATION (dB)
LOW-IMPEDANCE INPUT
I
OUT1
= 100mA SINUSOIDAL LOAD
I
OUT3
= 10mA
MAX8890
Integrated Cellular RF-Section
Power-Management IC
_______________________________________________________________________________________
5
20
s/div
LOAD TRANSIENT
A
B
MAX8890 toc10
A. I
OUT
_ = 1mA to 100mA, 50mA/div
B. V
OUT
_ = 2.8V, 20mV/div
V
IN
= 3.3V (V
OUT
_ +500mV)
20
s/div
LOAD TRANSIENT NEAR DROPOUT
A
B
MAX8890 toc11
A. I
OUT
_ = 1mA to 100mA, 50mA/div
B. V
OUT
_ = 2.8V, 20mV/div
V
IN
= 2.9V (V
OUT
_ + 100mV)
40
s/div
LINE TRANSIENT RESPONSE
A
B
MAX8890 toc12
A. V
IN
= 3.5V to 4.0V, 200mV/div
B. V
OUT_
= 2.8V, 2mV/div
I
OUT
= 100mA
4.0V
3.5V
2.8V
5ms/div
STARTUP WAVEFORM
(C
BP
= 0.1
F)
A
C
B
MAX8890 toc15
A. V
IN
= 0 to 3.3V, 5V/div
B. V
OUT
_ = 2.8V, 2V/div
C. V
BP
= 1.25V, 1V/div
R
OUT
_ = 28
(100mA)
20
s/div
STARTUP WAVEFORM
(C
BP
= 0.01
F)
A
C
B
MAX8890 toc14
A. V
IN
= 0 to 3.3V, 5V/div
B. V
OUT_
= 2.8V, 2V/div
C. V
BP
= 1.25V, 1V/div
R
OUT
_ = 28
(100mA)
1000
1
0.1
10
100
1000
CROSSTALK VOLTAGE
10
100
MAX8890 toc13
FREQUENCY (kHz)
CROSSTALK (
Vp-p)
1
LOW-IMPEDANCE INPUT
I
OUT1
= 100mA SINUSOIDAL LOAD
I
OUT3
= 10mA
Typical Operating Characteristics (continued)
(Circuit of Figure 1, MAX8890ETCGGG, V
IN
= 3.3V, EN_ = IN_, T
A
= +25C, unless otherwise noted.)
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