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.
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 45µV
RMS
Output Voltage Noise
o
Low 180µA Operating Supply Current
o
2.5V to 5.5V Input Voltage Range
o
67dB PSRR
o
10µV
P-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
MAX8890
Ordering Information
PART
TEMP RANGE
PIN PACKAGE
12 (4mm x 4mm) QFN
MAX8890ETCxyz* -40°C to +85°C
Applications
Cellular Handsets
Single-Cell Li+ Systems
3-Cell NiMH, NiCD, or Alkaline Systems
Personal Digital Assistants (PDAs)
*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.
Standard Preset Output
Voltage Suffixes
SUFFIX
A
B
D
F
G
OUTPUT
VOLTAGE (V)
3.30
3.00
2.90
2.85
2.80
SUFFIX
H
J
K
L
M
OUTPUT
VOLTAGE (V)
2.75
2.70
2.50
2.00
1.80
Typical Operating Circuit
INPUT
IN1
OUT1
OUTPUT #1
IN2
OUT2
OUTPUT #2
MAX8890
IN3
ON
EN1
OFF
EN2
EN3
GND
BP
OUT3
OUTPUT #3
*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.
________________________________________________________________
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.
Integrated Cellular RF-Section
Power-Management IC
MAX8890
ABSOLUTE MAXIMUM RATINGS
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
= +70°C)
12-Pin 4 x 4 QFN (derate 16.9mW/°C above +70°C) .......1349mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note A:
As long as the maximum continuous power dissipation rating is not exceeded, the output can be shorted indefinitely.
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.
ELECTRICAL CHARACTERISTICS
(V
IN
_ = 3.6V, EN_ = IN_, C
IN
= 6.8µF, C
OUT
_ = 2.2µF, C
BP
= 0.01µF, all ceramic capacitors
T
A
= 0°C to +85°C,
unless otherwise
noted. Typical values are at T
A
= +25°C.)
PARAMETER
GENERAL
Input Voltage
Input Undervoltage Lockout
Threshold
Input Undervoltage Hysteresis
SUPPLY CURRENT
Quiescent Supply Current
Shutdown Supply Current
LINEAR REGULATORS
V
IN
_ = 0.5V + the
highest of
(V
OUT1
, V
OUT2
, or
V
OUT3
),
I
OUT
_ = 1mA to
100mA
OUT_ = GND
EN_ = GND
I
OUT
_ = 1mA
I
OUT
_ = 50mA
I
OUT
_ = 100mA
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
10Hz to 100kHz, C
OUT
_ = 10µF ceramic,
V
OUT
_ = 2.8V, I
OUT
_ = 10mA
100Hz, C
OUT
_ = 2.2µF ceramic,
I
OUT
_ = 10mA
10kHz, C
OUT
_ = 2.2µF ceramic,
I
OUT
_ = 10mA
-0.15
T
A
= +85°C
-1
+1
%
T
A
= 0°C +85°C
-2
120
3
250
5
1
25
50
100
+0.15
%/V
mV
+2
500
8
mA
kΩ
I
Q
I
OUT
_ = 0
EN_ = OUT_ = GND
180
0.01
330
10
µA
µA
V
IN
_
V
UVLO
Rising and falling edge
2.5
2.10
2.25
45
5.5
2.45
V
V
mV
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Output Voltage Accuracy
V
OUT
_
Current Limit
Output Pulldown Resistance
Dropout Voltage (Note 1)
I
LIM
R
OUT
_
V
IN
_ -
V
OUT
_
Line Regulation
Output Voltage Noise
Output Voltage PSRR
Channel-to-Channel Isolation
45
67
64
µV
RMS
dB
dB
2
_______________________________________________________________________________________
Integrated Cellular RF-Section
Power-Management IC
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
_ = 3.6V, EN_ = IN_, C
IN
= 6.8µF, C
OUT
_ = 2.2µF, C
BP
= 0.01µF, all ceramic capacitors
T
A
= 0°C to +85°C,
unless otherwise
noted. Typical values are at T
A
= +25°C.)
PARAMETER
ENABLE LOGIC CONTROL
EN_ Input Threshold
EN_ Input Bias Current
THERMAL PROTECTION
Thermal-Shutdown Temperature
Thermal-Shutdown Hysteresis
T
SHDN
∆T
SHDN
Rising temperature
160
15
°C
°C
V
EN
_
I
EN
_
2.5V
≤
V
IN
_
≤
5.5V
V
EN
_ = 5.5V or 0, T
A
= +85°C
0.4
-1
1.6
+1
V
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX8890
ELECTRICAL CHARACTERISTICS
(V
IN
_ = 3.6V, EN_ = IN_, C
IN
= 6.8µF, C
OUT
_ = 2.2µF, C
BP
= 0.01µF, all ceramic capacitors
T
A
= -40°C to +85°C,
unless otherwise
noted.) (Note 2)
PARAMETER
GENERAL
Input Voltage
Input Undervoltage Lockout
Threshold
SUPPLY CURRENT
Quiescent Supply Current
Shutdown Supply Current
LINEAR REGULATORS
Output Voltage Accuracy
Current Limit
Output Pulldown Resistance
Dropout Voltage
V
OUT
_
I
LIM
R
OUT
_
V
IN
_ -
V
OUT
_
V
IN
_ = 0.5V + the highest of (V
OUT1
, V
OUT2
,
or V
OUT3
), I
OUT
_ = 1mA to 100mA
OUT_ = GND
EN_ = GND
I
OUT
_ = 100mA (Note 1)
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
V
EN
_
I
EN
_
2.5V
≤
V
IN
_
≤
5.5V
V
EN
_ = 5.5V or 0, T
A
= +85°C
-2
110
3
+2
500
8
100
%
mA
kΩ
mV
I
Q
I
OUT
_ = 0
EN_ = OUT_ = GND
330
10
µA
µA
V
IN
_
V
UVLO
Rising and falling edge
2.5
2.10
5.5
2.45
V
V
SYMBOL
CONDITIONS
MIN
MAX
UNITS
Line Regulation
ENABLE LOGIC CONTROL
EN_ Input Threshold
EN_ Input Bias Current
-0.15
+0.15
%/V
0.4
-1
1.6
+1
V
µA
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 -40°C are guaranteed by design, not production tested.
_______________________________________________________________________________________
3
Integrated Cellular RF-Section
Power-Management IC
MAX8890
Typical Operating Characteristics
(Circuit of Figure 1, MAX8890ETCGGG, V
IN
= 3.3V, EN_ = IN_, T
A
= +25°C, unless otherwise noted.)
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
MAX8890 toc01
OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX8890 toc02
OUTPUT VOLTAGE
vs. TEMPERATURE
MAX8890 toc03
3.0
2.5
OUTPUT VOLTAGE (V)
2.0
1.5
1.0
0.5
I
OUT
= NO LOAD
0
0
1
2
3
4
5
6
INPUT VOLTAGE (V)
2.83
2.82
OUTPUT VOLTAGE (V)
2.81
2.80
2.79
2.78
2.77
0
20
40
60
80
2.83
2.82
OUTPUT VOLTAGE (V)
2.81
2.80
2.79
2.78
I
OUT
= 100mA
2.77
100
-40
-15
10
35
60
85
LOAD CURRENT (mA)
TEMPERATURE (°C)
DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX8890 toc04
GROUND-PIN CURRENT
vs. INPUT VOLTAGE
180
GROUND-PIN CURRENT (µA)
160
140
120
100
80
60
40
I
OUT
= NO LOAD
I
OUT1
= 100mA
ONLY ONE OUTPUT ENABLED
(EN1 = IN, EN2 = EN3 = GND)
MAX8890 toc05
GROUND-PIN CURRENT
vs. LOAD CURRENT
95
GROUND-PIN CURRENT (µA)
90
85
80
75
70
65
60
55
50
ONLY ONE OUTPUT ENABLED
(EN1 = IN, EN2 = EN3 = GND)
0
20
40
60
80
100
MAX8890 toc06
70
60
DROPOUT VOLTAGE (mV)
50
40
30
20
10
0
0
20
40
60
80
T
A
= -40°C
T
A
= +25°C
T
A
= +85°C
200
100
20
0
100
0
1
2
3
4
5
6
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
LOAD CURRENT (mA)
GROUND-PIN CURRENT
vs. TEMPERATURE
MAX8890 toc07
POWER-SUPPLY REJECTION RATIO
MAX8890 toc08
CHANNEL-TO-CHANNEL ISOLATION
70
60
ISOLATION (dB)
50
40
30
20
LOW-IMPEDANCE INPUT
I
OUT1
= 100mA SINUSOIDAL LOAD
I
OUT3
= 10mA
0.1
1
10
FREQUENCY (kHz)
100
1000
MAX8890 toc09
120
110
GROUND-PIN CURRENT (µA)
100
90
80
70
60
50
-40
-15
10
35
60
I
OUT1
= 100mA
ONLY ONE OUTPUT ENABLED
(EN1 = IN, EN2 = EN3 = GND)
80
70
60
PSRR (dB)
50
40
30
20
10
0
C
IN
= 1µF + 0.1µF
I
OUT
= 10mA
0.01
0.1
1
10
100
80
10
0
1000
85
TEMPERATURE (°C)
FREQUENCY (kHz)
4
_______________________________________________________________________________________
Integrated Cellular RF-Section
Power-Management IC
MAX8890
Typical Operating Characteristics (continued)
(Circuit of Figure 1, MAX8890ETCGGG, V
IN
= 3.3V, EN_ = IN_, T
A
= +25°C, unless otherwise noted.)
LOAD TRANSIENT
MAX8890 toc10
LOAD TRANSIENT NEAR DROPOUT
MAX8890 toc11
LINE TRANSIENT RESPONSE
MAX8890 toc12
4.0V
A
A
3.5V
A
B
B
2.8V
B
20µs/div
A. I
OUT
_ = 1mA to 100mA, 50mA/div
B. V
OUT
_ = 2.8V, 20mV/div
V
IN
= 3.3V (V
OUT
_ +500mV)
20µs/div
A. I
OUT
_ = 1mA to 100mA, 50mA/div
B. V
OUT
_ = 2.8V, 20mV/div
V
IN
= 2.9V (V
OUT
_ + 100mV)
40µs/div
A. V
IN
= 3.5V to 4.0V, 200mV/div
B. V
OUT_
= 2.8V, 2mV/div
I
OUT
= 100mA
CROSSTALK VOLTAGE
LOW-IMPEDANCE INPUT
I
OUT1
= 100mA SINUSOIDAL LOAD
I
OUT3
= 10mA
CROSSTALK (µVp-p)
100
MAX8890 toc13
STARTUP WAVEFORM
(C
BP
= 0.01µF)
1000
MAX8890 toc14
STARTUP WAVEFORM
(C
BP
= 0.1µF)
MAX8890 toc15
A
A
B
B
10
C
1
0.1
1
10
FREQUENCY (kHz)
100
1000
C
20µs/div
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
_ = 28Ω (100mA)
5ms/div
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
_ = 28Ω (100mA)
_______________________________________________________________________________________
5
京公网安备 11010802033920号
EEWORLD
