MAX8882EUTGG+ [MAXIM]
Fixed Positive LDO Regulator, 2 Output, 3V1, 3V2, BICMOS, PDSO6, LEAD FREE, MINIATURE, SOT-23, 6 PIN;型号: | MAX8882EUTGG+ |
厂家: | MAXIM INTEGRATED PRODUCTS |
描述: | Fixed Positive LDO Regulator, 2 Output, 3V1, 3V2, BICMOS, PDSO6, LEAD FREE, MINIATURE, SOT-23, 6 PIN 稳压器 |
文件: | 总8页 (文件大小:245K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
19-1818; Rev 1; 10/01
Dual, Low-Noise, Low-Dropout, 160mA Linear
Regulators in SOT23
General Description
Features
ꢀ Two LDOs in Tiny SOT23
The MAX8882/MAX8883 dual, low-noise, low-dropout
linear regulators operate from a +2.5V to +6.5V input
and deliver up to 160mA each of continuous current.
Both versions offer low output noise and low dropout of
only 72mV at 80mA. Designed with an internal P-
channel MOSFET pass transistor, the MAX8882/
MAX8883 maintain a low 165µA supply current (both
LDOs on), independent of the load current and dropout
voltage. Other features include short-circuit protection
and thermal-shutdown protection. The MAX8882 has a
single shutdown input and provides an external refer-
ence bypass pin to improve noise performance. The
MAX8883 includes two independent logic-controlled
shutdown inputs. The MAX8882/MAX8883 are both
available in a miniature 6-pin SOT23 package.
ꢀ Up to 160mA Output Current (each LDO)
ꢀ 40µV
Output Noise (MAX8882)
RMS
ꢀ 72mV Dropout at 80mA Load
ꢀ Low 165µA Operating Supply Current
ꢀ 62dB PSRR (greater than 56dB to 100kHz)
ꢀ Independent Low-Power Shutdown Controls
(MAX8883)
ꢀ Thermal-Overload and Short-Circuit Protection
ꢀ Output Current Limit
Selector Guide
PART
V
V
TOP MARK
AANR
AAPW
AARY
OUTA
OUTB
MAX8882EUTJJ
MAX8882EUTAQ
MAX8882EUTA5
MAX8882EUTQ5
MAX8882EUTGG
MAX8883EUTJJ
MAX8883EUTAQ
MAX8883EUTA5
MAX8883EUTQ5
MAX8883EUTGG
2.85
3.3
3.3
2.5
3.0
2.85
3.3
3.3
2.5
3.0
2.85
2.5
1.8
1.8
3.0
2.85
2.5
1.8
1.8
3.0
________________________Applications
µP/DSP Core/IO Power
Cellular and PCS Telephones
PDAs and Palmtop Computers
Notebook Computers
AAPX
AAZT
AANS
AAPY
Digital Cameras
AARZ
Hand-Held Instruments
AAPZ
AAZU
***Other combinations between 1.8V and 3.3V are available in
100mV increments. Contact factory for other versions.
Minimum order quantity is 50,000 units.
Pin Configurations
Ordering Information
TOP VIEW
SHUT-
DOWN
TEMP
RANGE
PIN-
PACKAGE
PART
OUTB
GND
BP
1
2
3
6
5
4
OUTA
IN
MAX8882EUT_ _*
Single
Dual
-40°C to +85°C 6 SOT23-6
-40°C to +85°C 6 SOT23-6
MAX8882
MAX8883EUT_ _*
*See Selector Guide
SHDN
Typical Operating Circuit
SOT23-6
OUTA
V
OUTA
FIXED
V
IN
2.2µF
2.2µF
(1.8V to 3.3V)
2.5V to 6.5V
MAX8882
MAX8883
IN
Pin Configurations continued at end of data sheet.
OUTB
(BP)
V
OUTB
2.2µF
SHDN_
FIXED
(1.8V to 3.3V)
GND
0.01µF
( ) ARE FOR MAX8882 ONLY.
________________________________________________________________ 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.
Dual, Low-Noise, Low-Dropout, 160mA Linear
Regulators in SOT23
ABSOLUTE MAXIMUM RATINGS
IN, SHDN, SHDNA, SHDNB, BP to GND...............-0.3V to +7.0V
OUTA, OUTB to GND ..................................-0.3V to (V + 0.3V)
Output Short-Circuit Duration.....................................Continuous
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
IN
Continuous Power Dissipation (T = +70°C)
A
6-Pin SOT23 (derate 8.7mW/°C above +70°C)............695mW
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 = +3.6V, SHDN = SHDNA = SHDNB = IN, T = -40°C to +85°C, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
IN
A
A
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Input Voltage
2.5
6.5
V
Undervoltage Lockout
Threshold
V
_ rising, hysteresis 40mV typical
2.15
2.25
2.40
V
IN
T = +25°C, I
_ = 1mA
-1
-2
1
2
2
A
OUT
Output Voltage Accuracy
I
I
_ = 1mA
%
OUT
OUT
_ = 100µA to 160mA
-3
Maximum Output Current
Current Limit
Continuous
160
160
mA
mA
550
265
No Load, V = 6.5V
165
170
0.01
0.1
IN
Ground Current
µA
µA
V
I
_ = 80mA, both LDOs
OUT
SHDN_ = GND, T = +25°C
1
A
Shutdown Supply Current
SHDN_ Input Threshold
SHDN_ Input Bias Current
SHDN_ = GND
V
V
1.6
IH
IL
0.4
SHDN_ = GND or IN, T = +25°C
0
0.05
1
100
A
nA
SHDN_ = GND or IN
I
I
I
_ = 1mA
_ = 40mA
_ = 80mA
OUT
OUT
OUT
Dropout Voltage
(Notes 2, 3)
36
72
mV
144
0.2
V
= (V
_ + 0.4V or 2.5V) to + 6.5V,
OUT
IN
Line Regulation
-0.2
0
%/V
I
_ = 1mA
OUT
10Hz to 100kHz, C = 0.01µF, C
_ = 4.7µF,
BP
OUT
MAX8882
_ = 10mA MAX8883
OUT
40
I
_ = 1mA
OUT
Output Voltage Noise
µV
RMS
10Hz to 100kHz, C
_ = 4.7µF, I
320
OUT
2
_______________________________________________________________________________________
Dual, Low-Noise, Low-Dropout, 160mA Linear
Regulators in SOT23
ELECTRICAL CHARACTERISTICS (continued)
(V = +3.6V, SHDN = SHDNA = SHDNB = IN, T = -40°C to +85°C, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
IN
A
A
PARAMETER
CONDITIONS
100Hz, C = 0.01µF, C _ = 4.7µF
MIN
TYP
MAX
UNITS
MAX8882
MAX8883
62
BP
OUT
Output Voltage AC PSRR
dB
100Hz, C
_ = 4.7µF
60
OUT
Thermal Shutdown
Temperature
160
°C
°C
Thermal Shutdown
Hysteresis
10
Note 1: All units are 100% production tested at T = +25°C. Limits over the operating temperature range are
A
guaranteed by design.
Note 2: The dropout voltage is defined as V - V
Note 3: See the Typical Operating Characteristics for guaranteed specifications at voltages other than 3.3V.
when V = V
(NOM). Specification only applies when V
≥ 2.5V.
IN
OUT
IN
OUT
OUT
Typical Operating Characteristics
(V
OUT
_ = 2.85V, I
_ = 80mA, V = +3.6V, C
_ = 2.2µF, C = 0.01µF, and C = 2.2µF, unless otherwise noted.)
OUT
IN
OUT IN
BP
SUPPLY CURRENT
vs. LOAD CURRENT
SUPPLY CURRENT
SUPPLY CURRENT
vs. TEMPERATURE
vs. SUPPLY VOLTAGE
200
200
180
160
140
120
100
80
250
200
150
100
50
180
160
140
120
100
80
80mA LOAD, BOTH OUTPUTS
BOTH OUTPUTS LOADED
80mA LOAD, BOTH OUTPUTS
NO LOAD
60
60
40
40
20
20
0
0
0
0
1
2
3
4
5
6
0
10 20 30 40 50 60 70 80
LOAD CURRENT (mA)
-40
-15
10
35
60
85
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
OUTPUT VOLTAGE ACCURACY
vs. TEMPERATURE
DROPOUT VOLTAGE
vs. LOAD CURRENT
DROPOUT vs. V
OUT
200
180
160
140
120
100
80
1.0
0.8
90
75
60
45
30
15
0
T
= +25°C
A
0.6
0.4
GUARANTEED MAXIMUM
T
= +85°C
A
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
T
= -40°C
A
MEAN
60
40
20
0
2.5
2.7
2.9
(V)
3.1
3.3
-40 -25 -10
5
20 35 50 65 80
0
10 20 30 40 50 60 70 80
LOAD CURRENT (mA)
V
TEMPERATURE (°C)
OUT
_______________________________________________________________________________________
3
Dual, Low-Noise, Low-Dropout, 160mA Linear
Regulators in SOT23
Typical Operating Characteristics (continued)
(V
OUT
_ = 2.85V, I
_ = 80mA, V = +3.6V, C
IN
_ = 2.2µF, C = 0.01µF, and C = 2.2µF, unless otherwise noted.)
OUT
OUT
BP
IN
CHANNEL-TO-CHANNEL ISOLATION
vs. FREQUENCY
PSRR vs. FREQUENCY
120
100
80
60
40
20
0
70
100Ω LOAD
100Ω LOAD
60
50
40
30
20
10
0
CAPACITVE
COUPLING
THERMAL
COUPLING
0.01
0.1
1
10
100
1000
0.01
0.1
1
10
100
1000
FREQUENCY (kHz)
FREQUENCY (kHz)
OUTPUT NOISE SPECTRAL DENSITY
vs. FREQUENCY
MAX8882 OUTPUT NOISE
(10Hz to 100kHz)
10000
1000
100
500µV/div
(AC-COUPLED)
V
_
OUT
10
0.01
0.1
1
10
100
1000
1ms/div
LOAD TRANSIENT
LINE TRANSIENT
(V = 3.35V, I
= 0 TO 80mA)
IN
LOAD
MAX8882/3 toc11
MAX8882/3 toc12
4.5V
V
IN
20mV/div
(AC-COUPLED)
3.5V
V
_
OUT
1V/div
20mV/div
(AC-COUPLED)
50mA/div
0
V
_
I
OUT
LOAD
50µs/div
10µs/div
4
_______________________________________________________________________________________
Dual, Low-Noise, Low-Dropout, 160mA Linear
Regulators in SOT23
Typical Operating Characteristics (continued)
(V
OUT
_ = 2.85V, I
_ = 80mA, V = +3.6V, C
_ = 2.2µF, C = 0.01µF, and C = 2.2µF, unless otherwise noted.)
OUT
IN
OUT BP IN
LOAD TRANSIENT NEAR DROPOUT
SHUTDOWN RESPONSE
MAX8882/3 toc13
MAX8882/3 toc14
R
LOAD
= 100Ω
OUTPUT
20mV/div
V
20V/div
1V/div
OUT
VOLTAGE
0
V
= V
+ 0.1V
OUT
IN
SHUTDOWN
VOLTAGE
50µA/div
I
LOAD
0
0
10µs/div
1ms/div
Pin Description
PIN
NAME
FUNCTION
MAX8882
MAX8883
Regulator B Output. Sources up to 160mA continuous current. Bypass with a
2.2µF (<0.5Ω typ ESR) capacitor to GND (see the Capacitor Selection and
Regulator Stability section).
1
1
OUTB
Ground. This pin also functions as a heatsink. Solder to a large pad or the
circuit-board ground plane to maximize thermal dissipation.
2
3
2
GND
BP
Reference Noise Bypass. Bypass with a low-leakage 0.01µF ceramic
capacitor for reduced noise at both outputs.
—
Shutdown A Input. A logic low shuts down regulator A. If SHDNA and
SHDNB are both low, both regulators and the reference turn off, and supply
current is reduced to 10nA. If either SHDNA or SHDNB is a logic high, the
reference is on. Connect to IN for normal operation.
—
—
3
4
SHDNA
SHDNB
Shutdown B Input. A logic low shuts down regulator B. If SHDNA and
SHDNB are both low, both regulators and the reference turn off, and supply
current is reduced to 10nA. If either SHDNA or SHDNB is a logic high, the
reference is on. Connect to IN for normal operation.
Shutdown Input. A logic low shuts down both regulators and the reference,
reducing the entire supply current to 10nA. Connect to IN for normal
operation.
4
5
6
—
5
SHDN
IN
Regulator Input. Supply voltage can range from +2.5V to +6.5V. This input
also supplies the on-chip reference. Bypass with 2.2µF to GND (see the
Capacitor Selection and Regulator Stability section).
Regulator A Output. Sources up to 160mA continuous current. Bypass with
a 2.2µF (<0.5Ω typ ESR) capacitor to GND (see the Capacitor Selection and
Regulator Stability section).
6
OUTA
_______________________________________________________________________________________
5
Dual, Low-Noise, Low-Dropout, 160mA Linear
Regulators in SOT23
perature exceeds T = +160°C, the thermal sensor sig-
J
Detailed Description
nals the shutdown logic, turning off the pass transistor
and allowing the IC to cool. The thermal sensor will turn
the pass transistor on again after the IC’s junction tem-
perature cools by 10°C, resulting in a pulsed output
during continuous thermal-overload conditions.
The MAX8882/MAX8883 are low-noise, low-dropout,
low-quiescent-current linear regulators designed primar-
ily for battery-powered applications. These parts are
available with preset output voltages ranging from 1.8V
to 3.3V, and the parts can supply loads up to 160mA.
Thermal-overload protection is designed to protect the
MAX8882/MAX8883 in the event of fault conditions. For
continual operation, do not exceed the absolute maxi-
Shutdown
MAX8882
The MAX8882 has a single shutdown control input
(SHDN). Drive SHDN low to shut down both outputs,
reducing supply current to 10nA. Connect SHDN to a
logic-high, or IN, for normal operation.
mum junction-temperature rating of T = +150°C.
J
Operating Region and Power Dissipation
The MAX8882/MAX8883’s maximum power dissipation
depends on the thermal resistance of the case and cir-
cuit board, the temperature difference between the die
junction and ambient air, and the rate of air flow. The
MAX8883
The MAX8883 has independent shutdown control
inputs (SHDNA and SHDNB). Drive SHDNA low to shut
down OUTA. Drive SHDNB low to shut down OUTB.
Drive both SHDNA and SHDNB low to shut down the
entire chip, reducing supply current to 10nA. Connect
both SHDNA and SHDNB to a logic-high, or IN, for nor-
mal operation.
power dissipation across the device is P = I
OUT
(V
-
IN
OUT
V
) (Figure 1). The maximum power dissipation is:
P
MAX
= (T - T ) / (T + T
)
BA
J
A
JB
where T - T is the temperature difference between
J
A
the MAX8882/MAX8883 die junction and the surround-
ing air, T (or T ) is the thermal resistance of the
JB
JC
package, and T is the thermal resistance through the
BA
Internal P-Channel Pass Transistor
The MAX8882/MAX8883 feature two 1Ω P-channel
MOSFET pass transistors. A P-channel MOSFET pro-
vides several advantages over similar designs using
PNP pass transistors, including longer battery life. It
requires no base drive, which reduces quiescent cur-
rent significantly. PNP-based regulators waste consid-
erable current in dropout when the pass transistor
saturates, and they also use high base-drive currents
under large loads. The MAX8882/MAX8883 do not suf-
fer from these problems and only consume 165µA of
quiescent current whether in dropout, light-load, or
heavy-load applications (see the Typical Operating
Characteristics). While a PNP-based regulator has
dropout voltage that is independent of the load, a P-
channel MOSFET’s dropout voltage is proportional to
load current, providing for low dropout voltage at heavy
loads and extremely low dropout voltage at lighter
loads.
printed circuit board, copper traces, and other materi-
als to the surrounding air.
The GND pin of the MAX8882/MAX8883 performs the
dual functions of providing an electrical connection to
the ground and channeling heat away. Connect the
GND pin to ground using a large pad or ground plane.
SAFE OPERATING REGION
180
+70°C
160
140
120
100
80
60
40
20
0
+85°C
Current Limit
The MAX8882/MAX8883 contain two independent cur-
rent limiters, one for each regulator, which monitor and
control the pass transistor’s gate voltage, limiting the
guaranteed maximum output current to 160mA mini-
mum. The output can be shorted to ground for an indef-
inite time without damaging the part.
0
1
2
3
4
5
V
- V _ (V)
IN OUT
Figure 1. MAX8882/MAX8883 Safe Operating Region
Thermal-Overload Protection
Thermal-overload protection limits total power dissipa-
tion in the MAX8882/MAX8883. When the junction tem-
6
_______________________________________________________________________________________
Dual, Low-Noise, Low-Dropout, 160mA Linear
Regulators in SOT23
Low-Noise Operation (MAX8882)
An external 0.01µF bypass capacitor at BP, in conjunc-
tion with an internal resistor, creates a lowpass filter.
PSRR and Operation from Sources
Other than Batteries
The MAX8882/MAX8883 are designed to deliver low
dropout voltages and low quiescent currents in battery-
powered systems. Power-supply rejection is 62dB at
low frequencies and rolls off above 100kHz. (See the
PSRR vs. Frequency graph in the Typical Operating
Characteristics.)
The MAX8882 exhibits 40µV
with C = 0.01µF and C
of output voltage noise
RMS
_ = 4.7µF. (See the Output
BP
OUT
Noise Spectral Density graph in the Typical Operating
Characteristics.)
Applications Information
When operating from sources other than batteries,
improved supply-noise rejection and transient response
can be achieved by increasing the values of the input
and output bypass capacitors and through passive fil-
tering techniques.
Capacitor Selection and
Regulator Stability
Use a 2.2µF capacitor on the MAX8882/MAX8883 input
and a 2.2µF capacitor on the outputs. Larger input
capacitor values and lower ESRs provide better supply-
noise rejection and line-transient response. To reduce
noise, improve load transients, and for loads up to
160mA, use larger output capacitors (up to 10µF). For
stable operation over the full temperature range and
with load currents up to 80mA, use 2.2µF.
Dropout Voltage
A regulator’s minimum input-output voltage differential
(or dropout voltage) determines the lowest usable sup-
ply voltage. In battery-powered systems, this deter-
mines the useful end-of-life battery voltage. Because
the MAX8882/MAX8883 use a P-channel MOSFET pass
transistor, their dropout voltage is a function of drain-to-
Note that some ceramic dielectrics exhibit large capac-
itance and ESR variation with temperature. With
dielectrics such as Z5U and Y5V, it may be necessary
to use 4.7µF or more to ensure stability at temperatures
below -10°C. With X7R or X5R dielectrics, 2.2µF is suffi-
cient at all operating temperatures. These regulators
are optimized for ceramic capacitors, and tantalum
capacitors are not recommended.
source on-resistance (R
) multiplied by the load
DS(ON)
current (see the Typical Operating Characteristics).
Chip Information
TRANSISTOR COUNT: 493
Use a 0.01µF bypass capacitor at BP (MAX8882) for
low output voltage noise. Increasing the capacitance
will slightly decrease the output noise, but increase the
startup time. (See the Shutdown Response graph in the
Typical Operating Characteristics.)
PROCESS: BiCMOS
Pin Configurations (continued)
TOP VIEW
OUTB
GND
1
2
3
6
5
4
OUTA
IN
MAX8883
SHDNA
SHDNB
SOT23-6
_______________________________________________________________________________________
7
Dual, Low-Noise, Low-Dropout, 160mA Linear
Regulators in SOT23
Package Information
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2001 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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