MAX8864TEUK [MAXIM]
Low-Dropout, 120mA Linear Regulators Miniature External Components; 低压差， 120mA线性稳压器小型外部元件
| 型号： | MAX8864TEUK |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Low-Dropout, 120mA Linear Regulators Miniature External Components |
| 文件： | 总10页 (文件大小：469K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-0466; Rev 3; 5/11
Low-Dropout, 120mA Linear Regulators
3,MAX864TS/R
_______________General Description
____________________________Features
o Low Cost
The MAX8863T/S/R and MAX8864T/S/R low-dropout lin-
ear regulators operate from a +2.5V to +6.5V input
range and deliver up to 120mA. A PMOS pass transis-
tor allows the low, 80µA supply current to remain inde-
pendent of load, making these devices ideal for
battery-operated portable equipment such as cellular
phones, cordless phones, and modems.
o Low, 55mV Dropout Voltage @ 50mA I
o Low, 68µA No-Load Supply Current
OUT
Low, 80µA Operating Supply Current (even in
dropout)
o Low, 350µV
Output Noise
RMS
The devices feature Dual Mode™ operation: their out-
put voltage is preset (at 3.15V for the T versions, 2.84V
for the S versions, or 2.80V for the R versions) or can be
adjusted with an external resistor divider. Other fea-
tures include low-power shutdown, short-circuit protec-
tion, thermal shutdown protection, and reverse battery
protection. The MAX8864 also includes an auto-dis-
charge function, which actively discharges the output
voltage to ground when the device is placed in shut-
down mode. Both devices come in a miniature 5-pin
SOT23-5 package.
o Miniature External Components
o Thermal Overload Protection
o Output Current Limit
o Reverse Battery Protection
o Dual Mode™ Operation: Fixed or Adjustable
(1.25V to 6.5V) Output
o Low-Power Shutdown
______________Ordering Information
PIN-
PACKAGE
SOT TOP
MARK*
PART
TEMP RANGE
________________________Applications
MAX8863TEUK+T -40°C to +85°C 5 SOT23-5
MAX8863SEUK+T -40°C to +85°C 5 SOT23-5
MAX8863REUK+T -40°C to +85°C 5 SOT23-5
MAX8864TEUK+T -40°C to +85°C 5 SOT23-5
MAX8864SEUK+T -40°C to +85°C 5 SOT23-5
AABE
AABF
AABV
AABG
AABH
AABW
Cordless Telephones
PCS Telephones
Cellular Telephones
PCMCIA Cards
Modems
Hand-Held Instruments
Palmtop Computers
Electronic Planners
MAX8864REUK+T -40°C to +85°C 5 SOT23-5
*Alternate marking information: CY_ _ = MAX8863T,
CZ_ _ = MAX8863S, DA_ _ = MAX8864T, DB_ _ = MAX8864S
+Denotes a lead(Pb)-free/RoHS-compliant package.
__________Typical Operating Circuit
__________________Pin Configuration
TOP VIEW
1
2
3
5
SET
SHDN
GND
IN
OUT
OUTPUT
VOLTAGE
IN
MAX8863
MAX8864
MAX8863
MAX8864
C
C
1µF
OUT
1µF
IN
SHDN
BATTERY
GND
SET
OUT
4
SOT23-5
Dual Mode is a trademark of Maxim Integrated Products.
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
Low-Dropout, 120mA Linear Regulators
ABSOLUTE MAXIMUM RATINGS
Output Short-Circuit Duration ............................................Infinite
SET to GND ..............................................................-0.3V to +7V
SHDN to GND..............................................................-7V to +7V
SHDN to IN...............................................................-7V to +0.3V
V
IN
to GND ..................................................................-7V to +7V
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
θ
...........................................................................324.3°C/Watt
Storage Temperature Range.............................-65°C to +160°C
JA
Lead Temperature (soldering, 10sec) .............................+300°C
OUT to GND ................................................-0.3V to (V + 0.3V)
IN
Continuous Power Dissipation (T = +70°C)
A
SOT23-5 (3.1mW/°C above +70°C) .........................246.7mW
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
, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
MAX A
(V = +3.6V, GND = 0V, T = T
to T
IN
A
MIN
PARAMETER
Input Voltage (Note 2)
SYMBOL
CONDITIONS
MIN
2.5
TYP
MAX
6.5
UNITS
V
V
IN
MAX886_T
MAX886_S
MAX886_R
3.05
2.75
2.70
3.15
2.84
2.80
3.25
2.93
2.88
0mA ≤ I
≤ 50mA,
OUT
SET = GND
Output Voltage
V
V
I
V
OUT
OUT
LIM
Adjustable Output Voltage
Range (Note 3)
V
SET
6.5
V
Maximum Output Current
Current Limit (Note 4)
120
-0.15
2.0
mA
mA
280
68
I
I
= 0mA
150
LOAD
Ground Pin Current
Dropout Voltage (Note 5)
Line Regulation
I
Q
SET = GND
µA
mV
= 50mA
80
LOAD
3,MAX864TS/R
I
I
= 1mA
1.1
55
OUT
= 50mA
120
0.15
OUT
V
IN
= 2.5V to 6.5V, SET tied to OUT,
∆V
∆V
0
%/V
LNR
I
= 1mA
OUT
SET = GND
SET tied to OUT
0.011
0.006
350
0.040
Load Regulation
I
= 0mA to 50mA
%/mA
OUT
LDR
C
OUT
C
OUT
= 1µF
Output Voltage Noise
SHUTDOWN
10Hz to 1MHz
µV
RMS
= 100µF
220
V
IH
SHDN Input Threshold
V
V
0.4
IL
T
A
T
A
T
A
T
A
= +25°C
0
100
I
V
V
= V
nA
µA
Ω
SHDN Input Bias Current
SHDN
SHDN
IN
= T
0.05
MAX
= +25°C
= T
0.0001
0.02
1
Shutdown Supply Current
I
= 0V
OUT
QSHDN
MAX
Shutdown Discharge
Resistance (MAX8864)
300
2
_______________________________________________________________________________________
Low-Dropout, 120mA Linear Regulators
3,MAX864TS/R
ELECTRICAL CHARACTERISTICS (continued)
, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
MAX A
(V = +3.6V, GND = 0V, T = T
to T
IN
A
MIN
PARAMETER
SET INPUT
SYMBOL
CONDITIONS
MIN
TYP
MAX UNITS
T
A
T
A
T
A
T
A
= +25°C
1.225
1.215
1.25
1.25
0.015
0.5
1.275
V
V
= 2.5V to 6.5V,
IN
SET Reference Voltage (Note 3)
V
SET
I
= 1mA
OUT
= T
to T
1.285
MAX
MIN
= +25°C
= T
2.5
nA
SET Input Leakage Current
(Note 3)
I
V
SET
= 1.3V
SET
MAX
THERMAL PROTECTION
Thermal Shutdown Temperature
T
170
20
˚C
˚C
SHDN
Thermal Shutdown Hysteresis
∆T
SHDN
Note 1: Limits are 100% production tested at T = +25°C. Limits over the operating temperature range are guaranteed through cor-
A
relation using Statistical Quality Control (SQC) Methods.
Note 2: Guaranteed by line regulation test.
Note 3: Adjustable mode only.
Note 4: Not tested. For design purposes, the current limit should be considered 120mA minimum to 420mA maximum.
Note 5: The dropout voltage is defined as (V - V
) when V
is 100mV below the value of V
for V = V
+2V.
OUT
IN
OUT
OUT
OUT
IN
__________________________________________Typical Operating Characteristics
(V = +3.6V, C = 1µF, C
= 1µF, T = +25°C, MAX886_T, unless otherwise noted.)
A
IN
IN
OUT
OUTPUT VOLTAGE
vs. LOAD CURRENT
SUPPLY CURRENT
vs. LOAD CURRENT
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
3.30
3.25
3.20
3.15
3.10
3.05
3.00
100
95
90
85
80
75
70
65
60
55
50
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
NO LOAD
0
10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
0
10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
0
1
2
3
4
5
6
INPUT VOLTAGE (V)
_______________________________________________________________________________________
3
Low-Dropout, 120mA Linear Regulators
____________________________Typical Operating Characteristics (continued)
(V = +3.6V, C = 1µF, C
= 1µF, MAX886_T, T = +25°C, unless otherwise noted.)
A
IN
IN
OUT
SUPPLY CURRENT
vs. TEMPERATURE
SUPPLY CURRENT
vs. INPUT VOLTAGE
OUTPUT VOLTAGE
vs. TEMPERATURE
90
100
90
80
70
60
50
40
30
20
3.30
3.25
3.20
3.15
3.10
3.05
3.00
I
= 50mA
I
= 50mA
LOAD
LOAD
80
70
I
I
= 50mA
= 0mA
LOAD
LOAD
60
50
40
30
20
10
0
10
0
-40 -20
0
20
40
60
80 100
0
1
2
3
4
5
6
-40 -20
0
20
40
60
80 100
TEMPERATURE (°C)
INPUT VOLTAGE (V)
TEMPERATURE (°C)
DROPOUT VOLTAGE
vs. LOAD CURRENT
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
OUTPUT SPECTRAL NOISE DENSITY
vs. FREQUENCY
140
120
100
80
10
70
60
50
40
30
20
10
0
V
= 3.15V
OUT
R = 50Ω
L
T
= +85°C
A
R = 100W
L
C
= 1µF
OUT
T
= +25°C
A
1
0.10
0.01
C
= 10µF
OUT
3,MAX864TS/R
60
C
= 100µF
OUT
T
= -40°C
A
C
= 1µF
OUT
40
20
0
0
10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
0.1
1
10
FREQUENCY (kHz)
100
1000
0.01
0.1
1
10
100
1000
FREQUENCY (kHz)
REGION OF STABLE C
ESR
OUT
OUTPUT NOISE DC TO 1MHz
vs. LOAD CURRENT
1000
COUT = 1µF
100
10
1
INTERNAL FEEDBACK
EXTERNAL FEEDBACK
V
OUT
STABLE REGION
0.1
0.01
0
10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
1ms/div
I
= 50mA, V
IS AC COUPLED
LOAD
OUT
4
_______________________________________________________________________________________
Low-Dropout, 120mA Linear Regulators
3,MAX864TS/R
____________________________Typical Operating Characteristics (continued)
(V = +3.6V, C = 1µF, C
= 1µF, MAX886_T, T = +25°C, unless otherwise noted.)
A
IN
IN
OUT
LOAD TRANSIENT
LINE TRANSIENT
3.16V
3.15V
3.14V
3.16V
3.15V
3.14V
V
V
OUT
OUT
4.6V
I
LOAD
V
IN
3.6V
10µs/div
50µs/div
I
= 0mA to 50mA, C = 10µF, V
IS AC COUPLED
I
= 50mA, V
IS AC COUPLED
LOAD
IN
OUT
LOAD
OUT
LOAD TRANSIENT
LOAD TRANSIENT
3.16V
3.15V
3.14V
3.16V
3.15V
3.14V
V
OUT
V
OUT
50mA
0mA
I
I
LOAD
LOAD
10µs/div
10µs/div
V
V
= V
+ 0.2V, I
= 0mA to 50mA, C = 10µF,
V
V
= V
+ 0.1V, I
= 0mA to 50mA, C = 10µF,
IN
OUT
LOAD
IN
IN
OUT
LOAD
IN
IS AC COUPLED
IS AC COUPLED
OUT
OUT
MAX8864 SHUTDOWN (NO LOAD)
MAX8864 SHUTDOWN
4V
2V
4V
2V
V
OUT
V
OUT
0V
0V
2V
0V
2V
0V
V
SHDN
V
SHDN
500µs/div
200µs/div
I
= 50mA
NO LOAD
LOAD
_______________________________________________________________________________________
5
Low-Dropout, 120mA Linear Regulators
______________________________________________________________Pin Description
PIN
NAME
FUNCTION
Active-Low Shutdown Input. A logic low reduces the supply current to 0.1nA. On the MAX8864, a logic low
also causes the output voltage to discharge to GND. Connect to IN for normal operation.
1
SHDN
Ground. This pin also functions as a heatsink. Solder to large pads or the circuit board ground plane to max-
imize thermal dissipation.
2
3
4
GND
IN
Regulator Input. Supply voltage can range from +2.5V to +6.5V. Bypass with 1µF to GND (see Capacitor
Selection and Regulator Stability).
Regulator Output. Fixed or adjustable from 1.25V to +6.5V. Sources up to 120mA. Bypass with a 1µF, <0.2Ω
typical ESR capacitor to GND.
OUT
Feedback Input for Setting the Output Voltage. Connect to GND to set the output voltage to the preset 2.80V
(MAX886_R), 2.84V (MAX886_S), or 3.15V (MAX886_T). Connect to an external resistor divider for
adjustable-output operation.
5
SET
and applies the appropriate drive to the P-channel pass
_______________Detailed Description
transistor. If the feedback voltage is lower than the refer-
ence, the pass-transistor gate is pulled lower, allowing more
current to pass and increasing the output voltage. If the
feedback voltage is too high, the pass-transistor gate is
pulled up, allowing less current to pass to the output.
The MAX8863/MAX8864 are low-dropout, low-quiescent-
current linear regulators designed primarily for battery-
powered applications. They supply an adjustable 1.25V to
6.5V output or a preselected 2.80V (MAX886_R), 2.84V
(MAX886_S), or 3.15V (MAX886_T) output for load currents
up to 120mA. As illustrated in Figure 1, these devices con-
sist of a 1.25V reference, error amplifier, MOSFET driver, P-
channel pass transistor, Dual Mode™ comparator, and
internal feedback voltage divider.
The output voltage is fed back through either an internal
resistor voltage divider connected to the OUT pin, or an
external resistor network connected to the SET pin. The
Dual Mode comparator examines the SET voltage and
selects the feedback path. If SET is below 60mV, internal
feedback is used and the output voltage is regulated to the
preset output voltage. Additional blocks include a current
limiter, reverse battery protection, thermal sensor, and shut-
down logic.
The 1.25V bandgap reference is connected to the error
amplifier’s inverting input. The error amplifier compares this
reference with the selected feedback voltage and amplifies
the difference. The MOSFET driver reads the error signal
3,MAX864TS/R
REVERSE
BATTERY
PROTECTION
IN
SHDN
P
MOS DRIVER
ERROR
AMP
WITH I
LIMIT
SHUTDOWN
LOGIC
N
MAX8863
MAX8864
OUT
SET
*
1.25V
REF
THERMAL
SENSOR
DUAL-MODE
COMPARATOR
60mV
GND
* AUTO-DISCHARGE, MAX8864 ONLY
Figure 1. Functional Diagram
_______________________________________________________________________________________
6
Low-Dropout, 120mA Linear Regulators
3,MAX864TS/R
Choose R2 = 100kΩ to optimize power consumption,
accuracy, and high-frequency power-supply rejection.
The total current through the external resistive feedback
OUTPUT
VOLTAGE
and load resistors should not be less than 10µA. Since
OUT
IN
the V
tolerance is typically less than 25mV, the out-
SET
put can be set using fixed resistors instead of trim pots.
Connect a 10pF to 25pF capacitor across R1 to com-
pensate for layout-induced parasitic capacitances.
MAX8863
MAX8864
SHDN
R1 20pF
R2
SET
R
L
C
1µF
IN
C
1µF
OUT
BATTERY
In preset voltage mode, impedances between SET and
ground should be less than 100kΩ. Otherwise, spurious
conditions could cause the voltage at SET to exceed
the 60mV Dual Mode threshold.
GND
Shutdown
A low input on the SHDN pin shuts down the
MAX8863/MAX8864. In shutdown mode, the pass tran-
sistor, control circuit, reference, and all biases are
turned off, reducing the supply current to typically
0.1nA. Connect SHDN to IN for normal operation. The
MAX8864 output voltage is actively discharged to
ground when the part is placed in shutdown (see
Typical Operating Characteristics).
Figure 2. Adjustable Output Using External Feedback
Resistors
Internal P-Channel Pass Transistor
The MAX8863/MAX8864 feature a 1.1Ω typical P-chan-
nel MOSFET pass transistor. This provides several
advantages over similar designs using PNP pass tran-
sistors, including longer battery life.
Current Limit
The MAX8863/MAX8864 include a current limiter that
monitors and controls the pass transistor’s gate volt-
age, estimating the output current and limiting it to
about 280mA. For design purposes, the current limit
should be considered 120mA (min) to 420mA (max).
The output can be shorted to ground for an indefinite
time period without damaging the part.
The P-channel MOSFET requires no base drive current,
which reduces quiescent current considerably. PNP-
based regulators waste considerable amounts of cur-
rent in dropout when the pass transistor saturates. They
also use high base-drive currents under large loads.
The MAX8863/MAX8864 do not suffer from these prob-
lems, and consume only 80µA of quiescent current,
whether in dropout, light load, or heavy load applica-
tions (see Typical Operating Characteristics).
Thermal Overload Protection
Thermal overload protection limits total power dissipa-
tion in the MAX8863/MAX8864. When the junction tem-
Output Voltage Selection
The MAX8863/MAX8864 feature Dual Mode operation:
they operate in either a preset voltage mode or an
adjustable mode.
perature exceeds T = +170°C, the thermal sensor
J
sends a signal to 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 temperature typically cools by 20°C,
resulting in a pulsed output during continuous thermal
overload conditions.
In preset voltage mode, internal, trimmed feedback
resistors set the MAX886_R output to 2.80V, the
MAX886_S output to 2.84V, and the MAX886_T output to
3.15V. Select this mode by connecting SET to ground.
Thermal overload protection is designed to protect the
MAX8863/MAX8864 in the event of fault conditions.
Stressing the device with high load currents and high
input-output differential voltages (which result in die tem-
peratures above +125°C) may cause a momentary over-
shoot (2% to 8% for 200ms) when the load is completely
removed. This can be remedied by raising the minimum
load current from 0µA (+125°C) to 100µA (+150°C). For
continuous operation, do not exceed the absolute maxi-
In adjustable mode, select an output between 1.25V
and 6.5V using two external resistors connected as a
voltage divider to SET (Figure 2). The output voltage is
set by the following equation:
V
OUT
= V
(1 + R1 / R2)
SET
where V
= 1.25V. To simplify resistor selection:
SET
⎛
⎜
⎜
⎝
⎞
mum junction temperature rating of T = +150°C.
VOUT
VSET
J
R1= R2
− 1
⎟
⎟
⎠
_______________________________________________________________________________________
7
Low-Dropout, 120mA Linear Regulators
if large, fast transients are anticipated and the device is
Operating Region and Power Dissipation
Maximum power dissipation of the MAX8863/MAX8864
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
located several inches from the power source. Improve
load-transient response, stability, and power-supply
rejection by using large output capacitors. For stable
operation over the full temperature range, with load cur-
rents up to 120mA, a minimum of 1µF is recommended.
power dissipation across the device is P = I
(V
-
OUT
IN
V
OUT
). The resulting maximum power dissipation is:
Noise
noise during
P
MAX
= (T - T ) / θ
J A JA
The MAX8863/MAX8864 exhibit 350µV
RMS
where (T - T ) is the temperature difference between
normal operation. When using the MAX8863/MAX8864
in applications that include analog-to-digital converters
of greater than 12 bits, consider the ADC’s power-sup-
ply rejection specifications (see the Output Noise DC to
1MHz photo in the Typical Operating Characteristics).
J
A
the MAX8863/MAX8864 die junction and the surround-
ing air, and θ is the thermal resistance of the chosen
JA
package to the surrounding air.
The GND pin of the MAX8863/MAX8864 performs the
dual function of providing an electrical connection to
ground and channeling heat away. Connect the GND
pin to ground using a large pad or ground plane.
Power-Supply Rejection and Operation
from Sources Other than Batteries
The MAX8863/MAX8864 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 300Hz. As the fre-
quency increases above 20kHz, the output capacitor is
the major contributor to the rejection of power-supply
noise (see the Power-Supply Rejection Ratio vs.
Ripple Frequency graph in the Typical Operating
Characteristics).
Reverse Battery Protection
The MAX8863/MAX8864 have a unique protection
scheme that limits the reverse supply current to less
than 1mA when either V or V
falls below ground.
SHDN
IN
The circuitry monitors the polarity of these two pins, dis-
connecting the internal circuitry and parasitic diodes
when the battery is reversed. This feature prevents the
device from overheating and damaging the battery.
When operating from sources other than batteries,
improve supply-noise rejection and transient response
by increasing the values of the input and output capac-
itors, and using passive filtering techniques (see the
supply and load-transient responses in the Typical
Operating Characteristics).
V
> 5.5V Minimum Load Current
IN
When operating the MAX8863/MAX8864 with an input
voltage above 5.5V, a minimum load current of 20µA is
required to maintain regulation in preset voltage mode.
When setting the output with external resistors, the min-
imum current through the external feedback resistors
and load must be 30µA.
3,MAX864TS/R
Load Transient Considerations
The MAX8863/MAX8864 load-transient response
graphs (see Typical Operating Characteristics) show
two components of the output response: a DC shift of
the output voltage due to the different load currents,
and the transient response. Typical overshoot for step
changes in the load current from 0mA to 50mA is
12mV. Increasing the output capacitor’s value and
decreasing its ESR attenuates transient spikes.
__________Applications Information
Capacitor Selection and
Regulator Stability
Normally, use a 1µF capacitor on the input and a 1µF
capacitor on the output of the MAX8863/MAX8864.
Larger input capacitor values and lower ESR provide
better supply-noise rejection and transient response. A
higher-value input capacitor (10µF) may be necessary
8
_______________________________________________________________________________________
Low-Dropout, 120mA Linear Regulators
3,MAX864TS/R
Input-Output (Dropout) Voltage
Package Information
A regulator’s minimum input-output voltage differential
For the latest package outline information and land patterns
(footprints), go to www.maxim-ic.com/packages. Note that a
“+”, “#”, or “-” in the package code indicates RoHS status only.
Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
(or dropout voltage) determines the lowest usable sup-
ply voltage. In battery-powered systems, this will deter-
mine the useful end-of-life battery voltage. Because the
MAX8863/MAX8864 use a P-channel MOSFET pass
transistor, their dropout voltage is a function of RDS(ON)
multiplied by the load current (see Electrical
Characteristics).
PACKAGE
TYPE
5 SOT23
PACKAGE
CODE
OUTLINE
NO.
21-0057
LAND
PATTERN NO.
U5+1
90-0174
_______________________________________________________________________________________
9
Low-Dropout, 120mA Linear Regulators
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
Added lead-free designation and updated continuous power dissipation and
3
5/11
1, 2
θ
JA
specs
3,MAX864TS/R
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.
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