AX8864T [MAXIM]

Low-Dropout, 120mA Linear Regulators; 低压差, 120mA线性稳压器
AX8864T
元器件型号: AX8864T
生产厂家: MAXIM INTEGRATED PRODUCTS    MAXIM INTEGRATED PRODUCTS
描述和应用:

Low-Dropout, 120mA Linear Regulators
低压差, 120mA线性稳压器

稳压器
PDF文件: 总10页 (文件大小:469K)
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MAX34334CSE前5页PDF页面详情预览
19-0466; Rev 4; 7/12
Low-Dropout, 120mA Linear Regulators
_______________General Description
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.
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 package.
____________________________Features
o
Low Cost
o
Low, 55mV Dropout Voltage @ 50mA I
OUT
o
Low, 68µA No-Load Supply Current
Low, 80µA Operating Supply Current (even in
dropout)
o
Low, 350µV
RMS
Output Noise
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
MAX8863T/S/R, MAX8864T/S/R
______________Ordering Information
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
________________________Applications
MAX8863TEUK+T
PIN-
PACKAGE
5 SOT23
5 SOT23
5 SOT23
5 SOT23
5 SOT23
SOT TOP
MARK*
AABE
AABF
AABV
AABG
AABH
Cordless Telephones
PCS Telephones
Cellular Telephones
PCMCIA Cards
Modems
Hand-Held Instruments
Palmtop Computers
Electronic Planners
MAX8863SEUK+T
MAX8863REUK+T
MAX8864TEUK+T
MAX8864SEUK+T
MAX8864REUK+T -40°C to +85°C
5 SOT23
AABW
*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
IN
OUT
OUTPUT
VOLTAGE
C
OUT
1µF
SHDN 1
5
SET
BATTERY
C
IN
1µF
MAX8863
MAX8864
SHDN
GND
SET
GND 2
MAX8863
MAX8864
OUT
IN 3
4
SOT23
Dual Mode is a trademark of Maxim Integrated Products.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
Low-Dropout, 120mA Linear Regulators
MAX8863T/S/R, MAX8864T/S/R
ABSOLUTE MAXIMUM RATINGS
V
IN
to GND ..................................................................-7V to +7V
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
OUT to GND ................................................-0.3V to (V
IN
+ 0.3V)
Continuous Power Dissipation (multilayer board, T
A
= +70°C)
SOT23 (3.9mW/°C above +70°C).............................312.6mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
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.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
SOT23
Junction-to-Ambient Thermal Resistance (θ
JA
)...............255.9°C/W
Junction-to-Case Thermal Resistance (θ
JC
)......................81°C/W
Note 1:
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to
www.maxim-ic.com/thermal-tutorial.
ELECTRICAL CHARACTERISTICS
(V
IN
= +3.6V, V
GND
= 0V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
Input Voltage (Note 3)
Output Voltage
Adjustable Output Voltage
Range (Note 4)
Maximum Output Current
Current Limit (Note 5)
Ground Pin Current
Dropout Voltage (Note 6)
Line Regulation
Load Regulation
Output Voltage Noise
SHUTDOWN
SHDN Input Threshold
V
IH
V
IL
2.0
0.4
V
∆V
LNR
∆V
LDR
I
LIM
I
Q
SET = GND
I
OUT
= 1mA
I
OUT
= 50mA
V
IN
= 2.5V to 6.5V, SET tied to OUT,
I
OUT
= 1mA
I
OUT
= 0mA to 50mA
10Hz to 1MHz
SET = GND
SET tied to OUT
C
OUT
= 1µF
C
OUT
= 100µF
-0.15
I
LOAD
= 0mA
I
LOAD
= 50mA
SYMBOL
V
IN
V
OUT
0mA
I
OUT
50mA,
SET = GND
MAX886_T
MAX886_S
MAX886_R
CONDITIONS
MIN
2.5
3.05
2.75
2.70
V
SET
120
280
68
80
1.1
55
0
0.011
0.006
350
220
120
+0.15
0.040
150
3.15
2.84
2.80
TYP
MAX
6.5
3.25
2.93
2.88
6.5
V
mA
mA
µA
mV
%/V
%/mA
µV
RMS
V
UNITS
V
V
OUT
2
Low-Dropout, 120mA Linear Regulators
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +3.6V, V
GND
= 0V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
SHDN
Input Bias Current
Shutdown Supply Current
Shutdown Discharge Resistance
(MAX8864)
SET INPUT
Set Reference Voltage
(Note 4)
Set Input Leakage Current
(Note 4)
THERMAL PROTECTION
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
T
SHDN
∆T
SHDN
170
20
°C
°C
T
A
= +25°C
T
A
= T
MIN
to
T
A
= +25°C
T
A
= T
MAX
1.225
1.215
SYMBOL
I
SHDN
I
QSHDN
V
SHDN
= V
IN
V
OUT
= 0V
CONDITIONS
T
A
= +25°C
T
A
= T
MAX
T
A
= +25°C
T
A
= T
MAX
MIN
TYP
0
0.05
0.0001
0.02
300
1
MAX
100
UNITS
nA
µA
MAX8863T/S/R, MAX8864T/S/R
V
SET
I
SET
V
IN
= 2.5V to 6.5V,
I
OUT
= 1mA
V
SET
= 1.3V
1.25
1.25
0.015
0.5
1.275
1.285
2.5
V
nA
Note 2:
Limits are 100% production tested at T
A
= +25°C. Limits over the operating temperature range are guaranteed through cor-
relation using Statistical Quality Control (SQC) Methods.
Note 3:
Guaranteed by line regulation test.
Note 4:
Adjustable mode only.
Note 5:
Not tested. For design purposes, the current limit should be considered 120mA minimum to 420mA maximum.
Note 6:
The dropout voltage is defined as (V
IN
- V
OUT
) when V
OUT
is 100mV below the value of V
OUT
for V
IN
= V
OUT
+2V.
__________________________________________Typical Operating Characteristics
(V
IN
= +3.6V, C
IN
= 1µF, C
OUT
= 1µF, T
A
= +25°C, MAX886_T, unless otherwise noted.)
OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX8863/4-01
SUPPLY CURRENT
vs. LOAD CURRENT
MAX8863/4-02
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
MAX8863/4-03
3.30
3.25
OUTPUT VOLTAGE (V)
3.20
3.15
3.10
3.05
3.00
0
100
95
90
SUPPLY CURRENT (µA)
85
80
75
70
65
60
55
50
3.5
3.0
OUTPUT VOLTAGE (V)
2.5
2.0
NO LOAD
1.5
1.0
0.5
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
MAX8863T/S/R, MAX8864T/S/R
____________________________Typical Operating Characteristics (continued)
(V
IN
= +3.6V, C
IN
= 1µF, C
OUT
= 1µF, MAX886_T, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX8863/4-04
OUTPUT VOLTAGE
vs. TEMPERATURE
MAX8863/4-05
SUPPLY CURRENT
vs. TEMPERATURE
90
80
SUPPLY CURRENT (µA)
70
60
50
40
30
20
10
I
LOAD
= 50mA
MAX8863/4-06
90
80
SUPPLY CURRENT (µA)
70
60
50
40
30
20
I
LOAD
= 50mA
I
LOAD
= 0mA
3.30
I
LOAD
= 50mA
3.25
OUTPUT VOLTAGE (V)
3.20
3.15
3.10
3.05
100
10
0
0
1
2
3
4
5
6
INPUT VOLTAGE (V)
3.00
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
0
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX8863/4-07
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX8863/4-08
OUTPUT SPECTRAL NOISE DENSITY
vs. FREQUENCY
OUTPUT SPECTRAL NOISE DENSITY (µV/÷Hz)
R
L
= 50Ω
C
OUT
= 1µF
1
MAX8863/64-8A
140
120
DROPOUT VOLTAGE (mV)
100
80
60
40
20
0
0
T
A
= -40°C
T
A
= +85°C
70
60
50
PSRR (dB)
40
30
20
10
0
V
OUT
= 3.15V
R
L
= 100W
10
T
A
= +25°C
C
OUT
= 10µF
C
OUT
= 100µF
0.10
C
OUT
= 1µF
0.01
0.01
0.1
1
10
FREQUENCY (kHz)
100
1000
0.1
1
10
FREQUENCY (kHz)
100
1000
10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
REGION OF STABLE C
OUT
ESR
vs. LOAD CURRENT
C
OUT
= 1µF
100
C
OUT
ESR (Ω)
INTERNAL FEEDBACK
MAX8863/64-8B
OUTPUT NOISE DC TO 1MHz
1000
10
1
STABLE REGION
0.1
EXTERNAL FEEDBACK
V
OUT
0.01
0
10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
1ms/div
I
LOAD
= 50mA, V
OUT
IS AC COUPLED
4
Low-Dropout, 120mA Linear Regulators
____________________________Typical Operating Characteristics (continued)
(V
IN
= +3.6V, C
IN
= 1µF, C
OUT
= 1µF, MAX886_T, T
A
= +25°C, unless otherwise noted.)
LINE TRANSIENT
3.16V
V
OUT
3.15V
3.14V
3.16V
V
OUT
3.15V
3.14V
MAX8863T/S/R, MAX8864T/S/R
LOAD TRANSIENT
V
IN
4.6V
3.6V
50µs/div
I
LOAD
= 50mA, V
OUT
IS AC COUPLED
I
LOAD
10µs/div
I
LOAD
= 0mA to 50mA, C
IN
= 10µF, V
OUT
IS AC COUPLED
LOAD TRANSIENT
3.16V
V
OUT
3.15V
3.14V
3.16V
V
OUT
3.15V
3.14V
LOAD TRANSIENT
I
LOAD
50mA
I
LOAD
0mA
10µs/div
V
IN
= V
OUT
+ 0.2V, I
LOAD
= 0mA to 50mA, C
IN
= 10µF,
V
OUT
IS AC COUPLED
10µs/div
V
IN
= V
OUT
+ 0.1V, I
LOAD
= 0mA to 50mA, C
IN
= 10µF,
V
OUT
IS AC COUPLED
MAX8864 SHUTDOWN (NO LOAD)
4V
V
OUT
4V
V
OUT
MAX8864 SHUTDOWN
2V
0V
2V
0V
V
SHDN
2V
V
SHDN
0V
2V
0V
500µs/div
NO LOAD
I
LOAD
= 50mA
200µs/div
5
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