19-0485; Rev 0; 4/96
Dual, Low-Dropout, 100mA Linear Regulators
_______________General Description
The MAX8865 and MAX8866 dual, low-dropout linear
regulators operate from a +2.5V to +5.5V input range
and deliver up to 100mA. At 200mA total load, the
PMOS pass transistors keep the supply current at
145µA, 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 voltages are 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 external resistor dividers. Other
features include independent low-power shutdown,
short-circuit protection, thermal shutdown protection,
and reverse battery protection. The MAX8866 also
includes an auto-discharge function, which actively dis-
charges the selected output voltage to ground when
the device is placed in shutdown mode. Both devices
come in a miniature 8-pin µMAX package.
____________________________Features
o
Low Cost
o
Low, 55mV Dropout Voltage @ 50mA I
OUT
o
Low, 105µA No-Load Supply Current
o
Low, 145µA Operating Supply Current (even in
dropout)
o
Low, 350µV
RMS
Output Noise
o
Independent, Low-Current Shutdown Control
o
Thermal Overload Protection
o
Output Current Limit
o
Reverse Battery Protection
o
Dual Mode Operation: Fixed or Adjustable (1.25V
to 5.5V) Outputs
MAX8865T/S/R, MAX8866T/S/R
______________Ordering Information
________________________Applications
Cordless Telephones
PCS Telephones
Cellular Telephones
PCMCIA Cards
Modems
Hand-Held Instruments
Palmtop Computers
Electronic Planners
PART
MAX8865TEUA
MAX8865SEUA
MAX8865REUA
MAX8866TEUA
MAX8866SEUA
MAX8866REUA
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
-40°C to +85°C
PIN-
PACKAGE
8 µMAX
8 µMAX
8 µMAX
8 µMAX
8 µMAX
8 µMAX
PRESET
V
OUT
(V)
3.15
2.84
2.80
3.15
2.84
2.80
__________Typical Operating Circuit
__________________Pin Configuration
TOP VIEW
OUT1
IN
OUT2
OUTPUT
VOLTAGE 1
OUTPUT
VOLTAGE 2
C
OUT1
1µF
C
OUT2
1µF
C
IN
2µF
BATTERY
MAX8865
MAX8866
SHDN1
SHDN2
GND SET1 SET2
OUT1 1
IN 2
GND 3
OUT2 4
8
SET1
SHDN1
SHDN2
SET2
MAX8865
MAX8866
µMAX
7
6
5
SHDN2
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
Dual, Low-Dropout, 100mA Linear Regulators
MAX8865T/S/R, MAX8866T/S/R
ABSOLUTE MAXIMUM RATINGS
V
IN
to GND ..................................................................-6V to +6V
Output Short-Circuit Duration ............................................Infinite
SET_ to GND ............................................................-0.3V to +6V
SHDN_
to GND ............................................................-6V to +6V
_
SHDN_
to IN .............................................................-6V to +0.3V
_
OUT_ to GND...............................................-0.3V to (V
IN
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
µMAX (derate 4.1mW/°C above +70°C)......................330mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Thermal Resistance (θ
JA
)...............................................244°C/W
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°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.
ELECTRICAL CHARACTERISTICS
(V
IN
= +3.6V, GND = 0V, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Input Voltage (Note 1)
Output Voltage
Adjustable Output Voltage
Range (Note 2)
Maximum Output Current
Current Limit (Note 3)
Ground Pin Current
Dropout Voltage (Note 4)
Line Regulation
Load Regulation
Output Voltage Noise
SHUTDOWN
SHDN
Input Threshold
SHDN
Input Bias Current
Shutdown Supply Current
Shutdown to Output
Discharge Delay (MAX8866)
SET INPUT
SET Reference Voltage (Note 2)
SET Input Leakage Current
(Note 2)
THERMAL PROTECTION
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
2
V
SET_
I
SET_
V
IH
V
IL
I
SHDN_
_
I
Q
SHDN
V
SHDN_
= V
IN
_
V
OUT_
= 0V
C
OUT
= 1µF, no load
0
0.16
1
2.0
0.4
1000
3000
V
nA
nA
ms
∆V
LNR
∆V
LDR
SYMBOL
V
IN
V
OUT_
0mA
≤
I
OUT
≤
50mA,
SET_ = GND
MAX886_T
MAX886_S
MAX886_R
CONDITIONS
MIN
2.5
3.08
2.77
2.73
V
SET_
100
I
LIM
I
Q
SET_ = GND
I
OUT
= 1mA
I
OUT
= 50mA
V
IN
= 2.5V to 5.5V, 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
-0.10
I
OUT_
= 0mA
I
OUT_
= 50mA
220
105
145
1.1
55
0
0.012
0.006
350
220
270
TYP
3.15
2.84
2.80
MAX
5.5
3.24
2.91
2.87
5.5
UNITS
V
V
V
OUT_
V
mA
mA
µA
mV
%/V
%/mA
µV
RMS
120
0.10
0.03
V
IN
= 2.5V to 5.5V, I
OUT_
= 1mA
V
SET_
= 1.3V
1.222
1.25
0.015
1.276
50
V
nA
T
SHDN
∆T
SHDN
170
20
°C
°C
_______________________________________________________________________________________
Dual, Low-Dropout, 100mA Linear Regulators
ELECTRICAL CHARACTERISTICS
(V
IN
= +3.6V, GND = 0V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 5)
PARAMETER
Input Voltage (Note 1)
Output Voltage
Adjustable Output Voltage
Range (Note 2)
Maximum Output Current
Current Limit (Note 3)
Ground Pin Current
Dropout Voltage (Note 4)
Line Regulation
Load Regulation
Output Voltage Noise
SHUTDOWN
SHDN
Input Threshold
SHDN
Input Bias Current
Shutdown Supply Current
Shutdown to Output
Discharge Delay (MAX8866)
SET INPUT
SET Reference Voltage (Note 2)
SET Input Leakage Current
(Note 2)
THERMAL PROTECTION
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
T
SHDN
∆T
SHDN
170
20
°C
°C
V
SET_
I
SET_
V
IN
= 2.5V to 5.5V, I
OUT_
= 1mA
V
SET_
= 1.3V
1.207
1.25
0.015
1.288
50
V
nA
V
IH
V
IL
I
SHDN_
_
I
Q
SHDN
V
SHDN_
= V
IN
_
V
OUT_
= 0V
C
OUT
= 1µF
0
0.16
1
2.0
0.4
1000
3000
V
nA
nA
ms
∆V
LNR
∆V
LDR
I
LIM
I
Q
SET_ = GND
I
OUT
= 1mA
I
OUT
= 50mA
V
IN
= 2.5V to 5.5V,
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
-0.11
I
OUT_
= 0mA
I
OUT_
= 50mA
SYMBOL
V
IN
V
OUT_
0mA
≤
I
OUT
≤
50mA,
SET_ = GND
MAX886_T
MAX886_S
MAX886_R
V
OUT_
CONDITIONS
MIN
2.5
3.05
2.74
2.70
V
SET_
80
220
105
145
1.1
55
0
0.012
0.006
350
220
120
0.11
0.03
270
3.15
2.84
2.80
TYP
MAX
5.5
3.26
2.93
2.89
5.5
V
mA
mA
µA
mV
%/V
%/mA
µV
RMS
V
UNITS
V
MAX8865T/S/R, MAX8866T/S/R
Guaranteed by line regulation test.
Adjustable mode only.
Not tested. For design purposes, the current limit should be considered 120mA minimum to 320mA maximum.
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.
Specifications to -40°C are guaranteed by design and not production tested.
_______________________________________________________________________________________
3
Dual, Low-Dropout, 100mA Linear Regulators
MAX8865T/S/R, MAX8866T/S/R
__________________________________________Typical Operating Characteristics
(V
IN
= +3.6V, C
IN
= 2µF, C
OUT
= 1µF,
SHDN2
= GND, MAX886_S, T
A
= +25°C, unless otherwise noted.)
OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX8865/66-01
SUPPLY CURRENT
vs. LOAD CURRENT
MAX8865/66-02
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
V
OUT1
NO LOAD
MAX8865/66-03
3.00
V
OUT1
2.95
OUTPUT VOLTAGE (V)
2.90
2.85
2.80
2.75
2.70
0
180
160
SUPPLY CURRENT (µA)
140
120
100
80
60
SHDN2 = GND
SHDN2 = V
IN
, I
LOAD2
= 50mA
3.5
3.0
OUTPUT VOLTAGE (V)
2.5
2.0
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)
SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX8865/66-04
TOTAL SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX8865/66-05
OUTPUT VOLTAGE
vs. TEMPERATURE
MAX8865/66-06
100
90
SUPPLY CURRENT (µA)
80
70
60
50
40
30
20
10
0
0
1
2
3
4
5
6
INPUT VOLTAGE (V)
I
LOAD1
= 0mA
ONE REGULATOR ENABLED, NO LOAD
I
LOAD1
= 50mA
200
180
SUPPLY CURRENT (µA)
160
140
120
100
80
60
40
20
0
0
1
2
3
4
5
6
INPUT VOLTAGE (V)
SHDN1 = SHDN2 = V
IN
I
LOAD1
= I
LOAD2
= 50mA
I
LOAD1
= I
LOAD2
= 0mA
3.0
OUTPUT VOLTAGE (V)
2.9
2.8
2.7
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
SUPPLY CURRENT
vs. TEMPERATURE
MAX8865/66-07
DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX8865/66-08
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
70
60
PSRR (dB)
50
40
30
C
OUT
= 1µF
20
10
0
C
OUT
= 10µF
V
OUT
= 2.84V
R
L
= 55Ω
MAX8865/66-09
180
160
SUPPLY CURRENT (µA)
140
120
100
80
60
-40
-20
0
20
40
60
SHDN2 = GND
I
LOAD1
= 50mA
SHDN2 = V
IN
I
LOAD1
= I
LOAD2
= 50mA
140
120
DROPOUT VOLTAGE (mV)
100
80
60
40
20
0
T
A
= +85°C
80
T
A
= +25°C
T
A
= -40°C
80
0
10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
0.01
0.10
TEMPERATURE (°C)
1
10
100
FREQUENCY (kHz)
1000
4
_______________________________________________________________________________________
Dual, Low-Dropout, 100mA Linear Regulators
____________________________Typical Operating Characteristics (continued)
(V
IN
= +3.6V, C
IN
= 2µF, C
OUT
= 1µF,
SHDN2
= GND, MAX886_S, T
A
= +25°C, unless otherwise noted.)
MAX8865T/S/R, MAX8866T/S/R
OUTPUT SPECTRAL NOISE DENSITY
vs. FREQUENCY
OUTPUT SPECTRAL NOISE DENSITY (µV/Hz)
MAX8865/66-10
REGION OF STABLE C
OUT
ESR
vs. LOAD CURRENT
C
OUT
= 1µF
100
MAX8865/66-11
10
R
L
= 55Ω
1000
1
C
OUT
ESR (Ω)
C
OUT
= 1µF
10
INTERNAL FEEDBACK
1
EXTERNAL FEEDBACK
0.1
STABLE REGION
0.1
C
OUT
= 100µF
0.01
0.1
1
10
FREQUENCY (kHz)
100
1000
0.01
0
10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
OUTPUT NOISE DC TO 1MHz
V
OUT
1ms/div
I
LOAD
= 50mA, V
OUT
IS AC COUPLED
LINE-TRANSIENT RESPONSE
LOAD-TRANSIENT RESPONSE
4.6V
V
IN
I
LOAD
3.6V
2.84V
V
OUT
2.83V
2.82V
50mA
0mA
2.85V
V
OUT
2.84V
2.83V
50µs/div
I
LOAD
= 50mA, V
OUT
IS AC COUPLED
10µs/div
V
IN
= 3.60V, I
LOAD
= 0mA to 50mA, C
IN
= 10µF, V
OUT
IS AC COUPLED
_______________________________________________________________________________________
5
嵌入式系统
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
