19-1117; Rev 0; 8/96
Low-Cost, Low-Dropout, Dual Linear Regulator
_______________General Description
The MAX8862 low-cost, low-dropout, dual linear voltage
regulator is ideal for battery-powered and portable
applications. The regulators have independent supply
inputs and provide 250mA and 100mA, respectively,
with a full-load dropout voltage of 160mV. Both regula-
tors use P-channel MOSFET pass transistors and main-
tain low quiescent current independent of load current.
In dropout, the MOSFET does not suffer from excessive
base currents, as do saturated PNP transistors.
The MAX8862 output voltage is preset to 4.95V (L),
3.175V (T), or 2.85V (R). This device employs Dual
Mode™ operation, allowing user-adjustable outputs
from +2V to +11V with external resistors. The input
supply-voltage range is 2.5V to 11.5V. Other features
include independent shutdown, power-good indicator,
short-circuit and reverse-battery protection, and ther-
mal shutdown.
The MAX8862’s regulators are ideal power supplies for
the radio and the microcontroller (µC) used in digital,
cordless, and PCS phones. The main regulator is opti-
mized for superior transient and dynamic response,
while the secondary regulator exhibits low-output, wide-
band noise.
The MAX8862 comes in a 16-pin SO package with a
lead frame that uses multiple GND pins as a heat sink
for additional thermal dissipation.
____________________________Features
o
Low Cost
o
Guaranteed 250mA and 100mA Output Currents,
with Current Limiting
o
Dual Mode Operation:
Fixed or Adjustable Output from +2V to +11V
o
+2.5V to +11.5V Input Range
o
160mV Dropout Voltage at 200mA Output Current
o
Low Supply Current—Even in Dropout
200µA Operating
<1µA Shutdown
o
Power-Good Indicator
o
Reverse-Battery Protection
o
Thermal Overload Protection
MAX8862
______________Ordering Information
PART*
MAX8862_ESE
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
16 Narrow SO
*Insert the desired suffix letter (from the table below) into the
blank to complete the part number.
SUFFIX
L
T
R
FIXED OUTPUT VOLTAGE (V)
4.95
3.175
2.85
________________________Applications
Cellular Phones
PCS Phones
Modems
Electronic Planners
Cordless Phones
PCMCIA Cards
Hand-Held Instruments
__________________Pin Configuration
TOP VIEW
__________Typical Operating Circuit
INPUT 1
2.5V TO 11.5V
1µF
OUTPUT 1
AT 250mA
3.3µF
100k
PWROK1
REF2
0.1µF
IN1
SHDN1
IN2
SHDN2
1µF
OUTPUT 2
AT 100mA
2.2µF
INPUT 2
2.5V TO 11.5V
IN1 1
SHDN1 2
PWROK1 3
16 N.C.
15 SET1
14 OUT1
MAX8862
OUT1
OUT2
GND 4
GND 5
OUT2 6
SET2 7
N.C. 8
MAX8862
13 GND
12 GND
11 REF2
10 SHDN2
9
IN2
GND SET1 SET2 GND
Narrow SO
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
Low-Cost, Low-Dropout, Dual Linear Regulator
MAX8862
ABSOLUTE MAXIMUM RATINGS
IN1, IN2 to GND (Note 1).....................................................±12V
SET1,
SHDN1,
PWROK1 to GND.............. -0.3V to (V
IN1
+ 0.3V)
SET2,
SHDN2,
REF2 to GND ....................... -0.3V, (V
IN2
+ 0.3V)
Output Short-Circuit Duration ............................................Infinite
Continuous Power Dissipation (T
A
= +70°C)
16-Pin Narrow SO (derate 20mW/°C above +70°C) ............... 1W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature .....................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) ............................ +300°C
Note 1:
Connect
SHDN1
to IN1 and
SHDN2
to IN2 through 20kΩ resistors to limit current flow in case a battery is reversed.
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 (Notes 2, 3)
(V
IN_
= V
OUT_(TYP)
+ 1V,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Input Voltage Range
Output Voltage
Output Voltage Range
Maximum Output Current
Current Limit
Quiescent Current
Shutdown Supply Current
V
IN1
= V
IN2
= 11.5V
I
OUT1
= I
OUT2
= 1mA
I
OUT1
= 200mA, MAX8862L/T
Dropout Voltage (Note 4)
I
OUT2
= 100mA, MAX8862L/T
I
OUT1
= 200mA, MAX8862R
I
OUT2
= 100mA, MAX8862R
I
OUT1
= I
OUT2
= 15mA
Line Regulation
V
IN2
= (V
OUT2 (TYP)
+ 1V)
to 11.5V
Load Regulation
I
OUT1
= 0mA to 250mA, C
OUT1
= 3.3µF
I
OUT2
= 0mA to 100mA, C
OUT2
= 2.2µF
C
OUT2
= 2.2µF
Z
OUT2
= 10mA
C
OUT2
= 100µF
Z
OUT2
= 10mA
REFERENCE
REF2 Output Voltage
REF2 Line Regulation
REF2 Load Regulation
2
C
REF2
= 0.1µF
V
IN2
= 2.5V to 11.5V
I
REF2
= 0µA to 10µA
1.230
1.250
1
6
1.270
V
mV
mV
10Hz < f < 100kHz
10Hz < f < 1MHz
10Hz < f < 100kHz
10Hz < f < 1MHz
0.02
0.015
0.02
277
875
211
667
0.08
%/mA
µVRMS
mV
RMS
V
IN1
= (V
OUT1 (TYP)
+ 1V)
to 11.5V
V
IN1
= 2.5V min, V
OUT1
= 2V
V
IN2
= 2.5V min, V
OUT2
= 2V
I
OUT1
I
OUT2
0mA < I
OUT1
≤
250mA,
0mA < I
OUT2
≤
100mA
MAX8862L
MAX8862T
MAX8862R
CONDITIONS
MIN
2.5
4.80
3.050
2.75
2
250
100
580
250
200
0.01
1.5
160
160
165
180
0.03
330
350
350
400
0.1
%/V
mV
330
1
4.95
3.175
2.85
TYP
MAX
11.5
5.15
3.300
2.95
11
V
mA
mA
µA
µA
V
UNITS
V
OUT2 Voltage Noise
_______________________________________________________________________________________
Low-Cost, Low-Dropout, Dual Linear Regulator
ELECTRICAL CHARACTERISTICS (Notes 2, 3)
(V
IN_
= V
OUT_(TYP)
+ 1V,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
PWROK1 OUTPUT
PWROK1 Trip Voltage
PWROK1 Hysteresis
PWROK1 Leakage Current
PWROK1 Low Voltage
Falling edge at SET1
Rising edge at SET1
V
PWROK1
= 11.5V
I
SINK
= 0.5mA
Shutdown mode, V
IN_
= V
OUT_(TYP)
+ 1V to 11.5V
Active mode, V
IN_
= 11.5V
V
SHDN_
= 11.5V
SET_ = OUT_, I
OUT1
= I
OUT2
= 15mA
V
SET_
= 1.30V
Internal feedback
External feedback
250
1.23
1.8
0.01
1
1.175
1.200
15
0.01
25
1
200
0.45
1.225
V
mV
µA
mV
V
V
µA
CONDITIONS
MIN
TYP
MAX
UNITS
MAX8862
SHDN
SHDN_
Logic Low
SHDN_
Logic High
SHDN_
Leakage Current
SET_ INPUT
SET_ Reference Voltage
SET_ Input Bias Current
SET_ Threshold
THERMAL PROTECTION
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
1.25
0.01
1.28
0.1
40
V
µA
mV
160
20
°C
ELECTRICAL CHARACTERISTICS (Notes 2, 3)
(V
IN_
= V
OUT_(TYP)
+ 1V,
T
A
= -40°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Input Voltage Range
Output Voltage
Output Voltage Range
Maximum Output Current
Current Limit
Quiescent Current
Shutdown Supply Current
V
IN1
= V
IN2
= 11.5V
I
OUT1
= I
OUT2
= 1mA
I
OUT1
= 200mA, MAX8862L/T
Dropout Voltage (Note 4)
I
OUT2
= 100mA, MAX8862L/T
I
OUT1
= 200mA, MAX8862R
I
OUT2
= 100mA, MAX8862R
V
IN1
= 2.5V min, V
OUT1
= 2V
V
IN2
= 2.5V min, V
OUT2
= 2V
I
OUT1
I
OUT2
0mA < I
OUT1
≤
250mA,
0mA < I
OUT2
≤
100mA
MAX8862L
MAX8862T
MAX8862R
CONDITIONS
MIN
2.5
4.80
3.050
2.740
2
250
100
580
250
200
0.01
1.5
160
160
165
180
330
350
350
400
3
mV
330
1
4.95
3.175
2.85
TYP
MAX
11.5
5.15
3.300
2.960
11
V
mA
mA
µA
µA
V
UNITS
V
_______________________________________________________________________________________
Low-Cost, Low-Dropout, Dual Linear Regulator
MAX8862
ELECTRICAL CHARACTERISTICS (Notes 2, 3) (continued)
(V
IN_
= V
OUT_(TYP)
+ 1V,
T
A
= -40°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
CONDITIONS
I
OUT1
= I
OUT2
= 15mA
Line Regulation
V
IN2
= (V
OUT2 (TYP)
+ 1V)
to 11.5V
Load Regulation
I
OUT1
= 0 to 250mA, C
OUT1
= 3.3µF
C
OUT2
= 2.2µF, 10Hz < f < 1MHz, I
OUT2
= 10mA
C = 2.2µF, Z
OUT2
= 10mA
OUT2 Voltage Noise
C = 100µF, Z
OUT2
= 10mA
REFERENCE
REF2 Output Voltage
REF2 Line Regulation
REF2 Load Regulation
PWROK1 OUTPUT
PWROK1 Trip Voltage
PWROK1 Hysteresis
PWROK1 Leakage Current
PWROK1 Low Voltage
Falling edge at SET1
Rising edge at SET1
V
PWROK1
= 11.5V
I
SINK
= 0.5mA
Shutdown mode, V
IN_
= V
OUT_(TYP)
+ 1V to 11.5V
Active mode, V
IN_
= 11.5V
V
SHDN_
= 11.5V
SET_ = OUT_, I
OUT1
= I
OUT2
= 15mA
V
SET_
= 1.30V
Internal feedback
External feedback
250
160
10
1.220
2.0
0.02
1.250
0.01
1
1.290
0.1
30
1.165
1.200
15
0.01
25
1
200
0.45
1.235
V
mV
µA
mV
V
V
µA
V
µA
mV
C
REF2
= 0.1µF
V
IN2
= 2.5V to 11.5V
I
REF2
= 0µA to 10µA
1.217
1.250
1
6
1.277
V
mV
mV
10Hz < f < 100kHz
10Hz < f < 1MHz
10Hz < f < 100kHz
10Hz < f < 1MHz
-
-
-
-
0.02
0.015
0.02
277
875
211
667
-
-
-
-
µV
RMS
0.10
%/mA
V
IN1
= (V
OUT1 (TYP)
+ 1V)
to 11.5V
MIN
TYP
0.03
MAX
0.12
%/V
UNITS
SHDN
SHDN_
Logic Low
SHDN_
Logic High
SHDN_
Leakage Current
SET_ INPUT
SET_ Reference Voltage
SET_ Input Bias Current
SET_ Threshold
THERMAL PROTECTION
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
°C
Note 2:
Guaranteed by design for T
A
= -40°C.
Note 3:
Guaranteed for a junction temperature (T
J
) equal to the operating temperature range. E-grade parts are guaranteed by
design to operate up to T
J
= +125°C. For T
J
above +125°C, specifications exceed the operating limits.
Note 4:
Dropout voltage is (V
IN
_ - V
OUT
_) when V
OUT
_ falls to 100mV below its nominal value at V
IN
_ = (V
OUT
_ + 1V). For example,
the MAX8862 is tested by measuring the V
OUT
_ at (V
IN_
= 5.95V for the MAX8862L, V
IN_
= 4.175V for the MAX8862T, and
V
IN_
= 3.85V for the MAX8862R) then V
IN_
is lowered until V
OUT_
falls 100mV below the measured value.
4
_______________________________________________________________________________________
Low-Cost, Low-Dropout, Dual Linear Regulator
__________________________________________Typical Operating Characteristics
(V
IN1
= V
IN2
= 5.3V, C
IN1
= C
IN2
= 1µF, C
OUT1
= 3.3µF, C
OUT2
= 2.2µF,
SHDN1
= IN1,
SHDN2
= IN2. T
A
= +25°C, unless
otherwise noted.)
QUIESCENT CURRENT
vs. TEMPERATURE
MAX8862 TOC02
MAX8862
QUIESCENT CURRENT
vs. LOAD CURRENT
MAX8862 TOC03
SHUTDOWN CURRENT
vs. TEMPERATURE
MAX8862 TOC01
260
240
QUIESCENT CURRENT (µA)
220
200
180
160
140
120
100
-40
-20
40
60
20
TEMPERATURE (°C)
0
80
V
IN1
= V
IN2
= 7V
V
IN1
= V
IN2
= 12V
120
120
100
80
V
IN1
= V
IN2
= 12V
60
40
20
V
IN1
= V
IN2
= 7V
0
-40
QUIESCENT CURRENT (µA)
110
I
Q2
100
I
Q1
90
100
80
0.001 0.01
10
1
0.1
LOAD CURRENT (mA)
SHUTDOWN CURRENT (nA)
100
1000
-20
0
20
40
60
80
100
TEMPERATURE (°C)
OUTPUT VOLTAGE
vs. TEMPERATURE
MAX8862TOC06
OUTPUT VOLTAGE
vs. LOAD CURRENT
NORMALIZED OUTPUT VOLTAGE (%)
MAX8862TOC04
MAX8862T
OUTPUT VOLTAGE & QUIESCENT CURRENT
vs. SUPPLY VOLTAGE
MAX8862TOC05
3.27
3.26
OUTPUT VOLTAGE (V)
3.25
3.24
OUT2
3.23
3.22
3.21
3.20
-40
-20
40
60
TEMPERATURE (°C)
0
20
80
OUT1
101
100
V
OUT1
99
98
97
96
95
0.001
V
OUT2
4
V
OUT1
/V
OUT2
OUTPUT VOLTAGE (V)
3
260
240
220
200
QUIESCENT CURRENT (µA)
2
(I
Q1
+ I
Q2
)
180
160
1
140
120
0
0.01
10
1
0.1
LOAD CURRENT (mA)
100
1000
2
3
4
6 7 8 9 10 11
SUPPLY VOLTAGE (V)
5
12
100
100
DROPOUT VOLTAGE
vs. LOAD CURRENT
525
DROPOUT VOLTAGE (mV)
450
OUT2
375
300
225
OUT1
150
75
0
0
40
80
120 160 200 240 280 320
MAX8862TOC07
OVERSHOOT AND TIME
EXITING SHUTDOWN MODE
MAX8862TOC14
600
1V/div
A
0V
1V/div
B
0V
20µs/div
V
IN1
= 5.3V, I
OUT1
= 5mA
A = SHDN1, 0.8V TO 2.4V, 1V/div
B = OUT1, 1V/div
LOAD CURRENT (mA)
_______________________________________________________________________________________
5
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
