Document
MAX8863T/S/R, MAX8864T/S/R
Low-Dropout, 120mA Linear Regulators
General Description
The MAX8863T/S/R and MAX8864T/S/R low-dropout linear regulators operate from a +2.5V to +6.5V input range and deliver up to 120mA. A PMOS pass transistor allows the low, 80μA supply current to remain independent 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 output 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 features include low-power shutdown, short-circuit protection, thermal shutdown protection, and reverse battery protection. The MAX8864 also includes an auto-discharge function, which actively discharges the output voltage to ground when the device is placed in shutdown mode. Both devices come in a miniature 5-pin SOT23 package.
Applications
●● Cordless Telephones ●● PCS Telephones ●● Cellular Telephones ●● PCMCIA Cards ●● Modems ●● Hand-Held Instruments ●● Palmtop Computers ●● Electronic Planners
Typical Operating Circuit
Benefits and Features
●● Low Cost
●● Low, 55mV Dropout Voltage at 50mA IOUT ●● Low, 68μA No-Load Supply Current
Low, 80μA Operating Supply Current (even in dropout)
●● Low, 350μVRMS Output Noise ●● Miniature External Components
●● Thermal Overload Protection
●● Output Current Limit
●● Reverse Battery Protection
●● Dual Mode Operation: Fixed or Adjustable (1.25V to 6.5V) Output
●● Low-Power Shutdown
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX8863TEUK+T
-40°C to +85°C
5 SOT23
MAX8863TMUK/PR3+T -55°C to +125°C
5 SOT23
MAX8863SEUK+T
-40°C to +85°C
5 SOT23
MAX8863REUK+T
-40°C to +85°C
5 SOT23
MAX8864TEUK+T
-40°C to +85°C
5 SOT23
MAX8864SEUK+T
-40°C to +85°C
5 SOT23
MAX8864REUK+T
-40°C to +85°C
5 SOT23
*Alternate marking information: CY_ _ = MAX8863T, CZ_ _ = MAX8863S, DA_ _ = MAX8864T, DB_ _ = MAX8864S +Denotes a lead(Pb)-free/RoHS-compliant package.
Pin Configuration
BATTERY
CIN 1µF
IN OUT
MAX8863 MAX8864
SHDN
GND SET
OUTPUT VOLTAGE
COUT 1µF
Dual Mode is a trademark of Maxim Integrated Products, Inc.
TOP VIEW
+ SHDN 1
5 SET
GND 2
MAX8863 MAX8864
IN 3
4 OUT
SOT23
19-0466; Rev 6; 5/16
MAX8863T/S/R, MAX8864T/S/R
Low-Dropout, 120mA Linear Regulators
Absolute Maximum Ratings
VIN 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 (VIN + 0.3V) Continuous Power Dissipation (multilayer board, TA = +70°C)
SOT23 (3.9mW/°C above +70°C).............................312.6mW
Operating Temperature Range............................ -40°C to +85°C Operating Temperature
Range (MAX8863TMUK/PR3+).................... -55°C to +125°C Junction Temperature.......................................................+150°C Storage Temperature Range............................. -65°C to +150°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 (θJA)......255.9°C/W Junction-to-Case Thermal Resistance (θJC)................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.maximintegrated.com/thermal-tutorial.
Electrical Characteristics
(VIN = +3.6V, VGND = 0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER Input Voltage (Note 3)
Output Voltage
SYMBOL VIN
VOUT
CONDITIONS
0mA ≤ IOUT ≤ 50mA, SET = GND
MAX886_T MAX886_S MAX886_R
MIN 2.5 3.05 2.75 2.70
TYP
3.15 2.84 2.80
MAX 6.5 3.25 2.93 2.88
Adjustable Output Voltage Range (Note 4)
VOUT
VSET
6.5
Maximum Output Current Current Limit (Note 5) Ground Pin Current
Dropout Voltage (Note 6)
Line Regulation
Load Regulation
Output Voltage Noise SHUTDOWN SHDN Inpu.