MAX8634:Dual 300mA Pin-Programmable Low-Dropout Linear Regulators with Reset or Low-Noise Output in a Tiny 2mm x 2mm µDFN Package

Industry's Smallest, Dual Low-Dropout Linear Regulators Designed for Low-Noise, Space-Sensitive Applications Where Flexibility and Integration are Necessary

The MAX8633–MAX8636 offer low-dropout (LDO) voltage and ultra-low-power regulation in a subminiaturized 2mm x 2mm µDFN package. The devices operate from a 2.7V to 5.5V supply and deliver up to 300mA from each output, with a typical dropout voltage of 90mV at 100mA load current. Each device is designed with internal p-channel MOSFET pass transistors to ensure a low-quiescent supply current of 54µA (typical, both LDOs on). Other features include low-noise operation (MAX8634/MAX8636), output current limiting, and thermal shutdown. The MAX8633 features an open-drain, active-low RESET output to monitor OUT2, eliminating external components and adjustments. The MAX8633 asserts an active-low RESET signal (120ms minimum timeout) when VOUT2 drops below 87% of the nominal output voltage. The MAX8634/MAX8636 feature a noise bypass input to the internal reference for low output noise (45µVRMS typ). The MAX8634/MAX8635 provide independent active-low SHDN inputs for disabling the regulators, while the MAX8633/MAX8636 provide a single active-low SHDN input for disabling both regulators. The MAX8633/MAX8635/MAX8636 have two logic inputs that select one of nine preset output-voltage combinations, eliminating external 1% resistors, as well as inventory burden. The MAX8634 has one logic input to select three output-voltage options. The MAX8633–MAX8636 are available in an 8-pin, 2mm x 2mm µDFN package for minimizing footprint, and an 8-pin, 3mm x 3mm TDFN package for higher power dissipation. The devices are specified over the extended temperature range (-40°C to +85°C). All packages are lead free.

Key Features
  • Pin-Programmable Output Voltages
  • 300mA Output Current
  • Low 90mV Dropout at 100mA Load
  • Open-Drain, Active-Low RESET (MAX8633)
  • Low 45µVRMS Output Noise (MAX8634/MAX8636)
  • Low 54µA Quiescent Supply Current
  • Low < 1µA Maximum Shutdown Current
  • Output Current Limit
  • Thermal Shutdown
MAX8633, MAX8634, MAX8635, MAX8636: Typical Operating Circuit
MAX8633, MAX8634, MAX8635, MAX8636: Typical Operating Circuit
Applications/Uses
  • Cellular and Cordless Phones
  • Handheld Instruments
  • Notebook Computers
  • PDAs and Digital Cameras
  • Small LCD Displays
  • Wireless LAN Cards
DataSheet
titleDownload file
MAX8633-MAX8636 Data SheetMAX8633-MAX8636.pdf
Parametrics
Part NumberRegulatorsVIN
(V)
VIN
(V)
Preset VOUT
(V)
VDROPOUT @Rated ILOAD
(V)
Rated ILOAD
(mA)
Rated ILOAD
(mA)
ICC
(µA)
Output Voltage Noise
(µV RMS)
Ref. BypassLow Batt./ Pwr. Fail OutPOK/Reset Thresh.
(V)
WatchdogReverse Batt. Protect.Oper. Temp.
(°C)
Package/PinsBudgetary
Price
minmaxtypmaxtypnomSee Notes
MAX863322.75.51.5
1.6
1.8
1.85
2.6
2.8
2.9
3
0.2530030075450NoNoVout-13%NoNo-40 to +85µDFN/8
TDFN-EP/8
-
MAX86342.6
2.85
3
45Yes-µDFN/8
TDFN-EP/8
-
MAX86351.5
1.8
2.5
2.6
2.8
2.85
2.9
3
450No-µDFN/8
TDFN-EP/8
-
MAX86361.5
1.8
2.5
2.6
2.8
2.85
2.9
3
45Yes-µDFN/8
TDFN-EP/8
$0.67 @1k
Design kits & evaluation modules
Related Products
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  • MAX8510:Ultra-Low-Noise, High PSRR, Low-Dropout, 120mA Linear Regulators
  • MAX8511:Ultra-Low-Noise, High PSRR, Low-Dropout, 120mA Linear Regulators
  • MAX8882:Dual, Low-Noise, Low-Dropout, 160mA Linear Regulators in SOT23
  • MAX8883:Dual, Low-Noise, Low-Dropout, 160mA Linear Regulators in SOT23
  • MAX8868:Low-Noise, Low-Dropout, 150mA Linear Regulators in SOT23
  • MAX8867:Low-Noise, Low-Dropout, 150mA Linear Regulators in SOT23
  • MAX8877:Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout
  • MAX8878:Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX8634ELA+TNo Longer AvailableµDFN,;8 pin;4.2 mm²-40°C to +85°CLead Free
MAX8634ETA+TActiveTDFN-EP,;8 pin;9.6 mm²-40°C to +85°CLead Free
MAX8633-MAX8636.pdf MAX8636
典型工作电路 MAX8636