Document
19-3121; Rev 0; 1/04
KIT ATION EVALU E L B AVAILA
Dual, 300mA, Low-Noise Linear Regulator with Independent Shutdown in UCSP or TDFN
General Description
The MAX8559 dual, low-noise, low-dropout (LDO) linear regulator operates from a 2.5V to 6.5V input voltage and delivers at least 300mA of continuous output current. It offers low output noise and low dropout of only 60mV at 100mA. Typical output noise for this device is 32µVRMS, and PSRR is 70dB at 10kHz. Designed with an internal P-channel MOSFET pass transistor, the MAX8559 maintains a low 115µA supply current per LDO, independent of the load current and dropout voltage. Other features include short-circuit protection and thermal-shutdown protection. The MAX8559 includes two independent logic-controlled shutdown inputs and is capable of operating without a bypass capacitor to further reduce total solution size. The MAX8559 is available in a miniature 8-bump UCSP (2mm x 1mm) or 8-pin TDFN (3mm x 3mm) package. ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦
Features
Two Low-Dropout-Voltage Regulators Low 32µVRMS Output Noise 300mA Output Current for Each LDO 70dB PSRR at 10kHz Independent Shutdown Controls Low 60mV Dropout at 100mA Load 115µA Operating Supply Current per LDO 1.5V to 3.3V Factory-Preset Output Small Ceramic Output Capacitors
MAX8559
♦ Output Current Limit ♦ Thermal-Overload and Short-Circuit Protection ♦ 1.95W Power-Dissipation Capability (TDFN) ♦ 2mm2 Footprint (UCSP)
Applications
Cellular and Cordless Phones PDAs and Palmtop Computers Notebook Computers Digital Cameras PCMCIA Cards Wireless LAN Cards Hand-Held Instruments
PART MAX8559EBAxy*† MAX8559ETAxy*
Ordering Information
TEMP RANGE -40°C to +85°C -40°C to +85°C PIN-PACKAGE 8 UCSP (B8-1) 8 TDFN-EP**
*xy = Output voltage code (see the Output Voltage Selector Guide). **EP = Exposed pad. †Future product—contact factory for availability.
Typical Operating Circuit
OUTA TOP VIEW
Pin Configurations
GND OUTB
INPUT 2.5V TO 6.5V 2.2µF min
INA INB
OUTA
1.5V TO 3.3V 2.2µF/150mA 4.7µF/300mA 1.5V TO 3.3V 2.2µF/150mA 4.7µF/300mA
8
BP
7
6
5
MAX8559ETA
ON OFF ON OFF
SHDNA
MAX8559
OUTB
1 INA
2 SHDNA
3 SHDNB
4 INB
SHDNB GND BP 0.01µF (OPTIONAL)
TDFN 3mm x 3mm
Pin Configurations continued at end of data sheet.
Output Voltage Selector Guide appears at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Dual, 300mA, Low-Noise Linear Regulator with Independent Shutdown in UCSP or TDFN MAX8559
ABSOLUTE MAXIMUM RATINGS
INA, INB, SHDNA, SHDNB, BP to GND ...................-0.3V to +7V INA to INB..............................................................-0.3V to +0.3V OUTA, OUTB to GND ..................................-0.3V to (VIN + 0.3V) Output Short-Circuit Duration.....................................Continuous Continuous Power Dissipation (TA = +70°C) 8-Bump UCSP (derate 4.7mW/°C above +70°C)..........379mW 8-Pin TDFN (derate 24.4mW/°C above +70°C) ..........1951mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C 8-Pin TDFN Lead Temperature (soldering, 10s)..............+300°C 8-Bump UCSP Solder Profile...........................................(Note 1)
Note 1: For UCSP solder profile information, please refer to the application note APP_1891 on the Maxim website, www.maxim-ic.com.
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
(VIN = 3.8V, SHDNA = SHDNB = IN_, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER Input Voltage Undervoltage-Lockout Threshold SYMBOL VIN VUVLO VIN rising, hysteresis is 40mV (typ) TA = +25°C, IOUTA = IOUTB = 1mA Output Voltage Accuracy TA = -40°C to +85°C, IOUTA = IOUTB = 1mA TA = -40°C to +85°C, IOUTA or IOUTB = 0.1mA to 300mA IOUT_ ILIM_ No load Ground Current Dropout Voltage (Note 2) Line Regulation IQ VOUT_ VIN_ ∆VLNR No load, one LDO shutdown IOUTA = IOUTB = 100mA IOUT_ = 1mA IOUT_ = 100mA VIN_ = (VOUT_ + 0.1V) to 6.5V, IOUT_ = 1mA 100Hz to 100kHz, COUT_ = 10µF, IOUT_ = 1mA, CBP = 0.01µF 100Hz to 100kHz, COUT_ = 10µF, IOUT_ = 1mA, CBP = not installed VIN_ = VOUT_ + 1V, 10kHz CBP = 0.01µF, COUT_ = 2.2µF, 100kHz IOUT_ = 50mA TA = +25°C TA = -40°C to +85°C 1.6 0.4 -0.15 CONDITIONS MIN 2.5 2.15 -1 -2 -3 300 310 550 180 115 220 0.6 60 0 32 µVRMS 254 70 dB 54 120 +0.15 mV %/ V 920.