Document
19-1679; Rev 0; 4/00
12V, Ultra-Low-IQ, Low-Dropout Linear Regulators with POK
General Description
The MAX8880/MAX8881 are ultra-low supply current, low-dropout linear regulators, capable of delivering up to 200mA. They are designed for battery-powered applications where reverse battery protection and long battery life are critical. These regulators’ low 3.5µA supply current extends battery life in applications with long standby periods. Unlike PNP-based designs, a 2Ω PMOS device maintains ultra-low supply current throughout the entire operating range and in dropout. The parts are internally protected from output short circuits, reverse battery connection, and thermal overload. An internal powerOK (POK) comparator indicates when the output is out of regulation. The MAX8880 output is adjustable from 1.25V to 5V using an external resistor-divider. The MAX8881 provides only factory-preset output voltages of 1.8V, 2.5V, 3.3V, or 5V (see Ordering Information). Both devices are available in miniature 6-pin SOT23 packages. o 3.5µA Supply Current at 12V o Reverse Battery Protection o 2.5V to 12V Input Voltage Range o ±1.5% Output Voltage Accuracy o 200mA max Output Current o 2Ω PMOS Output Device o Short-Circuit and Thermal Overload Protection o POK Output for Out-of-Regulation Indicator o Fixed 1.8V, 2.5V, 3.3V, and 5V (MAX8881) Adjustable from 1.25V to 5V (MAX8880) o Tiny 6-Pin SOT23 Package
Features
MAX8880/MAX8881
________________________Applications
Smoke Detectors Battery-Powered Alarms Remote Transmitters Smart Battery Packs PDAs Handy Terminals CMOS Backup Power Real-Time Clocks
Typical Operating Circuit
Pin Configuration
TOP VIEW
IN 1 6 POK
VIN 2.5V TO 12V 1µF IN OUT FB VOUT 1.25V TO 5V UP TO 200mA 4.7µF
MAX8881
ON OFF REGULATION OK SHDN GND POK
GND 2
MAX8880 MAX8881
5
SHDN
OUT 3
4
FB
SOT23-6
Ordering Information
PART MAX8880 EUT-T MAX8881 EUT18-T MAX8881EUT25-T MAX8881EUT33-T MAX8881EUT50-T OUTPUT Adjustable 1.8V 2.5V 3.3V 5.0V 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 PIN-PACKAGE 6 SOT23-6 6 SOT23-6 6 SOT23-6 6 SOT23-6 6 SOT23-6 TOP MARK AAHR AAHS AAHT AAHU AAHV
________________________________________________________________ Maxim Integrated Products
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12V, Ultra-Low-IQ, Low-Dropout Linear Regulators with POK MAX8880/MAX8881
ABSOLUTE MAXIMUM RATINGS
IN to GND ................................................................-14V to +14V SHDN to GND .............................................-0.3V to (VIN + 0.3V), -0.3V to +0.3V when VIN < 0V OUT, FB to GND...............................-0.3V to +6V when VIN > 5.7V, -0.3V to (VIN + 0.3V) when 0V ≤ VIN ≤ 5.7V, -0.3V to +0.3V when VIN < 0V POK to GND ...........................................................-0.3V to +14V OUT Continuous Current...................................................200mA OUT Short Circuit...........................................................Indefinite Continuous Power Dissipation (TA = +70°C) 6-Pin SOT23 (derate 8.7mW/°C above +70°C)...........696mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature.........................................-65°C to +165°C Lead Temperature (soldering, 10s) .................................+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
(VIN = VOUT + 1V, SHDN = IN, COUT = 4.7µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER Input Voltage Range Supply Current Shutdown Supply Current Input Undervoltage Lockout FB Voltage, Adjustable Mode SYMBOL VIN IIN IIN(SHDN) VUVLO VFB MAX8880, IOUT = 20mA TA = +25°C TA = 0°C to +85°C TA = -40°C to +85°C TA = +25°C TA = 0°C to +85°C TA = -40°C to +85°C 1.238 1.232 1.219 -1.5 -2 -3 1.25 0.01 0.006 200 IOUT = 50mA VIN = -12V, V SHDN = 0 VIN = 5V, VOUT = 0 VIN = 2.5V to 12V V SHDN = 0 to 12V, TA = +25°C IFB FB = 1.25V, TA = +25°C, MAX8880 only Falling TA = +25°C TA = -40°C to +85°C Hysteresis POK Off-Current POK Low Voltage IPOK VPOK VPOK = 12V, TA = +25°C IPOK = 1mA 50 2 0.5 -100 0 87.5 86 1.5 100 200 2 90.5 100 20 93.5 95 250 400 100 200 1 VIN = 12V V SHDN = 0, VIN = 12V, VOUT = 0, TA = +25°C CONDITIONS MIN 2.5 3.5 1.5 2.1 1.257 TYP MAX 12 10 3 2.4 1.276 1.282 1.295 1.5 2 3 5.5 0.05 0.015 V %/V %/mA mA mV mA mA V nA nA % of VOUT nA mV % V UNITS V µA µA V
OUT Voltage Accuracy (Note 2) OUT Voltage Range OUT Lin.