MAX1982/MAX1983 19-2560 Rev 1 10/08 Low-Voltage, Low-Dropout Linear Regulators with External Bias Supply General Description Features The MAX1982/MAX1983 are low-voltage, low-dropout Low-Cost 1.2V, 300mA VID Supply linear regulators with an external bias supply input. The 3% Output Voltage Accuracy 5V bias supply drives the gate of the internal N-channel No Minimum Load Current Required pass transistor, making these devices ideal for applica- tions that require low-voltage outputs from low-voltage 1.25V to 5.5V Input Supply Voltage inputs. The MAX1982 delivers 1.2V (3%) at 300mA 5V Input Bias Supply Voltage from an input voltage of 1.25V to 5.5V. The MAX1983 Power-Good (PGOOD) Open-Drain Output with delivers an adjustable output voltage from 0.8V to 2V. 1ms Rising Edge Propagation Delay (MAX1982) The MAX1982/MAX1983 include a current-limit and Adjustable Output Voltage (MAX1983) thermal shutdown that protects the regulator in the event of a fault condition. Both devices are offered in a Low Supply Current (I + I = 165A typ) BIAS IN 6-pin SOT23 package and are specified over the 5A (max) Shutdown Supply Current extended (-40C to +85C) temperature range. Tiny 6-Pin SOT23 Package Applications Ordering Information Notebook Computers VID Power Supplies PIN- TOP PART TEMP RANGE PACKAGE MARK PDAs MAX1982EUT-T -40C to +85C 6 SOT23-6 ABEA Cell Phones MAX1983EUT-T -40C to +85C 6 SOT23-6 ABEB Low-Dropout Regulators with External Bias MAX1982EUT+T -40C to +85C 6 SOT23-6 ABEA+ Supply MAX1983EUT+T -40C to +85C 6 SOT23-6 ABEB+ +Denotes lead(Pb)-free package/RoHS-compliant package. Typical Operating Circuit Pin Configurations TOP VIEW 4.5V TO 5.5V 1.25V TO 5.5V BIAS IN BIAS16 IN MAX1982 10F 0.1F MAX1982 GND 2 5 OUT 1.2V GND OUT SHDN34 PGOOD 10F ON PGOOD SOT23 SHDN PGOOD Fixed Output Voltage OFF 100k BIAS16 IN MAX1983 GND 2 5 OUT SHDN34 ADJ SOT23 Adjustable Output Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLELow-Voltage, Low-Dropout Linear Regulators with External Bias Supply ABSOLUTE MAXIMUM RATINGS ADJ, IN, BIAS, PGOOD, SHDN, OUT to GND..........-0.3V to +6V Junction Temperature......................................................+150C o Storage Temperature Range.............................-65 C to +150C Output Short-Circuit Duration ............................................Infinite Continuous Power Dissipation (T = +70C) Lead Temperature (soldering, 10s) .................................+300C A o 6-Pin SOT23 (derate 8.7mW/ C above +70C)............696mW Operating Temperature Range ...........................-40C to +85C 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 (Circuit of Figure 3, V = 1.8V, I = 1mA, C = 10F, T = 0C to +85C, unless otherwise noted. Typical values are at IN LOAD LOAD A T = +25C.) (Note 1) A PARAMETER SYMB O L CONDITIONS MIN TYP MAX UNITS Input Voltage V 1.25 5.5 V IN BIAS Voltage V 4.5 5.5 V BIAS V Voltage Range V MAX1983 0.8 2.0 V OUT OUT BIAS Input Undervoltage Lockout 3.8 4.1 4.35 V Shutdown Supply Current I 1.25V < V < 5.5V 1 5 A IN IN Quiescent BIAS Current I 4.5V < V < 5.5V 140 250 A Q BIAS Shutdown BIAS Current I 4.5V < V < 5.5V 1 5 A SHDN BIAS MAX1982: V = open, V = 1.20V 30 IN OUT V Input Bias Current A OUT MAX1983: V = open, 0.8V < V < 2.0V 2 IN OUT 0V < V < 2.0V ADJ MAX1983 ADJ Input Current 1A REGULATOR CHARACTERISTICS V / OUT Line Regulation I = 10mA, 1.5V < V < 5.5V -0.15 +0.15 %/V LOAD IN V IN T = +25C, I = 100mA -1 +1 A OUT MAX1982 1.20V V % OUT T = 0C to +85C, I = 1mA to 300mA, A OUT Output Voltage Accuracy -3 +3 V + 0.5V < V < 5.5V OUT IN T = +25C, I = 100mA -1 +1 A OUT MAX1983 0.80V V % OUT T = 0C to +85C, I = 1mA to 300mA, A OUT Output Voltage Accuracy -3 +3 V + 0.5V < V < 5.5V OUT IN I = 300mA 350 LOAD Dropout Voltage V mV DO I = 150mA 175 LOAD Current Limit I V - V = 1.3V 330 600 1400 mA LIM IN OUT Thermal-Shutdown Temperature T 160 C SHDN Thermal-Shutdown Hysteresis 20 C RMS Output Noise 10Hz to 100kHz 65 V RMS PGOOD COMPARATOR Comparator Threshold % of regulated output voltage -12.5 -9 -6 % Comparator Hysteresis V 10 mV HYST 2 MAX1982/MAX1983