19-1225; Rev 2; 1/98 High-Voltage, Low-Power Linear Regulators for Notebook Computers ____________________________Features ♦ 4V to 28V Input Range Despite a miserly 8µA (max) no-load supply current, the MAX1615/MAX1616 have excellent line-transient response and AC power-supply rejection ratio. They provide a clean, fixed 5V or 3.3V output (MAX1615) or an adjustable 1.24V to 28V output (MAX1616), even when subjected to fast supply-voltage changes that occur during the switchover from battery to AC adapter input power. The space-saving SOT23-5 package has excellent thermal characteristics and tolerates up to 571mW of power dissipation. Fault protection is provided by internal foldback current limiting and thermalshutdown circuitry. ________________________Applications CMOS/RTC Backup Power Microcontroller Power ♦ 8µA (max) Quiescent Supply Current ♦ <1µA Shutdown Supply Current ♦ 3.3V or 5V, Pin-Selectable Output (MAX1615) Adjustable 1.24V to 28V Output (MAX1616) ♦ 30mA Output Current ♦ ±2% Initial Output Accuracy ♦ Thermal-Overload Protection ♦ 5-Pin SOT23 Package ♦ Low Cost _______________Ordering Information PART Notebook Computers Smart-Battery Packs TEMP. RANGE PINSOT PACKAGE TOP MARK MAX1615EUK-T -40°C to +85°C 5 SOT23-5 ABZD MAX1616EUK-T -40°C to +85°C 5 SOT23-5 ABZE PDAs and Handy-Terminals Battery-Powered Systems ____________Typical Operating Circuit ___________________Pin Configuration TOP VIEW OUT IN OUTPUT VOLTAGE IN 1 MAX1615 BATTERY CIN 0.1µF COUT 4.7µF SHDN GND GND 2 5 SHDN 4 5/3 (FB) MAX1615 MAX1616 5/3 OUT 3 SOT23-5 ( ) ARE FOR MAX1616. ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 For small orders, phone 408-737-7600 ext. 3468. MAX1615/MAX1616 ________________General Description The MAX1615/MAX1616 are micropower, SOT23-5 linear regulators that supply always-on, keep-alive power to CMOS RAM and microcontrollers (µCs) in systems with high-voltage batteries. Key features include wide input voltage range, low dropout voltage, and low quiescent supply current. MAX1615/MAX1616 High-Voltage, Low-Power Linear Regulators for Notebook Computers ABSOLUTE MAXIMUM RATINGS IN to GND .................................................................-0.3V to 30V Terminal Voltages to GND SHDN to GND ...........................................-0.3V to (VIN + 0.3V) 5/3 to GND ............................................-0.3V to (VOUT + 0.3V) FB (MAX1616) to GND .........................-0.3V to (VOUT + 0.3V) OUT to GND...........................................................-0.3V to 30V OUT Short-Circuit to GND ...............................................30sec Continuous OUT Current.....................................................40mA Continuous Power Dissipation (TA = +70°C) (Note 1) SOT23-5 (derate 7.1mW/°C above +70°C)...................571mW Operating Temperature Range MAX161_EUK-T ...............................................-40°C to +85°C Storage Temperature Range .............................-65°C to +160°C Lead Temperature (soldering, 10sec) .............................+300°C Note 1: See Operating Region and Power Dissipation section. 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 = 15V, SHDN = VIN, ILOAD = 5µA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2) PARAMETER Input Voltage Range Supply Current SYMBOL CONDITIONS VIN IIN MIN TYP 4 SHDN = IN, TA = +25°C 6.2 SHDN = IN, VIN = 6V to 28V, TA = TMIN to TMAX IIN Dropout Voltage SHDN = GND (shutdown mode) Output set to 5V, VIN = 4V ILOAD = 1mA, TA = +25°C, VIN = 6V to 28V Output Voltage (MAX1615) (Note 3) FB Input Current (MAX1616) 28 V 8 5 Dropout Supply Current FB Threshold (MAX1616) (Note 3) UNITS 15 Minimum Load Current Shutdown Supply Current MAX ILOAD = 5µA to 30mA, TA = TMIN to TMAX, VIN = 6V to 28V VFBT IFB ∆VDO FB = OUT, VIN = 6V to 28V TA = +25°C 1.5 TMIN = TMIN to TMAX 3 TA = +25°C 70 µA µA µA µA 5/3 = GND 3.26 3.33 3.40 5/3 = OUT 4.95 5.05 5.15 5/3 = GND 3.15 3.48 5/3 = OUT 4.75 5.25 TA = +25°C, ILOAD = 1mA 1.215 TA = TMIN to TMAX, ILOAD = 5µA to 30mA 1.18 V VFB = 1.3V -10 1.240 12 ILOAD = 30mA (Note 4) 1.265 1.28 V V 30 nA 350 mV Output Current Limit VIN = 6V 100 mA OUT Reverse Leakage Current IN = unconnected, VOUT forced to 5V 70 µA Capacitive Load Requirements (Note 5) 2 0.16 MAX1616 0.23 µF/mA Rising edge of IN or SHDN to OUT within specification limits, RL = 500Ω, COUT = 6.8µF, VOUT set to 5V Start-Up Time Response Start-Up Overshoot MAX1615 VOSH RL = 500Ω, COUT = 10µF within 90% of nominal output voltage 1 0.5 _______________________________________________________________________________________ ms %VOUT High-Voltage, Low-Power Linear Regulators for Notebook Computers (VIN = 15V, SHDN = VIN, ILOAD = 5µA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX VIL SHDN Input Threshold Voltage VIH V 1.4 SHDN Input Current V SHDN = 0V or 15V Thermal-Shutdown Temperature UNITS 0.25 TSHDN -1 1 V SHDN = 0V or 15V, hysteresis = +20°C µA 150 °C Note 2: Limits are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed through correlation using standard quality-control (SQC) methods. Note 3: Pulse tested at VIN = 28V, ILOAD = 30mA to avoid exceeding package power-dissipation limits. Note 4: Guaranteed by design. Tested with VOUT set to 5V. Dropout voltage is tested by reducing the input voltage until VOUT drops to 100mV below its nominal value, measured with VIN starting 2V above VOUT. Note 5: Use at least 1µF minimum for light loads. Add 0.125µF/mA (0.2µF/mA for the MAX1616) for loads greater than 100µA, not production tested. See Capacitor Selection in the Applications Information section. __________________________________________Typical Operating Characteristics (VOUT set to 5V, TA = +25°C, unless otherwise noted.) SAFE LOAD-CURRENT OPERATING AREA vs. SUPPLY VOLTAGE GROUND CURRENT vs. SUPPLY VOLTAGE AT VARIOUS LOADS 40 30 20 POWERDISSIPATION LIMIT REGION 10 6 65mA 5 55mA 4 45mA 3 35mA 2 25mA 1 0 5 10 15 20 SUPPLY VOLTAGE (V) 25 30 MAX1615-03 8.0 7.5 7.0 6.5 TA = +85°C 6.0 5mA TA = +25°C 5.5 15mA TA = -40°C 5.0 0 0 8.5 SUPPLY CURRENT (µA) 7 GROUND CURRENT (mA) 50 9.0 MAX1615-02 VOUT = 5V OUTPUT CURRENT (mA) 8 MAX1615-01 60 SUPPLY CURRENT vs. SUPPLY VOLTAGE 5 10 15 20 SUPPLY VOLTAGE (V) 25 30 5 10 15 20 25 30 SUPPLY VOLTAGE (V) _______________________________________________________________________________________ 3 MAX1615/MAX1616 ELECTRICAL CHARACTERISTICS (continued) ____________________________Typical Operating Characteristics (continued) (VOUT set to 5V, TA = +25°C, unless otherwise noted.) SHUTDOWN SUPPLY CURRENT vs. SUPPLY VOLTAGE RIPPLE REJECTION vs. FREQUENCY 1.4 MAX1615-05 -70 MAX1615-04 -60 1.2 RIPPLE REJECTION (dB) SHUTDOWN SUPPLY CURRENT (µA) 1.6 1.0 0.8 0.6 0.4 -50 -40 -30 -20 0.2 -10 0 0 ILOAD = 10mA 4 8 12 16 20 24 28 0.01 0.1 SUPPLY VOLTAGE (V) 1 100 10 FREQUENCY (kHz) LINE-TRANSIENT RESPONSE TIME TO EXIT SHUTDOWN LOAD-TRANSIENT RESPONSE MAX1615-07 MAX1615-06 +5V SHDN 0V MAX1615-08 +20V CIN 10µF VIN +10V VOUT 50mV/div +5V OUT COUT 4.7µF VOUT 50mV/div IOUT 30mA/div 0V VIN = 10V 50µs/div 500µs/div 100µs/div DROPOUT VOLTAGE vs. LOAD CURRENT DROPOUT SUPPLY CURRENT vs. SUPPLY VOLTAGE TA = +85°C MAX1615-10 80 0.30 MAX1615-09 90 0.25 70 60 TA = +25°C 50 TA = 0°C VIN - VOUT (V) DROPOUT SUPPLY CURRENT (µA) MAX1615/MAX1616 High-Voltage, Low-Power Linear Regulators for Notebook Computers 40 30 TA = -40°C 0.20 0.15 0.10 20 0.05 10 0 0 4.0 4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 5.8 6.0 SUPPLY VOLTAGE (V) 4 0 5 10 15 20 25 30 LOAD CURRENT (mA) _______________________________________________________________________________________ 35 40 High-Voltage, Low-Power Linear Regulators for Notebook Computers PIN NAME FUNCTION MAX1615 MAX1616 1 1 IN 2 2 GND Ground 3 3 OUT Regulator Output 4 — 5/3 Preset Output Voltage Select. Connect to GND for 3.3V output or to OUT for 5.0V output. — 4 FB Feedback Input. Regulates to 1.24V nominally. 5 5 SHDN Positive Input Voltage. Connect to a +4V to +28V supply. Shutdown, active low input. Connect to IN for automatic start up. IN VREF OUT CURRENT LIMIT SHDN The MAX1615’s output voltage is fed back through an internal resistor voltage divider connected to OUT. Set the output voltage to either 3.3V or 5.0V with the 5/3 pin. Select the 5V output by connecting 5/3 to OUT, or the 3.3V output by connecting 5/3 to GND. The MAX1616 uses external feedback, allowing the output voltage to be set by external resistors (see Setting the MAX1616 Output Voltage section). The typical FB threshold is at 1.24V. Shutdown MAX1615 MAX1616 The device enters shutdown mode when SHDN is low. In shutdown mode, the pass transistor, control circuit, reference, and all biases turn off, reducing the supply current to below 1µA. Connect SHDN to IN for automatic start-up. Current Limit FB 5/3 (MAX1616) (MAX1615) GND Figure 1. Functional Diagram _______________Detailed Description The MAX1615/MAX1616 low-quiescent-current linear regulators are designed primarily for high input voltage applications. The MAX1615 supplies a preselected 3.3V or 5.0V output for loads up to 30mA. The MAX1616 provides an adjustable voltage from 1.24V to 28V. The maximum output current is a function of the package’s maximum power dissipation for a given temperature. A 5µA load is required to maintain output regulation. Output current is limited to 100mA (typical). The current limit exceeds the 30mA (max) safe operating limit. The output can be shorted to ground for 30 seconds without damaging the part. Thermal-Overload Protection When the junction temperature exceeds TJ = +150°C, the thermal sensor sends a signal to the shutdown logic, turning off the pass transistor and allowing the IC to cool. The thermal sensor turns the pass transistor on again after the IC’s junction temperature cools by +20°C (typical), resulting in a pulsating output during continuous thermal-overload conditions. Operating Region and Power Dissipation Maximum power dissipation depends on the thermal resistance of the case and circuit board, the temperature difference between the die junction and ambient air, and the rate of air flow. The device’s power dissipa- _______________________________________________________________________________________ 5 MAX1615/MAX1616 ______________________________________________________________Pin Description MAX1615/MAX1616 High-Voltage, Low-Power Linear Regulators for Notebook Computers tion is P = IOUT (VIN - VOUT). The power dissipation at +70°C ambient is 571mW (see Absolute Maximum Ratings). The thermal resistance junction-to-case of the SOT23-5 package is 81°C/W, and the maximum safe junction temperature is +150°C. The GND pin performs the dual function of providing an electrical connection to ground and channeling heat away. Connect GND to ground using a large pad or ground plane. OUTPUT VOLTAGE OUT IN R1 MAX1616 6V TO 28V FB 0.1µF 6.8µF* SHDN R2 GND __________Applications Information Setting the MAX1616 Output Voltage Set the MAX1616’s output voltage with two resistors, R1 and R2 (Figure 2). Choose R2 = 250kΩ to maintain a 5µA minimum load and calculate R1 using the following equation: V R1 = R2 OUT − 1 V FBT *15µF for VOUT <3.3V Figure 2. MAX1616 Typical Application Circuit Table 1. Surface-Mount Capacitor Manufacturers where VFBT = 1.24V (typical). Capacitor Selection TYPE Use a 0.1µF minimum capacitor on the input. Higher values will improve line-transient response. Use 1µF minimum on the output, or 4.7µF for the full 30mA load current (6.8µF, MAX1616). Otherwise, use 1µF plus 0.125µF/mA (0.2µF/µA, MAX1616). For output voltages less than 3.3V, use 15µF instead of 6.8µF. The output capacitor’s effective series resistance (ESR) must be less than 1Ω for stable operation. Electrolytic MANUFACTURER CAPACITOR AVX TPS series Matsuo 267 series Sprague 593D, 595 series AVX X7R Matsuo X7R Ceramic Output Voltage Noise The MAX1615/MAX1616 typically exhibit 5mVp-p of noise during normal operation. This is negligible in most applications. In applications that include analogto-digital converters (ADCs) of more than 12 bits, consider the ADC’s power-supply-rejection specifications. Transient Response The Typical Operating Characteristics show the MAX1615/MAX1616’s load-transient response. Two of the output response’s components can be observed on the load-transient graph: a DC shift from the output impedance due to the different load currents, and the transient response. Typical step changes in the load current from 10mA to 20mA produce 50mV transients. Increasing the output capacitor’s value attenuates transient spikes. 6 Table 2. Component Suppliers SUPPLIER PHONE FAX AVX (803) 946-0690 (803) 626-3123 Matsuo (714) 969-2491 (714) 960-6492 Sprague (603) 224-1961 (603) 224-1430 ___________________Chip Information TRANSISTOR COUNT: 386 _______________________________________________________________________________________ High-Voltage, Low-Power Linear Regulators for Notebook Computers D P0 W P2 B0 t D1 F P NOTE: DIMENSIONS ARE IN MM. AND FOLLOW EIA481-1 STANDARD. K0 A0 A0 3.200 ±0.102 E 1.753 ±0.102 P0 B0 3.099 ±0.102 F 3.505 ±0.051 P010 D 1.499 +0.102 +0.000 K0 1.397 ±0.102 3.988 ±0.102 0.991 +0.254 +0.000 P D1 3.988 ±0.102 40.005 ±0.203 P2 2.007 ±0.051 t 0.254 ±0.127 W 8.001 +0.305 -0.102 5 SOT23-5 E _______________________________________________________________________________________ 7 MAX1615/MAX1616 __________________________________________________Tape-and-Reel Information ________________________________________________________Package Information SOT5L.EPS MAX1615/MAX1616 High-Voltage, Low-Power Linear Regulators for Notebook Computers Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.