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MAX1615EUK-T Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX1615EUK-T Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 8 page High-Voltage, Low-Power Linear Regulators for Notebook Computers 6 _______________________________________________________________________________________ ___________________Chip Information TRANSISTOR COUNT: 386 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. __________Applications Information Setting the MAX1616 Output Voltage Set the MAX1616’s output voltage with two resistors, R1 and R2 (Figure 2). Choose R2 = 250k Ω to maintain a 5µA minimum load and calculate R1 using the following equation: where VFBT = 1.24V (typical). Capacitor Selection 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 1 Ω for stable operation. 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 analog- to-digital converters (ADCs) of more than 12 bits, con- sider 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 tran- sient spikes. R1 = R2 V V OUT FBT − 1 Table 1. Surface-Mount Capacitor Manufacturers MANUFACTURER CAPACITOR Sprague 593D, 595 series Electrolytic AVX TPS series TYPE Matsuo 267 series Ceramic AVX X7R Matsuo X7R Table 2. Component Suppliers PHONE FAX (803) 626-3123 (714) 960-6492 (603) 224-1430 AVX (803) 946-0690 Sprague SUPPLIER Matsuo (714) 969-2491 (603) 224-1961 IN OUT FB SHDN GND 6V TO 28V 0.1 µF 6.8 µF* R1 R2 OUTPUT VOLTAGE MAX1616 *15 µF for VOUT <3.3V Figure 2. MAX1616 Typical Application Circuit |
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