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TPS81256SIPR Datasheet(PDF) 5 Page - Texas Instruments |
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TPS81256SIPR Datasheet(HTML) 5 Page - Texas Instruments |
5 / 27 page 5 TPS81256 www.ti.com SLVSAZ9C – JUNE 2012 – REVISED FEBRUARY 2016 Product Folder Links: TPS81256 Submit Documentation Feedback Copyright © 2012–2016, Texas Instruments Incorporated (1) Thermal data have been simulated with high-K board (per JEDEC standard). 7.4 Thermal Information THERMAL METRIC(1) TPS81256 UNIT µSIP (SIP) – 9 PINS RθJA Junction-to-ambient thermal resistance 62 °C/W ψJB Junction-to-board characterization parameter 31 ψJT Junction-to-case (top) thermal resistance – (1) Maximum values can vary over lifetime due to intrinsic capacitor ageing effects. For more details, refer to Thermal and Reliability Information section. 7.5 Electrical Characteristics Minimum and maximum values are at VIN = 2.5V to 5.5V, VOUT = 5.0V (or VIN, whichever is higher), EN = 1.8V, TA = –40°C to 85°C; Circuit of Parameter Measurement Information section (unless otherwise noted). Typical values are at VIN = 3.6V, VOUT = 5.0V, EN = 1.8V, TA = 25°C (unless otherwise noted). PARAMETER TEST CONDITIONS MIN TYP MAX UNIT SUPPLY CURRENT IQ Operating quiescent current into VIN (1) IOUT = 0mA, VOUT = 5.0V, VIN = 3.6V EN = VIN Device not switching 30 50 µA Operating quiescent current into VOUT (1) 7 20 µA ISD Shutdown current(1) EN = GND 0.85 5.0 μA VUVLO Under-voltage lockout threshold Falling 2.0 2.1 V Hysteresis 0.1 V ENABLE VIL Low-level input voltage 0.4 V VIH High-level input voltage 1.0 V Ilkg Input leakage current Input connected to GND or VIN 0.5 µA OUTPUT VOUT Regulated DC output voltage 2.5V ≤ VIN ≤ 4.85V, IOUT = 0mA PWM operation. Open Loop 4.92 5 5.08 V 3.3V ≤ VIN ≤ 4.85V, 0mA ≤ IOUT ≤ 550mA PFM/PWM operation 4.85 5 5.2 V 2.9V ≤ VIN ≤ 4.85V, 0mA ≤ IOUT ≤ 450mA PFM/PWM operation 4.85 5 5.2 V ΔVOUT Power-save mode output ripple voltage PFM operation, IOUT = 1mA 35 mVpk PWM mode output ripple voltage PWM operation, IOUT = 200mA 8 mVpk POWER SWITCH rDS(on) Input-to-output On-resistance VI = 5.25 V. Device not switching 320 m Ω Ilkg Reverse leakage current into VOUT(1) EN = GND 5 µA ILIM Average input current limit EN = VIN. VIN = 3.3V 1180 mA Overtemperature protection 140 °C Overtemperature hysteresis 20 °C OSCILLATOR fOSC Oscillator frequency VIN = 3.6V, VOUT = 5.0V, IOUT = 500mA 4 MHz TIMING Start-up time IOUT = 0mA Time from active EN to start switching 70 µs IOUT = 0mA Time from active EN to VOUT 400 µs 7.6 Typical Characteristics Table 1. Table of Graphs FIGURE η Efficiency vs Output current Figure 1, Figure 3 vs Input voltage Figure 2 |
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