Datasheet LT3041 (Analog Devices) - 5

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LT3041 SPECIFICATIONS Table 1. Electrical Characteristics Parameter Test Conditions/Comments Min Typ Max Unit
THERMAL SHUTDOWN TJ rising 169 °C Hysteresis 5 °C START-UP TIME VOUT (NOM) = 5 V, IL = 1 A, CSET = 0.47 µF, VIN = 6 V, 55 ms VPGFB = 6 V VOUT (NOM) = 5 V, IL = 1 A, CSET = 4.7 µF, VIN = 6 V, 550 ms VPGFB = 6 V VOUT (NOM) = 5 V, IL = 1 A, CSET = 4.7 µF, VIN = 6 V, 10 ms Power-Good 1 resistance (RPG1) = 50 kΩ, Power-Good 2 resistance (RPG2) = 700 kΩ (with fast startup to 90% of VOUT) THERMAL REGULATION 10 ms pulse –0.01 %/W DIFFERENTIAL VIOC10 VIOC amplifier gain 1 V/V VIOC pin voltage range: VOUT > VIOC voltage (VVIOC) + 1 4 V 0.6 V VIOC pin voltage: VOUT ≤ 1.5 V, VIN = 2.5 V 1 V VIOC pin source current 300 µA VIOC pin sink current: VIN ≥ 2.5 V 2 µA 1 The EN/UV pin threshold must be met to ensure device operation. 2 The maximum TJ limits operating conditions. The regulated output-voltage specification does not apply for all possible combinations of input voltage and output current, especially due to the internal current-limit foldback, which starts to decrease current limit at VIN – VOUT > 11 V. If operating at the maximum output current, limit the input-voltage range. If operating at the maximum input voltage, limit the output-current range. 3 OUTS ties directly to OUT. 4 Changes in ISET and VOS with VSET are tested at 0.2V, 0.75V, 1.3V, and 15V to insure operation over the 0.2V to 15V SET pin voltage range. 5 The dropout voltage is the minimum input-to-output differential voltage needed to maintain regulation at a specified output current. The dropout voltage is measured when output is 1% out of regulation. This definition results in a higher dropout voltage compared to hard dropout, which is measured when VIN = VOUT (NOMINAL). For output voltages less than 1.7 V, the dropout voltage is limited by the minimum input-voltage specification. See Figure 18 for the dropout voltage as a function of the output current and for temperature see Figure 19, which was measured in a typical application circuit. 6 The GND pin current is tested with VIN = VOUT (NOMINAL) and a current source load. Therefore, the LT3041 is tested while operating in dropout, which is the worst-case GND pin current. The GND pin current decreases at higher input voltages. Note that the GND pin current does not include the SET pin or the ILIM pin current; however, quiescent current does include the SET and ILIM pins. 7 Adding a capacitor across the SET pin resistor decreases the output voltage noise. Adding this capacitor bypasses the thermal noise of the resistor on the SET pin as well as the noise of the reference current. The output noise then equals the error-amplifier noise. Use of a SET pin bypass capacitor also increases the start-up time. 8 The internal back-up current-limit circuitry incorporates foldback protection that decreases current limit for VIN – VOUT > 11 V. Some level of output current is provided at all VIN – VOUT differential voltages. See Figure 32 for the current limit as a function of VIN – VOUT. 9 The current-limit programming scale factor is specified while the internal backup current limit is not active. Note that the internal current limit has foldback protection for VIN – VOUT differentials greater than 11 V. 10 The VIOC buffer outputs a voltage equal to VIN – VOUT or VIN – 1.5 V for VOUT ≤ 1.5 V. See Figure 70 and the High-Efficiency Linear Regulator: Voltage Input-to-Output Control (VIOC) section for further information. Set the source current of the VIOC pin between 10 µA and 300 µA.
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Document Outline Features Applications Typical Application General Description Specifications Electrical Characteristics Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Applications Information Output Voltage Output Sensing and Stability Stability and Output Capacitance High Vibration Environments Stability and Input Capacitance PSRR and Input Capacitance Filtering High-Frequency Spikes Output Noise SET Pin (Bypass) Capacitance: Noise, PSRR, Transient Response, and Soft-Start Fast Startup EN/UV Programmable Power Good Externally Programmable Current Limit Output Overshoot Recovery Direct Paralleling for Higher Current PCB Layout Considerations High-Efficiency Linear Regulator: Voltage Input-to-Output Control (VIOC) Typical VIOC Application Thermal Considerations Calculating Junction Temperature Overload Recovery Protection Features Typical Applications Related Products Outline Dimensions Ordering Guide Evaluation Boards