NCP1117I

Part: NCP1117 series Type: Low-Dropout Positive Fixed and Adjustable Voltage Regulators

Description: The NCP1117 series are low dropout positive voltage regulators capable of providing over 1.0 A output current with a maximum dropout voltage of 1.2 V at 800 mA, offering fixed output voltages from 1.5 V to 12 V or an adjustable output from 1.25 V to 18.8 V.

Operating Conditions:

• Supply voltage: Up to 20 V
• Operating ambient temperature: 0 to +125 °C (NCP1117), -40 to +125 °C (NCP1117I, NCV1117)
• Output current: In excess of 1.0 A

Absolute Maximum Ratings:

• Max supply voltage: 20 V
• Max junction temperature: 150 °C
• Max storage temperature: 150 °C

Key Specs:

• Dropout Voltage: 1.2 V max (at 800 mA)
• Output Current Limit: 1000 mA min (V_in - V_out = 5.0 V, T_A = 25 °C)
• Reference Voltage (Adjustable): 1.225 V min, 1.270 V max (V_in - V_out = 1.4 V to 10 V, I_out = 10 mA to 800 mA)
• Output Voltage Accuracy: ±1.0% (trimmed)
• Quiescent Current: 3.6 mA typ (1.5 V version, V_in = 11.5 V) to 6.0 mA typ (12 V version, V_in = 20 V)
• Ripple Rejection: 67 dB min (Adjustable, V_in - V_out = 6.4 V, I_out = 500 mA, 10 Vpp 120 Hz Sinewave)
• Thermal Regulation: 0.01 %/W typ (T_A = 25 °C, 30 ms Pulse)
• RMS Output Noise (f = 10 Hz to 10 kHz): 0.003 %V_out typ

Features:

• 1.2 V Maximum Dropout Voltage at 800 mA Over Temperature
• Output Current in Excess of 1.0 A
• Fixed Output Voltages of 1.5 V, 1.8 V, 1.9 V, 2.0 V, 2.5 V, 2.85 V, 3.3 V, 5.0 V, and 12 V
• No Minimum Load Requirement for Fixed Voltage Output Devices
• Adjustable Output Voltage Option
• Reference/Output Voltage Trimmed to ±1.0%
• Operation to 20 V Input
• Current Limit, Safe Operating and Thermal Shutdown Protection
• NCV Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements; AEC-Q100 Qualified and PPAP Capable
• Pb-Free Devices

Applications:

• Active SCSI Termination for 2.85 V Version
• Consumer and Industrial Equipment Point of Regulation
• Switching Power Supply Post Regulation
• Battery Chargers
• Hard Drive Controllers

Package:

• SOT-223
• DPAK

• 1.2 V Maximum Dropout Voltage at 800 mA Over Temperature
• Output Current in Excess of 1.0 A
• Fixed Output Voltages of 1.5 V, 1.8 V, 1.9 V, 2.0 V , 2.5 V , 2.85 V , 3.3 V, 5.0 V , and 12 V
• No Minimum Load Requirement for Fixed Voltage Output Devices
• Adjustable Output Voltage Option
• Reference/Output Voltage Trimmed to ± 1.0%
• Operation to 20 V Input
• Current Limit, Safe Operating and Thermal Shutdown Protection
• NCV Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements; AEC -Q100 Qualified and PPAP Capable
• These are Pb-Free Devices

• Active SCSI Termination for 2.85 V Version
• Consumer and Industrial Equipment Point of Regulation
• Switching Power Supply Post Regulation
• Battery Chargers
• Hard Drive Controllers

SOT -223 ST SUFFIX CASE 318H

DPAK DT SUFFIX CASE 369C

SOT -223 (Top View)

Pin:

1. Adjust/Ground

2. Output

3. Input

Heatsink tab is connected to Pin 2.

(C in = 10 m F, C out = 10 m F, for typical value T A = 25 ° C, for min and max values T A is the operating ambient temperature range that applies unless otherwise noted.) (Note 4)

Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected.

1. This device series contains ESD protection and exceeds the following tests: Human Body Model (HBM), Class 2, 2000 V Machine Model (MM), Class B, 200 V Charge Device Model (CDM), Class IV, 2000 V.

1. Internal thermal shutdown protection limits the die temperature to approximately 175 ° C. Proper heatsinking is required to prevent activation. The maximum package power dissipation is:
2. The regulator output current must not exceed 1.0 A with V in greater than 12 V.

This series contains an internal thermal limiting circuit that is designed to protect the regulator in the event that the maximum junction temperature is exceeded. When activated, typically at 175 ° C, the regulator output switches off and then back on as the die cools. As a result, if the device is continuously operated in an overheated condition, the output will appear to be oscillating. This feature provides protection from a catastrophic device failure due to accidental overheating. It is not intended to be used as a substitute for proper heatsinking. The maximum device power dissipation can be calculated by:

The devices are available in surface mount SOT -223 and DPAK packages. Each package has an exposed metal tab that is specifically designed to reduce the junction to air thermal resistance, R q JA, by utilizing the printed circuit board copper as a heat dissipater. Figures 21 and 22 show typical R q JA values that can be obtained from a square pattern using economical single sided 2.0 ounce copper board material. The final product thermal limits should be tested and quantified in order to insure acceptable performance and reliability. The actual R q JA can vary considerably from the graphs shown. This will be due to any changes made in the copper aspect ratio of the final layout, adjacent heat sources, and air flow.

Figure 27. Constant Current Regulator

Figure 27. Constant Current Regulator

Figure 29. Regulator with Shutdown

The 50 W resistor that is in series with the ground pin of the upper regulator level shifts its output 300 mV higher than the lower regulator. This keeps the lower regulator off until the input source is removed.

Figure 31. Battery Backed -Up Power Supply

Figure 28. Slow Turn -On Regulator

Resistor R2 sets the maximum output voltage. Each transistor reduces the output voltage when turned on.

Figure 30. Digitally Controlled Regulator

Figure 28. Slow Turn -On Regulator

Figure 32. Adjusting Output of Fixed Voltage Regulators

Figure 2. Adjustable Output Regulator

Figure 3. Active SCSI Bus Terminator