NCP1117

Part: NCP1117 series (NCP1117, NCP1117I, NCV1117) — ON Semiconductor

Type: Low-Dropout Positive Linear Voltage Regulator (fixed and adjustable)

Description: 20 V input, >1.0 A low-dropout positive regulator with 1.2 V max dropout at 800 mA, ±1.0% trimmed reference/output, nine fixed output voltages (1.5–12 V) plus an adjustable version (1.25–18.8 V).

Operating Conditions:

• Input voltage: up to 20 V
• Operating ambient temperature: 0 to +125 °C (NCP1117); -40 to +125 °C (NCP1117I, NCV1117)
• Output voltage: 1.5, 1.8, 1.9, 2.0, 2.5, 2.85, 3.3, 5.0, 12 V fixed; adjustable 1.25 V to 18.8 V
• Output current must not exceed 1.0 A with Vin greater than 12 V

Absolute Maximum Ratings:

• Max input voltage: 20 V
• Max die junction temperature range: -55 to 150 °C
• Storage temperature range: -65 to 150 °C
• Output short circuit duration: infinite
• Power dissipation: internally limited

Key Specs:

• Reference voltage (adjustable): 1.238–1.262 V at 25 °C (Vin-Vout = 2.0 V, Iout = 10 mA); 1.225–1.270 V over line/load/temperature
• Dropout voltage: 1.10 V typ / 1.20 V max at Iout = 800 mA (typ 0.95 V at 100 mA, 1.01 V at 500 mA)
• Output current limit: 1000 mA min, 1500 mA typ, 2200 mA max (Vin-Vout = 5 V, TA = 25 °C)
• Quiescent current (fixed): 3.6–6.0 mA typ, 10 mA max
• Ripple rejection: 60–73 dB typ for most versions (Vin-Vout = 6.4 V, Iout = 500 mA, 120 Hz); 12 V version 54 dB typ
• Minimum load current (adjustable): 0.8 mA typ, 5.0 mA max
• Adjust pin current: 52 μA typ, 120 μA max
• Thermal regulation: 0.01 %/W typ, 0.1 %/W max; RMS output noise 0.003 %Vout typ (10 Hz–10 kHz)

Features:

• 1.2 V maximum dropout at 800 mA over temperature
• Output current in excess of 1.0 A
• No minimum load requirement for fixed-voltage devices
• Reference/output voltage trimmed to ±1.0%
• Current limit, safe operating area and thermal shutdown protection (thermal shutdown at approx. 175 °C)
• NCV prefix: AEC-Q100 qualified and PPAP capable
• Pb-free devices
• Pin compatible with LM317

Applications:

• Active SCSI termination (2.85 V version)
• Consumer and industrial equipment point of regulation
• Switching power supply post regulation
• Battery chargers
• Hard drive controllers

Package:

• SOT-223 (ST suffix, case 318H); RθJA 160 °C/W, RθJC 15 °C/W
• DPAK (DT suffix, case 369C); RθJA 67 °C/W, RθJC 6.0 °C/W

• 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.

$$P_D = \frac{T_{J(max)} - T_A}{R_{\theta JA}}$$

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:

$$P_D = \frac{T_{J(max)} - T_A}{R_{\theta JA}}$$

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 28. Slow Turn -On Regulator

Figure 29. Regulator with Shutdown

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

Figure 30. Digitally Controlled 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 30. Digitally Controlled Regulator

Figure 32. Adjusting Output of Fixed Voltage Regulators

Figure 2. Adjustable Output Regulator

Figure 3. Active SCSI Bus Terminator