LD39100PUR

Part: LD39100 (LD39100PURY) — STMicroelectronics

Type: Low-Dropout (LDO) Linear Voltage Regulator, automotive grade

Description: 1.5–5.5 V input, 1 A low-noise LDO regulator with 200 mV typical dropout at 1 A, 20 μA typical quiescent current at no load, and fixed or adjustable (0.8 V reference) output.

Operating Conditions:

• Supply voltage: 1.5–5.5 V
• Operating junction temperature: -40 to 125 °C
• Output voltage: 0.8 V to 4.5 V (fixed in 100 mV steps on request) or adjustable from 0.8 V
• Minimum output capacitor: 1 μF (ceramic, ESR 0 to 150 mΩ)

Absolute Maximum Ratings:

• Max input voltage (VIN): 7 V
• Max output voltage (VOUT): VIN + 0.3 V (7 V max.)
• Max EN / PG pin voltage: 7 V
• Max ADJ pin voltage: 4 V
• Output current: internally limited
• Storage temperature: -65 to 150 °C
• Operating junction temperature: -40 to 125 °C
• ESD: 4 kV HBM, 0.4 kV MM

Key Specs:

• Dropout voltage: 200 mV typ., 400 mV max (IOUT = 1 A, VOUT > 1.5 V, -40 °C < TJ < 125 °C)
• Quiescent current: 20 μA typ. at IOUT = 0 mA; 200 μA typ. at 1 A; 300 μA max for 0 to 1 A over temperature
• Off-mode current: 0.001 μA typ., 1 μA max (VEN = GND)
• VADJ accuracy: 800 mV typ., ±2% at 25 °C (784–816 mV); 776–824 mV over -40 to 125 °C
• Fixed-version VOUT accuracy: ±2% at 25 °C, ±3% over -40 to 125 °C (VOUT > 1.5 V, IOUT = 10 mA)
• Output noise: 30 μVRMS (VOUT = 0.8 V, adjustable version); 85 μVRMS (VOUT = 2.5 V, 10 Hz–100 kHz, fixed version)
• PSRR: 70 dB at 1 kHz (adjustable, IOUT = 10 mA); 65 dB (fixed, 1 kHz)
• Short-circuit current: 2.5 A typ.
• Enable thresholds: 0.4 V max low, 0.9 V min high
• Power good: rising 0.92×VOUT, falling 0.8×VOUT, open-drain, 0.4 V max at 6 mA sink
• Turn-on time: 30 μs typ.
• Thermal shutdown: 160 °C, hysteresis 20 °C
• Thermal resistance: RthJA 55 °C/W, RthJC 10 °C/W

Features:

• AEC-Q100 qualified
• Ultra-low dropout voltage
• Very low quiescent current
• Very low noise with no bypass capacitor
• 1 A guaranteed output current
• Logic-controlled electronic shutdown
• Power Good output
• Stable with 1 μF ceramic output capacitor
• Internal current limit and thermal protection

Applications:

• Printers
• Game consoles
• Computers
• Consumer applications
• Automotive post regulation

Package:

• DFN6 (3x3 mm) with wettable flank

• AEC-Q100 qualified
• Input voltage from 1.5 to 5.5 V
• Ultra-low dropout voltage (200 mV typ. at 1 A load)
• Very low quiescent current (20 μA typ. at no load, 200 μA typ. at 1 A load, 1 μA max. in off mode)
• Very low-noise with no bypass capacitor (30 μ V RMS at V OUT = 0.8 V)
• Output voltage tolerance: ±2.0% at 25 °C
• 1 A guaranteed output current
• Wide range of output voltages available on request: 0.8 V to 4.5 V with 100 mV step and adjustable from 0.8
• Logic-controlled electronic shutdown
• Stable with ceramic capacitors C OUT = 1 μF
• Internal current and thermal limit
• DFN6 (3x3 mm) package
• Temperature range: -40 °C to 125 °C

• Printers
• Game consoles
• Computer
• Consumer applications
• Automotive post regulation

Figure 3. Pin connection (top view)

Table 1. Pin description

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Table 1. Pin description

Table 5. LD39100 electrical characteristics (adjustable version) T J = 25 °C, V IN = 1.8 V, C IN = C OUT = 1 μF, IOUT = 100 mA, VEN = VIN, unless otherwise specified

Table 5. LD39100 electrical characteristics (adjustable version) T J = 25 °C, V IN = 1.8 V, C IN = C OUT = 1 μF, IOUT = 100 mA, VEN = VIN, unless otherwise specified

1. All transient values are guaranteed by design, not tested in production.

2. Dropout voltage is the input-to-output voltage difference at which the output voltage is 100 mV below its nominal value. This specification does not apply to output voltages below 1.5 V.

3. PG pin floating.

4. Turn-on time is time measured between the enable input just exceeding V EN high value and the output voltage just reaching 95% of its nominal value.

Table 6. LD39100 electrical characteristics (fixed version) T J = 25 °C, V IN = V OUT(NOM) + 1 V, C IN = C OUT = 1 μF, I OUT = 100 mA, V EN = V IN , unless otherwise specified

Table 6. LD39100 electrical characteristics (fixed version) T J = 25 °C, V IN = V OUT(NOM) + 1 V, C IN = C OUT = 1 μF, I OUT = 100 mA, V EN = V IN , unless otherwise specified

1. All transient values are guaranteed by design, not tested in production.

2. Dropout voltage is the input-to-output voltage difference at which the output voltage is 100 mV below its nominal value. This specification does not apply to output voltages below 1.5 V.

3. PG pin floating.

4. Turn-on time is time measured between the enable input just exceeding V EN high value and the output voltage just reaching 95% of its nominal value.

Table 2. Absolute maximum ratings

Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied. All values are referred to GND.

Table 3. Thermal data

Table 4. ESD performance

Table 4. ESD performance

The LD39100 is an ultra low-dropout linear regulator. It provides up to 1 A with a low 200 mV dropout. The input voltage range is from 1.5 V to 5.5 V. The device is available in fixed and adjustable output versions.

The regulator is equipped with internal protection circuitry, such as short-circuit current limiting and thermal protection.

Figure 30. Typical application circuit for fixed output version and Figure 31. Typical application circuit for adjustable version illustrate the typical application schematics:

Figure 30. Typical application circuit for fixed output version

Figure 30. Typical application circuit for fixed output version and Figure 31. Typical application circuit for adjustable version illustrate the typical application schematics:

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Figure 31. Typical application circuit for adjustable version

Figure 30. Typical application circuit for fixed output version

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Regarding the adjustable version, the output voltage can be adjusted from 0.8 V up to the input voltage, minus the voltage drop across the pass element (dropout voltage), by connecting a resistor divider between ADJ pin and the output, thus allowing remote voltage sensing.

The resistor divider should be selected as follows:

Resistors should be used with values in the range from 10 kΩ to 50 kΩ. Lower values can also be suitable, but they increase current consumption.

$$V_{OUT} = V_{ADJ}\left(1 + R_1 / R_2\right) \text{ with } V_{ADJ} = 0.8V(typ.)$$

In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product status are available at: www.st.com. ECOPACK is an ST trademark.