ST730

Part: ST730 — STMicroelectronics

Type: Low-Dropout Voltage Regulator (LDO)

Description: 300 mA, 28 V low-dropout voltage regulator with ultra-low 5 μA quiescent current, available in fixed (1.2 V to 12 V) and adjustable (1.2 V to V_IN - V_DROP) output voltage versions.

Operating Conditions:

• Supply voltage: 2.5 V to 28 V
• Operating temperature: -40 °C to +125 °C
• Output current: up to 300 mA

Absolute Maximum Ratings:

• Max supply voltage: 30 V
• Max storage temperature: 150 °C
• Max operating junction temperature: 125 °C

Key Specs:

• Operating input voltage: 2.5 V to 28 V
• Quiescent current (no load): typ. 5 μA
• Output voltage accuracy: ±0.5% at 25 °C
• Dropout voltage (300 mA): typ. 600 mV (V_OUT = V_OUT(NOM) - 0.1 V, V_OUT(NOM) ≥ 2.5 V)
• Standby current (V_EN = GND): typ. 0.35 μA
• Thermal shutdown temperature: typ. 160 °C
• Short-circuit current (R_L = 0): typ. 450 mA

Features:

• Wide input voltage range: 2.5 V to 28 V
• Ultra-low quiescent current: typ. 5 μA at no-load
• High output voltage accuracy: ±0.5% @ 25 °C
• Output current up to 300 mA
• Fixed and adjustable output voltage versions
• Thermal shutdown protection, current limit and SOA protection

Applications:

• Post regulation
• Electronic meters
• Smoke detectors / alarms
• Portable equipment
• Industrial application

Package:

• SOT23-5L

• Wide input voltage range : 2.5 V to 28 V
• Ultra-low quiescent current: typ. 5 μA at no-load, 10 μA max. across full temperature range, 1 μA max. in shutdown
• High output voltage accuracy: ± 0.5% @ 25 °C, ± 1% across temperature range
• Output current up to 300 mA
• Fixed output voltage versions, starting from 1.2 V to 12 V with 100 mV step
• Adjustable voltage version, starting from 1.2 V to V IN - V DROP
• Stable with low ESR capacitors (0.47 μF min.)
• Thermal shutdown protection
• Current limit and SOA protection
• -40 °C to +125 °C operating temperature range

• Post regulation
• Electronic meters
• Smoke detectors / alarms
• Portable equipment
• Industrial application

Figure 3. Pin connection (top view)

Table 1. Pin description

Table 1. Pin description

TA = TJ = -40 °C to +125 °C, typical values refer to T A = +25 °C, V IN = V EN = V OUT + 1 V (1) , IOUT = 10 mA, CIN = 0.1 μF, C OUT = 0.47 μF, unless otherwise specified (see note).

Table 5. Electrical characteristics for ST730, Fixed version

Note:

Note:

Values in full temperature range are guaranteed by design and/or characterization tested at T A = ~ T J . Low duty cycle pulse techniques are used.

TA = TJ = -40 °C to +125 °C, typical values refer to T A = +25 °C, V IN = V EN = 2.5 V, I OUT = 10 mA, C IN = 0.1 μF, COUT = 0.47 μF, unless otherwise specified (see note).

Table 6. Electrical characteristics for ST730, Adjustable version

Values in full temperature range are guaranteed by design and/or characterization tested at T A = ~ T J . Low duty cycle pulse techniques are used.

Table 2. Absolute maximum ratings

Note: Absolute maximum ratings are thosevalues 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

Note: RthJA based on 4-layer (2S2P) JEDEC test board constructed based on JESD 51-7 specification.

Table 4. Electro static discharge

Table 4. Electro static discharge

An internal thermal feedback loop disables the output voltage if the die temperature reaches approximately 160 °C. This feature protects the device from excessive temperature that could lead to permanent damage to the LDO.

Once the thermal protection is triggered and the device is shut down, normal operation is automatically recovered if the die temperature falls below 140 °C (thermal protection hysteresis of 20 °C typically).

Continuous operation above the maximum ratings may lead to permanent damage to the device.

In case of operation with strongly inductive loads, undershoots on the output may happen. If those negative spikes overcome the absolute maximum ratings of the device, permanent damage may occur. A schottky diode connected in parallel to the output port reduces the risk of damages in such operating cases.

Figure 4. Typical application circuit, fixed version

Figure 5. Typical application circuit, adjustable version

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.