ISL9011 is a high performance dual LDO from Infineon. It has a low standby current and high-PSRR and is stable with output capacitance of 1µF to 10µF with ESR of up to 200mΩ. A reference bypass pin allows an external capacitor for adjusting a noise filter for low noise and high PSRR applications. The quiescent current is typically only 45µA with both LDO’s enabled and active. Separate enable pins control each individual LDO output. When both enable pins are low, the device is in shutdown, typically drawing less than 0.1µA.
The ISL9011 integrates two low‑noise LDO regulators in a compact 10‑lead DFN package. Each channel can be enabled independently, provides up to 150 mA (VO1) or 300 mA (VO2), and features a low dropout voltage of about 120 mV at 150 mA.
Typical applications include portable instruments, smartphones, MP3 players, and medical handheld devices where low standby current (≈45 µA) and high PSRR (70 dB @ 1 kHz) are critical. The device includes soft‑start, over‑current, and over‑temperature protection.
| VO1 Output Current | 150 mA |
|---|---|
| VO2 Output Current | 300 mA |
| Quiescent Current (both LDOs active) | 45 µA |
| Dropout Voltage (VO1 @ 150 mA) | ≈120 mV |
| Power Supply Rejection Ratio | 70 dB @ 1 kHz |
| Input Voltage Range | 2.3 V to 6.5 V |
| Operating Temperature Range | -40 °C to +85 °C |
| Package | 10‑lead DFN 3 mm × 3 mm |
The device draws only about 45 µA of quiescent current with both LDOs enabled.
VO1 has priority and is always powered up before VO2 when EN1 and EN2 go high at the same time.
If EN2 goes high first, VO1 turns on first and the device delays VO2 until VO1 reaches its target voltage.