SLM2169

The SLM2169 is a CMOS step-up switching regulator controller which mainly consists of a reference voltage source, an oscillation circuit, an error amplifier, a phase compensation circuit, and a PWM / PFM switching control circuit. With an external low-ON-resistance N-channel Power MOS, this product is ideal for applications requiring high efficiency and a high output current. The SLM2169 efficiently works on voltage’s condition of large I/O difference due to the PWM control circuit linearly varies the duty ratio to 90%. During light-load, the SLM2169 switches its operation to the PFM control by the PWM / PFM switching control circuit in order to prevent efficiency decline due to the IC operating current. Ceramic capacitors can be used for output capacitor. Small package SOT-23-5 enables high-density mounting.

Applications

• MP3 players, digital audio players, mobile power pack
• Digital cameras, GPS, wireless transceiver
• Portable devices

Key features

• Input voltage range 1.8 V ~ 5.5 V
• Oscillation frequency 1.2MHz
• Reference voltage 0.6 V ±2.0%
• Soft start function 10ms typ
• Low current consumption 50 μA typ at switching off
• Duty ratio Built-in PWM / PFM switching control circuit 20% ~ 90%
• Shut-down function Current consumption 1.0 μA max at shutdown
• External component Inductor, diode, capacitor, transistor
• UVLO function 1.7V typ