LP3927  Product Folder

The LP3927 system power management IC is designed for cellular/PCS handsets as well as other portable systems that require intelligent power management. Each device contains five low-dropout linear regulators (LDO's), a reset timer, a power-up control logic, a general-purpose open drain output that can be used to light LEDs, and a CMOS rail-to-rail input/output operational amplifier.

Each linear regulator features an extremely low dropout voltage of 100 mV (typ) at maximum output current. LDO1 and LDO2 are powered on and off by either the KYBD or the VEXT# pin. LDO3, LDO4 and LDO5 each have its independent enable pin. LDO1 and LDO4 are rated at 150 mA each, LDO2 and LDO5 are rated at 200 mA each and LDO3 is rated at 100 mA. All LDO's are optimized for low noise and high isolation.

The open drain output current sink can be programmed up to 150 mA by using an external low cost resistor.

A single supply, low voltage operational amplifier has rail to rail input and output with 600 kHz of gain-bandwidth product.

• 3.0V to 5.5V Input Voltage Range
• Two 200 mA, Two 150 mA and One 100 mA LDO's
• 100 mV typ Dropout Voltage @ I_MAX
• 150 mA General-Purpose Open-drain programmable current sink for back light LED
• Low Voltage Rail to Rail Input/Output Operational Amplifier
• 28 pin LLP package

• Cellular/PCS handsets
• PDA's, Palmtops, and portable terminals
• Single-Cell Li+ Systems
• 2- or 3- Cell NiMH, NiCd or Alkaline System