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General description

The PF1550 is a power management integrated circuit (PMIC) designed specifically for

use with i.MX processors on low-power portable, smart wearable and Internet-of-Things

(IoT) applications. It is also capable of providing full power solution to i.MX 7ULP, i.MX

6SL, 6UL, 6ULL, and 6SX processors.

With three high-efficiency buck converter, three linear regulators, RTC supply, and battery

linear charger, the PF1550 can provide power for a complete battery-powered system,

including application processors, memory, and system peripherals.

1.1 Features and benefits

This section summarizes the PF1550 features:

? Input voltage range to PMIC VBUSIN pin via USB bus or AC adapter: 4.1 V to 6.0 V

? Buck converters:

– SW1, 1.0 A; 0.6 V to 1.3875 V in 12.5 mV steps, or 1.1 V to 3.3 V in variable steps

– SW2, 1.0 A; 0.6 V to 1.3875 V in 12.5 mV steps, or 1.1 V to 3.3 V in variable steps

– SW3, 1.0 A; 1.8 V to 3.3 V in 100 mV steps

– Soft start

– Quiescent current 1.0 μA in ULP mode with light load

– Peak efficiency > 90

– Dynamic voltage scaling on SW1 and SW2

– Modes: forced PWM quasi-fixed frequency mode, adaptive variable-frequency mode

– Programmable output voltage, current limit, and soft start

? LDO regulators

– LDO1, 0.75 V to 1.5 V/1.8 to 3.3 V, 300 mA with load switch mode

– LDO2, 1.8 V to 3.3 V, 400 mA

– LDO3, 0.75 V to 1.5 V/1.8 V to 3.3 V, 300 mA with load switch mode

– Quiescent current < 1.5 μA in Low-power mode

– Programmable output voltage

– Soft start and ramp

– Current limit protection

? Battery charger

– Supports single-cell Lithium Ion/Lithium Polymer batteries

– Linear charging (10 mA to 1500 mA input limit)

– Up to 6.5 V input operating range

– VSYS regulator can withstand transient and DC inputs from 0 V up to +22 V

– Programmable charge voltage (3.5 V to 4.44 V)

– Programmable charge current (100 mA to 1000 mA)

– Programmable charge termination current (5.0 mA to 50 mA)

– Integrated 50 mΩ battery isolation MOSFET for operation with no/low battery

– Battery supplement mode

– Battery discharge overcurrent protection, up to 3.0 A

– USB_PHY low dropout linear regulator

– Programmable LED driver (status indicator)

– JEITA-compliant battery temp sensing and charger control

– Key charging parameters can be configured and permanently stored in OTP

– I2C Control Interface permitting processor control and event detection

? LDO/switch supply

– RTC supply VSNVS 3.0 V, 2.0 mA

– Battery backed memory including coin cell charger

? DDR memory reference voltage, VREFDDR, 0.5 V to 0.9 V, 10 mA

? OTP (One time programmable) memory for device configuration

– User programmable start-up sequence, timing, soft-start, and power-down sequence

– Programmable regulator output voltages and charger parameters

? I2C interface

? User programmable Standby, Sleep/Low-power, and Off (REGS_DISABLE) modes

? Ambient temperature range ?40 °C to 105 °C

Applications

? Smart mobile/wearable devices

? Low-power IoT applications

? Wireless game controllers

? Embedded monitoring systems

? Home automation

? POS

? E-Read