Manuals / LG Electronics / Cell Phone / Cell Phone

LG Electronics U250 service manual Pmic Functional Block Diagram U300 PM6650-2M, Usbotg

Models: U250

1 175
Download 175 pages 27.32 Kb
Page 26
Image 26

3. TECHNICAL BRIEF

3.5.4 PMIC Functional Block Diagram (U300 : PM6650-2M)

•Input power management

-Valid external supply attachment and removal detection

-Supports unregulated (closed-loop) external charger supplies and USB supplies as input power sources

-Supports lithium-ion main batteries

-Trickle, constant current, constant voltage, and pulsed charging of the main battery

-Supports coin cell backup battery (including charging)

-Battery voltage detectors with programmable thresholds

-VDD collapse protection

-Charger current regulation and real-time monitoring for over-current protection

-Charger transistor protection by power limit control

-Control drivers for two external pass transistors and one external battery MOSFET - MOSFET is optional

-Voltage, current, and power control loops

-Automated recovery from sudden momentary power loss

•Output voltage regulation

-One boost (step-up) switched-mode power supply (SMPS) for driving white LEDs and hosting

USBOTG

-Three buck (step-down) switched-mode power supplies that efficiently generate MSMC, MSME, and PA (or second MSMC) supply voltages

-Supports dynamic voltage scaling (DVS) for MSMC and PA

-Eleven low dropout regulator circuits with programmable output voltages, implemented using three different current ratings: 300 mA (two), 150 mA (six), and 50 mA (three). These can be used to power MSMA, MSMP, RFRX1, RFRX2, RFTX, SYNT, TCXO, WLAN, MMC, USB, and RUIM circuits.

-All regulators can be individually enabled/disabled for power savings

-Low power mode available on MSMA and MSMP regulators

-All regulated outputs are derived from a common bandgap reference-close tracking

•Integrated handset-level housekeeping functions reduces external parts count, size, cost

-Analog multiplexer selects from 8 internal and up to 18 external inputs

-Multiplexer output’s offset and gain are adjusted, increasing the effective ADC resolution

-Adjusted multiplexer output is buffered and routed to an MSM device ADC

-Dual oscillators - 32.768 kHz off-chip crystal and on-chip RC assures MSM device sleep clock

-Crystal oscillator detector and automated switch-over upon lost oscillation

-Real time clock for tracking time and generating associated alarms

-On-chip adjustments minimize crystal oscillator frequency errors

-Circuits control TCXO warm-up and synchronize, deglitch, and buffer the TCXO signal

-TCXO buffer control for optimal QPH/catnap timing

-Three-stage over-temperature protection (smart thermal control)

- 27 -

Page 25 Page 27
Page 26
Image 26
LG Electronics U250 service manual Pmic Functional Block Diagram U300 PM6650-2M, Usbotg
Page 25 Page 27

U250 specifications

The LG Electronics U250 is a distinguished device known for its cutting-edge features and innovative technologies within the mobile phone sector. Launched as part of LG's effort to cater to a growing demand for functional yet stylish smartphones, the U250 boasts an array of characteristics that appeal to a savvy clientele.

One of the primary features of the U250 is its impressive display. Sporting a vibrant screen that offers excellent color reproduction and clarity, it enhances the user experience for gaming and multimedia consumption. The responsive touchscreen interface allows for seamless navigation, making it user-friendly for all age groups.

The U250 is powered by a robust processor that ensures smooth performance, whether multitasking between applications or running demanding games. With ample RAM, it minimizes lag and enhances the overall operating experience, allowing users to switch effortlessly between tasks.

Photography enthusiasts will appreciate the U250's advanced camera system. It is equipped with a high-resolution primary camera that captures stunning images in various lighting conditions. The inclusion of features like autofocus and image stabilization significantly elevates the quality of photos and videos. Additionally, the front-facing camera is designed for high-quality selfies and video calls, ensuring that users can always stay connected.

The device supports a range of connectivity options, including 4G LTE, Bluetooth, and Wi-Fi, ensuring users can remain connected to the world around them. The integration of NFC technology also enables quick and convenient transactions, particularly useful in a cashless society.

Battery life is another standout characteristic of the U250. With a durable battery, it offers extended usage time, allowing users to go through their day without the constant worry of recharging. Coupled with fast-charging capabilities, it reduces downtime significantly.

The LG U250 runs on an intuitive operating system that provides easy access to a plethora of apps on the platform. Customization options are abundant, allowing users to tailor their device's appearance and functionality to suit their preferences.

In conclusion, the LG Electronics U250 combines striking design with versatile functionality, making it a formidable entry in the smartphone market. With its impressive display, powerful performance, advanced camera features, and strong battery life, the U250 is poised to meet the needs of modern users seeking both style and substance in a mobile device. Whether for work or leisure, this smartphone is designed to enhance everyday life.