Sunday, March 05, 2017

TPS65070 Handheld Gadget Power Chip

One chip that takes care of all Power requirements in a Portable Electronic Gadget. Power Management Multi-Channel IC (PMIC) Solutions - PMIC Solutions with and without Battery Charger.

TPS65070 Handheld Gadget Power Chip

A battery charger for single Li-Ion or Li-Polymer cell. The voltages needed for an embedded system. Includes PWM mode using I2C. wLED Boost Converter, Touch Screen Interface. 10 Bit A/D Converter too.

TPS65070 Handheld Gadget Power Chip

Charger/Power Path Management:
  • 2A Output Current on the Power Path
  • Linear Charger; 1.5A Maximum Charge
  • I Limit - 100mA/500mA/ 800mA/1300mA
  • Thermal Regulation, Safety Timers
  • Temperature Sense Input
Battery charging, gauging and protection

"As different battery technologies like Lithium Iron Phosphate (LiFePO4) and Super Capacitor are becoming more popular, TI .........."

Figure below shows a complete application diagram that details how to connect the TPS65070 to power an OMAP-L132/L138 application processor.

TEAC USB Interface

The TPS65070 is a single-chip with multiple voltage outputs. Here it provides the different voltages required by the DSP chip. It is a convenient, integrated solution to provide the power to the main chip instead of using separate regulators.

Saturday, March 04, 2017

LT1510 - CC CV Battery Charger

A Circuit for charging NiCd, NiMH and Lithium-Ion Batteries.PWM 500kHz with Soft Start and Shutdown Control.

Linear Technology - LT1510 - CV CC Battery Charger

The LT1510 can charge batteries ranging from 2V to 20V. Ground sensing of current is not required and the battery’s negative terminal can be tied directly to ground. A saturating switch running at 200kHz (500kHz for LT1510-5) giveshigh charging efficiency and small inductor size

LT1510 - CC CV Battery Charger

Notes -

Some things to know in battery charging. A battery that has drained will almost appear like a short circuit to the charger. A battery is never fully drained, if you want a nice battery life. Overcharging a battery can damage it and is not safe too. We have to charge it with an optimum current, upto a Top up charge voltage only. Then a trickle to compensate for internal leakage on no-load. Float charging and Cyclic charging are some popular methods.

It can charge lithium-ion (Li-Ion), nickel-metal-hydride (NiMH) and nickel-cadmium (NiCd). These require constant-current and constant-voltage charging. A 2A peak current switch for Boost Charging may be helpful for charging Lead Acid Batteries too. A 0.1 ohm current sense shunt makes charging current programmable.

3.6v and 3.7v Lithium Battery Charger

The charger is based on the LT1510IN Constant-Voltage/ Constant-Current battery charger IC from Linear Technology. It can be configured to charge NiCd, NiMH or Lithium-Ion (and Lithium-Polymer) batteries at up to 1.5 Amps.

Thursday, March 02, 2017

Fast-Charge Controllers - MAX712 and MAX713

Uses MAX712/MAX713 fast charge controllers. PCB Design too. The only difference between them is the battery-fully-charged sensing method. The MAX713 is designed for NiCd batteries, while the 712 is for NiMh batteries.

Fast, smart and universal NiCd/NiMh battery charger

This is a project by Roberto Barrios at his Ham Projects EB4EQA Site.

Application Note - The MAX712 terminates fast charge by detecting zero voltage slope, while the MAX713 uses a negative voltage-slope detection scheme.

Fast-Charge Controllers - MAX712

The MAX712/MAX713 are powered by the DC source via an on-board +5V shunt regulator. They draw a maximum of 5µA from the battery when not charging.

Fast-Charge Controllers - MAX712 and MAX713

Some Specs
  • Charge 1 to 16 Series Cells
  • Supply Battery's Load While Charging (Linear Mode)
  • Fast Charge from C/4 to 4C Rate
  • C/16 Trickle-Charge Rate
  • Automatically Switch from Fast to Trickle Charge