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MC34675 Datasheet(PDF) 1 Page - Freescale Semiconductor, Inc |
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MC34675 Datasheet(HTML) 1 Page - Freescale Semiconductor, Inc |
1 / 24 page Document Number: MC34675 Rev. 3.0, 4/2008 Freescale Semiconductor Advance Information * This document contains certain information on a new product. Specifications and information herein are subject to change without notice. © Freescale Semiconductor, Inc., 2008. All rights reserved. 28V-Input-Voltage Single-Cell Li-Ion Battery Charger with 10mA Regulator The 34675 is a high-input-voltage Li-Ion battery charger with a 4.85V/10mA linear regulator. The high input voltage, up to 28V, eliminates the input over-voltage protection circuit required in handheld devices such as cell phones, Bluetooth accessories, and portable media players. The 4.85V linear regulator is capable of 10mA output current and can be used to directly power a sub-system such as a USB transceiver. The charge cycle of the 34675 includes trickle, constant-current (CC) and constant-voltage (CV) charge modes. The CC mode current is programmable up to 1A, with an external resistor. The voltage across the external resistor is also used to monitor the actual charge current. The constant voltage is fixed at 4.2V with 0.7% accuracy over the -40°C to 85°C temperature range. The trickle-mode current is pre-set to 20% of the CC mode current when the battery voltage is lower than the trickle-mode threshold. The end-of-charge (EOC) current threshold is pre-set to 10% of the CC mode current, to save board space and cost. A charge current thermal foldback feature limits the charge current when the IC internal temperature rises to the preset threshold of 120°C. The 34675 also protects the system with its input over- voltage protection (OVP) feature. Two indication pins (PPR and CHG) can be simply interfaced to a microprocessor or LEDs. When no power supply is connected, or when disabled, the charger draws less than 1.0 μA leakage current from the battery. Features • No external MOSFET, reverse-blocking diode, or current-sense resistor is required • Guaranteed maximum 1A programmable CC mode current • ±0.7% voltage accuracy over -40°C to 85°C • ±6% current accuracy over -40°C to 85°C • 4.85V/10mA linear regulator with a 6.8V input over-voltage protection threshold • 28V maximum voltage for the power input with a 6.8V over-voltage protection threshold • Trickle charge for fully discharged batteries • Charge current monitor • Charge current thermal foldback • Pb-free packaging designated by suffix code EP Figure 1. 34675 Simplified Application Diagram POWER MANAGEMENT IC EP SUFFIX (PB-FREE) 98ASA10774D 8-PIN UDFN 34675 ORDERING INFORMATION Device Temperature Range (TA) Package MC34675AEP/R2 -40°C to 85°C 8-UDFN VIN ON OFF VIN GND CHG PPR EN BAT ISET DET TO BATTERY TO SYSTEM 34675 CIN COUT RISET CDET |
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