DC099A - LT1512CS8 Evaluation Kit

Features

  • DC099A - LT1512CS8 Evaluation Kit
  • Disclaimer: Linear Technology cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Linear Technology product. No circuit patent licenses are implied. Linear Technology reserves the right to change the circuitry and specifications without notice at any time.

Typical Application

DC099A
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Description

Demonstration Board DC099 is a complete Lithium-Ion
constant-current/constant-voltage battery charger
designed for 1- or 2-cell applications. The LT1512 is
used in the SEPIC (single-ended primary inductance converter)
current mode topology, which allows the input
voltage to the charger to be less than, equal to or greater
than the battery-charging voltage. The 500kHz switching
frequency allows small surface mount components to be
used, minimizing board space and height. The printed
circuit area required for the complete charger is less than
0.7in2, making it ideal for base stations and portable
handheld devices such as palmtops and cellular phones.
The SEPIC topology allows the current sense circuit to be
completely separated from the battery, simplifying battery
switching and system grounding problems. It also eliminates
the DC current path from the battery to the input
when the charger is off.

In addition to the 1% constant-voltage accuracy, the
LT1512 also contains circuitry to provide a constantcurrent
charge with a 5% accuracy. The IC includes a 1.5A
switch that can provide up to 1A charging current for some
conditions. The maximum charge current is dependent
upon the input voltage and whether the converter is
stepping the input voltage up or down.
Located on the demo board is a jumper to select the
correct charging voltage for either 1- or 2-cell applications
(4.2V or 8.4V), although up to five cells can be charged by
changing resistor values. On this board, the charging
current is set at 0.4A by resistor R3.
A dual function pin (SYNC and/or SHUTDOWN) can be
used to synchronize the switching frequency to a higher
external clock frequency and can also be used for a low
quiescent current shutdown (12mA).
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Packaging

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Order Info

Evaluation Kits

Part Number Description Price
DC099A LT1512 | 0.4A LI-ION SEPIC BATTERY CHARGER (dual or single) $125.00
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Applications

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Simulate

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