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MCP73831-3ACI/MC bảng dữ liệu(PDF) 11 Page - Microchip Technology |
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MCP73831-3ACI/MC bảng dữ liệu(HTML) 11 Page - Microchip Technology |
11 / 28 page © 2008 Microchip Technology Inc. DS21984E-page 11 MCP73831/2 3.0 PIN DESCRIPTION The descriptions of the pins are listed in Table 3-1. TABLE 3-1: PIN FUNCTION TABLES 3.1 Battery Management Input Supply (VDD) A supply voltage of [VREG (typical) + 0.3V] to 6V is recommended. Bypass to VSS with a minimum of 4.7 µF. 3.2 Battery Charge Control Output (VBAT) Connect to positive terminal of battery. Drain terminal of internal P-channel MOSFET pass transistor. Bypass to VSS with a minimum of 4.7 µF to ensure loop stability when the battery is disconnected. 3.3 Charge Status Output (STAT) STAT is an output for connection to an LED for charge status indication. Alternatively, a pull-up resistor can be applied for interfacing to a host microcontroller. STAT is a tri-state logic output on the MCP73831 and an open-drain output on the MCP73832. 3.4 Battery Management 0V Reference (VSS) Connect to negative terminal of battery and input supply. 3.5 Current Regulation Set (PROG) Preconditioning, fast charge and termination currents are scaled by placing a resistor from PROG to VSS. The charge management controller can be disabled by allowing the PROG input to float. 3.6 Exposed Thermal Pad (EP) There is an internal electrical connection between the Exposed Thermal Pad (EP) and the VSS pin; they must be connected to the same potential on the Printed Circuit Board (PCB). Vias are recommended to add from land area of EP to a copper layer on the other side of the PCB for better thermal performance. Pin No. Symbol Function DFN SOT-23-5 14 VDD Battery Management Input Supply 2— VDD Battery Management Input Supply 33 VBAT Battery Charge Control Output 4— VBAT Battery Charge Control Output 5 1 STAT Charge Status Output 62 VSS Battery Management 0V Reference 7 — NC No Connection 8 5 PROG Current Regulation Set and Charge Control Enable 9— EP Exposed Thermal Pad (EP); must be connected to VSS. |
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