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MCP1259 bảng dữ liệu(PDF) 11 Page - Microchip Technology |
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MCP1259 bảng dữ liệu(HTML) 11 Page - Microchip Technology |
11 / 24 page 2006-2013 Microchip Technology Inc. DS21989B-page 11 MCP1256/7/8/9 3.0 PIN DESCRIPTION The descriptions of the pins are listed in Table 3-1. TABLE 3-1: PIN FUNCTION TABLE 3.1 Status Indication (PGOOD, LBO) 3.1.1 POWER-GOOD OUTPUT PIN (PGOOD) MCP1256/8: PGOOD is high impedance when the out- put voltage is in regulation. A logic low is asserted when the output falls 7% (typical) below the nominal value. The PGOOD output remains low until VOUT is within 3% (typical) of its nominal value. On start-up, this pin indicates when the output voltage reaches its final value. PGOOD is high impedance when SHDN is low or when BYPASS is low (MCP1258). 3.1.2 LOW-BATTERY OUTPUT PIN (LBO) MCP1257/9: LBO is high impedance when the input voltage is above the low-battery threshold voltage. A logic low is asserted when the input falls below the low- battery threshold voltage. The LBO output remains low until VIN is above the low-battery threshold voltage plus the low-battery hysteresis voltage. LBO is high impedance when SHDN is low or when BYPASS is low (MCP1259). 3.2 Mode Selection (SLEEP, BYPASS) 3.2.1 ACTIVE LOW SLEEP MODE (SLEEP) MCP1256/7: A logic low signal applied to this pin places the device into a SLEEP mode of operation. In this mode, the device maintains regulation. SLEEP mode performs pulse skip operation reducing the current draw of the device at the expense of increased output voltage ripple. 3.2.2 ACTIVE LOW BYPASS MODE (BYPASS) MCP1258/9: A logic low signal applied to this pin places the device into a BYPASS mode of operation. In this mode, the input supply voltage is connected directly to the output. 3.3 Flying Capacitor Negative (C2-) A 1 µF ceramic flying capacitor is recommended. 3.4 Flying Capacitor Positive (C1+) A 1 µF ceramic flying capacitor is recommended. 3.5 Regulated Output Voltage (VOUT) Regulated 3.3V output. Bypass to GND with a minimum of 2.2 µF. 3.6 Flying Capacitor Positive (C2+) A 1 µF ceramic flying capacitor is recommended. 3.7 Power Supply Input Voltage (VIN) A supply voltage of 1.8V to 3.6V is recommended. Bypass to GND with a minimum of 1 µF. 3.8 Flying Capacitor Negative (C1-) A 1 µF ceramic flying capacitor is recommended. 3.9 0V Reference (GND) Connect to negative terminal of and input supply. 3.10 Device Shut Down (SHDN) A logic low signal applied to this pin disables the device. A logic high signal applied to this pin allows normal operation. Pin No. Symbol Function DFN MSOP 1 1 PGOOD Power-Good Indication Open-Drain Output Pin: MCP1256 and MCP1258 LBO Low-Battery Indication Open-Drain Output Pin: MCP1257 and MCP1259 22 SLEEP Active Low SLEEP Mode Input Pin: MCP1256 and MCP1257 BYPASS Active Low BYPASS Mode Input Pin: MCP1258 and MCP1259 3 3 C2- Flying Capacitor Negative Pin 4 4 C1+ Flying Capacitor Positive Pin 55 VOUT Regulated 3.3V Output Voltage 6 6 C2+ Flying Capacitor Positive Pin 77 VIN Power Supply Input Voltage 8 8 C1- Flying Capacitor Negative Pin 9 9 GND 0V Reference 10 10 SHDN Active Low SHUTDOWN Mode Input Pin |
Số phần tương tự - MCP1259 |
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Mô tả tương tự - MCP1259 |
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