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LP85571 数据表(PDF) 3 Page - Texas Instruments |
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LP85571 数据表(HTML) 3 Page - Texas Instruments |
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3 / 49 page  ISET SCL FSET SDA GND GND SW SW LED3 GND SW SW LED2 FB VDD LED1 PWM LED5 LED6 A B C D 1 2 3 4 LED4 SW GND SW FB FSET SDA ISET SCL SW GND SW PWM VDD LED3 LED2 LED6 LED5 GND LED1 LED4 A B C D 4 3 2 1 TOP VIEW BOTTOM VIEW LP8557, LP85571 www.ti.com SNVSA15B – DECEMBER 2013 – REVISED DECEMBER 2015 5 Device Comparison Table ORDERABLE PACKAGE TOP PACKAGE TYPE DEVICE OPTION PINS PACKAGE QTY. DEVICE MARK (DRAWING) LP8557AYFQT 250 "PWM Only" - Recommended for D40 systems without an I2C master LP8557AYFQR 3000 DSBGA (YFQ) 16 LP8557IAYFQT 250 "PWM and I2C" - Recommended for D41 systems with an I2C master LP8557IAYFQR 3000 6 Pin Function and Configurations YFQ Package 16-Pin DSBGA Pin Functions PIN TYPE (1) DESCRIPTION NAME NO. FB B3 A Boost feedback pin. The FB and OVP circuitry monitors the voltage on this pin. Dual function pin. When I2C is not used (for example, BRTMODE = 00b), this pin can be used to set ƒSW and/or ƒPWM by connecting a resistor from this pin to a ground reference. When I 2C is used (for FSET/SDA A3 I/O example, BRTMODE = 01, 10 or 11), connect this pin to an SDA line of an I2C bus. The LP8557 "PWM Only" device option uses this pin as an FSET pin. LP8557I "PWM and I2C" device option uses this pin as an SDA pin. GND C2 G Ground pin. Dual function pin. When I2C is not used (for example, BRTMODE = 00b), this pin can be used to set the full-scale LED current by connecting a resistor from the pin to a ground reference. When I2C is ISET/SCL A4 I used (for example, BRTMODE =01, 10, or 11), connect this pin to an SCL line of an I2C bus. The LP8557 "PWM Only" device option uses this pin as an ISET pin. LP8557I "PWM and I2C" device option uses this pin as an SCL pin. LED1 D4 A LED driver – current sink terminal. If unused, this pin may be left floating. LED2 C4 A LED driver – current sink terminal. If unused, this pin may be left floating. LED3 B4 A LED driver – current sink terminal. If unused, this pin may be left floating. LED4 D3 A LED driver – current sink terminal. If unused, this pin may be left floating. LED5 D2 A LED driver – current sink terminal. If unused, this pin may be left floating. LED6 D1 A LED driver – current sink terminal. If unused, this pin may be left floating. PWM C3 I PWM input pin. SW A1, B1 A A connection to the drain terminal of the integrated power MOSFET. SW_GND A2, B2 G A connection to the source terminal of the integrated power MOSFET. VDD C1 P Device power supply pin. (1) A: Analog Pin, G: Ground Pin, P: Power Pin, I: Digital Input Pin, I/O: Digital Input/Output Pin Copyright © 2013–2015, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LP8557 LP85571 |
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