LP3947ISD-51 National Semiconductor, LP3947ISD-51 Datasheet
LP3947ISD-51
Specifications of LP3947ISD-51
Available stocks
Related parts for LP3947ISD-51
LP3947ISD-51 Summary of contents
Page 1
... Features n Supports USB Charging Scheme n Integrated Pass Transistor Typical Application Circuit More Application Circuit can be found in the Application Note section. © 2006 National Semiconductor Corporation n Near-Depleted Battery Preconditioning n Monitors Battery Temperature n Built-In 5.6 hour timer n Under Voltage and Over Voltage Lockout ...
Page 2
... GND Ordering Information LP3947 Supplied as 1000 Units, Tape and Reel LP3947ISD-09 LP3947ISD-51 *Other default options are available. Please contact National Semiconductor sales office/distributors for availability and specifications. www.national.com (Top View) See NS Package Number SDA14B Description , or removing the thermistor by physically disconnecting the battery, sets the ...
Page 3
LP3947 Functional Block Diagram 3 20111003 www.national.com ...
Page 4
... Absolute Maximum Ratings 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. CHG-IN All pins except GND and CHG-IN (Note 3) Junction Temperature Storage Temperature Power Dissipation (Note 4) ESD (Note 5) Human Body Model ...
Page 5
Electrical Characteristics Unless otherwise noted 5V, V CHG-IN mal type apply for T = 25˚C. Limits appearing in boldface type apply over the entire junction temperature range for operation −40˚C to +85˚C. (Notes 7, 8, ...
Page 6
Electrical Characteristics, I Unless otherwise noted CHG-IN 25˚C. Limits appearing in boldface type apply over the entire junction temperature range for operation, T (Notes Symbol Parameter t Set-Up Time Repeated START SU Condition t ...
Page 7
Application Notes LP3947 CHARGER OPERATION The LP3947 charge cycle is initiated with AC adaptor or USB power source insertion. If the voltage on the CHG-IN pin meets under-voltage (V ), over-voltage (V UVLO-TSHD ) requirements, and the Adaptor OK signal ...
Page 8
Application Notes (Continued) www.national.com FIGURE 3. LP3947 Charger Flow Chart 8 20111007 ...
Page 9
Application Notes (Continued) CHARGE CURRENT SELECTION IN CONSTANT CURRENT MODE In the AC adaptor mode, the LP3947 is designed to provide a charge current ranging from 100 mA to 750 mA, in steps of 50 mA, to support batteries with ...
Page 10
Application Notes (Continued) Charger Off Charging Li Ion Battery* Maintenance Mode Charging Li Ion Battery after Passing Maintenance Mode EN Pin = LOW LDO Mode 5.6 Hr Safety Timer Flag/Battery Temperature Violation * Charging Li Ion battery for the first ...
Page 11
Application Notes (Continued) FIGURE 5. Power Up Timing Diagram in Charger Mode (1.39V FIGURE 6. Power Up Timing Diagram in LDO Mode (Ts ≥ 2.7V) MODE PIN The mode pin toggles the LP3947 between the AC adaptor mode and the ...
Page 12
Application Notes (Continued) TABLE 3. LP3947 Serial Port Communication address code 7h’47 Addrs Register 7 6 8'h00 Charger Register -1 8'h01 Charger Register -2 8'h02 Charger Register -3 Numbers in parentheses indicate default setting. “0” bit is set to low ...
Page 13
Application Notes (Continued write (sda = “0” read (sda = “1”) ack = acknowledge (sda pulled low by either master or slave) Nack = No Acknowledge rs = repeated start THERMAL PERFORMANCE OF LLP PACKAGE The ...
Page 14
... BANNED SUBSTANCE COMPLIANCE National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C2) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/quality/green. ...