LM2601 Adapter Interface Circuit Adapter Interface Circuit (AIC)

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LM2601 Adapter Interface Circuit Adapter Interface Circuit (AIC)

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LM2601 Adapter Interface Circuit
LM2601 Adapter Interface Circuit
Adapter Interface Circuit (AIC) used sense presence external power source portable computer. notifies computer source present indicates source appropriate charging battery packs inside computer. also senses adapter current direction. isolates adapter signals computer when peak current threshold exceeded. LM2601 drives P-channel FETs. high current rated Schottky diode required implement adapter switchover circuit. This significantly decreases additional heat dissipation during simultaneous fast battery charging while running computer, particularly Maximum Performance mode operation LM2601 shuts down automatically when adapter removed leakage current from battery when powered Drives P-channel FETs, Schottky diodes required reverse inrush current from battery into adapter output capacitance Allows battery capacity gas-gauge calibration under system software/firmware control Adapter over current threshold programmable with external resistors Wide input range: Available TSSOP-14 package
Applications
Portable Computers Portable (Internet Appliances, Information Appliances) Other Battery Powered Devices
Features
Detects AC-DC adapter suitable battery charging airplane power line adapter that should used battery charging Allows implementation intelligent switchover circuits portable systems
Block Diagram
10130901
2001 National Semiconductor Corporation
DS101309
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LM2601
Configuration
TSSOP-14
10130902
Ordering Information
Order Number LM2601MTC LM2601MTCX Package Number MTC14 MTC14 Package Type TSSOP-14 TSSOP-14 Supplied Rail Units/Rail) Tape Reel (2500 Units/Reel)
Partial Rails available, there minimum order quantity. Tape Reel supplied full reels only.
Description
Name DELAY MASTER POWER SOURCE Function capacitor between this ground sets delay risetime. DELAY description Typical Application section. Bi-directional logic pin. driven high external source, indicates that battery powering power bus. driven high AIC, indicates adapter powering bus. cannot drive low. there valid adapter voltage present, output high impedance logic input. input pulled-down internal resistor. Logic input pin. Active high. Grants permission adapter drive both power signal. Logic output pin. High when volts VADAPTER volts. output typically pull-down resistor. source current internally limited part damaged output shorted ground when driven HIGH. Logic output pin. High when VADAPTER volts. output typically pull-down resistor. source current internally limited part damaged output shorted ground when driven HIGH. ground pin. Drives gate disconnect P-ch FET. Drives gate backfeed P-ch FET. Connection current sense resistor control BACKFEED. Connection current sense resistor control DISCONNECT. Power input pin. Output adapter, auto adapter airline adapter.
ADAPTER ENABLE ADAPTER PRESENT CHARGER PRESENT DISCONNECT BACKFEED DIRECTION SENSE PEAK SENSE VADAPTER
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LM2601
Absolute Maximum Ratings
(Note
Storage Temperature Ratings Human Body Model (Note Machine Model (Note
-40°C 125°C 200V
Military/Aerospace specified devices required, please contact National Semiconductor Sales Office/ Distributors availability specifications. VADAPTER VPEAK SENSE, VDIRECTION SENSE, VBACKFEED, VDISCONNECT VADAPTER ENABLE, VMASTER POWER SOURCE VMPS DELAY -0.3V
Operating Ratings (Note
-0.3V VADAPTER -0.3V 5.5V -0.3V Supply Voltage (VADAPTER) Ambient Temp. Range Junction Temp. Range -20°C 70°C -20°C 85°C
Electrical Characteristics
Limits with standard typeface apply 25°C, limits boldface type apply over full temperature range (Note Symbol VAP, VMPSI VMPSO Parameter Adapter Enable 5V-CMOS Logic Input Logic Output Voltage Adapter present, Charger present Master Power Source 5V-CMOS Logic Input Logic Output Voltage Master Power Source Adapter Voltage Low-to-High Transition Hysteresis VCHARGER Adapter Voltage Low-to-High Transition Hysteresis VBACKFEED Current Sense Differential Voltage Threshold Driving Backfeed Vadapter Direction sense, VADAPTER High High Low, ISINK High VADAPTER 5.8V High Conditions 11.7 16.5 0.08 4.75 0.05 12.0 17.0 0.10 VADAPTER 0.5V VADAPTER GND+0.5V, whichever greater 4000 0.25 Units
12.3 17.4 0.12
VADAPTER
VDISCONNECT Current Sense Differential Voltage Vadapter Peak sense, Threshold Driving Disconnect VADAPTER VBACKFEED, VDISCONNECT Control Voltage VADAPTER High VADAPTER
tDRIVE IL,B, IL,D IL,AE TCDELAY
Rise/Fall Time Drive (Note Quiescent Current Leakage Current into Backfeed Disconnect Input Current into Adapter Enable Input Input Current into Input Delay Time Temperature Coefficient
VADAPTER CLoad 3000pF VADAPTER VADAPTER VBACKFEED, VDISCONNECT 3.3V, Backfeed/Disconnect VMPS 5.5V
ppm/°C
Note Absolute Maximum Ratings indicate limits beyond which damage device occur. Operating Ratings indicate conditions which device intended functional, guarantee specific performance limits. guaranteed specifications test conditions, Electrical Characteristics. Note human body model 100pF capacitor discharged through 1.5k resistor into each pin. Note machine model 200pF capacitor discharged directly into each pin. pins rated 200V except pins which rated 100V. Note Datasheet min/max specification limits guaranteed design, test, statistical analysis.
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LM2601
Electrical Characteristics
(Continued)
Note Adapter Enable input used change state Disconnect, Direction Sense input used change state Backfeed. Fall time measured time takes Backfeed Disconnect voltage from high level (approx. VADAPTER 0.5V) (VADAPTER after signal initiated Adapter Enable Direction Sense. Rise time measured time takes Backfeed Disconnect voltage from level (approx. 0.5V) (VADAPTER after signal initiated Adapter Enable Direction Sense.
Typical Application
10130903
Notes RSENSE value should selected guarantee that programmed over current will cause voltage drop across RSENSE approx. 135mV. higher value RSENSE selected then R1/R3 resistor divider should used scale voltage drop down. Internal external circuits associated with Direction Sense Backfeed pins allow emulate Schottky diode functionality with much lower forward voltage drop and, therefore, with much lower power dissipation. R2/R4 resistor divider programs backfeed current protection threshold. backfeed turns when backfeed current pulse level causes more than (typical value) voltage drop between Vadapter Direction Sense pin. Voltage difference (VDIRECTION SENSE VADAPTER) must higher than 20mV reliably isolate adapter case leakage. prevent FETs from turning unless driven LM2601.
CDELAY value calculated from following formula: CDELAY(nF) TDELAY(µs)/90 25°C TDELAY temperature coefficient equals 4000ppm/°C. also Typical Delay Time Temperature graph. Master Power Source (MPS) should connected System Management Controller's (SMC) battery packs' GPIOs. When detects powered adapter active signals Charger Present Adapter Present outputs, asserts Adapter Enable signal isolates battery pack(s). Adapter Enable signal turns Disconnect When adapter unplugged powered off, enables system battery packs. battery packs' embedded controller starts driving logic signal high that turns Disconnect off.
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LM2601
Typical Delay Time Temperature
10130905
Application Information
adapter interface circuit (AIC) provides control functions necessary mating constant voltage output AC-DC adapter airline adapter notebook computer system portable device. allows optimal battery charging during computer operation, allows battery discharge battery gauge calibration. receives control signals from notebook computer, monitors input current from adapter, provides adapter voltage status notebook system management microcontroller embedded controller), appropriately drives MOSFET switches electrically connect adapter computer. will allow system designer solve various power management tasks typical adapter powered systems containing rechargeable battery. When notebook computer being powered from battery adapter plugged computer should start drawing power from adapter, from battery. most time efficient charging scenario when computer draws full rated current from constant voltage adapter. computer uses what needs run, passes remaining power battery charging. computer should able automatically refuse charge battery when powered from airplane power line.
necessary sometimes have computer fully discharging battery then fully recharging (for battery gauge calibration purposes) while being powered adapter. will also allow computer prevent backfeeding current into adapter adapter powered while being plugged into computer (some existing adapters draw current from computer under this conditions charging adapter output bulk capacitance from computer battery). While lowest usable adapter voltage about 9.5V, that VADAPTER 11.7V minus 2.2V hysteresis, operational down VADAPTER This means that will generate false readings down VADAPTER Such false readings would HIGH, ADAPTER PRESENT HIGH, CHARGER PRESENT HIGH. determines usable voltage ranges comparing VADAPTER with internal 2.5V voltage reference (see also Electrical Characteristics). detects operating current limit leakage current limit into adapter jack differential sensing across current sense resistor RSENSE either directly scaled down resistor dividers R1/R3 R2/R4. When designing LM2601 into system necessary consider protection requirements adapter jack according your system design spec.
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LM2601 Adapter Interface Circuit
Physical Dimensions
unless otherwise noted
inches (millimeters)
TSSOP-14 Package 14-Lead Thin Shrink Small-Outline Package Ordering, Refer Ordering Information Table Package Number MTC14
LIFE SUPPORT POLICY NATIONAL'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT GENERAL COUNSEL NATIONAL SEMICONDUCTOR CORPORATION. used herein: Life support devices systems devices systems which, intended surgical implant into body, support sustain life, whose failure perform when properly used accordance with instructions provided labeling, reasonably expected result significant injury user.
National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com www.national.com National Semiconductor Europe Fax: 180-530 Email: europe.support@nsc.com Deutsch Tel: 9508 6208 English Tel: 2171 Tel: 8790
critical component component life support device system whose failure perform reasonably expected cause failure life support device system, affect safety effectiveness.
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National does assume responsibility circuitry described, circuit patent licenses implied National reserves right time without notice change said circuitry specifications.

LM2601 Adapter Interface Circuit Adapter Interface Circuit (AIC)

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