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Part: MAX745EAP
Category:
Power Management
-> Battery Management
Description: MAX745 Switch-mode Lithium-ion Battery-charger
Company: Maxim Integrated Products
Datasheet: Download MAX745EAP datasheet File size : 211 kB
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Datasheet text preview:
19-1182; Rev 3; 10/01
UAL IT MAN TION K SHEET VALUA E TA WS DA FOLLO
Switch-Mode Lithium-Ion Battery-Charger
____________________________Features
o Charges 1 to 4 Li+ Battery Cells o ±0.75% Voltage-Regulation Accuracy Using 1% Resistors o Provides up to 4A without Excessive Heating o 90% Efficient o Uses Low-Cost Set Resistors and N-Channel Switch o Up to 24V Input o Up to 18V Maximum Battery Voltage o 300kHz Pulse-Width Modulated (PWM) Operation Low-Noise, Small Components o Stand-Alone Operation--No Microcontroller Needed
General Description
T h e MAX745 provides all functions necessary for charging lithium-ion (Li+) battery packs. It provides a regulated charging current of up to 4A without getting hot, and a regulated voltage with only ±0.75% total error at the battery terminals. It uses low-cost, 1% resistors to set the output voltage, and a low-cost N-channel MOSFET as the power switch. The MAX745 regulates the voltage set point and charging current using two loops that work together to transition smoothly between voltage and current regulation. T h e per-cell battery voltage regulation limit is set between 4V and 4.4V using standard 1% resistors, and then the number of cells is set from 1 to 4 by pin-strapping. Total output voltage error is less than ±0.75%. For a similar device with an SMBusTM microcontroller interface and the ability to charge NiCd and NiMH cells, refer to the MAX1647 and MAX1648. For a low-cost Li+ charger using a linear-regulator control scheme, refer to the MAX846A.
MAX745
Ordering Information
PART MAX745C/D MAX745EAP TEMP RANGE 0°C to +70°C 40°C to +85°C PIN-PACKAGE Dice* 20 SSOP
________________________Applications
Li+ Battery Packs Desktop Cradle Chargers Cellular Phones Notebook Computers Hand-Held Instruments
*Dice are tested at TA = +25°C. Pin Configuration appears at end of data sheet.
Typical Operating Circuit
VIN (UP TO 24V) DCIN VL BST DHI LX N
CELL COUNT SELECT ON OFF
CELL0 CELL1 THM/SHDN REF SETI VADJ
MAX745
DLO
N ICHARGE
CS RSENSE
SET PER CELL VOLTAGE WITH 1% RESISTORS
STATUS BATT CCV CCI GND IBAT PGND VOUT 14 Li+ CELLS (UP TO 18V)
SMBus is a trademark of Intel Corp. ________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Switch-Mode Lithium-Ion Battery Charger MAX745
ABSOLUTE MAXIMUM RATINGS
DCIN to GND ...-0.3V to 26V BST, DHI to GND ......-0.3V to 30V BST to LX ...........-0.3V to 6V DHI to LX...........(LX - 0.3V) to (BST + 0.3V) LX to GND ......-0.3V to (DCIN + 0.3V) VL to GND..........-0.3V to 6V CELL0, CELL1, IBAT, STATUS, CCI, CCV, REF, SETI, VADJ, DLO, THM/SHDN to GND........-0.3V to (VL + 0.3V) BATT, CS to GND .....-0.3V to 20V PGND to GND..........-0.3V to 0.3V VL Current .........50mA Continuous Power Dissipation (TA = +70°C) SSOP (derate 8.00mW/°C above +70°C) ...........640mW Operating Temperature Range ...-40°C to +85°C Storage Temperature........-60°C to +150°C Lead Temperature (soldering, 10s) .........+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VDCIN = 18V, VBATT = 8.4V, TA = 0°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.) PARAMETER SUPPLY AND REFERENCE DCIN Input Voltage Range DCIN Quiescent Supply Current VL Output Voltage REF Output Voltage REF Output Load Regulation SWITCHING REGULATOR Oscillator Frequency DHI Maximum Duty Cycle DHI On-Resistance DLO On-Resistance BATT Input Current Output high or low Output high or low VL 5.15V, VBATT = 12V VL 5.15V, VCS = 12V 4V < VBATT < 16V (Note 1) SETI = VREF (full scale) SETI = 400mV Not including VADJ resistor tolerance With 1% tolerance VADJ resistors 170 14 -0.65 -0.75 0 ±1.5 185 18 205 22 +0.65 +0.75 6.0V < VDCIN < 24V, logic inputs = VL 6.0V < VDCIN < 24V, no load TA = +25°C 6.0V < VDCIN < 24V 0 < IREF < 1mA 270 89 5.15 4.17 4.16 CONDITIONS MIN 6 4 5.40 4.2 4.2 10 300 93 4 6 7 14 5 500 5 400 19 TYP MAX 24 6 5.65 4.23 4.24 20 330 UNITS V mA V V mV/mA kHz % µA
CS Input Current BATT, CS Input Voltage Range CS to BATT Offset Voltage CS to BATT Current-Sense Voltage Absolute Voltage Accuracy
µA V mV mV %
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Switch-Mode Lithium-Ion Battery Charger MAX745
ELECTRICAL CHARACTERISTICS (continued)
(VDCIN = 18V, VBATT = 8.4V, TA = 0°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.) PARAMETER ERROR AMPLIFIERS GMV Amplifier Transconductance GMI Amplifier Transconductance GMV Amplifier Output Current GMI Amplifier Output Current CCI Clamp Voltage with Respect to CCV CCV Clamp Voltage with Respect to CCI CONTROL INPUTS/OUTPUTS CELL0, CELL1 Input Bias Current SETI Input Voltage Range VADJ Adjustment Range SETI, VADJ Input Bias Current VADJ Input Voltage Range THM/SHDN Rising Threshold THM/SHDN Falling Threshold STATUS Output Low Voltage STATUS Output Leakage Current IBAT Output Current vs. Current-Sense Voltage IBAT Compliance Voltage Range Charger in current-regulation mode, STATUS sinking 1mA Charger in voltage-regulation mode, VSTATUS = 5V VIBAT = 2V 0 0.9 2 (Note 1) 1.1V < VCCV < 3.5V 1.1V < VCCI < 3.5V 25 25 -1 0 10 -10 0 2.20 2.01 2.3 2.1 +10 VREF 2.34 2.19 0.2 1 CONDITIONS MIN TYP 800 200 ±130 ±320 80 80 200 200 +1 VREF MAX UNITS µA/V µA/V µA µA mV mV µA V % nA V V V V µA µA/mV V
ELECTRICAL CHARACTERISTICS
(VDCIN = 18V, VBATT = 8.4V, TA = -40°C to +85°C, unless otherwise noted. Limits over temperature are guaranteed by design.) PARAMETER SUPPLY AND REFERENCE VL Output Voltage REF Output Voltage SWITCHING REGULATOR (Note 1) Oscillator Frequency DHI On-Resistance DLO On-Resistance CS to BATT Full-Scale Current-Sense Voltage Absolute Voltage Accuracy Not including VADJ resistors Note 1: When VSETI = 0V, the battery charger turns off. Output high or low Output high or low 165 -1.0 260 340 7 14 205 +1.0 kHz mV % CONDITIONS 6.0V < VDCIN < 24V, no load 6.0V < VDCIN < 24V MIN 5.10 4.14 TYP MAX 5.70 4.26 UNITS V V
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