MAX1772 19-1772 Rev 4 2/09 Low-Cost, Multichemistry Battery- Charger Building Block General Description Features The MAX1772 is a highly-integrated, multichemistry Input Current Limiting battery-charger control IC that simplifies the construc- 0.5% Output Voltage Accuracy Using Internal tion of accurate and efficient chargers. The MAX1772 Reference (0C to +85C) uses analog inputs to control charge current and volt- age and can be programmed by the host or hardwired. Programmable Battery Charge Current >4A High efficiency is achieved by a buck topology with synchronous rectification. Analog Inputs Control Charge Current and Charge Voltage Maximum current drawn from the AC adapter is pro- grammable to avoid overloading the AC adapter when Monitor Outputs for: supplying the load and the battery charger simultane- Current Drawn from AC Input Source ously. This enables the user to reduce the cost of the Charging Current AC adapter. The MAX1772 provides outputs that can AC Adapter Present be used to monitor the current drawn from the AC adapter, battery-charging current, and the presence of Up to 18.2V (max) Battery Voltage an AC adapter. 8V to 28V Input Voltage The MAX1772 can charge two to four lithium-ion (Li+) > 95% Efficiency series cells, easily providing 4A. When charging, the MAX1772 automatically transitions from regulating cur- 99.99% (max) Duty Cycle for Low-Dropout rent to regulating voltage. It is available in a space-sav- Operation ing 28-pin QSOP package. Charges Any Battery Chemistry: Li+, NiCd, NiMH, Applications Lead Acid, etc. Notebook and Subnotebook Computers Personal Digital Assistants Handheld Terminals Pin Configuration Ordering Information PART TEMP RANGE PIN-PACKAGE TOP VIEW MAX1772EEI -40 C to +85C 28 QSOP DCIN 1 28 IINP MAX1772EEI+ -40C to +85C 28 QSOP +Denotes lead(Pb)-free/RoHS-compliant package. LDO 2 27 CSSP CLS 3 26 CSSN REF 4 25 BST CCS 5 24 DHI MAX1772 CCI 6 23 LX CCV 7 22 DLOV GND 8 21 DLO GND 9 20 PGND ICHG 10 19 CSIP ACIN 11 18 CSIN ACOK 12 17 BATT REFIN 13 16 CELLS ICTL 14 15 VCTL QSOP Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.Low-Cost, Multichemistry Battery- Charger Building Block ABSOLUTE MAXIMUM RATINGS DCIN, CSSP, CSSN to GND...................................-0.3V to +30V DLO to PGND .........................................-0.3V to (V + 0.3V) DLOV BST to GND............................................................-0.3V to +36V LDO Short-Circuit Current ..................................................50mA BST to LX..................................................................-0.3V to +6V Continuous Power Dissipation (T = +70C) A DHI to LX...................................................-0.3V to (V + 0.3V) 28-Pin QSOP (derate 12.6mW/C above +70C).......1008mW BST LX to GND .................................................................-6V to +30V Junction-to-Ambient Thermal Resistance ( ) JA BATT, CSIP, CSIN to GND........................................-0.3V to 20V (Note 1) .....................................................................79.3C/W CSIP to CSIN or CSSP to CSSN or Junction-to-Case Thermal Resistance ( ) JC PGND to GND ...............-0.3V to +0.3V (Note 1) ........................................................................27C/W CCI, CCS, CCV, DLO, ICHG, IINP, Operating Temperature Range ...........................-40C to +85C ACIN, REF to GND ...............................-0.3V to (V + 0.3V) Junction Temperature ........................................................150C LDO DLOV, VCTL, ICTL, REFIN, CELLS, Storage Temperature Range .............................-60C to +150C CLS, LDO, ACOK to GND ....................................-0.3V to +6V Lead Temperature (soldering, 10s) .................................+300C DLOV to LDO.........................................................-0.3V to +0.3V Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. 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 (V = V = V = 18V, V = V = V = 12V, V = 3.0V, V = V = 0.75 V , V = 2.0V, DCIN CSSP CSSN BATT CSIP CSIN REFIN VCTL ICTL REFIN CELLS V = 0V, CLS = REF, V - V = 4.5V, V = V = 0V, C = 1F, LDO = DLOV, C = 1F pins CCI, CCS, and CCV ACIN BST LX GND PGND LDO REF are compensated per Figure 1a T = 0C to +85C, unless otherwise noted. Typical values are at T = +25C.) A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SUPPLY AND LDO REGULATOR V DCIN Input Voltage Range DCIN 8 28 V V falling 7.0 7.4 DCIN DCIN Undervoltage Lockout V Trip Point V rising 7.5 7.85 DCIN DCIN Quiescent Current I 8.0V < V < 28V 2.7 6.0 mA DCIN DCIN LDO Output Voltage 8.0V < V < 28V, no load 5.25 5.40 5.55 V DCIN LDO Load Regulation 0 < I < 10mA 34 100 mV LDO LDO Undervoltage Lockout V = 8.0V 3.20 4.00 5.15 V DCIN Trip Point REF Output Voltage 0 < I < 500A REF 4.072 4.096 4.120 V REF Undervoltage Lockout V falling 3.1 3.9 V REF Trip Point TRIP POINTS V falling BATT POWER FAIL Threshold CSSP 50 100 150 mV BATT POWER FAIL Threshold 100 200 300 mV Hysteresis V rising ACIN Threshold 2.007 2.048 2.089 V ACIN ACIN Threshold Hysteresis 0.5% of V 10 20 30 mV REF ACIN Input Bias Current V = 2.048V -1 +1 A ACIN CLS Input Range 1.6 REF V CLS Input Bias Current V = 2.0V -1 +1 A CLS SWITCHING REGULATOR Minimum Off-Time V =16.8V 1.00 1.25 1.50 s BATT 2 MAX1772