Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - battery management Charge management Any type SSOP 20 Surface-mount

General Description

The MAX1667 provides the power control necessary to

charge batteries of any chemistry. All charging functions

are controlled through the Intel System Management Bus

(SMBus™) interface. The SMBus 2-wire serial interface

sets the charge voltage and current and provides thermal

status information. The MAX1667 functions as a Level 2

charger, compliant with the Duracell/Intel Smart Battery

Charger Specification.

In addition to the feature set required for a Level 2 charg-

er, the MAX1667 generates interrupts to signal the host

when power is applied to the charger or when a battery is

installed or removed. Additional status bits allow the host

to check whether the charger has enough input voltage,

and whether the voltage on or current into the battery is

being regulated. This allows the host to determine when

lithium-ion (Li+) batteries have completed the charge with-

out interrogating the battery.

The MAX1667 is available in a 20-pin SSOP with a 2mm

profile height.

________________________Applications

Notebook Computers Charger Base Stations

Personal Digital Assistants Phones

____________________________Features

♦ Charges Any Battery Chemistry: Li+, NiCd,

NiMH, Lead Acid, etc.

♦ SMBus 2-Wire Serial Interface

♦ Compliant with Duracell/Intel Smart Battery

Charger Specification Rev. 1.0

♦ 4A, 3A, or 1A (max) Battery Charge Current

♦ 5-Bit Control of Charge Current

♦ Up to 18.4V Battery Voltage

♦ 11-Bit Control of Voltage

♦ ±1% Voltage Accuracy

♦ Up to +28V Input Voltage

♦ Battery Thermistor Fail-Safe Protection

♦ Greater than 95% Efficiency

♦ Synchronous Rectifier

MAX1667

Chemistry-Independent,

Level 2 Smart Battery Charger

________________________________________________________________ Maxim Integrated Products 1

Typical Operating Circuit

PART

MAX1667EAP -40°C to +85°C

TEMP RANGE PIN-PACKAGE

20 SSOP

Ordering Information

SMBus is a trademark of Intel Corp.

19-1488; Rev 1; 5/03

MAX1667

DCIN

REF BST

DHI

DLO

PGND

INT

BATT

SCL

SDA

THM

IOUT

CHARGE SOURCE

AGND

SEL

DACV

CCV

CCI

HOST

CONTROLLER

SMART

BATTERY

SCL

SDA

INT

GND

BATT+

SENSE

SCL

SDA

TEMP

BATT-

Pin Configuration appears at end of data sheet.

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.

Summary of content (26 pages)

PAGE 1
9-1488; Rev 1; 5/03 Chemistry-Independent, Level 2 Smart Battery Charger ____________________________Features ♦ Charges Any Battery Chemistry: Li+, NiCd, NiMH, Lead Acid, etc. The MAX1667 is available in a 20-pin SSOP with a 2mm profile height. ♦ Greater than 95% Efficiency ♦ SMBus 2-Wire Serial Interface ♦ Compliant with Duracell/Intel Smart Battery Charger Specification Rev. 1.0 ♦ 4A, 3A, or 1A (max) Battery Charge Current ♦ 5-Bit Control of Charge Current ♦ Up to 18.
PAGE 2
MAX1667 Chemistry-Independent, Level 2 Smart Battery Charger ABSOLUTE MAXIMUM RATINGS DCIN to AGND .......................................................-0.3V to +30V BST to AGND..........................................................-0.3V to +36V BST, DHI to LX..........................................................-0.3V to +6V LX, IOUT to AGND..................................................-0.3V to +30V THM, CCI, CCV, DACV, REF, DLO to AGND .............................................-0.
PAGE 3
Chemistry-Independent, Level 2 Smart Battery Charger (VDCIN = 18V, internal reference, 1µF capacitor at REF, 1µF capacitor at VL, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C, unless otherwise noted.) PARAMETER CONDITIONS MIN TYP MAX UNITS ERROR AMPLIFIERS GMV Amplifier Transconductance 1.4 mA/V GMI Amplifier Transconductance 0.2 mA/V GMV Amplifier Maximum Output Current ±80 µA GMI Amplifier Maximum Output Current ±200 µA CCV Clamp Voltage with Respect to CCI 1.
PAGE 4
MAX1667 Chemistry-Independent, Level 2 Smart Battery Charger ELECTRICAL CHARACTERISTICS (VDCIN = 18V, internal reference, 1µF capacitor at REF, 1µF capacitor at VL, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C. Limits over this temperature range are guaranteed by design.) PARAMETER CONDITIONS MIN TYP MAX UNITS 4 6 mA 5.4 5.65 V 4.137 V 250 310 kHz SUPPLY AND REFERENCE DCIN Quiescent Current 7.5V < VDCIN < 28V, logic inputs = VL VL Output Voltage 7.
PAGE 5
Chemistry-Independent, Level 2 Smart Battery Charger MAX1667 TIMING CHARACTERISTICS (Figures 1 and 2) (TA = 0°C to +85°C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SCL Serial-Clock High Period tHIGH 4 µs SCL Serial-Clock Low Period tLOW 4.7 µs Start-Condition Setup Time tSU:STA 4.
PAGE 6
MAX1667 Chemistry-Independent, Level 2 Smart Battery Charger START CONDITION MOST SIGNIFICANT ADDRESS BIT (A6) CLOCKED INTO SLAVE A5 CLOCKED INTO SLAVE A4 CLOCKED INTO SLAVE A3 CLOCKED INTO SLAVE SCL tHIGH tLOW tHD:STA SDA tSU:STA tSU:DAT tHD:DAT tSU:DAT tHD:DAT Figure 1. SMBus Serial-Interface Timing—Address MOST SIGNIFICANT BIT OF DATA CLOCKED INTO MASTER ACKNOWLEDGE BIT CLOCKED INTO MASTER RW BIT CLOCKED INTO SLAVE SCL SLAVE PULLING SDA LOW SDA tDV tDV Figure 2.
PAGE 7
Chemistry-Independent, Level 2 Smart Battery Charger LOAD TRANSIENT (VOLTAGE REGULATION WITH CURRENT LIMIT) CCV 200mV/div CCI CCV CCI CCV CCI CCI CCV 50mV/div CCI 2V 1.4V VBATT 10V 5V/div CCV CCV ILOAD VBATT ILOAD 1A 1A/div 1A 500mA/div 10V 5V/div AVERAGED MEASUREMENT AVERAGED MEASUREMENT 500µs/div VDCIN = 18V ChargingVoltage() = 12,000mV ChargingCurrent() = 1500mA 1ms/div VDCIN = 18V ChargingVoltage() = 12,000mV ChargingCurrent() = 1500mA VL LOAD REGULATION VL LINE REGULATION 5.
PAGE 8
Typical Operating Characteristics (continued) (Circuit of Figure 7, TA = +25°C, unless otherwise noted.) EFFICIENCY vs. LOAD CURRENT (VOLTAGE REGULATION) B 90 EFFICIENCY (%) 4.100 4.095 4.090 D 4.080 C 70 A: VDCIN = 20V, VBATT = 17V B: VDCIN = 16V, VBATT = 12.75V C: VDCIN = 20V, VBATT = 12.75V D: VDCIN = 16V, VBATT = 8.5V E: VDCIN = 20V, VBATT = 8.
PAGE 9
Chemistry-Independent, Level 2 Smart Battery Charger PIN NAME FUNCTION 1 IOUT Linear Current-Source Output 2 DCIN Input Voltage for Powering Charger 3 VL 4 CCV IC Power Supply. 5.4V linear-regulator output from DCIN. Voltage-Regulation-Loop Compensation Point 5 CCI Current-Regulation-Loop Compensation Point 6 SEL Current-Range Selector. Connecting SEL to VL sets a 4A full-scale current. Leaving SEL open sets a 3A full-scale current. Connecting SEL to AGND sets a 1A full-scale current.
PAGE 10
MAX1667 Chemistry-Independent, Level 2 Smart Battery Charger VCC +12V, -12V SYSTEM POWER SUPPLY DC (UNREGULATED) / VBATTERY SYSTEM POWER CONTROL AC DC (UNREGULATED) VBATTERY SYSTEM HOST (SMBus HOST) SMART BATTERY SAFETY SIGNAL AC-DC CONVERTER (UNREGULATED) MAX1667 SMART BATTERY CHARGER CRITICAL EVENTS BATTERY DATA/STATUS REQUESTS CHARGING VOLTAGE/CURRENT REQUESTS SMBus CRITICAL EVENTS Figure 3.
PAGE 11
Chemistry-Independent, Level 2 Smart Battery Charger MAX1667 AC SYSTEM POWER SUPPLY DC (UNREGULATED) / VBATTERY NOTE: SB 1 POWERING SYSTEM SB 2 CHARGING AC-DC CONVERTER (UNREGULATED) SMBus SIGNAL SMART BATTERY 2 VBATT SMBus SIGNAL SAFETY VBATT SMART BATTERY 1 SAFETY VCC +12V, -12V SMBus SYSTEM HOST (SMBus HOST) MAX1667 SMART BATTERY SELECTOR SAFETY SIGNAL VCHARGE SMART BATTERY CHARGER CRITICAL EVENTS BATTERY DATA/STATUS REQUESTS SMBus Figure 4.
PAGE 12
MAX1667 Chemistry-Independent, Level 2 Smart Battery Charger control loops can be compensated separately for optimum stability and response in each state. Whether the MAX1667 is controlling the voltage or current at any time depends on the battery’s state. If the battery has been discharged, the MAX1667’s output reaches the current-regulation limit before the voltage limit, causing the system to regulate current.
PAGE 13
Chemistry-Independent, Level 2 Smart Battery Charger MAX1667 REF 10k 10k 10k DCIN 10k 7mA MAX1667 THERMISTOR_OR IOUT THERM_SHUT THERMAL SHUTDOWN THERMISTOR_COLD SEL LOGIC BLOCK THM SCL THERMISTOR_HOT SDA DCIN INT VL THERMISTOR_UR 100k 30k 3k AC_PRESENT INTERNAL 4.096V REFERENCE 5.4V LINEAR REGULATOR 500Ω REF AGND AGND CCV CCV_LOW 3R REF CS CURRENT-SENSE LEVEL SHIFT AND GAIN OF 5.
PAGE 14
MAX1667 Chemistry-Independent, Level 2 Smart Battery Charger across the current-sense resistor (R SEN ) (which is between the CS and BATT pins), amplifies it by approximately 5.45, and level shifts it to ground. The full-scale current is approximately 0.16V/RSEN, and the resolution is 5mV/RSEN. The current-regulation loop is compensated by adding a capacitor to the CCI pin. This capacitor sets the currentfeedback loop’s dominant pole.
PAGE 15
Chemistry-Independent, Level 2 Smart Battery Charger AGND IOUT MAX1667 10 1 C9 C4 DCIN 9 SEL REF VL R3 2 6 D3 R6 3 C10 R4 12 THM R5 C5 (NOTE 2) MAX1667 BST D4* C6 D2 20 C11 5 CCI DHI C3 DC SOURCE M1 18 C7 LX DLO 4 7.5V–28V 19 D1 L1 M2 17 CCV PGND R2 16 (NOTE 1) C1 C2 CS 7 R1 INT = HIGH-CURRENT TRACES (8A MAX) 14 D5 11 NOTE 1: C6, M2, D1, AND C1 GROUNDS MUST CONNECT TO THE SAME RECTANGULAR PAD ON THE LAYOUT. NOTE 2: C5 AND C11 MUST BE PLACED WITHIN 0.
PAGE 16
MAX1667 Chemistry-Independent, Level 2 Smart Battery Charger Table 2a. Component Selection DESIGNATION MANUFACTURER 1A 3A 4A 68µF, 20V, low ESR C1 Output Capacitor AVX TPSE686M020R0150 Sprague 594D686X0025R2T C2, C7, C11 0.
PAGE 17
Chemistry-Independent, Level 2 Smart Battery Charger PHONE FAX AVX MANUFACTURER 803-946-0690 803-626-3123 Central Semiconductor 516-435-1110 516-435-1824 Coilcraft 847-639-6400 847-639-1469 Coiltronics 561-241-7876 561-241-9339 Dale 605-668-4131 605-665-1627 IR 310-322-3331 310-322-3332 IRC 512-992-7900 512-992-3377 NIEC 805-867-2555 805-867-2698 Siliconix 408-988-8000 408-970-3950 Sprague 603-224-1961 603-224-1430 Sumida 847-956-0666 847-956-0702 Zetex 516-543-7100 516
PAGE 18
MAX1667 Chemistry-Independent, Level 2 Smart Battery Charger Table 3. ChargerMode() Bit Functions BIT POSITION* POR VALUE** INHIBIT_CHARGE 0 (LSB) 0 0 = Allow normal operation; clear the CHG_INHIBITED status bit. 1 = Turn the charger off; set the CHG_INHIBITED status bit. ENABLE_POLLING 1 — Not implemented. Write 0 into this bit. POR_RESET 2 — 0 = No change in any non-ChargerMode() settings.
PAGE 19
Chemistry-Independent, Level 2 Smart Battery Charger MAX1667 a) Write-Word Format S SLAVE ADDRESS W ACK COMMAND BYTE ACK LOW DATA BYTE ACK HIGH DATA BYTE ACK 7 bits 1b 1b 8 bits 1b 8 bits 1b 8 bits 1b MSB LSB 0 MSB LSB MSB LSB ChargerMode() = 0x12 ChargingCurrent() = 0x14 ChargerVoltage() = 0x15 AlarmWarning() = 0x16 Preset to 0b0001001 D7 P MSB LSB D0 D15 D8 b) Read-Word Format S SLAVE ADDRESS W ACK 7 bits 1b 1b MSB LSB 0 COMMAND ACK BYTE 8 bits SLAVE ADDRESS R A
PAGE 20
MAX1667 Chemistry-Independent, Level 2 Smart Battery Charger 18.416V 16.368V VREF = 4.096V DCIN > 20V VOLTAGE SET POINT (V0) 12.592V 8.400V 4.192V 0V 0b000000000000xxxx 0x000x 0b000100000110xxxx 0x106x 0b001000001101xxxx 0x20Dx 0b001100010011xxxx 0x313x 0b010010100000xxxx 0x47Fx 0b111111111111xxxx 0xFFFx ChargingVoltage() D15–D0 DATA 160 SEL = VL 115 SEL = OPEN 1000 SEL = GND 35 RESISTANCE (kΩ) AVERAGE CS-BATT VOLTAGE IN CURRENT REGULATION (mV) Figure 9.
PAGE 21
Chemistry-Independent, Level 2 Smart Battery Charger BIT POSITION D15 D14 D13 D12 D11 FUNCTION FS* WEIGHT IN mA (RSENSE = 40mΩ) 3968* D10 D9 D8 D7 DA3 DA2 DA1 DA0 IOUT** 2048 1024 512 256 128 7** DA4 D6 D5 D4 D3 D2 D1 D0 * When SEL = VL, values above 0x0F80 set the output current to 3.968A. When SEL = OPEN, values above 0x0B80 set the output current to 2.944A. When SEL = GND, values above 0x0380 set the output current to 0.896A.
PAGE 22
(Note 1) ALARM_INHIBITED ChargingVoltage() ChargingCurrent() SEL = GND CURRENT DAC CODE SEL = GND SW REG ON? SEL = GND CURRENT_OR SEL = OPEN CURRENT DAC CODE SEL = OPEN SW REG ON? SEL = OPEN CURRENT_OR SEL = VL CURRENT DAC CODE SEL = VL SW REG ON? SEL = VL CURRENT_OR Table 6.
PAGE 23
Chemistry-Independent, Level 2 Smart Battery Charger MAX1667 Table 8. ChargerStatus() Bit Descriptions NAME BIT POSITION LATCHED? CHARGE_INHIBITED 0 Yes 0 = Ready to charge a smart battery 1 = Charger is off; IOUT current = 0mA; DLO = PGND; DHI = LX MASTER_MODE 1 N/A Always returns ‘0’ VOLTAGE_NOTREG 2 No 0 = BATT voltage is limited at the voltage set point (BATT = V0). 1 = BATT voltage is less than the voltage set point (BATT < V0).
PAGE 24
MAX1667 Chemistry-Independent, Level 2 Smart Battery Charger HIGH-CURRENT PATH SENSE RESISTOR MAX1667 Figure 12. Kelvin Connections for the Current-Sense Resistors PC Board Layout Considerations Good PC board layout is required to achieve specified noise, efficiency, and stable performance. The PC board layout artist must be given explicit instructions, preferably a pencil sketch showing the placement of power-switching components and high-current routing.
PAGE 25
Chemistry-Independent, Level 2 Smart Battery Charger 8) The single count current-sense voltage has been changed to 5mV. R1 required is now 40mΩ. 9) After the AlarmWarning() message, the charger is not locked off. Subsequent ChargingVoltage() or ChargingCurrent() commands allow the MAX1667 to resume the charge. 10) The Alert-Response address is 0x13 (0b00010011).
PAGE 26
Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) 2 SSOP.EPS MAX1667 Chemistry-Independent, Level 2 Smart Battery Charger 1 INCHES E H MILLIMETERS DIM MIN MAX MIN MAX A 0.068 0.078 1.73 1.99 A1 0.002 0.008 0.05 0.21 B 0.010 0.015 0.25 0.38 C 0.20 0.09 0.004 0.008 SEE VARIATIONS D E e 0.205 0.212 0.0256 BSC 5.