Datasheet
MAX1667
Chemistry-Independent,
Level 2 Smart Battery Charger
16 ______________________________________________________________________________________
Table 2a. Component Selection
_____________________Digital Section
SMBus Interface
The MAX1667 uses serial data to control its operation. The
serial interface complies with the SMBus specification (see
System Management Bus Specification, from the SBS
forum at www.sbs-Forum.org or from Intel Architecture
Labs: 800-253-3696). Charger functionality complies with
the Duracell/Intel Smart Charger Specification for a Level 2
charger.
The MAX1667 uses the SMBus Read-Word and Write-
Word protocols to communicate with the battery it is
charging, as well as with any host system that monitors
the battery to charger communications. The MAX1667
acts only as a slave device and never initiates communi-
cation on the bus; it receives commands and responds
to queries for status information. Figures 8a and 8b show
the SMBus Write-Word and Read-Word protocols.
Each communication with the MAX1667 begins with the
master issuing a START condition, which is a high-to-
low transition on SDA while SCL is high (Figure 1).
DESIGNATION MANUFACTURER
M2
Low-Side MOSFET
C8
R1
Sense Resistor
40mΩ ±1%, 1W
2N7002 equivalent
D2, D3 Central
Sprague 594D686X0025R2T
C1
Output Capacitor
TPSE686M020R0150
68µF, 20V, low ESR
IRF7805
M1
High-Side MOSFET
IR IRF7603 IRF7201
R5, R6 33Ω ±5%, 1/16W
R3 10kΩ ±1%, 1/16W
R2, R4 10kΩ ±5%, 1/16W
4A1A 3A
C4, C5, C9, C10 1µF
C2, C7, C11
C3 47nF
0.1µF
C6
Input Capacitor
Sprague 594D226X0035R2T
TPSE226M035R0200
2 x 22µF, 35V, low ESR
D1, D4, D5
Schottky Diodes
Central CMSH3-40 CMSH5-40
MBRS130LT3 MBRS340T3
1N5819 equivalent 1N5821 equivalent
MBRS340T3
1N5821 equivalent
AVX
AVX
Motorola
Motorola MMBF1170LT1
L1
Inductor
33µH, 1A I
SAT
33µH, 3A I
SAT, 30V
33µH, 4A I
SAT, 30V
Sumida CDH74-330 CDRH127-330 CDRH127-270
Coiltronics UP1B-330 UP3B-330
Coilcraft DS3316P-333
FDS6680Fairchild FDN359A FDS4410
Motorola MTSF3N03HD MMDF3N03HD
IRC LR251201R040F
Dale WSL-2512/0.04W/±1%
22nF
Schottky diode, 50mA I
DC
, 30V, CMPSH-3
NIEC EC31 NSQ03A04 CMSH5-40