MAX1667EAP+T Maxim Integrated Products, MAX1667EAP+T Datasheet - Page 11

• Manufacturer Part Number: MAX1667EAP+T
• Description: IC SMART BATT CHGR LEVEL2 20SSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX1667EAP+T

• Function: Charge Management
• Battery Type: All Battery Types
• Voltage - Supply: 7.5 V ~ 28 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Note:
sion 0.95a specification. While they can correctly interpret
smart battery end-of-charge messages minimizing over-
charge, they do not provide truly chemistry-independent
charging. They are no longer defined by the Smart Battery
Charger specification and are explicitly not compliant with this
and subsequent Smart Battery Charger specifications.
The Level 2 or “smart-battery-controlled” smart battery
charger interprets the smart battery’s critical warning
Figure 4. Typical Multiple Smart Battery System
Table 1. Charger Type by SMBus Mode
and Charge Algorithm Source
Slave Only
Slave/Master
SMBus MODE
Level 1 smart battery chargers are defined in the ver-
Level 2 Smart Battery Charger
SYSTEM HOST
(SMBus HOST)
______________________________________________________________________________________
CHARGE ALGORITHM SOURCE
Battery
Level 2
Level 3
+12V, -12V
V
BATTERY DATA/STATUS REQUESTS
CC
CRITICAL EVENTS
SYSTEM
POWER
SUPPLY
SMART BATTERY
Modified from Battery
SMART BATTERY 1
SELECTOR
Level 3
Level 3
Level 2 Smart Battery Charger
DC (UNREGULATED) / V
BATTERY
Chemistry-Independent,
messages, and operates as an SMBus slave device
that responds to ChargingVoltage() and Charging-
Current() messages sent to it by a smart battery. The
charger is obliged to adjust its output characteristics in
direct response to the messages it receives from the
battery. In Level 2 charging, the smart battery is com-
pletely responsible for initiating communication and for
providing the charging algorithm to the charger. The
smart battery is in the best position to tell the smart bat-
tery charger how it needs to be charged. The charging
algorithm in the battery may request a static charge
condition or may choose to periodically adjust the
smart battery charger’s output to meet its present
needs. A Level 2 smart battery charger is truly chem-
istry independent, and since it is defined as an SMBus
slave device only, it is relatively inexpensive and easy
to implement.
SMBus
SMART BATTERY 2
NOTE: SB 1 POWERING SYSTEM
SB 2 CHARGING
SAFETY SIGNAL
V
SMBus
CHARGE
(UNREGULATED)
SMART BATTERY
CONVERTER
MAX1667
CHARGER
AC-DC
AC
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