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MAX1666SEEE Datasheet(PDF) 10 Page - Maxim Integrated Products

Part # MAX1666SEEE
Description  Advanced Lithium-Ion Battery-Pack Protector
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX1666SEEE Datasheet(HTML) 10 Page - Maxim Integrated Products

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Advanced Lithium-Ion
Battery-Pack Protector
10
______________________________________________________________________________________
Detailed Description
The MAX1666 battery-pack protectors supervise the
charging and discharging processes of Lithium-Ion
battery cells. Designed for 2, 3, and 4-cell applications,
these devices monitor the voltage across each cell to
provide protection against undervoltage, overvoltage,
and overcurrent damage.
Control pins CGO, TKO, and DSO allow control of
external MOSFET gates. This allows fast charging,
trickle charging, and discharging processes (see
Typical Operating Circuit). The voltage of each cell is
measured individually. Also, each cell is measured dif-
ferentially between every other cell of the pack.
The MAX1666 contains a state machine, a voltage reg-
ulator, an oscillator, and other logic functions to selec-
tively drive CGO, UVO, TKO, DSO, WRN, and PKF
(Figure 1).
Modes of Operation
Shutdown Mode
The MAX1666 goes into shutdown mode when a bat-
tery pack is first connected. The quiescent current is
less than 1µA. All circuitry is inactive except the com-
parator monitoring VSRC and the top-cell voltage. The
MAX1666 remains in shutdown mode as long as VSRC
is less than the top-cell voltage. When SRC is connect-
ed to an external charger and VSRC is 1V above the
top-cell voltage, the device goes into standby mode.
The MAX1666 returns to shutdown mode under two
conditions: the battery is disconnected and then re-
connected, or the device detects an undervoltage fault
and no charge source.
Normal Mode
The standby state activates the bias circuitry, overcur-
rent comparator, and timer. The standby state lasts
80ms, then the MAX1666 goes into the sample state for
2.5ms.
Within the 2.5ms, the MAX1666 checks for overvoltage,
undervoltage, and mismatch between cells sequential-
ly, and it stores the results in internal latches. The
MAX1666 drives the outputs according to the faults (if
any) detected by reading the latches (Figure 2) at the
end of the sample state. Then the MAX1666 returns to
the standby state.
Overvoltage Protection
The MAX1666 provides overvoltage protection to avoid
overcharging of any cell. When any cell is at overvolt-
age, CGO and TKO go high, turning off the external MOS-
FETs and stopping the charging process (
Typical
Operating Circuits). WRN goes low. Overvoltage is set
when any cell voltage exceeds the overvoltage thresh-
old.
Overvoltage threshold is linearly adjustable through an
external 1% resistor-divider (Figure 3) from REF.
Determine the overvoltage threshold (VOVT) required.
VOVT must be between 4V and 4.4V. Set RTOTAL = R1
+ R2 = 1M
Ω. Calculate R1 and R2 as follows:
R2 = [(VOVT - 4V) / (4.4V- 4V)] · RTOTAL
R1 = RTOTAL - R2
MODE
TIME
TYPICAL
QUIESCENT
CURRENT (µA)
CONDITION
80ms
24
Only bias circuitry, overcurrent comparator, and timer are active.
Normal
2.5ms
250
All circuitry active.
Shutdown
0.7
All circuitry inactive. Device enters shutdown when it detects an undervolt-
age fault and VSRC < VTOP-CELL + 1V (no charge source).
Table 1. Operating Modes
R1
R3
REF
OVA
R5
R2
R4
R6
UVA
MMA
GND
MAX1666
Figure 3. Using an External Resistor-Divider to Adjust
Overvoltage Threshold
STATE
Standby
Sample


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