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MAX1926 Datasheet(PDF) 10 Page - Maxim Integrated Products

Part # MAX1926
Description  Switch-Mode 1-Cell Li Chargers
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX1926 Datasheet(HTML) 10 Page - Maxim Integrated Products

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Detailed Description
The MAX1925/MAX1926 switch-mode battery chargers
form a complete solution for a single-cell Li+ battery. The
devices include battery undervoltage/overvoltage fault
protection. The MAX1925/MAX1926 use EN and THRM
for shutdown, battery detection, and temperature monitor-
ing. The devices provide outputs to indicate charge sta-
tus (CHG) and presence of input power (ACON).
The MAX1925/MAX1926 include two prequalification
modes that must be passed before the charger enters
the fast-charge state. During fast charge, the charger
operates initially in constant-current mode until the bat-
tery voltage reaches 4.2V. When the battery voltage
has reached 4.2V, the charger operates in constant-
voltage mode. In constant-current mode, the charger
acts as a hysteretic current source, controlling the
inductor’s peak and valley currents. In constant-voltage
mode, the charger regulates the peak and valley of the
output ripple.
Charge Cycle
The MAX1925/MAX1926 initiate PREQUAL when one of
the following occurs:
• When an external power source is connected
• The cell voltage falls to 4V after charging is finished
• EB is toggled
• Input power is cycled
Some Li+ cells can be damaged when fast-charged
from a completely dead state. Moreover, an over-dis-
charged cell may indicate a dangerous abnormal cell
condition. As a built-in safety feature, the MAX1925/
MAX1926 use a two-level prequalification charge to
determine if it is safe to charge. When the cell voltage is
less than 2V, the cell is charged from an internal
Switch-Mode 1-Cell Li+ Chargers
10
______________________________________________________________________________________
RESET
(ACON IS LOW)
OFF
(ACON HIGH Z)
SHDN
(ACON HIGH Z)
ANY STATE
(INCLUDING FAULT)
EN HIGH AND
IN WITHIN ACON
WINDOW*
EN LOW OR
IN OUTSIDE ACON
WINDOW*
VBATT > 2V
(DEBOUNCED)
VBATT > 3V
(DEBOUNCED)
FULL TOPOFF
(CHG LED OFF)
DONE
(CHG LED OFF)
KELVIN
(CHG LED OFF)
F_PQ1
F_VB
tPREQUAL1 TIMES OUT
BEFORE VBATT > 2V
F_PQ2
F_FULL
tPREQUAL2 TIMES OUT
BEFORE VBATT > 3V
tFULLCHG TIMES OUT
BEFORE ENTERING
FULL TOP-OFF
STATE
10-SECOND
TIMER
FULL-CHARGE
TIMER TIMES OUT
VBATT < 4.2V
*SEE TABLE 2 FOR ACON WINDOW
FOR MAX1925/MAX1926
VBATT > 4.35V
AND IN WITHIN ACON
WINDOW*
AND EN HIGH
VIN WITHIN ACON
WINDOW*
VIN < VBATT
VIN > VBATT
VIN < VBATT
VIN > VBATT AND VIN
OUTSIDE ACON WINDOW*
AUTOMATIC RESTART
BATT DROPS TO 4V
VBATT > 4.2V
F-TEMP
TEMP
IN RANGE
TEMP OUT
OF RANGE
VIN OUTSIDE ACON WINDOW*
PREQUAL1
(ICHG = 4mA)
(CHG LED ON)
PREQUAL2
(ICHG = C/10)
(CHG LED ON)
FASTCHG
(ICHG = C)
(CHG LED ON)
ICHG < C/8
(DEBOUNCED)
FAULT
(CHG LED BLINK AT 0.5Hz)
(EXT HIGH FET OFF)
Figure 2. MAX1925/MAX1926 State Diagram


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