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參數(shù)資料
| 型號： | MAX1737EVKIT |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | MAX1737 Evaluation Kit |
| 中文描述： | MAX1737評估板 |
| 文件頁數(shù)： | 10/18頁 |
| 文件大小： | 234K |
| 代理商： | MAX1737EVKIT |
M
Stand-Alone Switch-Mode
Lithium-Ion Battery-Charger Controller
10
______________________________________________________________________________________
accuracy is better than 1% while using 1% setting
resistors.
The MAX1737 includes a state machine that controls
the charging algorithm. Figure 4 shows the state dia-
gram. Table 1 lists the charging state conditions. When
power is applied or
SHDN
is driven high, the part goes
into the reset state where the timers are reset to zero to
prepare for charging. From the reset state, it enters the
prequalification state. In this state, 1/20 of the fast-
charge current charges the battery, and the battery
temperature and voltage are measured. If the voltage is
above the undervoltage threshold and the temperature
is within the limits, then it will enter the fast-charge
state. If the battery voltage does not rise above the
undervoltage threshold before the prequalification timer
expires, the charging terminates and the
FAULT
output
goes low. The prequalification time is set by the
TIMER1 capacitor (C
TIMER1
). If the battery is outside
the temperature limits, charging and the timer are sus-
pended. Once the temperature is back within limits,
charging and the timer resume.
In the fast-charge state, the
FASTCHG
output goes low,
and the batteries charge with a constant current (see
the
Charging Current Regulator
section). If the battery
voltage reaches the voltage limit before the fast timer
expires, the part enters the full-charge state. If the fast-
charge timer expires before the voltage limit is
reached, charging terminates with a fault indication.
The fast-charge time limit is set by the TIMER2 capaci-
tor (C
TIMER2
). If the battery temperature is outside the
limits, charging pauses and the timers are suspended
until the temperature returns to within the limits.
In the full-charge state, the
FULLCHG
output goes low
and the batteries charge at a constant voltage (see the
Voltage Regulator
section). When the charging current
drops below 10% of the charging current limit, or if the
full-charge timer expires, the state machine enters the
top-off state. In the top-off state, the batteries continue
to charge at a constant voltage until the top-off timer
expires, at which time it enters the done state. In the
done state, charging stops until the battery voltage
drops below the recharge-voltage threshold. It then
enters the reset state to start the charging process
again. In the full-charge or the top-off state, if the bat-
tery temperature is outside the limits, charging pauses
and the timers are suspended until the battery temper-
ature returns to within limits.
Voltage Regulator
Li+ batteries require a high-accuracy voltage limit while
charging. The MAX1737 uses a high-accuracy voltage
regulator (±0.8%) to limit the charging voltage. The bat-
tery regulation voltage is nominally set to 4.2V per cell
and can be adjusted ±5% by setting the voltage at the
VADJ pin between reference voltage and ground. By
limiting the adjust range of the regulation voltage, an
overall voltage accuracy of better than 1% is main-
tained while using 1% resistors. CELL sets the cell
count from one to four series cells (see
Setting the
Battery Regulation Voltage
section).
An internal error amplifier (GMV) maintains voltage reg-
ulation (Figure 3). The GMV amplifier is compensated
at CCV. The component values shown in Figure 1 pro-
vide suitable performance for most applications.
Individual compensation of the voltage regulation and
current regulation loops allows for optimal compensa-
tion of each.
Charging Current Regulator
The charging current-limit regulator limits the charging
current. The current is sensed by measuring the volt-
age across the current-sense resistor (R18, Figure 1)
placed between the BATT and CS pins. The voltage on
the ISETOUT pin also controls the charging current.
Full-scale charging current is achieved by connecting
ISETOUT to REF. In this case, the full-scale current-
sense voltage is 200mV from CS to BATT.
When choosing the charging current-sense resistor,
note that the voltage drop across this resistor causes
further power loss, reducing efficiency. However,
adjusting ISETOUT to reduce the voltage across the
FAST-
STATE
LOW
DRAIN
LOW
BATTERY
CURRENT
BATTERY
FOUTPUT
FOUTPUT
FULL-
STATE
TSTATE
DONE
CHARGE I = 1C
BATTERY
INSERTION
OR SHDN HIGH
TRANSITION TO
VOLTAGE MODE
(APPROX 85% CHARGE)
FULL-CHARGE TIMER
TIMES OUT OR
BATTERY CURRENT
DROPS TO C/10
(APPROX 95% CHARGE)
TOP-OFF TIMER
TIMES OUT, END OF ALL
CHARGE FUNCTIONS
Figure 2. Charge State and Indicator Output Timing for a
Typical Charging Sequence
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| MAX1739EEP | 功能描述:顯示驅(qū)動(dòng)器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MAX1739EEP+ | 功能描述:顯示驅(qū)動(dòng)器和控制器 CCFL Backlight Controller RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MAX1739EEP+T | 功能描述:顯示驅(qū)動(dòng)器和控制器 CCFL Backlight Controller RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MAX1739EEP-T | 功能描述:顯示驅(qū)動(dòng)器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MAX1739EVKIT | 功能描述:電源管理IC開發(fā)工具 MAX1739 Eval Kit RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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