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| 型号： | MAX1737EEI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/18页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR BAT CHARGE 28-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 6 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 28-QSOP |
| 包装： | 带卷 (TR) |
MAX1737
Stand-Alone Switch-Mode
Lithium-Ion Battery-Charger Controller
The current-mode PWM controller uses the inductor
current to regulate the output voltage or current, simpli-
fying stabilization of the regulation loops. Separate
compensation of the regulation circuits allows each to
be optimally stabilized. Internal slope compensation is
included, ensuring stable operation over a wide range
of duty cycles.
The controller drives an external N-channel MOSFET
switch and a synchronous rectifier to step the input
voltage down to the battery voltage. A bootstrap
capacitor drives the high-side MOSFET gate to a volt-
age higher than the input source voltage. This capaci-
tor (between BST and LX) is charged through a diode
from VLO when the synchronous rectifier is on. The
high-side MOSFET gate is driven from BST, supplying
sufficient voltage to fully drive the MOSFET gate even
when its source is near the input voltage. The synchro-
nous rectifier is driven from DLO to behave like a diode,
but with a smaller voltage drop for improved efficiency.
A built-in dead time (50ns typ) between switch and syn-
chronous rectifier turn-on and turn-off prevents crowbar
currents (currents that flow from the input voltage to
ground due to both the MOSFET switch and synchro-
nous rectifier being on simultaneously). This dead time
may allow the body diode of the synchronous rectifier
to conduct. If this happens, the resulting forward volt-
age and diode recovery time will cause a small loss of
efficiency and increased power dissipation in the syn-
chronous rectifier. To prevent the body diode from con-
ducting, place an optional Schottky rectifier in parallel
with the drain and source of the synchronous rectifier.
The internal current-sense circuit turns off the synchro-
nous rectifier when the inductor current drops to zero.
Timers
The MAX1737 includes safety timers to terminate
charging and to ensure that faulty batteries are not
charged indefinitely. TIMER1 and TIMER2 set the time-
out periods.
TIMER1 controls the maximum prequalification time,
maximum full-charge time, and the top-off time. TIMER2
controls the maximum fast-charge time. The timers are
cycle (approximately 85% charge) and is operating in
voltage mode. The FASTCHG and FULLCHG outputs
can be tied together to indicate charging (see Figure 2).
FAULT indicates the charger has detected a charging
fault and that charging has terminated. The charger can
be brought out of the FAULT condition by removing and
reapplying the input power, or by pulling SHDN low.
Thermistor
The intent of THM is to inhibit fast-charging the cell
when it is too cold or too hot (+2.5°C ≤ T OK ≤ +47.5°C),
using an external thermistor. THM time multiplexes two
sense currents to test for both hot and cold qualification.
The thermistor should be 10k Ω at +25°C and have a
negative temperature coefficient (NTC); the THM pin
expects 3.97k Ω at +47.5°C and 28.7k Ω at +2.5°C.
Connect the thermistor between THM and GND. If no
temperature qualification is desired, replace the ther-
mistor with a 10k Ω resistor. Thermistors by
Philips/BCcomponents (2322-640-63103), Cornerstone
Sensors (T101D103-CA), and Fenwal Electronics (140-
103LAG-RB1) work well.
Shutdown
When SHDN is pulled low, the MAX1737 enters the
shutdown mode and charging is stopped. In shutdown,
the internal resistive voltage-divider is removed from
BATT to reduce the current drain on the battery to less
than 1μA. DHI and DLO are low. However, the internal
linear regulator (VLO) and the reference (REF) remain
on. The status outputs FASTCHG , FULLCHG , and
FAULT are high impedance. When exiting shutdown
mode, the MAX1737 goes back to the power-on reset
state, which resets the timers and begins a new charge
cycle.
Source Undervoltage Shutdown
(Dropout)
If the voltage on DCIN drops within 100mV of the volt-
age on BATT, the charger resets.
Table 2. Cell-Count Programming
set by external capacitors. The typical times of 7.5 min-
utes for prequalification, 90 minutes for full charge, 45
minutes for top-off, and 90 minutes for fast charge are
set by using a 1nF capacitor on TIMER1 and TIMER2
(Figure 1). The timers cannot be disabled.
Charge Monitoring Outputs
FASTCHG , FULLCHG , and FAULT are open-drain out-
puts that can be used as LED drivers. FASTCHG indi-
cates the battery is being fast charged. FULLCHG
indicates the charger has completed the fast-charge
14
CELL
GND
Float
REF
VL
CELL COUNT (N)
1
2
3
4
Maxim Integrated
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