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参数资料
| 型号： | MAX1737EEI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/18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
V DCIN < BATT
V BATT < UNDERVOLTAGE
THRESHOLD
V DCIN > V BATT
RESET
FASTCHG = HIGH
FULLCHG = HIGH
FAULT = HIGH
SHUTDOWN
FASTCHG = HIGH
FULLCHG = HIGH
FAULT = HIGH
SHDN HIGH
SHUTDOWN IS
ENTERED FROM ALL STATES
WHEN SHDN IS LOW.
PREQUAL
FASTCHG = LOW
PREQUAL
TIMEOUT
FAULT
FASTCHG = HIGH
FULLCHG = HIGH
FAULT = HIGH
TEMP
V BATT > 2.5V
FULLCHG = HIGH
FAULT = LOW
FAST-CHARGE
TIMEOUT
NOT OK
TEMP
OK
FAST CHARGE
FASTCHG = LOW
FULLCHG = HIGH
V BATT < 0.95 × V BATTR
ONCE PER
SECOND
TEMP
OK
FAULT = HIGH
V BATT = BATTERY
REGULATION VOLTAGE (V BATTR )
ONCE PER
SECOND
FULL CHARGE
TEMP
NOT OK
TEMP
QUAL
TEMP
OK
TEMP
OK
TEMP
NOT OK
FASTCHG = HIGH
FULLCHG = LOW
FAULT = HIGH
I CHARGE < I MIN OR
FULL-CHARGE
TIMEOUT
TOP-OFF
DONE
V BATT < 0.95 × V BATTR
FASTCHG = HIGH
FASTCHG = HIGH
Figure 4. State Diagram
FULLCHG = HIGH
FAULT = HIGH
TOP-OFF
TIMEOUT
FULLCHG = HIGH
FAULT = HIGH
current regulation, the input source must be able to
supply the maximum system current plus the maximum
charger input current. By using the input current limiter,
the current capability of the AC wall adapter may be
lowered, reducing system cost.
Input current is measured through an external sense
resistor at CSSP and CSSN. The voltage at ISETIN also
adjusts the input current limit. Full-scale input current is
achieved when ISETIN is connected to REF, setting the
full-scale current-sense voltage to 100mV.
When choosing the input current-sense resistor, note
that the voltage drop across this resistor adds to the
power loss, reducing efficiency. Reducing the voltage
12
across the current-sense resistor may degrade input
current limit accuracy due to the input offset of the
input current-sense amplifier.
The input current error amplifier (GMS) is compensated
at CCS. A 47nF capacitor at CCS provides suitable per-
formance for most applications.
PWM Controller
The PWM controller drives the external MOSFETs to
control the charging current or voltage. The input to the
PWM controller is the lowest of CCI, CCV, or CCS. An
internal clamp limits the noncontrolling signals to within
200mV of the controlling signal to prevent delay when
switching between regulation loops.
Maxim Integrated
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