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| 型号： | MAX8922LETB+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/15页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY CHARGER SGL 10TDFN |
| 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： | 0 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-TDFN EP（3x2） |
| 包装： | 带卷 (TR) |
30V Li+ Linear Battery Charger
with GSM Test Mode in 3mm x 2mm TDFN
DC
HIGH IMPEDANCE
POK
PULL LOW
> 4ms
1
2
3
EN
t HIGH
NO TIME LIMIT
t LOW
> 4ms
SETI MODE (1 PULSE + > 4ms LOW)
t SOFTSTART
90mA MODE (2 PULSES + > 4ms LOW)
400mA SETTING (DEFAULT)
I FAST
Figure 3. Charge-Current Programming
GSM TEST MODE
(3 PULSES + > 4ms LOW)
OFF
LDO Output
The LDO is preset to an output voltage of 4.94V and a
100mA current limit (typ). The LDO is powered from IN
and has input overvoltage protection. The LDO is on if a
valid input is present (V UVLO < V IN < V OVP ).
Bypass LDO to GND with a 1μF or larger ceramic
capacitor. The LDO can be used to supply low-voltage-
rated USB systems.
Applications Information
Fast-Charge Current Settings
In pulse 1 mode, the maximum charging current is pro-
grammed by an external resistor connected from SETI
to GND (R SETI ). Calculate R SETI as follows:
R SETI = 1500V/I FAST-CHARGE
where I FAST-CHARGE is in amperes and R SETI is in
ohms. SETI can be used to monitor the fast-charge cur-
rent level in the one-pulse mode (R SETI mode). The out-
put current from SETI is 1000μA per ampere of
charging current.
The output voltage at SETI is proportional to the charg-
ing current (I CHARGE ) when SETI mode is used for the
fast-charge current:
V SETI = I CHARGE x R SETI /1000
The voltage at ISET is nominally 1.5V at the selected
fast-charge current and decreases with charging cur-
rent as the cell becomes fully charged or as the ther-
mal-regulation circuitry activates.
Top-Off Current Settings
The top-off charging current is programmed by an
external resistor connected from MIN to GND (R MIN ) in
the one-pulse mode (R SETI mode). Calculate R MIN as
follows:
R MIN = 150V/I MIN
where I MIN is in amperes and R MIN is in ohms.
Capacitor Selection
Connect a 2.2μF ceramic capacitor from BAT to GND
for proper stability. Connect a 1μF ceramic capacitor
from IN to GND. Use a larger input bypass capacitor for
high charging currents to reduce supply noise. All
capacitors should be X5R dielectric or better. Be aware
that some capacitors have large-voltage coefficients,
and should be avoided.
_______________________________________________________________________________________
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