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参数资料
| 型号： | MAX6399ATA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/18页 |
| 文件大小： | 0K |
| 描述： | IC SW OVERVOLT PROT 8-TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 电压 - 工作： | 72V |
| 技术： | 混合技术 |
| 功率（瓦特）： | 1.45W |
| 电路数： | 1 |
| 应用： | 通用 |
| 封装/外壳： | 8-WDFN 裸露焊盘 |
| 供应商设备封装： | 8-TDFN-EP（3x3） |
| 包装： | 带卷 (TR) |
Overvoltage Protection Switch/Limiter
Controllers Operate Up to 72V
V BATT
1k ?
IN
GATE
V BATT
C GATE
C OUT
LOAD
IN
GATE
MAX6397
MAX6398
OUT
60V
TVS
MAX6397
MAX6398
LOAD
GND
OUT
GND
Figure 8. MAX6397/MAX6398 Controlling GATE Inrush Current
REG Capacitor Selection for Stability
For stable operation over the full temperature range and
with load currents up to 100mA, use ceramic capacitor
values greater than 4.7μF. Large output capacitors help
reduce noise, improve load-transient response, and
power-supply rejection at REG. Note that some ceramic
dielectrics exhibit large capacitance and ESR variation
with temperature. At lower temperatures, it may be nec-
essary to increase capacitance.
Under normal conditions, use a 10μF capacitor at IN.
Larger input capacitor values and lower ESR provide bet-
ter supply-noise rejection and line-transient response.
Inrush/Slew-Rate Control
Inrush current control can be implemented by placing a
capacitor at GATE (Figure 8) to slowly ramp up the
GATE, thus limiting the inrush current and controlling
GATE’s slew rate during initial turn-on. The inrush cur-
rent can be approximated using the following formula:
Figure 9. Protecting the MAX6397/MAX6398 Input from High-
Voltage Transients
where I GATE is GATE’s 75μA sourcing current, I LOAD is
the load current at startup, and C OUT is the output
capacitor.
Input Transients Clamping
When the external MOSFET is turned off during an over-
voltage occurrence, stray inductance in the power path
may cause voltage ringing exceeding the MAX6397/
MAX6398 absolute maximum input (IN) supply rating.
The following techniques are recommended to reduce
the effect of transients:
? Minimize stray inductance in the power path using
wide traces, and minimize loop area including the
power traces and the return ground path.
? Add a zener diode or transient voltage suppressor
(TVS) rated below the IN absolute maximum rating
(Figure 9).
Add a resistor in series with IN to limit transient current
going into the input for the MAX6398 only.
I INRUSH =
C OUT
C GATE
× I GATE + I LOAD
12
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