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| 型号： | MAX800MEUE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/17页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU 16-TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 备用电池电路 |
| 监视电压数目： | 1 |
| 输出： | 开路漏极，推挽式 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.4V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 带卷 (TR) |
Microprocessor Supervisory Circuits
Battery-Backup Input
The Battery-Backup Input (VBATT) is similar to the V CC
input except the PMOS switch and parallel diode are
much smaller. Accordingly, the on-resistances of the
diode and the switch are each approximately 10 Ω .
Continuous current should be limited to 25mA and
peak currents (only during power-up) limited to 250mA.
The reverse leakage of this input is less than 1μA over
temperature and supply voltage (Figure 8).
Output Supply Voltage
The Output Supply Voltage (V OUT ) pin is internally con-
nected to the substrate of the IC and supplies current
to the external system and internal circuitry. All open-
circuit outputs will, for example, assume the V OUT volt-
age in their high states rather than the V CC voltage. At
the maximum source current of 250mA, V OUT will typi-
cally be 200mV below V CC . Decouple this terminal with
a 0.1μF capacitor.
__________Applications Information
The MAX691A/MAX693A/MAX800L/MAX800M are not
short-circuit protected. Shorting V OUT to ground, other
than power-up transients such as charging a decou-
pling capacitor, destroys the device.
All open-circuit outputs swing between V OUT and GND
rather than V CC and GND.
If long leads connect to the chip inputs, insure that
these leads are free from ringing and other conditions
that would forward bias the chip’s protection diodes.
There are three distinct modes of operation:
1) Normal operating mode with all circuitry powered
up. Typical supply current from V CC is 35μA while
only leakage currents flow from the battery.
2) Battery-backup mode where V CC is typically within
0.7V below VBATT. All circuitry is powered up
and the supply current from the battery is typically
less than 60μA.
3) Battery-backup mode where V CC is less than
VBATT by at least 0.7V. VBATT supply current is
1μA max.
Using SuperCap or MaxCap with the
MAX691A/MAX693A/MAX800L/MAX800M
VBATT has the same operating voltage range as V CC ,
and the battery switchover threshold voltages are typi-
cally ±30mV centered at VBATT, allowing use of a
SuperCap and a simple charging circuit as a backup
source (Figure 9).
If V CC is above the reset threshold and VBATT is 0.5V
above V CC , current flows to V OUT and V CC from VBATT
until the voltage at VBATT is less than 0.5V above V CC .
For example, with a SuperCap connected to VBATT and
through a diode to V CC , if V CC quickly changes from 5.4V
to 4.9V, the capacitor discharges through V OUT and V CC
until VBATT reaches 5.1V typ. Leakage current through
the SuperCap charging diode and the internal power
diode eventually discharges the SuperCap to V CC . Also, if
V CC and VBATT start from 0.1V above the reset threshold
and power is lost at V CC , the SuperCap on VBATT dis-
charges through V CC until VBATT reaches the reset
threshold; then the battery-backup mode is initiated and
the current through V CC goes to zero.
+5V
3
VBATT
1N4148
V CC
MAX691A
1
VBATT
V OUT
2
MAX693A
MAX800L
MAX800M
0.1 μ F
V OUT
0.47F*
MAX691A
MAX693A
MAX800L
V CC
Figure 8. V CC and VBATT to V OUT Switch
MAX800M
GND
4
* MaxCap
Figure 9. SuperCap or MaxCap on VBATT
12
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