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| 型号： | MAX4211FEUE+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 22/32页 |
| 文件大小： | 0K |
| 描述： | IC MONITR PWR/CURR HSIDE 16TSSOP |
| 标准包装： | 2,500 |
| 功能： | 电流监控器 |
| 检测方法： | 高端 |
| 精确度： | ±0.5% |
| 输入电压： | 4 V ~ 28 V |
| 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) |
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High-Side Power and
Current Monitors
Applications Information
Recommended Component Values
Ideally, the maximum load current develops the full-
scale sense voltage across the current-sense resistor.
Choose the gain version needed to yield the maximum
current-sense amplifier output voltage without saturat-
ing it. The typical high-side saturation voltage is about
V CC - 0.25V. The current-sense amplifier output voltage
is given by:
V IOUT = V SENSE x A VIOUT
where V IOUT is the voltage fed to the analog multiplier
or at IOUT. V SENSE is the sense voltage. A VIOUT is the
current-sense amplifier gain of the device specified in
Table 1. Calculate the maximum value for R SENSE so
the differential voltage across RS+ and RS- does not
exceed the full-scale sense voltage:
when the current is inside the current window and low
when the current is outside the window. Note that
COUT1 and COUT2 are wire-ORed together.
Overpower Circuit Breaker
Figure 2 shows a circuit breaker that shuts off current to
the load when an overpower fault is detected (the same
circuit can be used to detect overcurrent conditions by
connecting the R1-R2 resistor-divider to IOUT, instead
of POUT). This circuit is useful for protecting the battery
from short-circuit or overpower conditions. When a
power fault is detected, the P-MOSFET, M1, is turned
off and stays off until the manual reset button is
pressed. Also, cycling the input power causes the LE
pin to go low, which unlatches the comparator output
OUT1 and resets the circuit breaker.
During power-up or when the characteristics of the load
change, there can be an inrush current into the load. The
temporary inrush current results in a higher voltage at
R SENSE =
V SENSE ( FULL ? SCALE )
I LOAD ( FULL ? SCALE )
POUT. This can bring the voltage at CIN+ above the ref-
erence voltage at CIN-, and, as a result, COUT1 goes
high triggering the circuit-breaker function. This unwanted
behavior can be disabled by bringing comparator 1 ’ s
INHIBIT input high. An RC network connected to INHIBIT
t INHIBIT = R 4 × C 1 In ?
? ? V ?
? 0 . 6 V ?
Choose the highest value resistance possible to maxi-
mize V SENSE and thus minimize total output error. In
applications monitoring high current, ensure that
R SENSE is able to dissipate its own I 2 R power dissipa-
tion. If the resistor ’ s power dissipation is exceeded, its
value can drift or it can fail altogether, causing a differ-
ential voltage across the terminals in excess of the
absolute maximum ratings. Use resistors specified for
current-sensing applications.
Window Comparator
In some applications where undercurrent or underpow-
er (open-circuit fault) and overcurrent or overpower
(short-circuit fault) needs to be monitored, a window
comparator is desirable. Figure 1 shows a simple circuit
suitable for window detection. Let P OVER be the mini-
mum load power required to cause a low state at
COUT2, and let P UNDER be the maximum load current
required to cause a high state at COUT1:
(R4 and C1) can be incorporated to suspend comparator
1 ’ s operation for a brief period. In this way, short surges in
load power can be made invisible to the circuit-breaker
function, while longer term overpower load demands (or a
load short circuit) still “ trip the breaker. ”
The logic-high threshold for INHIBIT is typically 1.2V,
and the logic-low threshold is 0.6V. During power-up,
INHIBIT quickly exceeds 1.2V through C1 and inhibits
COUT1 from changing state. The comparator inputs are
“ inhibited ” until the INHIBIT voltage is discharged to
0.6V. R3 is a current-limiting resistor, typically 10k ? ,
which protects the INHIBIT input. Since INHIBIT is a
high-impedance input, R3 has no effect on the R4-C1
charge/discharge time. The time during which the com-
parator is suspended is approximated by:
?
A VPOUT × R SENSE ? ?
?
?
A VPOUT SENSE ? ?
× R
?
?
P UNDER ( WATTS ) =
P OVER ( WATTS ) =
V REF ? R 1 + R 2 ?
R 2
V REF ? R 4 + R 5 ?
R 5
where ? V is the voltage change at the load. For
improved transient immunity, t INHIBIT can be increased
as required, with the understanding that the breaker
function will be suspended for this period.
If any comparator is not used, its input must be biased
to a known state. For example, connect CIN+ to V CC
where A VPOUT is the power-sense amplifier gain given
in Table 2, and V REF is the internal reference voltage
(1.2V, typ). The resulting comparator output is high
and CIN- to GND.
22
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