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| 型号： | MAX6639ATE+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 17/22页 |
| 文件大小： | 0K |
| 描述： | IC TEMP MONITOR 2CH 16-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 风扇控制，温度监控器 |
| 传感器类型： | 内部和外部 |
| 感应温度： | 0°C ~ 150°C，外部传感器 |
| 精确度： | ±2°C 本地（最大），±1°C 远程（最大） |
| 拓扑： | ADC，PWM 发生器，转速计计数器 |
| 输出类型： | I²C?/SMBus? |
| 输出警报： | 是 |
| 输出风扇： | 是 |
| 电源电压： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
MAX6639/MAX6639F
2-Channel Temperature Monitor with Dual,
Automatic, PWM Fan-Speed Controller
V CC
PWM1
4.7k Ω
V FAN
(12V OR 5V)
V CC
PWM1
3V TO 5.5V
4.7k Ω
3V TO 5.5V
5V
3V TO 5.5V
V FAN
(5V OR 12V)
4.7k Ω
TACH1
TACH
OUTPUT
Figure 8. High-Side PWM Drive with “Keep-Alive” Supply
V FAN
(5V OR 12V)
V CC
100k Ω
3.3V
4.7k Ω
TACH1
TACH
OUTPUT
Figure 10. 4-Wire Fan with PWM Speed-Control Input
Linear Fan Supply Drive
While many fans are compatible with PWM power-supply
drive, some are excessively noisy with this approach.
When this is the case, a good alternative is to control the
fan’s power-supply voltage with a variable DC power-sup-
ply circuit. The circuit in Figure 10 accepts the PWM sig-
nal as an input, filters the PWM, and converts it to a DC
PWM1
4.7k Ω
3V TO 5V
4.7k Ω
100k Ω
2.2 μ F
2N3904
33k Ω
9.1k Ω
10 μ F
voltage that then drives the fan. To minimize the size of
the filter capacitor, use the highest available PWM fre-
quency. Pulse stretching is not necessary when using a
linear fan supply. Note that this approach is not as effi-
cient as PWM drive, as the fan’s power-supply current
flows through the MOSFET, which can have an apprecia-
ble voltage across it. The total power is still less than
that of a fan running at full speed. Table 11 is a summa-
ry of fan-drive options.
TACH1
TACH OUTPUT
TACH
OUTPUT
4-Wire Fans
Some fans have an additional, fourth terminal that
accepts a logic-level PWM speed-control signal as
Figure 9. High-Side Linear Drive Circuit
the circuit in Figure 8 can be used to eliminate pulse
stretching while still allowing accurate tachometer feed-
back. The diode connects the fan to a low-voltage
power supply, which keeps the fan’s internal circuitry
powered even when the PWM drive is zero. Therefore,
the tachometer signal is always available and pulse
stretching can be turned off. Note that this approach
prevents the fan from turning completely off, so even
when the duty cycle is 0%, the fan may still spin.
Maxim Integrated
shown in Figure 10. These fans require no external
power circuitry and combine the low noise of linear
drive with the high efficiency of PWM power-supply
drive. Higher PWM frequencies are recommended
when using 4-wire fans.
17
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