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| 型号： | MAX1541ETL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 31/49页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR DIVIDER PWM 40-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 620kHz |
| 占空比： | 100% |
| 电源电压： | 2 V ~ 28 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 是 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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Dual Step-Down Controllers with Saturation
Protection, Dynamic Output, and Linear Regulator
cannot tolerate a negative voltage, place a power
Schottky diode across the output to act as a reverse-
polarity clamp. If the condition that caused the overvolt-
age persists (such as a shorted high-side MOSFET),
the input fuse blows. The MAX1541 ignores OVP faults
on OUT1 when it detects a transition on GATE
(FBLANK enabled). Toggle ON1 or ON2, or cycle V CC
power below 1V to clear the fault latch and restart the
controller.
OVP is disabled when OVP/UVP is connected to REF or
GND (Table 7).
Undervoltage Protection (UVP)
When the output voltage drops below 70% of the nomi-
nal regulation voltage and UVP is enabled (OVP/UVP =
V CC or REF), the controller sets the fault latch and acti-
vates the output discharge sequence (see the
Shutdown and Output Discharge (ON_) section) of both
outputs. When the output voltage drops to 0.3V, the dri-
ver pulls DL high so the synchronous rectifier turns on,
clamping the output to GND. UVP is ignored for at least
10ms (min) after startup (ON_ rising edge), and when
transitions are detected on GATE (MAX1541 only,
FBLANK enabled). Toggle ON1 or ON2, or cycle V CC
power below 1V to clear the fault latch and restart the
controller.
UVP is disabled when OVP/UVP is left open or connect-
ed to GND (Table 7).
Thermal Fault Protection
The MAX1540A/MAX1541 feature a thermal fault-pro-
tection circuit. When the linear regulator is disabled
(LDOON = GND), the controller sets the thermal limit at
+160 ° C. When the linear regulator is enabled (LDOON
= V CC ), the controller sets the thermal limit at +150 ° C to
protect the internal linear regulator from continuous
short-circuit conditions. Once the junction temperature
exceeds the thermal limit, the thermal-protection circuit
activates the fault latch, pulls PGOOD1 and PGOOD2
low, disables the linear regulator, and activates the out-
put discharge sequence of both outputs regardless of
the OVP/UVP setting. Toggle ON1 or ON2, or cycle V CC
power below 1V to reactivate the controller after the
junction temperature cools by 10 ° C.
Output Voltage
Preset Output Voltages
The MAX1540A/MAX1541s ’ Dual Mode operation
allows the selection of common voltages without requir-
ing external components (Figure 10). For the main con-
troller (OUT1) of the MAX1540A, connect FB1 to GND
for a fixed 1.8V output, to V CC for a fixed 1.2V output, or
connect FB1 directly to OUT1 for a fixed 0.7V output.
For the secondary controller (OUT2) of the MAX1540A,
connect FB2 to GND for a fixed 2.5V output, to V CC for
a fixed 1.5V output, or connect FB2 directly to OUT2 for
a fixed 0.7V output. The main controller (OUT1) of the
MAX1541 regulates to the voltage set at REFIN1 (V FB1
= V REFIN1 ) and does not support Dual Mode operation.
For the secondary controller (OUT2) of the MAX1541,
connect FB2 to GND for a fixed 2.5V output, to V CC for
a fixed 1.8V output, or connect FB2 directly to OUT2 for
a fixed 0.7V output. Table 8 shows the output voltage
configuration.
Table 7. Fault Protection and Shutdown Setting Truth Table
OVP/UVP
ON_ DISCHARGE*
UVP PROTECTION
OVP PROTECTION
THERMAL PROTECTION
Yes. Output discharged
V CC
through a 10 Ω resistor,
and DL forced high when
Yes. UVP fault activates Yes. DH pulled low and DL
the discharge sequence. forced high immediately.
Yes. Thermal fault activates
the discharge sequence.
output drops below 0.3V.
Yes. Output discharged
Open
through a 10 Ω resistor,
and DL forced high when
No. UVP disabled.
Yes. DH pulled low and DL
forced high immediately.
Yes. Thermal fault activates
the discharge sequence.
output drops below 0.3V.
REF
GND
No. DL forced low when
shut down.
No. DL forced low when
shut down.
Yes. UVP fault activates
the discharge sequence.
No. UVP disabled.
No. OVP disabled.
No. OVP disabled.
Yes. Thermal fault activates
the discharge sequence.
Yes. Thermal fault activates
the discharge sequence.
* Discharge-mode state latched on power-up.
______________________________________________________________________________________
31
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