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参数资料
| 型号： | MAX17101ETJ+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 23/31页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR DIV PWM CM 32TQFNEP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 3 |
| 频率 - 最大： | 500kHz |
| 电源电压： | 6 V ~ 24 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： | 0°C ~ 85°C |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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Dual Quick-PWM, Step-Down Controller
with Low-Power LDO, RTC Regulator
R FBH = R FBL ? OUT 1 ? 1 ?
Adjustable/Fixed Output Voltages
Connect FB1 to GND for fixed 5V operation. Connect FB1
to V CC for fixed 1.5V operation. Connect FB1 to an exter-
nal resistive voltage-divider from OUT1 to analog ground
to adjust the output voltage between 0.7V and 5.5V.
During soft-shutdown, application circuits configured for
adjustable feedback briefly switch modes when FB1
drops below the 110mV dual-mode threshold.
Choose R FBL (resistance from FB1 to AGND) to be
approximately 49.9k Ω and solve for R FBH (resistance
from OUT1 to FB1) using the following equation:
? V ?
? 0 . 7 V ?
Connect REFIN2 to V CC for fixed 3.3V operation.
Connect REFIN2 to RTC (3.3V) for fixed 1.05V operation.
Connect REFIN2 to an external resistive voltage-divider
from REF to analog ground to adjust the output voltage
between 0.8V and 2V.
Choose R REFINL (resistance from REFIN2 to GND) to
be approximately 49.9k Ω and solve for R REFINH (resis-
tance from REF to REFIN2) using the equation:
fixed-regulation voltage or within 150mV of the REFIN2
input voltage. PGOOD_ goes low if the feedback volt-
age drops 16% below the fixed target voltage, or if the
output voltage drops 150mV below the dynamic REFIN2
voltage, or if the SMPS controller is shut down. For a
logic-level PGOOD_ output voltage, connect an external
pullup resistor between PGOOD_ and V DD . A 100k Ω
pullup resistor works well in most applications.
Overvoltage Protection (OVP)
When the output voltage rises 16% above the regula-
tion voltage, the controller immediately pulls the
respective PGOOD_ low, sets the overvoltage fault
latch, and immediately pulls the respective DL_ high—
clamping the output to GND. Toggle either ON1 or ON2
input, or cycle V CC power below its POR threshold to
clear the fault latch and restart the controller.
Undervoltage Protection (UVP)
When the output voltage drops 30% below the regula-
tion voltage, the controller immediately pulls the respec-
tive PGOOD_ low, sets the undervoltage fault latch, and
begins the shutdown sequence. After the output volt-
age drops below 0.1V, the synchronous rectifier turns
R REFINH = R REFINL ?
? 1 ?
? V REF
? V OUT 2
?
?
on, clamping the output to GND. Toggle either ON1 or
ON2 input, or cycle V CC power below its POR threshold
to clear the fault latch and restart the controller.
Power-Good Outputs (PGOOD)
and Fault Protection
PGOOD is the open-drain output that continuously
monitors the output voltage for undervoltage and over-
voltage conditions. PGOOD_ is actively held low in
shutdown (ON_ = GND), during soft-start or soft-shut-
down. Approximately 20 μs (typ) after the soft-start
terminates, PGOOD_ becomes high impedance as long
Thermal-Fault Protection (T SHDN )
The MAX17101 features a thermal-fault protection circuit.
When the junction temperature rises above +160°C, a
thermal sensor activates the fault latch, pulls PGOOD1
and PGOOD2 low, enables the 10 Ω discharge circuit,
and disables the controller—DH and DL pulled low.
Toggle ONLDO or cycle IN power to reactivate the con-
troller after the junction temperature cools by 15°C.
as the feedback voltage exceeds 85% of the nominal
Table 4. Fault Protection and Shutdown Operation Table
MODE
Shutdown (ON_ = High to Low);
Output UVP (Latched)
Output OVP (Latched)
V CC UVLO Falling-Edge
Thermal Fault (Latched)
V CC UVLO Rising Edge
CONTROLLER STATE
Voltage soft-shutdown initiated. Internal error-amplifier target
slowly ramped down to GND and output actively discharged
(automatically enters forced-PWM mode).
Controller shuts down and EA target internally slewed down.
Controller remains off until ON_ toggled or V CC power cycled.
SMPS controller disabled (assuming ON_ pulled high), 10
output discharge active.
SMPS controller enabled (assuming ON_ pulled high).
DRIVER STATE
DL driven high and DH pulled
low after soft-shutdown
completed (output < 0.1V).
DL immediately driven high,
DH pulled low.
DL and DH pulled low.
DL driven high, DH pulled low.
V CC POR
SMPS inactive, 10
output discharge active.
DL driven high, DH pulled low.
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