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| 型号： | MAX17020ETJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 24/34页 |
| 文件大小： | 0K |
| 描述： | IC CTLR PWM DUAL STEP DN 32-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 系列： | Quick-PWM™ |
| 应用： | 电源 |
| 电流 - 电源： | 1mA |
| 电源电压： | 6 V ~ 24 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 管件 |
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Dual Quick-PWM Step-Down Controller
with Low-Power LDO, RTC Regulator
R FBH FBL × ? OUT 1 ? 1 ?
= R
When V CC drops below the UVLO threshold (falling
edge), the controller stops switching, and DH and DL are
pulled low and a 10 Ω switch discharges the outputs.
When the 2V POR falling-edge threshold is reached, the
DL state no longer matters since there is not enough volt-
age to force the switching MOSFETs into a low on-resis-
tance state, so the controller pulls DL high, allowing a
soft discharge of the output capacitors (damped
response). However, if the V CC recovers before reaching
the falling POR threshold, DL remains low until the error
comparator has been properly powered up and triggers
an on-time. Only one enable input needs to be toggled
to clear the fault latches and activate both outputs.
Soft-Start and Soft-Shutdown
The MAX17020 includes voltage soft-start and soft-
shutdown—slowly ramping up and down the target volt-
age. During startup, the slew-rate control softly slews
the preset/fixed target voltage over a 1ms startup peri-
od or its tracking voltage (REFIN2 < 2V) with a 1mV/μs
slew rate. This long startup period reduces the inrush
current during startup.
When ON1 or ON2 is pulled low or the output undervolt-
age fault latch is set, the respective output automatically
enters soft-shutdown—the regulator enters PWM mode
and ramps down its preset/fixed output voltage over a
1ms period or its tracking voltage (REFIN2 < 2V) with a
1mV/μs slew rate. After the output voltage drops below
0.1V, the MAX17020 pulls DL high, clamping the output
and LX switching node to ground, preventing leakage
currents from pulling up the output and minimizing the
negative output voltage undershoot during shutdown.
Output Voltage
DC output-accuracy specifications in the Electrical
the output voltage regulates slightly higher than it would
in PWM operation.
Internal Integrator
The internal integrator improves the output accuracy by
removing any output accuracy errors caused by the
slope compensation, output ripple voltage, and error-
amplifier offset. Therefore, the DC accuracy (in forced-
PWM mode) depends on the integrator’s gain, the inte-
grator’s offset, and the accuracy of the integrator’s refe-
rence input.
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
external resistive voltage-divider from OUT1 to analog
ground to adjust the output voltage between 0.7V and
5.5V. During soft-shutdown, application circuits config-
ured 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 0V 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:
R REFINH = R REFINL × ?
? 1 ?
Characteristics table refer to the error comparator’s
threshold. When the inductor continuously conducts, the
MAX17020 regulates the valley of the output ripple, so
? V REF
? V OUT 2
?
?
V OUT ( PWM ) = V NOM + ? RIPPLE ?
the actual DC output voltage is lower than the slope-com-
pensated trip level by 50% of the output ripple voltage.
For PWM operation (continuous conduction), the output
voltage is accurately defined by the following equation:
? V ?
? 2 A CCV ?
where V NOM is the nominal feedback voltage, A CCV is
the integrator’s gain, and V RIPPLE is the output ripple
voltage (V RIPPLE = ESR x Δ I INDUCTOR , as described in
the Output Capacitor Selection section).
In discontinuous conduction (I OUT < I LOAD(SKIP) ), the
longer off-times allow the slope compensation to
increase the threshold voltage by as much as 1%, so
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 shut-
down (ON_ = GND), during soft-start or soft-shutdown.
Approximately 20 μs (typ) after the soft-start
terminates, PGOOD_ becomes high impedance as long
as the feedback voltage exceeds 85% of the nominal
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
24
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相关代理商/技术参数 |
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| MAX17020ETJ+ | 功能描述:电压模式 PWM 控制器 Quick-PWM Step-Down Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX17020ETJ+T | 功能描述:电压模式 PWM 控制器 Quick-PWM Step-Down Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX17020EVKIT+ | 制造商:Maxim Integrated Products 功能描述:SINGLE QUICK-PWM STEP-DOWN CONTROLL - Boxed Product (Development Kits) |
| MAX17021EVKIT+ | 功能描述:电源管理IC开发工具 MAX17021 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX17021GTL+ | 功能描述:电压模式 PWM 控制器 Dual-Phase, Quick-Pw M Controllers For Im RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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