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| 型号： | MAX15049ETJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/31页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM STP-DN TRIPL 32WQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 应用： | 电源控制器，序列发生器 |
| 电源电压： | 4.7 V ~ 23 V |
| 电流 - 电源： | 6mA |
| 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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MAX15048/MAX15049
Triple-Output Buck Controllers
with Tracking/Sequencing
(f SW ) is programmable between 200kHz and 1.2MHz
(see the Setting the Switching Frequency section). The
For the condition with only one converter on, calculate
the input-ripple current using the following equation:
peak-to-peak inductor current ( D I P-P ), which reflects
the peak-to-peak output ripple, is worst at the maximum
input voltage. See the Output-Capacitor Selection sec-
tion to verify that the worst-case output current ripple is
I CIN(RMS) = I LOAD(MAX) ×
V OUT_ × ( V IN - V OUT_ )
V IN
? I P-P
8 × ? V Q SW
? V ESR
? V ESR
? I P-P ?
? I LOAD(MAX) +
?
I LOAD(MAX) × ? ?
? V IN ?
( ? V Q + f SW )
( V IN - V OUT_ ) × V OUT_
? I P-P =
acceptable. The inductor saturation current (I SAT ) is also
important to avoid runaway current during continuous
output short-circuit conditions. Select an inductor with an
I SAT specification higher than the maximum peak cur-
rent. Inductor parasitic resistance (DCR) causes copper
losses and affects efficiency. Select a low-loss inductor
having the lowest possible DCR that fits in the allocated
dimensions.
Input-Capacitor Selection
The discontinuous input current of the buck converter
causes large input-ripple currents, and therefore, the
input capacitor must be carefully chosen to withstand
the input-ripple current and keep the input-voltage
ripple within design requirements. The 120° ripple phase
operation increases the frequency of the input capacitor
ripple current to thrice the individual converter switching
frequency. When using ripple phasing, the worst-case
input-capacitor ripple current is when only one converter
with the highest output current is on.
The input-voltage ripple comprises D V Q (caused by the
capacitor discharge) and D V ESR (caused by the ESR of
the input capacitor). The total voltage ripple is the sum of
D V Q and D V ESR , which peaks at the end of the on cycle.
Calculate the input capacitance and ESR required for a
specified ripple using the following equations:
ESR =
?
? 2 ?
? V OUT_ ?
C IN =
where:
V IN × f SW × L
I LOAD(MAX) is the maximum output current, D I P-P is the
peak-to-peak inductor current, and f SW is the switching
frequency.
20
The MAX15048/MAX15049 include UVLO hysteresis to
avoid possible unintentional chattering during turn-on.
Use additional bulk capacitance if the input source
impedance is high. At lower input voltage, additional
input capacitance helps avoid possible undershoot
below the UVLO threshold during transient loading.
Output-Capacitor Selection
The allowed output-voltage ripple and the maximum
deviation of the output voltage during load steps deter-
mine the required output capacitance and its ESR. The
steady-state output ripple is mainly composed of D V Q
(caused by the capacitor discharge) and D V ESR (caused
by the voltage drop across the ESR of the output capaci-
tor). The equations for calculating the output capaci-
tance and its ESR are:
C OUT =
× f
ESR =
? I P-P
D V ESR and D V Q are not directly additive since they are
out of phase from each other. If using ceramic capaci-
tors, which generally have low ESR, D V Q dominates. If
using electrolytic capacitors, D V ESR dominates.
The allowable deviation of the output voltage during fast-
load transients also affects the output capacitance, its
ESR, and its ESL. The output capacitor supplies the load
current during a load step until the controller responds
with a greater duty cycle. The response time (t RESPONSE )
depends on the gain bandwidth of the converter (see the
Compensation Design Guidelines section). The resistive
drop across the output capacitor’s ESR, the drop across
the capacitor’s ESL, and the capacitor discharge causes
a voltage droop during the load-step (I STEP ). Use a com-
bination of low-ESR tantalum/aluminum electrolytic and
ceramic capacitors for better load-transient and voltage-
ripple performance. Nonleaded capacitors and capaci-
tors in parallel help reduce the ESL. Keep the maximum
output-voltage deviation below the tolerable limits of the
electronics being powered.
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15049ETJ+ | 功能描述:DC/DC 开关控制器 1.2MHz Triple Buck w/Tracking RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX15049ETJ+ | 制造商:Maxim Integrated Products 功能描述:IC BUCK CNTRL TRIPLE 32WQFN 制造商:Maxim Integrated Products 功能描述:IC, BUCK, CNTRL, TRIPLE, 32WQFN |
| MAX15049ETJ+ | 制造商:Maxim Integrated Products 功能描述:IC PWM STEP-DOWN DC/DC CONVER |
| MAX15049ETJ+T | 功能描述:DC/DC 开关控制器 1.2MHz Triple Buck w/Tracking RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX15049EVKIT+ | 功能描述:电源管理IC开发工具 MAX15049 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 |
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