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| 型号： | MAX5099ATJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/27页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ DL 32TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 17.1 V |
| 输入电压： | 4.5 V ~ 19 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 200kHz ~ 2.2MHz |
| 电流 - 输出： | 1A，2A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
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Dual, 2.2MHz, Automotive Synchronous Buck
Converter with 80V Load-Dump Protection
capacitance requirement. Note that the two converters
of the MAX5099 run 180° out-of-phase, thereby effec-
SOURCE_
V OUT_
BYPASS
V OUT_
tively doubling the switching frequency at the input.
The input ripple waveform would be unsymmetrical due
FB_
R A
FB_
R C
to the difference in load current and duty cycle between
converter 1 and converter 2. The worst-case mismatch
is when one converter is at full load while the other is at
no load or in shutdown. The input ripple is comprised of
Δ V Q (caused by the capacitor discharge) and Δ V ESR
MAX5099
R B
MAX5099
R A
(caused by the ESR of the capacitor). Use ceramic
capacitors with high ripple-current capability at the input
connected between DRAIN_ and PGND. Assume the
SOURCE_
contribution from the ESR and capacitor discharge
V OUT_ ≥ 0.8V
V OUT_ < 0.8V
equal to 50%. Calculate the input capacitance and ESR
required for a specified ripple using the following equa-
tions:
I OUT +
Figure 2. Adjustable Output Voltage
Inductor Selection
Three key inductor parameters must be specified for
operation with the MAX5099: inductance value (L),
where
ESR IN =
Δ V ESR
Δ I L
2
peak inductor current (I L ), and inductor saturation cur-
rent (I SAT ). The minimum required inductance is a func-
tion of operating frequency, input-to-output voltage
differential, and the peak-to-peak inductor current ( Δ I L ).
Δ I L =
( V IN ? V OUT ) × V OUT
V IN × f SW × L
V OUT ( V IN ? V OUT )
V IN × f SW × Δ I L
A good compromise is to choose ΔI L equal to 30% of
the full load current. To calculate the inductance, use
the following equation:
L =
and
where
C IN =
I OUT × D ( 1 ? D )
Δ V Q × f SW
D = OUT
where V IN and V OUT are typical values (so that efficien-
cy is optimum for typical conditions). The switching fre-
quency is set by R OSC (see the Setting the Switching
Frequency section). The peak-to-peak inductor current,
which reflects the peak-to-peak output ripple, is worse
at the maximum input voltage. See the Output
Capacitor section to verify that the worst-case output
ripple is acceptable. The inductor saturation current is
also important to avoid runaway current during output
overload and continuous short circuit. Select the I SAT to
be higher than the maximum peak current limits of 4.3A
and 2.6A for converter 1 and converter 2.
Input Capacitor
The discontinuous input current waveform of the buck
converter causes large ripple currents at the input. The
switching frequency, peak inductor current, and allow-
able peak-to-peak voltage ripple dictate the input
V
V IN
where I OUT is the maximum output current from either
converter 1 or converter 2, and D is the duty cycle for
that converter. f SW is the frequency of each individual
converter. For example, at V IN = 12V, V OUT = 3.3V at
I OUT = 2A, and with L = 3.3 μH, the ESR and input
capacitance are calculated for a peak-to-peak input rip-
ple of 100mV or less, yielding an ESR and capacitance
value of 20m Ω and 6.8μF for 1.25MHz frequency. At low
input voltages, also add one electrolytic bulk capacitor
of at least 100μF on the converters’ input voltage rail.
This capacitor acts as an energy reservoir to avoid pos-
sible undershoot below the undervoltage-lockout thresh-
old during power-on and transient loading.
18
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| MAX5099ATJ+ | 功能描述:直流/直流开关转换器 Dual 2.2MHz Synch Buck Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX5099ATJ+T | 功能描述:直流/直流开关转换器 Dual 2.2MHz Synch Buck Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX5099EVKIT+ | 功能描述:电源管理IC开发工具 MAX5098A/99 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 |
| MAX509ACAP | 功能描述:数模转换器- DAC RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
| MAX509ACAP+ | 功能描述:数模转换器- DAC 8-Bit 4Ch Precision DAC RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
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