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参数资料
| 型号： | MAX16974AUE/V+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/19页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 5V/ADJ 16TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 96 |
| 类型： | 降压（降压） |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 5V，1 V ~ 10 V |
| 输入电压： | 3.5 V ~ 28 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 260kHz ~ 2.2MHz |
| 电流 - 输出： | 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： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-TSSOP-EP |
High-Voltage, 2.2MHz, 2A Automotive Step-
Down Converter with Low Operating Current
where
2.8
2.4
2.0
1.6
1.2
0.8
SWITCHING FREQUENCY vs. R FOSC
I BST(DROPOUT) = 3mA (worst case)
dt (no load) = 16 clock cycles
dV (BST capacitor) = V OUT - 2.7V.
Reset Timeout Period
The device offers a capacitor-adjustable reset timeout
period. Connect up to 0.1 F F capacitor from CRES to
GND to set the timeout period. CRES can source 10 F A
of current. Use the following formula to set the timeout
period:
10 × 10 A
0.4
0
12 22 32 42 52 62 72 82 92 102 112 122
RESET_TIMEOUT =
1.25V × C
-6
(s),
L = OUT SUP OUT
R FOSC (kI)
Figure 4. Switching Frequency vs. R FOSC
Assume a full 100mA is needed to refresh the BST
capacitor. Depending on the size of the inductor, the time
it takes to build up a full 100mA in the inductor is given by:
dt (inductor) = L x di/dV (current buildup starts from the
6th clock cycle)
L = inductor value chosen in the design guide
di is the required current = 100mA
dV = voltage across the inductor (assume this to be
0.5V), which means V IN is greater than V OUT by 0.5V
If dt (inductor) < 7.65 - 6 (clock cycles), the BST capaci-
tor should be sized as follows:
BST_CAP ≥ I BST(DROPOUT) x dt (no load)/dV
(BST capacitor)
dt (no load) = 7.65 clock cycles = 34.77μs
dV (BST capacitor) for (3.3V to 5V) output = V OUT - 2.7V
(2.7V is the minimum voltage allowed on the bst capacitor)
If dt (inductor) > 7.65 - 6 clock cycles, then wait for the
next count of 3.65 clock cycles making dt (no load) =
11.65 clock cycles.
Considering the typical inductor values used for 220kHz
operation, the safe way to design the BST capacitor is
to assume:
dt (no load) as 16 clock cycles
So the final BST_CAPACITOR equation is:
BST_CAP = I BST(DROPOUT) x dt (no load)/dV (BST
capacitor)
where C is the capacitor from CRES to GND in Farads.
Internal Oscillator
The switching frequency, f SW , is set by a resistor
(R FOSC ) connected from FOSC to GND. See Figure 4 to
select the correct R FOSC value for the desired switching
frequency.
For example, a 2.2MHz switching frequency is set with
R FOSC = 12.1k I . Higher frequencies allow designs
with lower inductor values and less output capacitance.
Consequently, peak currents and I 2 R losses are lower
at higher switching frequencies, but core losses, gate-
charge currents, and switching losses increase.
Inductor Selection
Three key inductor parameters must be specified for
operation with the device: inductance value (L), inductor
saturation current (I SAT ), and DC resistance (R DCR ). To
select inductance value, the ratio of inductor peak-to-
peak AC current to DC average current (LIR) must be
selected first. A good compromise between size and
loss is a 30% peak-to-peak ripple current to average
current ratio (LIR = 0.3). The switching frequency, input
voltage, output voltage, and selected LIR determine the
inductor value as follows:
V (V ? V )
V SUP f SW I OUT LIR
where V SUP , V OUT , and I OUT are typical values so that
efficiency is optimum for typical conditions. The switch-
ing frequency is set by R FOSC (see the Internal Oscillator
section). The exact inductor value is not critical and can
be adjusted to make trade-offs among size, cost, effi-
ciency, and transient response requirements.
_______________________________________________________________________________________ _ 13
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| MAX16975AAEE/V+T | 功能描述:直流/直流开关转换器 28V 1A 2MHz Step Down 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 |
| MAX16975AEE/V+ | 功能描述:直流/直流开关转换器 28V 1A 2MHz Step Down 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 |
| MAX16975AEE/V+T | 功能描述:直流/直流开关转换器 28V 1A 2MHz Step Down 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 |
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