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参数资料
| 型号： | MAX16974AUE/V+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/19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
When using low-capacity filter capacitors, such as
ceramic capacitors, size is usually determined by the
capacity needed to prevent V SAG and V SOAR from caus-
ing problems during load transients. Generally, once
enough capacitance is added to meet the overshoot
requirement, undershoot at the rising-load edge is no
longer a problem (see the V SAG and V SOAR equations
in the Transient Response section). However, low-
capacity filter capacitors typically have high-ESR zeros
Transient Response
The inductor ripple current also impacts transient
response performance, especially at low V SUP - V OUT
differentials. Low inductor values allow the inductor cur-
rent to slew faster, replenishing charge removed from the
output filter capacitors by a sudden load step. The total
output-voltage sag is the sum of the voltage sag while
the inductor is ramping up and the voltage sag before
the next pulse can occur:
(
)
L ? I LOAD(MAX)
that can affect the overall stability. Other important crite-
ria in the choice of the total output capacitance are the
device’s soft-start time and maximum current capability
(see the Soft-Start Time and Maximum Allowed Output
V SAG =
2
2C OUT ( ( V SUP × D MAX ) ? V OUT )
+
? I LOAD(MAX) ( t ? ? t )
C OUT
(
)
× L/ ( 2 x C OUT OUT )
≈ ? I
× V
V SOAR LOAD(MAX)
1/ ? V OUT × ? ? I LX(MIN) LOAD(MAX) ? ?
Capacitance section).
Soft-Start Time and Maximum
Allowed Output Capacitance
The device’s soft-start time depends on the selected
switching frequency. The soft-start time is fixed to 2048
cycles, regardless of the switching frequency. This
means at 2.2MHz the soft-start time is ~0.93ms, and at
220kHz the soft-start time is ~9.3ms.
The device is a 2A-capable switching regulator and the
amount of load present at startup determines the total
output capacitance allowed for a particular application.
C OUT(MAX) ≈ 2048/f SW ×
- I
Keeping the above equation in mind, see the following
table to ensure that C OUT is less than maximum allowed
values.
FREQUENCY_=_400kHz
where D MAX is the maximum duty factor (see the
Electrical Characteristics table), L is the inductor value
in F H, C OUT is the output capacitor value in F F, t is the
switching period (1/f SW ) in F s, and δt equals (V OUT /
V SUP x t when in fixed-frequency PWM mode, or L x 0.2
x I MAX /(V SUP - V OUT ) when in skip mode. The amount of
overshoot (V SOAR ) during a full-load to a no-load tran-
sient due to stored inductor energy can be calculated
as:
2
Rectifier Selection
The device requires an external Schottky diode rectifier
as a freewheeling diode. Connect this rectifier close
to the device using short leads and short PCB traces.
Choose a rectifier with a continuous current rating greater
than the highest output current-limit threshold (3.5A), and
with a voltage rating greater than the maximum expected
input voltage, V SUPSW . Use a low forward-voltage-drop
Schottky rectifier to limit the negative voltage at LX. Avoid
V OUT _(V)
3.3
5
3.3
5
I LOAD _
(STARTUP)_(A)
2
2
0
0
C OUT
(MAX_ALLOWED)
775 F F
512 F F
3.9mF
2.6mF
higher than necessary reverse-voltage Schottky rectifiers
that have higher forward-voltage drops.
Compensation Network
The device uses an internal transconductance error
amplifier with its inverting input and output available
to the user for external frequency compensation. The
V OUT _(V)
FREQUENCY_=_2.2MHz
I LOAD _
(STARTUP)_(A)
3.3 2
5 2
3.3 0
5 0
C OUT
(MAX_ALLOWED)
140 F F
93 F F
705 F F
465 F F
output capacitor and compensation network determine
the loop stability. The inductor and the output capaci-
tor are chosen based on performance, size, and cost.
Additionally, the compensation network optimizes the
control-loop stability.
The controller uses a current-mode control scheme that
regulates the output voltage by forcing the required cur-
rent through the external inductor, so the device uses
_______________________________________________________________________________________ _ 15
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| MAX16974EVKIT+ | 功能描述:电源管理IC开发工具 MAX16974 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 |
| MAX16975AAEE/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 |
| 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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