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参数资料
| 型号： | MAX16955AUE/V+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/26页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16TSSOP |
| 其它有关文件： | Automotive Product Guide |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 96 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 电源电压： | 3.5 V ~ 36 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
MAX16955
36V, 1MHz Step-Down Controller
with Low Operating Current
Detailed Description
The MAX16955 is a current-mode, synchronous PWM
buck controller designed to drive logic-level MOSFETs.
The device tolerates a wide 3.5V to 42V input voltage
range and generates an adjustable 1V to 10V or fixed
5V output voltage. This device can operate in dropout
mode, making it ideal for automotive and industrial
applications with undervoltage transients.
The internal switching frequency is adjustable from
220kHz to 1MHz with an external resistor and can be
synchronized to an external clock. The high switching
frequency reduces output ripple and allows the use of
small external components. The device operates in
both fixed-frequency PWM mode and a low quiescent
current skip mode. While working in skip mode, the
operating current is as low as 50μA.
The device features an enable logic input to disable the
device and reduce its shutdown current to 10 μA.
Protection features include cycle-by-cycle current limit,
overvoltage detection, and thermal shutdown. The
device also features integrated soft-start and a power-
good monitor to help with power sequencing.
Supply Voltage Range (SUP)
The supply voltage range (V SUP ) of the MAX16955 is com-
patible to the typical automotive battery voltage range
from 3.5V to 36V and can tolerate up to 42V transients.
If an external 5V rail is available, use this rail to power
the MAX16955 to increase efficiency by bypassing the
internal LDO. Connect both BIAS and SUP to this rail,
while connecting the half-bridge rectifier to the battery.
Slow Ramp-Up of the Input Voltage
If the input voltage (V SUP ) ramps up slowly, the device
operates in dropout mode until V SUP is greater than the
regulated output voltage. The dropout mode is detect-
ed by monitoring high-side FET on for eight clock
cycles. Once dropout mode is detected, the controller
issues a forced low-side pulse at the rising edge of
switching clock to refresh BST capacitor. This maintains
the proper BST voltage to turn on the high-side MOS-
FET when the device is in dropout mode.
System Enable (EN) and Soft-Start
An enable control input (EN) activates the MAX16955
from its low-power shutdown mode. EN is compatible
with inputs from automotive battery level down to 3.5V.
The high-voltage compatibility allows EN to be connect-
ed to SUP, KEY/KL30, or the inhibit pin (INH) of a CAN
transceiver.
A logic-high at EN turns on the internal regulator. Once
V BIAS is above the internal lockout level, V UVL = 3.1V
12
(max), the controller starts up with a 5ms fixed soft-start
time. Once regulation is reached, PGOOD goes high
impedance.
A logic-low at EN shuts down the device. During shut-
down, the internal linear regulator and gate drivers turn
off. Shutdown is the lowest power state and reduces
the quiescent current to 10μA (typ).
To protect the low-side MOSFET during shutdown, the
step-down regulator cannot be enabled until the output
voltage drops below 1.25V. An internal 30 Ω pulldown
switch helps discharge the output. If the EN pin is tog-
gled low then high, the switching regulator shuts down
and remains off until the output voltage decays to
1.25V. At this point, the MAX16955 turns on using the
soft-start sequence.
Fixed 5V Linear Regulator (BIAS)
The MAX16955 has an internal 5V linear regulator to
provide its own 5V bias from a high-voltage input sup-
ply at SUP. This bias supply powers the gate drivers for
the external n-channel MOSFETs and provides the
power required for the analog controller, reference, and
logic blocks. The bias rail needs to be stabilized by a
1μF or greater capacitance at BIAS, and can provide
up to 50mA (typ) total current.
The linear regulator has an overcurrent threshold of
approximately 100mA. In case of an overcurrent event,
the current is limited to 100mA and the BIAS voltage
starts to droop. As soon as V BIAS drops to 2.9V (typ),
the LDO shuts down and the power MOSFETs are
turned off.
Oscillator Frequency and External
Synchronization
The MAX16955 provides an internal oscillator
adjustable from 220kHz to 1MHz. To set the switching
frequency, connect a resistor from FOSC to SGND. See
the Setting the Switching Frequency section.
The MAX16955 can also be synchronized to an external
clock by connecting the external clock signal to
FSYNC. For proper frequency synchronization,
FSYNC’s input frequency must be at least 10% higher
than the programmed internal oscillator frequency. A
rising clock edge on FSYNC is interpreted as a syn-
chronization input. If the FSYNC signal is lost, the inter-
nal oscillator takes control of the switching rate,
returning to the switching frequency set by the resistor
connected to FOSC. This maintains output regulation
even with intermittent FSYNC signals. The maximum
synchronizable frequency is 1.1MHz.
When FSYNC is connected to SGND, the device oper-
ates in skip mode. When FSYNC is connected to BIAS
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16955EVKIT# | 功能描述:电源管理IC开发工具 MAX16955 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 |
| MAX16955EVKIT+ | 功能描述:电源管理IC开发工具 MAX16955 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 |
| MAX16956AUBA/V+T | 制造商:Maxim Integrated Products 功能描述:36V, 300MA, MINI BUCK CONVERTER WITH 2UA IQ - Tape and Reel |
| MAX16958GEE/V+ | 功能描述:模数转换器 - ADC 500mA Hi-Speed USB Protector RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX16958GEE/V+T | 功能描述:模数转换器 - ADC 500mA Hi-Speed USB Protector RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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