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| 型号： | MAX16955AUE/V+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/26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
ensures that fast-rising LX edges do not pull up the
low-side MOSFET’s gate, causing shoot-through cur-
rents. The capacitive coupling between LX and DL cre-
ated by the MOSFET’s gate-to-drain capacitance (C GD
= C RSS ), gate-to-source capacitance (C GS = C ISS -
V GS ( TH ) > V SUP ? RSS ?
t ON(SKIP) =
V OUT
V SUP f SW
I PK
I LOAD = I PK /2
C GD ), and additional board parasitic should not
exceed the following minimum threshold:
? C ?
? C ISS ?
High-Side Gate-Drive Supply (BST)
The high-side MOSFET is turned on by closing an inter-
nal switch between BST and DH. This provides the
0
ON-TIME
TIME
necessary gate-to-source voltage to turn on the high-
side MOSFET, an action that boosts the gate-drive signal
above V SUP . The boost capacitor connected between
Figure 1. Pulse-Skipping/Discontinuous Crossover Point
An adaptive dead-time circuit monitors the DH and DL
outputs and prevents the opposite-side MOSFET from
turning on until the other MOSFET is fully off. Thus, the
circuit allows the high-side driver to turn on only when
the DL gate driver has been turned off. Similarly, it pre-
vents the low-side (DL) from turning on until the DH
gate driver has been turned off.
The adaptive driver dead-time allows operation without
shoot-through with a wide range of MOSFETs, minimiz-
ing delays and maintaining efficiency. There must be a
low-resistance, low-inductance path from the DL and
DH drivers to the MOSFET gates for the adaptive dead-
time circuits to work properly. Otherwise, because of
the stray impedance in the gate discharge path, the
sense circuitry could interpret the MOSFET gates as off
while the V GS of the MOSFET is still high. To minimize
stray impedance, use very short, wide traces (50 mils to
100 mils wide if the MOSFET is 1in from the controller).
Synchronous rectification reduces conduction losses in
the rectifier by replacing the normal low-side Schottky
catch diode with a low-resistance MOSFET switch. The
internal pulldown transistor that drives DL low is
robust, with a 1.6 Ω (typ) on-resistance. This low on-
resistance helps prevent DL from being pulled up dur-
ing the fast rise time of the LX node, due to capacitive
coupling from the drain to the gate of the low-side syn-
chronous rectifier MOSFET. Applications with high
input voltages and long-inductive driver traces can
require additional gate-to-source capacitance. This
Maxim Integrated
BST and LX holds up the voltage across the flying gate
driver during the high-side MOSFET on-time.
The charge lost by the boost capacitor for delivering
the gate charge is refreshed when the high-side
MOSFET is turned off and the LX node swings down
to ground. When the LX node is low, an internal high-
voltage switch connected between BIAS and BST
recharges the boost capacitor to the BIAS voltage.
See the Boost-Flying Capacitor Selection section to
choose the right size of the boost capacitor.
Dropout Behavior During Undervoltage Transients
The controller generates a low-side pulse every four
clock cycles to refresh the BST capacitor during low-
dropout operation. This guarantees that the MAX16955
operates in dropout mode during undervoltage tran-
sients like cold crank.
Current Limiting and Current-Sense Inputs
(CS and OUT)
The current-limit circuit uses differential current-sense
inputs (CS and OUT) to limit the peak inductor current.
If the magnitude of the current-sense signal exceeds
the current-limit threshold, the PWM controller turns off
the high-side MOSFET. The actual maximum load cur-
rent is less than the peak current-limit threshold by an
amount equal to half the inductor ripple current.
Therefore, the maximum load capability is a function of
the current-sense resistance, inductor value, switching
frequency, and duty cycle (V OUT /V SUP ). See the
Current Sensing section.
15
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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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