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参数资料
| 型号： | MAX17007AGTI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 22/35页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR QPWM GRAPHICS 28TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | Quick-PWM™ |
| 应用： | 电源 |
| 电流 - 电源： | 1.7mA |
| 电源电压： | 4.5 V ~ 26 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
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Dual and Combinable QPWM Graphics
Core Controllers for Notebook Computers
When SKIP is pulled to GND, the MAX17007/MAX17008
remain in pulse-skipping mode. Since the output is not
able to sink current, the timing for negative dynamic out-
put-voltage transitions depends on the load current and
output capacitance. Letting the output voltage drift down
is typically recommended in order to reduce the potential
for audible noise since this eliminates the input current
surge during negative output-voltage transitions. Figure 5
shows the pulse-skipping/discontinuous crossover point.
Ultrasonic Mode ( S K I P = Open = 3.3V)
Leaving SKIP unconnected or connecting SKIP to 3.3V
activates a unique pulse-skipping mode with a mini-
mum switching frequency of 25kHz. This ultrasonic
pulse-skipping mode eliminates audio-frequency mod-
ulation that would otherwise be present when a lightly
loaded controller automatically skips pulses. In ultra-
sonic mode, the controller automatically transitions to
fixed-frequency PWM operation when the load reaches
the same critical conduction point (I LOAD(SKIP) ) that
occurs when normally pulse skipping.
An ultrasonic pulse occurs when the controller detects
that no switching has occurred within the last 30μs.
Once triggered, the ultrasonic controller pulls DL high,
turning on the low-side MOSFET to induce a negative
inductor current (Figure 6). After the inductor current
reaches the negative ultrasonic current threshold, the
controller turns off the low-side MOSFET (DL pulled
low) and triggers a constant on-time (DH driven high).
When the on-time has expired, the controller reenables
the low-side MOSFET until the controller detects that
the inductor current dropped below the zero-crossing
threshold. Starting with a DL pulse greatly reduces the
peak output voltage when compared to starting with a
DH pulse.
The output voltage at the beginning of the ultrasonic
pulse determines the negative ultrasonic current thresh-
old, resulting in the following equations for SMPS1:
V ISONIC 1 = I L 1 R CS 1 = ( V REFIN 1 ? V CSL 1 ) × 0 . 65
(SMPS1 adjustable mode)
V ISONIC 1 = I L 1 R CS 1 = ( 1 . 05 V ? V CSL 1 ) × 0 . 65
(SMPS1 preset mode)
where V CSL1 > V REFIN1 in adjustable mode, V CSL1 >
1.05V in preset mode, and R CS1 is the current-sense
resistance seen across CSH1 to CSL1.
Similarly for SMPS2:
V ISONIC 2 = I L 2 R CS 2 = ( 0 . 7 V ? V FB 2 ) × 0 . 65
(SMPS2 adjustable mode)
V ISONIC 2 = I L 2 R CS 2 = ( 1 . 5 V ? V CSL 2 ) × 0 . 65
(SMPS2 preset mode)
where V CSL2 > 0.7V in adjustable mode, V CSL2 > 1.5V
in preset mode, and R CS2 is the current-sense resis-
tance seen across CSH2 to CSL2.
In combined mode, ultrasonic mode setting is disabled,
and the SKIP = OPEN (3.3V) setting is identical to the
SKIP = GND setting.
40 μ s (MAX)
INDUCTOR
CURRENT
? I
? t
=
V IN - V OUT
L
I PEAK
I LOAD = I PEAK /2
0
I SONIC
ZERO-CROSSING
DETECTION
ON-TIME (t ON )
0
ON-TIME
TIME
Figure 5. Pulse-Skipping/Discontinuous Crossover Point
Figure 6. Ultrasonic Waveform
22
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17007BGTI+ | 功能描述:电压模式 PWM 控制器 QPWM Graphics Core Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX17007BGTI+T | 制造商:Maxim Integrated Products 功能描述:DUAL AND COMBINABLE QPWM GRAPHICS CORE CONTROLLERS FOR NOTEB - Tape and Reel |
| MAX17007EVKIT+ | 功能描述:电源管理IC开发工具 QPWM Graphics Core Controller 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 |
| MAX17007GTI+ | 功能描述:电压模式 PWM 控制器 QPWM Graphics Core Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX17007GTI+T | 功能描述:电压模式 PWM 控制器 QPWM Graphics Core Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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