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| 型号： | MAX17007AGTI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 21/35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
Soft-Start
Soft-start begins when EN is driven high and REF is in
regulation. During soft-start, the output is ramped up
from 0V to the final set voltage at 1.3mV/μs slew rate for
SMPS1, and 0.65mV/μs for SMPS2, reducing the inrush
current and providing a predictable ramp-up time for
power sequencing:
response). This eliminates the need for the Schottky
diode normally connected between the output and
ground to clamp the negative output-voltage excursion.
Modes of Operation
Forced-PWM Mode ( S K I P = 5V)
The low-noise forced-PWM mode ( SKIP = 5V) disables
t START 1 = t SHDN 1 = =
V REFIN 1
SR SS 1
V REFIN 1
1 . 3 mV / μ s
the zero-crossing comparator, which controls the low-
side switch on-time. This forces the low-side gate-drive
waveform to constantly be the complement of the high-
side gate-drive waveform, so the inductor current
t START 2 = t SHDN 2 =
V FB 2
SR SS 2
=
V FB 2
0 . 65 mV / μ s
reverses at light loads while DH maintains a duty factor
of V OUT /V IN . The benefit of forced-PWM mode is to
keep the switching frequency fairly constant. However,
The soft-start circuitry does not use a variable current
limit, so full output current is available immediately. The
respective PGOOD becomes high impedance approxi-
mately 200μs after the target voltage has been
reached. The MAX17007/MAX17008 automatically use
pulse-skipping mode during soft-start and use forced-
PWM mode during soft-shutdown, regardless of the
SKIP configuration.
For automatic startup, the battery voltage should be
present before V CC . If the controller attempts to bring
the output into regulation without the battery voltage
present, the fault latch trips. The controller remains shut
down until the fault latch is cleared by toggling EN or
cycling the V CC power supply below 0.5V.
Soft-Shutdown
Soft-shutdown begins when the system pulls EN low,
an output undervoltage fault, or a thermal fault. During
soft-shutdown, the respective PGOOD is pulled low
immediately and the output voltage ramps down with
the same startup slew rate for the respective outputs.
After the controller reaches the 0V target, the drivers
are disabled (DL_ and DH_ pulled low) and the internal
10 ? discharge on CSL_ activated. The MAX17007/
MAX17008 shut down completely when both EN are
low—the reference turns off after both SMPSs have
reached the 0V target, and the supply current drops to
about 1μA (max).
Slowly discharging the output capacitors by slewing
the output over a long period of time (typically 0.5ms to
2ms) keeps the average negative inductor current low
(damped response), thereby preventing the negative
output-voltage excursion that occurs when the con-
troller discharges the output quickly by permanently
turning on the low-side MOSFET (underdamped
forced-PWM operation comes at a cost: the no-load 5V
bias current remains between 2mA to 5mA, depending
on the switching frequency.
The MAX17007/MAX17008 automatically use forced-
PWM operation during shutdown, regardless of the
SKIP configuration.
Automatic Pulse-Skipping Mode
( S K I P = GND or 2V)
In skip mode ( SKIP = GND or 2V), an inherent automatic
switchover to PFM takes place at light loads. This
switchover is affected by a comparator that truncates
the low-side switch on-time at the inductor current’s
zero crossing. The zero-crossing comparator threshold
is set by the differential across CSL_ and CSH_.
DC output-accuracy specifications refer to the thresh-
old of the error comparator. When the inductor is in con-
tinuous conduction, the MAX17007/MAX17008 regulate
the valley of the output ripple, so the actual DC output
voltage is higher than the trip level by 50% of the output
ripple voltage. In discontinuous conduction ( SKIP =
GND or 2V and I OUT < I LOAD(SKIP) ), the output voltage
has a DC regulation level higher than the error-com-
parator threshold by approximately 1.5% due to slope
compensation. However, the internal integrator corrects
for most of it, resulting in very little load regulation.
When SKIP = 2V, the MAX17007/MAX17008 use forced-
PWM operation during all dynamic output-voltage transi-
tions until 100μs after the transition has been
completed—REFIN1 and the internal target are within
±50mV (typ) and an error-amplifier transition is detected.
Since SMPS2 does not support dynamic transitions, SKIP
= 2V and SKIP = GND have the same pulse-skipping
behavior without any forced-PWM transitions.
______________________________________________________________________________________
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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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