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| 型号： | MAX17080GTL+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 29/48页 |
| 文件大小： | 0K |
| 描述： | IC CONTROLLER AMD SVI 40-TQFN |
| 标准包装： | 60 |
| 应用： | 控制器，AMD SVI |
| 输入电压： | 2.7 V ~ 5.5 V |
| 输出数： | 3 |
| 输出电压： | 0.013 V ~ 1.55 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（5x5） |
| 包装： | 管件 |
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AMD 2-/3-Output Mobile Serial
VID Controller
SVC/SVD
SMPS LOAD
PWRGD UPPER THRESHOLD
SMPS VOLTAGE
BUS IDLE
LIGHT LOAD
UPPER THRESHOLD BLANKED
SMPS TARGET
BUS IDLE
BUS IDLE
HEAVY LOAD
(SMPS TARGET)
PWRGD LOWER
THRESHOLD
PWRGD
BLANK
HIGH-Z
20 μ s
BLANK
HIGH-Z
20 μ s
BLANK
HIGH-Z
20 μ s
Figure 5. VID Transition Timing
V ( V ? V )
2 V IN SW L
Each SMPS can be individually set to operate in pulse-
skipping mode when its PSI_L bit is set to 0, or set to
operate in forced-PWM mode when its PSI_L bit is set
to 1.
When the core SMPSs are configured for combined-
mode operation, core supplies operate in 1-phase
pulse-skipping mode when PSI_L = 0, and core sup-
plies are in 2-phase forced-PWM mode when PSI_L = 1.
Idle-Mode Current-Sense Threshold
The idle-mode current-sense threshold forces a lightly
loaded SMPS to source a minimum amount of power
with each on-time since the controller cannot terminate
the on-time until the current-sense voltage exceeds the
idle-mode current-sense threshold (V IDLE = 0.15 x
V LIMIT for the core SMPS and I LX3MIN = 0.25 x I LX3PK
setting for the NB SMPS). Since the zero-crossing com-
parator prevents the switching SMPS from sinking
current, the controller must skip pulses to avoid over-
charging the output. When the clock edge occurs, if the
output voltage still exceeds the feedback threshold, the
controller does not initiate another on-time. This forces
the controller to actually regulate the valley of the out-
put voltage ripple under light load conditions.
Automatic Pulse-Skipping Crossover
In skip mode, the MAX17080 zero-crossing compara-
tors are active. Therefore, an inherent automatic
switchover to PFM takes place at light loads, resulting
in a highly efficient operating mode. This switchover is
affected by a comparator that truncates the low-side
switch on-time at the inductor current’s zero crossing.
The driver ’s zero-crossing comparator senses the
inductor current across the low-side MOSFET. Once
V GND - V LX drops below the zero-crossing threshold,
the driver forces DL low. This mechanism causes the
threshold between pulse-skipping PFM and nonskip-
ping PWM operation to coincide with the boundary
between continuous and discontinuous inductor-current
operation (also known as the critical conduction point).
The load-current level at which the PFM/PWM crossover
occurs, I LOAD(SKIP) , is given by:
I LOAD ( SKIP ) = OUT IN OUT
f
The switching waveforms can appear noisy and asyn-
chronous when light loading causes pulse-skipping
operation, but this is a normal operating condition that
results in high light-load efficiency. Trade-off in PFM
noise vs. light-load efficiency is made by varying the
inductor value. Generally, low inductor values produce a
broader efficiency vs. load curve, while higher values
result in higher full-load efficiency (assuming that the coil
resistance remains fixed) and less output voltage ripple.
Penalties for using higher inductor values include larger
physical size and degraded load-transient response
(especially at low input-voltage levels).
Current Sense
Core SMPS Current Sense
The output current of each phase is sensed differentially.
A low offset voltage and high-gain differential current
amplifier at each phase allows low-resistance current-
sense resistors to be used to minimize power dissipa-
tion. Sensing the current at the output of each phase
offers advantages, including less noise sensitivity, more
accurate current sharing between phases, and the flex-
ibility of using either a current-sense resistor or the DC
resistance of the output inductor.
______________________________________________________________________________________
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相关代理商/技术参数 |
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| MAX17080GTL+ | 功能描述:开关变换器、稳压器与控制器 Integrated Circuits (ICs) Voltage Regulators - Special Purpose - IC CONTROLLER AMD SVI 40-TQFN RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MAX17080GTL+T | 功能描述:开关变换器、稳压器与控制器 Integrated Circuits (ICs) Voltage Regulators - Special Purpose - IC CONTROLLER AMD SVI 40-TQFN RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MAX17081EVKIT+ | 功能描述:电源管理IC开发工具 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 |
| MAX17081EWV+ | 功能描述:电池管理 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX17081EWV+T | 功能描述:电池管理 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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