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参数资料
| 型号： | MAX17482GTL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 37/48页 |
| 文件大小： | 0K |
| 描述： | IC CTLR PWM DUAL IMVP-6.5 40TQFN |
| 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： | 控制器，Intel IMVP-6，IMVP-6.5? |
| 输入电压： | 4.5 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 0.013 V ~ 1.5 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： | 带卷 (TR) |
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Dual-Phase, Quick-PWM Controllers for
IMVP-6+/IMVP-6.5 CPU Core Power Supplies
Light-Load Pulse-Skipping Operation
(Deeper Sleep)
When DPRSLPVR is pulled high, the MAX17021/
MAX17082/MAX17482 operate with a single-phase
pulse-skipping mode. The pulse-skipping mode
enables the driver’s zero-crossing comparator, so the
controller pulls DL1 low when it detects zero inductor
current. This keeps the inductor from discharging the
output capacitors and forces the controller to skip puls-
es under light-load conditions to avoid overcharging
the output.
During downward transitions in pulse-skipping operation,
the controller temporarily sets the OVP threshold to
default, preventing false OVP faults when the transition to
pulse-skipping operation coincides with a VID code
change. Once the error amplifier detects that the output
voltage is in regulation, the OVP threshold tracks the
selected VID DAC code. The MAX17021/MAX17082/
MAX17482 automatically use forced-PWM operation dur-
ing soft-shutdown, regardless of the DPRSLPVR and PSI
configuration.
The switching waveforms might appear noisy and asyn-
chronous when light loading activates pulse-skipping
operation, but this is a normal operating condition that
results in high light-load efficiency. Trade-offs between
PFM noise and light-load efficiency are made by vary-
ing 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.
Automatic Pulse-Skipping Switchover
In skip mode (DPRSLPVR = high), an inherent automatic
switchover to PFM takes place at light loads (Figure 9).
This switchover is affected by a comparator that trun-
cates the low-side switch on-time at the inductor cur-
rent ’s zero crossing. The zero-crossing comparator
senses the inductor current across the low-side
MOSFETs. Once V LX drops below the zero-crossing
comparator threshold (see the Electrical Characteristics
table), the comparator forces DL_ low. This mechanism
causes the threshold between pulse-skipping PFM and
nonskipping PWM operation to coincide with the
boundary between continuous and discontinuous
inductor-current operation. The PFM/PWM crossover
0
Δ i
Δ t
V BATT – V OUT
L
I PEAK
I LOAD = I PEAK /2
occurs when the load current of each phase is equal to
1/2 the peak-to-peak ripple current, which is a function
of the inductor value (Figure 9). For a battery input
ON-TIME
TIME
I LOAD ( SKIP ) = η TOTAL ? SW OUT ? ? IN OUT ?
range of 7V to 20V, this threshold is relatively constant,
with only a minor dependence on the input voltage due
to the typically low duty cycles. The total load current at
the PFM/PWM crossover threshold (I LOAD(SKIP) ) is
approximately:
? T V ? ? V - V ?
? L ? ? V IN ?
where η TOTAL is the number of active phases.
Figure 9. Pulse-Skipping/Discontinuous Crossover Point
______________________________________________________________________________________
37
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相关代理商/技术参数 |
参数描述 |
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| MAX1748EUE+T | 功能描述:直流/直流开关转换器 Triple-Output TFT LCD DC/DC Converters RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1748EUE-T | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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