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参数资料
| 型号： | MAX17482GTL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 27/48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
Current Balance
The MAX17021/MAX17082/MAX17482 integrate the dif-
ference between the current-sense voltages and adjust
the on-time of the secondary phase to maintain current
balance. The current balance now relies on the accura-
cy of the current-sense resistors instead of the inaccu-
rate, thermally sensitive on-resistance of the low-side
MOSFETs. With active current balancing, the current mis-
match is determined by the current-sense resistor values
and the offset voltage of the transconductance amplifiers:
cuit, this current-limit method is effective in almost
every circumstance.
The positive valley current-limit threshold voltage at
CSP_ to CSN_ equals precisely 1/10 of the differential
TIME to ILIM voltage over a 0.1V to 0.5V range (10mV
to 50mV current-sense range). Connect ILIM directly to
V CC to set the default current-limit threshold setting of
22.5mV (typ).
The negative current-limit threshold (forced-PWM mode
only) is nominally -125% of the corresponding valley
I OS ( IBAL ) = I LMAIN - I LSEC =
V OS(IBAL )
R SENSE
current-limit threshold. When the inductor current drops
below the negative current limit, the controller immedi-
ately activates an on-time pulse—DL_ turns off, and
where R SENSE is the effective sense resistance seen at
the current-sense pins and V OS(IBAL) is the current-bal-
ance offset specification in the Electrical
Characteristics table.
The worst-case current mismatch occurs immediately
after a load transient due to inductor value mismatches
resulting in different di/dt for the two phases. The time it
takes the current-balance loop to correct the transient
imbalance depends on the mismatch between the
inductor values and switching frequency.
Current Limit
The current-limit circuit employs a unique “valley” cur-
rent-sensing algorithm that uses current-sense resistors
between the current-sense inputs (CSP_ to CSN_) as
the current-sensing elements. If the current-sense sig-
nal of the selected phase is above the current-limit
threshold, the PWM controller does not initiate a new
cycle until the inductor current of the selected phase
drops below the valley current-limit threshold. When
either phase trips the current limit, both phases are
effectively current limited since the interleaved con-
troller does not initiate a cycle with either phase.
Since only the valley current is actively limited, the actu-
al peak current is greater than the current-limit thresh-
old by an amount equal to the inductor ripple current.
Therefore, the exact current-limit characteristic and
maximum load capability are a function of the current-
sense resistance, inductor value, and battery voltage.
When combined with the undervoltage-protection cir-
DH_ turns on—allowing the inductor current to remain
above the negative-current threshold.
Carefully observe the PCB layout guidelines to ensure
that noise and DC errors do not corrupt the current-sense
signals seen by the current-sense inputs (CSP_, CSN_).
Feedback Adjustment Amplifiers
Voltage-Positioning Amplifier (Steady-State Droop)
The MAX17021/MAX17082/MAX17482 include a
transconductance amplifier for adding gain to the volt-
age-positioning sense path. The amplifier’s input is gen-
erated by summing the current-sense inputs, which
differentially sense the voltage across either current-
sense resistors or the inductor’s DCR. The amplifier’s
output connects directly to the regulator’s voltage-posi-
tioned feedback input (FB), so the resistance between
FB and the output-voltage sense point determines the
voltage-positioning gain:
V OUT = V TARGET - R FB | FB
where the target voltage (V TARGET ) is defined in the
Nominal Output-Voltage Selection section, and the FB
amplifier’s output current (I FB ) is determined by the
sum of the current-sense voltages:
η PH
I FB = G m ( FB ) ∑ V CSX
X = 1
where V CS = V CSP_ - V CSN_ is the differential current-
sense voltage, and G m(FB) is typically 600 μS as
defined in the Electrical Characteristics table.
______________________________________________________________________________________
27
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相关代理商/技术参数 |
参数描述 |
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| MAX1748EUE | 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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| 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 |
| MAX1748EUE-TG069 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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