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参数资料
| 型号： | MAX17582GTM+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 23/42页 |
| 文件大小： | 0K |
| 描述： | IC CTLR PWM 2PH IMVP-6.5 48-TQFN |
| 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-6.5? |
| 输入电压： | 4.5 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 0.01 V ~ 1.5 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-WFQFN 裸露焊盘 |
| 供应商设备封装： | 48-TQFN-EP（6x6） |
| 包装： | 带卷 (TR) |
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Dual-Phase, Quick-PWM Controller for
IMVP-6.5 CPU Core Power Supplies
Current Balance
The MAX17582 integrates the difference between the
current-sense voltages and adjusts the on-time of the
secondary phase to maintain current balance. The cur-
rent balance now relies on the accuracy of the current-
sense resistors instead of the inaccurate, thermally
sensitive on-resistance of the low-side MOSFETs. With
active current balancing, the current mismatch is deter-
mined by the current-sense resistor values and the offset
voltage of the transconductance amplifiers:
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
current-limit threshold. When the inductor current drops
below the negative current limit, the controller immedi-
I OS ( IBAL ) = I LMAIN - I LSEC =
V OS(IBAL )
R SENSE
ately activates an on-time pulse—DL_ turns off and
DH_ turns on—allowing the inductor current to remain
above the negative-current threshold.
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 Characteris-
tics 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-
cuit, this current-limit method is effective in almost
every circumstance.
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 MAX17582 includes a transconductance amplifier
for adding gain to the voltage-positioning sense path.
The amplifier’s input is generated by summing the cur-
rent-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 reg-
ulator’s voltage-positioned 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.
______________________________________________________________________________________
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