参数资料
| 型号： | ISL78211ARZ |
| 厂商： | Intersil |
| 文件页数： | 12/35页 |
| 文件大小： | 0K |
| 描述： | IC REG 1PHASE BUCK 40QFN |
| 标准包装： | 50 |
| 应用： | 转换器，Intel IMVP-6 |
| 输入电压： | 5 V ~ 21 V |
| 输出数： | 1 |
| 输出电压： | 0.3 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-VFQFN 裸露焊盘 |
| 供应商设备封装： | 40-QFN（6x6） |
| 包装： | 管件 |
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ISL78211
Theory of Operation
The ISL78211 is a single-phase regulator implementing Intel ?
IMVP-6 ? protocol and includes an integrated gate driver for
reduced system cost and board area. The ISL78211 IMVP-6 ?
VDD
solution provides optimum steady state and transient
VR_ON
10mV/μs
performance for microprocessor core voltage regulation
applications up to 25A. Implementation of Diode Emulation
100μs
20mV
V BOOT
Mode (DEM) operation further enhances system efficiency.
The heart of the ISL78211 is the patented R 3 Technology?,
Intersil’s Robust Ripple Regulator modulator. The R 3 ? modulator
SOFT AND VO
2mV/μs
13xTs
combines the best features of fixed frequency and hysteretic
PWM controllers while eliminating many of their shortcomings.
The ISL78211 modulator internally synthesizes an analog of the
inductor ripple current and uses hysteretic comparators on those
signals to establish PWM pulses. Operating on the large-
amplitude and noise-free synthesized signals allows the
ISL78211 to achieve lower output ripple and lower phase jitter
than either conventional hysteretic or fixed frequency PWM
controllers. Unlike conventional hysteretic converters, the
ISL78211 has an error amplifier that allows the controller to
maintain 0.5% voltage regulation accuracy throughout the VID
range from 0.75V to 1.5V.
The hysteretic window voltage is with respect to the error
amplifier output. Therefore, the load current transient results in
increased switching frequency, which gives the R 3 ? regulator a
faster response than conventional fixed frequency PWM
regulators.
Start-up Timing
With the controller’s VDD pin voltage above the POR threshold,
the start-up sequence begins when VR_ON exceeds the 3.3V
logic HIGH threshold. In approximately 100 μ s, SOFT and VO start
ramping to the boot voltage of 1.2V. At start-up, the regulator
always operates in Continuous Current Mode (CCM), regardless
of the control signals. During this interval, the SOFT cap is
charged by a 41μA current source. If the SOFT capacitor is 20nF,
the SOFT ramp will be 2mV/μs for a soft-start time of 600μs.
Once VO is within 20mV of the boot voltage the ISL78211 will
count 13 clock cycles, then pull CLK_EN# low, and
charge/discharge the SOFT cap with approximately 200μA,
therefore VO slews at 10mV/μs to the voltage set by the VID pins.
In approximately 7ms, PGOOD is asserted HIGH. Figure 4 shows
typical start-up timing.
Static Operation
After the start-up sequence, the output voltage will be regulated
to the value set by the VID inputs per Table 1, which is presented
in the lntel ? IMVP-6 ? specification. The ISL78211 regulates the
output voltage with ±0.5% accuracy over the range of 0.7V to
1.5V.
CLK_EN#
~7ms
IMVP-VI PGOOD
FIGURE 4. SOFT-START WAVEFORMS USING A 20nF SOFT
CAPACITOR
A true differential amplifier remotely senses the core voltage to
precisely control the voltage at the microprocessor die. VSEN and
RTN pins are the inputs to the differential amplifier.
As the load current increases from zero, the output voltage
droops from the VID value proportionally to achieve the IMVP-6?
load line. The ISL78211 can sense the inductor current through
the intrinsic series resistance of the inductors, as shown in Figure
2, or through a precise resistor in series with the inductor, as
shown in Figure 3. The inductor current information is fed to the
VSUM pin, which is the non-inverting input to the droop amplifier.
The DROOP pin is the output of the droop amplifier, and DROOP-
VO voltage is a high-bandwidth analog representation of the
inductor current. This voltage is used as an input to a differential
amplifier to achieve the IMVP-6? load line, and also as the input
to the overcurrent protection circuit.
The PMON pin is the power monitor output. The voltage potential on
this pin (V PMON ) is given by V PMON = 35x(V SEN -V RTN )x(V DROOP -V O ).
Since V SEN -V RTN is the CPU voltage and V DROOP -V O represents the
inductor current, V PMON is an analog voltage indicating the power
consumed by the CPU. V PMON has high bandwidth so it represents
the instantaneous power including the pulsation caused inductor
current switching ripple. The maximum available V PMON is
approximately 3V.
When using inductor DCR current sensing, an NTC thermistor is
used to compensate the positive temperature coefficient of the
copper winding resistance to maintain the load-line accuracy.
The switching frequency of the ISL78211 controller is set by the
resistor R FSET between pins VW and COMP, as shown in Figures 2
and 3.
TABLE 1. VID TABLE FROM INTEL IMVP-6 SPECIFICATION
VID6
0
0
0
0
VID5
0
0
0
0
VID4
0
0
0
0
VID3
0
0
0
0
VID2
0
0
0
0
VID1
0
0
1
1
VID0
0
1
0
1
V O (V)
1.5000
1.4875
1.4750
1.4625
12
FN7578.1
December 4, 2013
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