参数资料
| 型号： | ISL6312AIRZ |
| 厂商： | Intersil |
| 文件页数： | 22/35页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM 4PHASE BUCK 48-QFN |
| 标准包装： | 43 |
| 应用： | 控制器，Intel VR10、VR11、AMD CPU |
| 输入电压： | 5 V ~ 12 V |
| 输出数： | 1 |
| 输出电压： | 0.38 V ~ 1.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-VFQFN 裸露焊盘 |
| 供应商设备封装： | 48-QFN（7x7） |
| 包装： | 管件 |
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ISL6312A
Initialization
Prior to initialization, proper conditions must exist on the EN,
VCC, PVCC and the VID pins. When the conditions are met,
the controller begins soft-start. Once the output voltage is
within the proper window of operation, the controller asserts
PGOOD.
In order for the ISL6312A to begin operation, PVCC1 is
the only pin that is required to have a voltage applied that
exceeds POR. However, for 2 or 3-phase operation
PVCC2 and PVCC3 must also exceed the POR
threshold. Hysteresis between the rising and falling
thresholds assure that once enabled, the ISL6312A will
not inadvertently turn off unless the PVCC bias voltage
drops substantially (see “Electrical Specifications” on
ISL6312A INTERNAL CIRCUIT
EXTERNAL CIRCUIT
VCC
page 6).
For Intel VR10, VR11 and AMD 6-bit modes of operation
these are the only conditions that must be met for the
POR
PVCC1
+ 12 V
controller to immediately begin the soft-start sequence. If
running in AMD 5-bit mode of operation there is one more
condition that must be met:
CIRCUIT
ENABLE
COMPARATOR
+
-
EN
10.7k Ω
1.40k Ω
5. The VID code must not be 11111 in AMD 5-bit mode. This
code signals the controller that no load is present. The
controller will not allow soft-start to begin if this VID code
is present on the VID pins.
Once all of these conditions are met the controller will begin
0.85V
the soft-start sequence and will ramp the output voltage up
to the user designated level.
+
EN_PH4
Intel Soft-Start
SOFT-START
AND
FAULT LOGIC
-
1.21V
The soft-start function allows the converter to bring up the
output voltage in a controlled fashion, resulting in a linear
ramp-up. The soft-start sequence for the Intel modes of
operation is slightly different then the AMD soft-start
FIGURE 10. POWER SEQUENCING USING THRESHOLD-
SENSITIVE ENABLE (EN) FUNCTION
Enable and Disable
While in shutdown mode, the PWM outputs are held in a
high-impedance state to assure the drivers remain off. The
following input conditions must be met, for both Intel and
AMD modes of operation, before the ISL6312A is released
from shutdown mode to begin the soft-start start-up
sequence:
1. The bias voltage applied at VCC must reach the internal
power-on reset (POR) rising threshold. Once this
threshold is reached, proper operation of all aspects of
the ISL6312A is guaranteed. Hysteresis between the
rising and falling thresholds assure that once enabled,
the ISL6312A will not inadvertently turn off unless the
bias voltage drops substantially (see “Electrical
Specifications” on page 6).
sequence.
For the Intel VR10 and VR11 modes of operation, the
soft-start sequence if composed of four periods, as shown in
Figure 11. Once the ISL6312A is released from shutdown
After this delay period, the VR will begin first soft-start ramp
until the output voltage reaches 1.1V VBOOT voltage. Then,
the controller will regulate the VR voltage at 1.1V for another
fixed period TD3. At the end of TD3 period, ISL6312A will
read the VID signals. If the VID code is valid, ISL6312A will
initiate the second soft-start ramp until the output voltage
reaches the VID voltage plus/minus any offset or droop
voltage.
The soft-start time is the sum of the 4 periods as shown in
Equation 17.
2. The voltage on EN must be above 0.85V. The EN input
allows for power sequencing between the controller bias
voltage and another voltage rail. The enable comparator
holds the ISL6312A in shutdown until the voltage at EN
rises above 0.85V. The enable comparator has 110mV of
hysteresis to prevent bounce.
3. The voltage on the EN_PH4 pin must be above 1.21V.
The EN_PH4 input allows for power sequencing between
the controller and the external driver.
4. The driver bias voltage applied at the PVCC pins must
reach the internal power-on reset (POR) rising threshold.
22
T SS = TD1 + TD2 + TD3 + TD4
(EQ. 17)
FN9290.5
February 1, 2011
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| ISL6312AIRZ-T | 功能描述:IC CTRLR PWM 4PHASE BUCK 48-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| ISL6312CRZ | 功能描述:IC CTRLR PWM 4PHASE BUCK 48-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
| ISL6312CRZ-T | 功能描述:IC CTRLR PWM 4PHASE BUCK 48-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL6312CRZ-TK | 功能描述:IC CTRLR PWM 4PHASE BUCK 48-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL6312CRZ-TR5312 | 功能描述:IC CTRLR PWM 4PHASE BUCK 48-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
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