参数资料
| 型号： | ISL6531CB |
| 厂商： | Intersil |
| 文件页数： | 8/17页 |
| 文件大小： | 0K |
| 描述： | IC CONTROLLER INTEL 24SOIC |
| 标准包装： | 30 |
| 应用： | 控制器，Intel Pentium? III，IV |
| 输入电压： | 4.5 V ~ 5.5 V |
| 输出数： | 2 |
| 输出电压： | 2.5V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC |
| 包装： | 管件 |
ISL6531
When the V2_SD input of the ISL6531 is driven high, the
V TT regulator is placed into a “sleep” state. In the sleep state
the main V TT regulator is disabled, with both the upper and
--- ? V DDQ consumes negligible power and enables rapid
(1V/DIV )
VCC (5V)
V DDQ (2.5V)
lower MOSFETs being turned off. The V TT bus is maintained
1 2
at close to --- ? V DDQ via a low current window regulator
which drives V TT via the SENSE2 pin. Maintaining V TT at
1
2
wake-up from sleep mode without the need of softstarting
the V TT regulator. During this power down mode, PGOOD is
held LOW.
0V
V TT (1.25V)
Output Voltage Selection
The output voltage of the V DDQ regulator can be
T0
T1
T2
TIME
programmed to any level between V IN (i.e. +5V) and the
internal reference, 0.8V. An external resistor divider is used
R1 × 0.8V
FIGURE 2. SOFT-START INTERVAL
Shoot-Through Protection
A shoot-through condition occurs when both the upper
MOSFET and lower MOSFET are turned on simultaneously,
effectively shorting the input voltage to ground. To protect
the regulators from a shoot-through condition, the ISL6531
incorporates specialized circuitry which insures that
complementary MOSFETs are not ON simultaneously.
The adaptive shoot-through protection utilized by the V DDQ
regulator looks at the lower gate drive pin, LGATE1, and the
phase node, PHASE1, to determine whether a MOSFET is
ON or OFF. If PHASE1 is below 0.8V, the upper gate is
to scale the output voltage relative to the reference voltage
and feed it back to the inverting input of the error amplifier,
see Figure 3.F However, since the value of R1 affects the
values of the rest of the compensation components, it is
advisable to keep its value less than 5k ? . R4 can be
calculated based on the following equation:
R4 = --------------------------------------
V OUT1 – 0.8V
If the output voltage desired is 0.8V, simply route V DDQ back
to the FB pin through R1, but do not populate R4.
+5V
defined as being OFF. Similarly, if LGATE1 is below 0.8V, the
lower MOSFET is defined as being OFF. This method of
shoot-through protection allows the V DDQ regulator to
source current only.
VCC
D1
BOOT1
Due to the necessity of sinking current, the V TT regulator
employs a modified protection scheme from that of the
V DDQ regulator. If the voltage from UGATE2 or from
ISL6531
UGATE1
PHASE1
C4
Q1
L OUT1
V DDQ
LGATE2 to GND is less than 0.8V, then the respective
MOSFET is defined as being OFF and the other MOSFET is
LGATE1
Q2
+
C OUT1
turned ON.
Since the voltage of the lower MOSFET gates and the upper
MOSFET gate of the V TT supply are being measured to
determine the state of the MOSFET, the designer is
encouraged to consider the repercussions of introducing
external components between the gate drivers and their
FB1
COMP1
C2
C1
R2
R1
C3
R4
R3
respective MOSFET gates before actually implementing
such measures. Doing so may interfere with the shoot-
through protection.
Power Down Mode
DDRAM systems include a sleep state in which the V DDQ
voltage to the memories is maintained, but signaling is
suspended. During this mode the V TT termination voltage is
no longer needed. The only load placed on the V TT bus is
the leakage of the associated signal pins of the DDRAM and
memory controller ICs.
8
FIGURE 3. OUTPUT VOLTAGE SELECTION OF V DDQ
V TT Reference Overdrive
The ISL6531 allows the designer to bypass the internal 50%
tracking of V DDQ that is used as the reference for V TT . The
ISL6531 was designed to divide down the V DDQ voltage by
50% through two internal matched resistances. These
resistances are typically 200k ? .
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| ISL6531CB-T | 功能描述:IC CONTROLLER INTEL 24SOIC RoHS:否 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) |
| ISL6531CBZ | 功能描述:IC CONTROLLER INTEL 24SOIC 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) |
| ISL6531CBZ-T | 功能描述:IC CONTROLLER INTEL 24SOIC 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) |
| ISL6531CR | 功能描述:IC CONTROLLER INTEL 32QFN RoHS:否 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) |
| ISL6531CR-T | 功能描述:IC CONTROLLER INTEL 32QFN RoHS:否 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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