参数资料
| 型号： | ISL6266HRZ |
| 厂商： | Intersil |
| 文件页数： | 24/30页 |
| 文件大小： | 0K |
| 描述： | IC CORE CTRLR 2PHASE 48-QFN |
| 标准包装： | 43 |
| 应用： | 转换器，Intel IMVP-6 |
| 输入电压： | 5 V ~ 25 V |
| 输出数： | 1 |
| 输出电压： | 0.3 V ~ 1.5 V |
| 工作温度： | -10°C ~ 100°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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ISL6266, ISL6266A
For 300kHz operation, R FSET is suggested to be 9.53k Ω. In
discontinuous conduction mode (DCM), the ISL6266A runs
in period stretching mode. The switching frequency is
dependent on the load current level. In general, lighter loads
will produce lower switching frequencies. Therefore,
switching loss is greatly reduced for light load operation,
which conserves battery power in portable applications.
Voltage Regulator Thermal Throttling
lntel? IMVP-6+ technology supports thermal throttling of the
processor to prevent catastrophic thermal damage to the
voltage regulator. The ISL6266A features a thermal monitor
that senses the voltage change across an externally placed
Figure 39. T 1 represents the higher temperature point at
which the VR_TT# goes from low to high due to the system
temperature rise. T 2 represents the lower temperature point
at which the VR_TT# goes high from low because the
system temperature decreases to acceptable levels.
VR_TT#
LOGIC_1
LOGIC_0
negative temperature coefficient (NTC) thermistor.
T 2
T 1
T (°C)
Proper selection and placement of the NTC thermistor
allows for detection of a designated temperature rise by the
system.
Figure 38 shows the thermal throttling feature with
FIGURE 39. TEMPERATURE HYSTERESIS OF VR_TT#
Usually, the NTC thermistor's resistance can be
approximated by Equation 8.
b ? ? -------------------- – ----------------------- ?
hysteresis. At low temperature, SW1 is on and SW2
connects to the 1.2V side. The total current going into NTC
R NTC ( T ) = R NTCTo ? e
1 1
? T + 273 To + 273 ?
(EQ. 8)
pin is 60μA. The voltage on the NTC pin is higher than the
threshold voltage of 1.2V and the comparator output is low.
VR_TT# is pulled high by the external resistor.
T is the temperature of the NTC thermistor and b is a
parameter constant depending on the thermistor material.
T o is the reference temperature in which the approximation
is derived. The most common temperature for T o is +25°C.
54μA
6μA
For example, there are commercial NTC thermistor products
with b = 2750k Ω , b = 2600k Ω , b = 4500k Ω or b = 4250k Ω .
R NTC ( T 1 ) + R S = --------------- = 20k Ω
(EQ. 9)
+
V NTC
NTC
R NTC
SW1
-
+
VR_TT#
From the operation principle of the VR_TT# circuit
explained, the NTC resistor satisfies Equations 9 through 13:
1.2V
60 μ A
-
R NTC ( T 2 ) + R S = ---------------- = 22.96k Ω
R s
1.24V
SW2
1.24V
54 μ A
(EQ. 10)
1.20V
INTERNAL TO
ISL6266
From Equation 9 and Equation 10, Equation 11 can be
derived:
FIGURE 38. CIRCUITRY ASSOCIATED WITH THE THERMAL
R NTC ( T 2 ) – R NTC ( T 1 ) = 2.96k Ω
(EQ. 11)
THROTTLING FEATURE IN ISL6266
Using Equation 8 into Equation 11, the required nominal
NTC resistor value can be obtained by Equation 12:
b ? ? ----------------------- ?
? T + 273 ?
2.96k Ω ? e
b ? ? ? ? ?
b ? ? ? ? ?
When the temperature increases, the NTC resistor value
decreases, thus reducing the voltage on the NTC pin. When
the voltage decreases to a level lower than 1.2V, the
comparator output changes polarity and turns SW1 off and
connects SW2 to 1.24V. This pulls VR_TT# low and sends
1
o
1 1
R NTCTo = ------------------------------------------------------------------------------
----------------------- -----------------------
T 2 + 273 T 1 + 273
e – e
(EQ. 12)
the signal to start thermal throttle. There is a 6μA current
reduction on the NTC pin and 20mV voltage increase on the
threshold voltage of the comparator in this state. The
VR_TT# signal will be used to change the CPU operation
and decrease the power consumption. Temperature will
For those cases where the constant b is not accurate
enough to approximate the resistor value, the manufacturer
provides the resistor ratio information at different
temperatures. The nominal NTC resistor value may be
expressed in another way shown in Equation 13.
– Λ
decrease over time and the NTC thermistor voltage will go
up. When the NTC pin voltage achieves 1.24V, the
comparator output will resume its original state. This
temperature hysteresis feature of VR_TT# is illustrated in
24
2.96k Ω
R NTCTo = ------------------------------------------------------------------------
Λ
R NTC ( T 2 ) R NTC ( T 1 )
(EQ. 13)
FN6398.3
June 14, 2010
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6266HRZ-T | 功能描述:IC CORE CTRLR 2PHASE 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 |
| ISL6267 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Multiphase PWM Regulator for AMD Fusion Mobile CPUs |
| ISL6267EVAL1Z | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Multiphase PWM Regulator for AMD Fusion Mobile CPUs |
| ISL6267HRZ | 功能描述:电流型 PWM 控制器 MULTI-OUTPUT CNTRLR FOR AMD FUSION UP RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL6267HRZ-T | 功能描述:电流型 PWM 控制器 MULTI-OUTPUT CNTRLR FOR AMD FUSION UP RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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