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参数资料
| 型号： | ISL9506HRZ-T |
| 厂商： | Intersil |
| 文件页数： | 21/27页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 40-QFN |
| 标准包装： | 4,000 |
| 系列： | Robust Ripple Regulator™ (R³) |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 500kHz |
| 电源电压： | 4.75 V ~ 5.25 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -10°C ~ 100°C |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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ISL9506
section of this data sheet, PGD_N is logic level high at start-
following relationship, where R FSET is in k Ω and the
switching period is in μs.
up. When the output voltage reaches 90% of start voltage, a
counter is enabled, it counts 13 switching cycles (about 43μs
Rfset ( k Ω ) = ( Period ( μ s ) – 0.29 ) × 2.33
(EQ. 6)
for 300kHz operation) then PGD_N goes low. This in turn
triggers an internal timer for the PGOOD signal. This timer
allows PGOOD to go high approximately 7ms after PGD_N
goes low.
Static Mode of Operation - Remote Voltage
Sensing
Remote Voltage sensing allows the Voltage Regulator to
compensate for various resistive drops in the power path
and insure that the voltage seen at the point of load is the
correct level independent of load current.
The VSEN and RTN of the ISL9506 are the Kelvin
connection pins to the point of load. This allows the Voltage
Regulator to tightly control the output voltage at the point of
load, independent of layout inconsistencies and drops. This
Kelvin sense technique provides for extremely tight droop
impedance regulation.
These traces should be laid out as noise sensitive traces.
For optimum droop impedance regulation performance, the
traces connecting these two pins to the Kelvin sense point of
the load must be laid out in parallel and away from rapidly
rising voltage nodes (switching nodes) and other noisy
traces. To achieve optimum performance, place common
In discontinuous conduction mode, (DCM), the ISL9506 runs
in period stretching mode. It should be noted that the
switching frequency in the Electrical Specification Table is
tested with the error amplifier output or Comp pin voltage at
2V. When Comp pin voltage is lower, the switching
frequency will not be at the tested value but can still maintain
the output voltage ripple within specification.
Voltage Regulator Thermal Throttling
The ISL9506 features a thermal monitor which senses the
voltage change across an externally placed negative
temperature coefficient (NTC) thermistor, see Figure 45.
Proper selection and placement of the NTC thermistor
allows for detection of a designated temperature rise by the
system.
Figure 45 shows the thermal throttling feature with
hysteresis. At low temperature, SW1 is on and SW2
connects to the 1.20V side. The total current going from NTC
pin is 60μA. The voltage on NTC pin is higher than threshold
voltage of 1.20V and the comparator output is low. VRHOT#
is pulling up high by the external resistor.
mode and differential mode RC filters to analog ground on
VSEN and RTN as shown in Figure 46. However, the filter
54μA
6μA
resistors should be in order of 10 Ω so that they do not
interact with the 50k Ω input resistance of the differential
amplifier.
NTC
SW1
-
VRHOT#
Due to the fact that the voltage feedback to the switching
regulator is sensed at the point of load, there exists the
+
V NTC
-
R NTC
+
potential of an overvoltage due to an open circuit feedback
signal, should the regulator be operated without the load
installed. Due to this fact, we recommend the use of the
R OPN1 and R OPN2 connected to V OUT and ground as
R s
1.24V
SW2
1.20V
INTERNAL TO
ISL9506
shown in Figure 46. These resistors will provide voltage
feedback in the event that the system is powered up without
the load installed. These resistors are typically 100 Ω .
FIGURE 45. CIRCUITRY ASSOCIATED WITH THE THERMAL
THROTTLING FEATURE OF THE ISL9506
Setting the Switching Frequency - FSET
The R 3 modulator scheme is not a fixed frequency PWM
architecture. The switching frequency can increase during
the application of a load to improve transient performance.
However, it also varies slightly due changes in input and
output voltage and output current, but this variation is
normally less than 10% in continuous conduction mode.
Refer to Figure 39. A resistor connected between the VW
and COMP pins of the ISL9506 adjusts the switching
window, and therefore adjusts the switching frequency. The
R FSET resistor that sets up the switching frequency of the
converter operating in CCM can be determined using the
21
When temperature increases, the NTC thermistor resistance
on NTC pin decreases. The voltage on NTC pin decreases
to a level lower than 1.20V. The comparator changes polarity
and turns SW1 off and throws SW2 to 1.24V. This pulls
VRHOT# low and sends the signal to start thermal throttle.
There is a 6μA current reduction on NTC pin and 40mV
voltage increase on threshold voltage of the comparator in
this state. The VRHOT# signal will be used to change the
load operation and decrease the power consumption. When
the temperature goes down, the NTC thermistor voltage will
eventually go up. If NTC voltage increases to 1.24V, the
comparator will then be able to flip back. The external
FN6722.0
August 13, 2008
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| ISL9517HRZ | 功能描述:IC CHRGR VDC BATT 28-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| ISL9517HRZ-T | 功能描述:IC CHRGR VDC BATT 28-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
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| ISL9518AHRTZ-T | 功能描述:电池管理 TQFN ISL9518A NOTEBOOK BATRY CHRGR RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| ISL9518HRTZ | 功能描述:电池管理 TQFN ISL9518 NOTEBOOK BATRY CHRGR RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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