参数资料
| 型号： | ISL62882IRTZ |
| 厂商： | Intersil |
| 文件页数： | 19/42页 |
| 文件大小： | 0K |
| 描述： | IC REG PWM 2PHASE BUCK 40TQFN |
| 标准包装： | 60 |
| 应用： | 控制器，Intel IMVP-6.5? |
| 输入电压： | 5 V ~ 25 V |
| 输出数： | 1 |
| 输出电压： | 0.013 V ~ 1.5 V |
| 工作温度： | -40°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（5x5） |
| 包装： | 管件 |
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ISL62882, ISL62882B
as the overshoot reduction function in 1-phase configuration, as
Table 4 shows. It is recommended to use the nominal R comp
value. The ISL62882 detects the R comp value at the beginning of
start-up, and sets the internal OCP threshold accordingly. It
remembers the R comp value until the VR_ON signal drops below
the POR threshold.
TABLE 4. ISL62882 R comp PROGRAMABILITY
The second level of overvoltage protection is different. If the output
voltage exceeds 1.55V, the ISL62882 will immediately declare an
OV fault, de-assert PGOOD, and turn on the low-side power
MOSFETs. The low-side power MOSFETs remain on until the output
voltage is pulled down below 0.85V when all power MOSFETs are
turned off. If the output voltage rises above 1.55V again, the
protection process is repeated. This behavior provides the
maximum amount of protection against shorted high-side power
R comp
2-PHASE
CONFIG.
1-PHASE CONFIG.
OVERSHOOT
MOSFETs while preventing output ringing below ground. Resetting
VR_ON cannot clear the 1.55V OVP. Only resetting V DD will clear it.
The 1.55V OVP is active all the time when the controller is enabled,
even if one of the other faults have been declared. This ensures
MIN
(k Ω )
NOMINAL
(k Ω )
MAX
(k Ω )
OCP THRESHOLD (μA)
REDUCTION
FUNCTION
that the processor is protected against high-side power MOSFET
leakage while the MOSFETs are commanded off.
none
none
40
20
Disabled
The ISL62882 has a thermal throttling feature. If the voltage on
320
210
155
400
235
165
480
260
175
45.3
41.3
36
22.7
20.7
18
the NTC pin goes below the 1.18V OT threshold, the VR_TT# pin is
pulled low indicating the need for thermal throttling to the
system. No other action is taken within the ISL62882 in response
to NTC pin voltage.
104
78
120
85
136
92
37.33
38.7
20
22.7
Enabled
Table 5 summarizes the fault protections.
TABLE 5. FAULT PROTECTION SUMMARY
62
45
66
50
70
55
42.7
44
20.7
18
FAULT TYPE
FAULT DURATION
BEFORE
PROTECTION
PROTECTION
ACTION
FAULT
RESET
The default OCP threshold is the value when R comp is not populated.
It is recommended to scale the droop current I droop such that the
default OCP threshold gives approximately the desired OCP level,
then use R comp to fine tune the OCP level if necessary.
Overcurrent
Way-Overcurrent
(2.5xOC)
Overvoltage +200mV
120μs
<2μs
1ms
PWM tri-state,
PGOOD latched
low
VR_ON
toggle or
VDD toggle
For overcurrent conditions above 2.5x the OCP level, the PWM
Undervoltage -300mV
outputs will immediately shut off and PGOOD will go low to
maximize protection. This protection is also referred to as way-
overcurrent protection or fast-overcurrent protection, for short-
circuit protections.
The ISL62882 monitors the ISEN pin voltages to determine
current-balance protection. If the ISEN pin voltage difference is
greater than 9mV for 1ms, the controller will declare a fault and
latch off.
Phase Current
Unbalance
Overvoltage 1.55V
Immediately
Low-side MOSFET VDD toggle
on until V CORE
<0.85V, then
PWM tri-state,
PGOOD latched
low.
The ISL62882 will declare undervoltage (UV) fault and latch off if
Over-Temperature
1ms
N/A
the output voltage is less than the VID set value by 300mV or
more for 1ms. It’ll turn off the PWM outputs and de-assert
PGOOD.
The ISL62882 has two levels of overvoltage protections. The first
level of overvoltage protection is referred to as PGOOD
overvoltage protection. If the output voltage exceeds the VID set
value by +200mV for 1ms, the ISL62882 will declare a fault and
de-assert PGOOD.
The ISL62882 takes the same actions for all of the above fault
protections: de-assertion of PGOOD and turn-off of the high-side
and low-side power MOSFETs. Any residual inductor current will
decay through the MOSFET body diodes. These fault conditions
can be reset by bringing VR_ON low or by bringing V DD below the
POR threshold. When VR_ON and V DD return to their high
operating levels, a soft-start will occur.
19
FN6890.4
June 21, 2011
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL62882IRTZ-T | 功能描述:直流/直流开关调节器 2 PHS PWM BUCKG FOR MICROPROC PWR SUP RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| ISL62883 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Multiphase PWM Regulator for IMVP-6.5 Mobile CPUs and GPUs |
| ISL62883BHRTZ | 功能描述:直流/直流开关调节器 3 PHS PWM BUCKG FOR MICROPROC PWR SUP RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| ISL62883BHRTZ-T | 功能描述:直流/直流开关调节器 3 PHS PWM BUCKG FOR MICROPROC PWR SUP RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| ISL62883C | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Multiphase PWM Regulator for IMVP-6.5a?￠ Mobile CPUs and GPUs |
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