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| 型号： | ISL8012IRZ-T |
| 厂商： | Intersil |
| 文件页数： | 13/17页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 2A 10DFN |
| 产品培训模块： | Solutions for Test and Measurement Equipment Solutions for Industrial Control Applications |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 5.5 V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-VFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 10-DFN（3x3） |
| 产品目录页面： | 1248 (CN2011-ZH PDF) |
| 其它名称： | ISL8012IRZ-TDKR |
ISL8012
Mode Control
The ISL8012 has a MODE pin that controls the operation mode.
When the MODE pin is driven to low or shorted to ground, the
regulator operates in a forced PWM mode. The forced PWM
mode remains the fixed PWM frequency at light load instead of
entering the skip mode.
Overcurrent Protection
The overcurrent protection is realized by monitoring the CSA
output with the OCP comparator, as shown in Figure 2. The current
sensing circuit has a gain of 285mV/A, from the P-MOSFET current
to the CSA output. When the CSA output reaches 1V, which is
equivalent to 2.9A for the switch current (0.15V offset), the OCP
comparator is tripped to turn off the P-MOSFET immediately. The
overcurrent function protects the switching converter from a
shorted output by monitoring the current flowing through the
upper MOSFET.
Upon detection of overcurrent condition, the upper MOSFET will
be immediately turned off and will not be turned on again until
the next switching cycle.
Short-Circuit Protection
The short-circuit protection SCP comparator monitors the VFB pin
voltage for output short-circuit protection. When the VFB is lower
than 0.2V, the SCP comparator forces the PWM oscillator
frequency to drop to minimum value to reduce the power
dissipation. This comparator is effective during start-up or an
output short-circuit event.
RSI/PG Function
When powering up, the open-collector Power-Good output holds
low for about 1ms after V O reaches the preset voltage. When the
active-HI reset signal RSI is issued, PG goes to low immediately
and holds for the same period of time after RSI comes back to
LOW. The output voltage is unaffected. Please refer to the timing
diagram in Figure 34. When the function is not used, connect RSI
to ground and leave the pull-up resistor R 4 open at the PG pin.
The PG output also serves as a 1ms delayed Power-Good signal
when the pull-up resistor R 1 is installed. The RSI pin needs to be
directly (or indirectly through a resistor) connected to Ground for
PG to be actively monitoring the output voltage.
V O
Soft Start-Up
The soft-start-up reduces the in-rush current during the start-up.
The soft-start block outputs a ramp reference to the input of the
error amplifier. This voltage ramp limits the inductor current as
well as the output voltage speed so that the output voltage rises
in a controlled fashion. When VFB is less than 0.2V at the
beginning of the soft-start, the switching frequency is reduced to
1/3 of the nominal value so that the output can start up
smoothly at light load condition. During soft-start, the IC operates
in the SKIP mode to support pre-biased output condition.
Enable
The enable (EN) input allows the user to control the turning on or
off the regulator for purposes such as power-up sequencing.
When the regulator is enabled, there is typically a 600μs delay
for waking up the bandgap reference and then the soft-start-up
begins.
Discharge Mode (Soft-Stop)
When a transition to shutdown mode occurs or the VIN UVLO is
set, the outputs discharge to GND through an internal 100 ?
switch.
Power MOSFETs
The power MOSFETs are optimized for best efficiency. The
ON-resistance for the P-MOSFET is typically 120m ? and the
ON-resistance for the N-MOSFET is typically 110m ? .
100% Duty Cycle
The ISL8012 features 100% duty cycle operation to maximize
the battery life. When the battery voltage drops to a level that the
ISL8012 can no longer maintain the regulation at the output, the
regulator completely turns on the P-MOSFET. The maximum
dropout voltage under the 100% duty-cycle operation is the
product of the load current and the ON-resistance of the
P-MOSFET.
Thermal Shut-Down
The ISL8012 has built-in thermal protection. When the internal
temperature reaches +140°C, the regulator is completely shut
down. As the temperature drops to +115°C, the ISL8012 resumes
operation by stepping through the soft-start.
Applications Information
Output Inductor and Capacitor Selection
RSI
PG
UVLO
MIN
25ns
1ms 1ms
FIGURE 34. RSI AND PG TIMING DIAGRAM
To consider steady state and transient operations, ISL8012
typically uses a 2.2μH output inductor. The higher or lower
inductor value can be used to optimize the total converter system
performance. For example, for higher output voltage 3.3V
application, in order to decrease the inductor current ripple and
output voltage ripple, the output inductor value can be increased.
It is recommended to set the ripple inductor current
approximately 30% of the maximum output current for optimized
When the input voltage is below the undervoltage lock-out (UVLO)
threshold, the regulator is disabled.
13
December 1, 2011
FN6616.2
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相关代理商/技术参数 |
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| ISL8012IRZ-T7A | 功能描述:IC REG BUCK SYNC ADJ 2A 10DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:两者兼有 输出数:1 输出电压:5V，1 V ~ 10 V 输入电压:3.5 V ~ 28 V PWM 型:电流模式 频率 - 开关:220kHz ~ 1MHz 电流 - 输出:600mA 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:16-SSOP（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:16-QSOP |
| ISL8013 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:3A Low Quiescent Current 1MHz High Efficiency Synchronous Buck Regulator |
| ISL80136 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:40V, Low Quiescent Current, 50mA Linear Regulator |
| ISL80136IBEAJZ | 功能描述:低压差稳压器 - LDO 40V LW QUIESCENT CUR 50MALDO EP 8L (0.15) RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| ISL80136IBEAJZ-T | 制造商:Intersil Corporation 功能描述:40V, LOW QUIESCENT CURRENT, 50MA LDO, EP 8L SOIC (0.15) - Tape and Reel 制造商:Intersil Corporation 功能描述:IC REG LDO ADJ 0.05A 8SOIC 制造商:Intersil 功能描述:40V LW QUIESCENT CUR 50MALDO EP 8L0 15 |
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