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参数资料
| 型号： | ISL8022IRZ |
| 厂商： | Intersil |
| 文件页数： | 15/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ DL 12DFN |
| 标准包装： | 75 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.6 V ~ 5.5 V |
| 输入电压： | 2.8 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 2.25MHz |
| 电流 - 输出： | 2A，1.7A |
| 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： | 12-VFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 12-DFN（4x3） |
ISL8022
CLOCK
PWM
16 CYCLES
PFM
PFM CURRENT LIMIT
I L
LOAD CURRENT
0
NOMINAL +1.5 %
V OUT
NOMINAL
FIGURE 45. SKIP MODE OPERATION WAVEFORMS
Positive and Negative Overcurrent Protection
CSA1 and CSA2 are used to monitor output 1 and output 2
channels respectively. The overcurrent protection is realized by
monitoring the CSA_ output with the OCP threshold logic, as
shown in the “Block Diagram” on page 3. The current sensing
circuit has a gain of 0.32V/A, from the P-MOSFET current to the
CSA_ output. When the CSA_ output reaches the threshold of
1.25V for Channel 1 and 1.1V for Channel 2, 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 MOSFETs.
Upon detection of an overcurrent condition, the upper MOSFET
will be immediately turned off and will not be turned on again
until the next switching cycle. Upon detection of the initial
overcurrent condition, the Overcurrent Fault Counter is set to 1
and the Overcurrent Condition Flag is set from LOW to HIGH. If,
on the subsequent cycle, another overcurrent condition is
detected, the OC Fault Counter will be incremented. If there are
seventeen sequential OC fault detections, the regulator will be
shut down under an Overcurrent Fault Condition. An Overcurrent
Fault Condition will result with the regulator attempting to restart
in a hiccup mode with the delay between restarts being 4 soft-
start periods. At the end of the fourth soft-start wait period, the
fault counters are reset and soft-start is attempted again. If the
overcurrent condition goes away prior to the OC Fault Counter
reaching a count of four, the Overcurrent Condition Flag will set
back to LOW.
In the event that the inductor current reaches -1.6A, the part
enters Negative Overcurrent Protection. At this point, all
switching stops and the part enters tri-state mode while the pull-
down FET is discharging the output until it reaches normal
regulation voltage, then the IC restarts switching.
PG
The power-good signal (PG), monitors both of the output
channels. When powering up, the open-collector Power-On-Reset
output holds low for about 1ms after V O1 and V O2 reaches the
preset voltages. The PG output also serves as a 1ms delayed
power-good signal. If one of the outputs is disabled, then PG only
monitors the active channels. There is an internal 1M Ω pull-up
resistor.
15
UVLO
When the input voltage is below the undervoltage lock-out (UVLO)
threshold, the regulator is disabled.
Enable
The enable (EN1, EN2) input allows the user to control the turning
on or off the regulator for purposes such as power-up
sequencing. The regulator is enabled, there is typically a 600μs
delay for waking up the bandgap reference and the soft start-up
begins.
Soft Start-Up
The soft start-up eliminates the in-rush current during the
start-up. The soft-start block outputs a ramp reference to both
the voltage loop and the current loop. The two ramps limit the
inductor current rising speed as well as the output voltage speed
so that the output voltage rises in a controlled fashion. At the
very beginning of the start-up, the feedback voltage is less than
0.2V; hence the PWM operating frequency is 1/3 of the normal
frequency. In forced PWM mode, the IC will continue to start-up in
PFM mode to support pre-biased load applications.
Discharge Mode (Soft-Stop)
When a transition to shutdown mode occurs, or the output
undervoltage fault latch is set, the outputs discharge to GND
through an internal 100 Ω switch.
Power MOSFETs
The power MOSFETs are optimized for best efficiency. The ON-
resistance for the P-MOSFET is typically 100m Ω and the ON-
resistance for the N-MOSFET is typical 90m Ω .
100% Duty Cycle
The ISL8022 features 100% duty cycle operation to maximize
the battery life. When the battery voltage drops to a level that the
ISL8022 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.
FN7650.3
March 14, 2013
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