参数资料
| 型号： | ISL9109IRZ-T |
| 厂商： | Intersil |
| 文件页数： | 10/13页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 1.5A 8DFN |
| 标准包装： | 6,000 |
| 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： | 1.6MHz |
| 电流 - 输出： | 1.5A |
| 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： | 8-VFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-DFN（2x3） |
ISL9109
Mode Selection
The MODE pin is provided on ISL9109 to select the
operation mode. When it is driven to logic low or ground, the
regulator operates in forced PWM mode. Under forced PWM
mode, the device remains at the fixed PWM operation
(typical at 1.6MHz), regardless of if the load current is high
or low.
When the MODE pin is driven to logic high or connected to
input voltage V IN , the regulator operates in either SKIP
mode or fixed PWM mode depending on the different load
conditions.
Overcurrent Protection
The overcurrent protection is provided when over load
condition happens. It is realized by monitoring the CSA output
with the OCP comparator, as shown in Figure 20. When the
current at P-Channel MOSFET is sensed to reach the current
limit, the OCP comparator is triggered to turn off the
P-Channel MOSFET immediately.
Short-Circuit Protection
As shown in Figure 20, the device has a Short-Circuit
Protection (SCP) comparator, which monitors the FB pin
voltage for output short-circuit protection. When the FB
voltage is lower than 0.2V, the SCP comparator forces the
PWM oscillator frequency to drop to 1/3 of its normal
operation frequency.
Soft Start-Up
The soft-start-up eliminates the inrush current during the
circuit 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 output
voltage is less than 0.2V; hence the PWM operating
frequency is 1/3 of the normal frequency.
Power MOSFETs
The power MOSFETs are optimized to achieve better
efficiency. The ON-resistance for the P-Channel MOSFET is
typically 0.16 Ω and the typical ON-resistance for the
N-Channel MOSFET is 0.15 Ω .
Low Dropout Operation
The ISL9109 features low dropout operation to maximize the
battery life. When the input voltage drops to a level that the
device can no longer operate under switching regulation to
maintain the output voltage, the P-Channel MOSFET is
completely turned on (100% duty cycle). The dropout
voltage under such condition is the product of the load
current and the ON-resistance of the P-Channel MOSFET.
Minimum required input voltage V IN under this condition is
the sum of output voltage plus the voltage drop cross the
inductor and the P-Channel MOSFET switch.
Thermal Shut Down
The ISL9109 provides built-in thermal protection function.
The thermal shutdown threshold temperature is typical
+160°C with typical +25°C hysteresis. When the internal
temperature is sensed to reach +150°C, the regulator is
completely shut down and as the temperature is sensed to
drop to +125°C (typical), the device resumes operation
starting from the soft-start-up.
STBY
The ISL9109 STBY pin enables the band-gap reference.
This provides a method to quickly start up the buck regulator
and ensure the output voltage reaches 93% of its nominal
value within 60μs when the EN pin is asserted. The
band-gap takes typical 600μs to bias up and stabilize. By
asserting STBY high at least 1ms prior to asserting the EN,
the device can provide a stable output when needed. A
detailed timing diagram is shown in Figure 23.
Standby mode is entered by asserting the EN pin low while
CLOCK
STBY pin is high. To achieve the specified standby operating
current, both EN and STBY pins must be asserted high for at
least 1ms after circuit start-up, before placing the device in
standby mode.
8 CYCLES
CLOCK
20% PEAK CURRENT LIMIT
I L
0 0
1.015*V OUT_NOMINAL
V OUT
V OUT
V
V OUT_NOMINAL
FIGURE 22. SKIP MODE OPERATION WAVEFORMS
10
FN6681.1
September 29, 2008
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