参数资料
| 型号： | ISL9105IRZ-T |
| 厂商： | Intersil |
| 文件页数： | 9/11页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.6A 8DFN |
| 产品培训模块： | 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： | 1.6MHz |
| 电流 - 输出： | 600mA |
| 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： | 标准包装 |
| 供应商设备封装： | 8-DFN（2x3） |
| 产品目录页面： | 1244 (CN2011-ZH PDF) |
| 其它名称： | ISL9105IRZ-TDKR |
ISL9105
RSI Signal
The RSI signal is an input signal, which can reset the POR
signal. As shown in the “Block Diagram” on page 7, the
power-good signal is gated by the RSI signal. When the RSI
is high, the POR signal will remain low, regardless of the
power-good signal.
Overcurrent Protection
The overcurrent protection can protect ISL9105 itself, as well
as other external components when over load condition
happens. It is realized by monitoring the CSA output with the
OCP comparator, as shown in Figure 15. The current
sensing circuit has a gain of 0.4V/A. When the CSA output
reaches 0.4V, (which means the current at P-Channel
MOSFET reaches 1A) the OCP comparator is triggered to
turn off the P-Channel MOSFET immediately.
Short-Circuit Protection
Thermal Shut Down
The ISL9105 provides built-in thermal protection. When the
internal temperature reaches +150°C, the regulator is
completely shutdown. As the temperature drops to +125°C,
the ISL9105 resumes operation by stepping through a
soft-start-up.
Applications Information
Output Inductor and Capacitor Selection
To achieve better steady state and transient operation,
ISL9105 typically uses a 4.7μH output inductor. 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. The peak-to-peak inductor
current ripple can be expressed in Equation 1:
V OUT ? ? 1 – ---------------- ?
L ? f S
ISL9105 has a Short-Circuit Protection (SCP) comparator
monitors the FB pin voltage for output short-circuit
protection. When the FB is lower than 0.2V, the SCP
comparator forces the PWM oscillator frequency to drop to
? V OUT ?
? V IN ?
Δ I = -----------------------------------------------------
(EQ. 1)
1/3 of the normal operation value. This comparator is
effective during start-up or an output short-circuit event.
UVLO
When the input voltage is below the Undervoltage Lock Out
(UVLO) threshold, the regulator is disabled.
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 output
voltage is less than 0.2V; hence the PWM operating
frequency is 1/3 of the normal frequency.
Power MOSFETs
The two power MOSFETs are optimized to achieve better
efficiency. The ON-resistance for the P-Channel MOSFET is
typically 160m Ω and the ON-resistance for the N-Channel
MOSFET is typically 140m Ω .
100% Duty Cycle Operation
The ISL9105 features 100% duty cycle operation to
In Equation 1, the inductance should consider the value with
worst case tolerances; and for switching frequency f S , the
minimum f S from the “Electrical Specifications” table on
To select the inductor, its saturation current rating should be
at least higher than the sum of the maximum output current
and ( Δ I)/2 from Equation 1.
ISL9105 uses internal compensation network and the output
capacitor value is dependant on the output voltage. The
ceramic capacitor is recommended to be X5R or X7R.
Input Capacitor Selection
The main functions of the input capacitor are to provide
decoupling of the parasitic inductance and to provide filtering
function to prevent the switching current flowing back to the
battery rail. A 10μF/6.3V ceramic capacitor (X5R or X7R) is
a good starting point for the input capacitor selection.
Output Voltage Setting Resistor Selection
The voltage divider resistors, R 2 and R 3 , shown in Figure 14
set the output voltage. The output voltage can be calculated
using Equation 2:
V O = 0.8 ? ? 1 + ------- ?
maximize the battery life. When the input voltage drops to a
level that the ISL9105 can no longer maintain the switching
regulation at the output, the P-Channel MOSFET is
? R 2 ?
? R 3 ?
(EQ. 2)
completely turned on. The maximum drop out voltage under
the 100% duty-cycle operation is the product of the load
current and the ON-resistance of the P-Channel MOSFET.
Minimum input voltage V IN under this condition is the sum of
output voltage and the voltage drop cross the output inductor
and P-Channel MOSFET.
9
where the 0.8V is the reference voltage. The voltage divider,
which consists of R 2 and R 3 , increases the quiescent current
by V O /(R 2 + R 3 ), so larger resistance is desirable. On the
other hand, the FB pin has leakage current that will cause
error in the output voltage setting. The leakage current is
typically 0.1μA. To minimize the accuracy impact on the
output voltage, select the R 3 no larger than 200k Ω .
FN6415.2
March 28, 2008
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