参数资料
| 型号： | ISL8036IRZ |
| 厂商： | Intersil |
| 文件页数： | 23/26页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A 24QFN |
| 标准包装： | 75 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 或 2 |
| 输出电压： | 0.8 V ~ 6 V |
| 输入电压： | 2.85 V ~ 6 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 3A |
| 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： | 24-VFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 24-QFN（4x4） |
ISL8036, ISL8036A
UVLO
When the input voltage is below the undervoltage lock out (UVLO)
output voltage ripple, the output inductor value can be increased.
The inductor ripple current can be expressed in Equation 2:
V O ? ? 1 – --------- ?
L ? f S
threshold, the regulator is disabled.
Enable
The enable (EN) input allows the user to control the turning on or
? V O ?
? V IN ?
Δ I = ---------------------------------------
(EQ. 2)
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. Then the soft start-up
begins.
Soft-start-up
The soft-start-up eliminates the inrush 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
0.5V; hence the PWM operating frequency is 1/2 of the normal
frequency.
The inductor’s saturation current rating needs be at least larger than
the peak current. The ISL8036, ISL8036A protects the typical peak
current 4.8A. The saturation current needs be over 4.8A for maximum
output current application.
ISL8036, ISL8036A uses an internal compensation network and the
output capacitor value is dependent on the output voltage. The
ceramic capacitor is recommended to be X5R or X7R. The
recommended minimum output capacitor values for the ISL8036,
ISL8036A are shown in Table 4.
TABLE 4. OUTPUT CAPACITOR VALUE vs V OUT ISL8036, ISL8036A
V OUT C OUT L
(V) (μF) (μH)
When the IC ramps up at start-up, it can't sink current even at
PWM mode, behaving like in diode emulated mode for the
soft-start time.
Discharge Mode (Soft-Stop)
When a transition to shutdown mode occurs, or the output
undervoltage fault latch is set, its output discharges to PGND
through an internal 100 Ω switch.
Power MOSFETs
0.8
1.2
1.6
1.8
2.5
3.3
3.6
2 x 22
2 x 22
2 x 22
2 x 22
2 x 22
2 x 6.8
10
1.0~2.2
1.0~2.2
1.0~2.2
1.0~3.3
1.0~3.3
1.0~4.7
1.0~4.7
R 2 x0.8V
R 3 = -----------------------------------
The power MOSFETs are optimize for best efficiency. The
ON-resistance for the P-MOSFET is typically 50m Ω and the
ON-resistance for the N-MOSFET is typical 50m Ω .
100% Duty Cycle
The ISL8036, ISL8036A features 100% duty cycle operation to
maximize the battery life. When the battery voltage drops to a
level that the ISL8036, ISL8036A can no longer maintain the
regulation at the output, the regulator completely turns on the
P-MOSFET. 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-MOSFET.
Thermal Shutdown
The ISL8036, ISL8036A has built-in thermal protection. When the
internal temperature reaches +150°C, the regulator is completely
shutdown. As the temperature drops to +125°C, the ISL8036,
ISL8036A resumes operation by stepping through a soft start-up.
Applications Information
Output Inductor and Capacitor Selection
To consider steady state and transient operation, ISL8036,
ISL8036A typically uses a 1.5μH output inductor. Higher or lower
inductor value can be used to optimize the total converter system
performance. For example, for a higher output voltage 3.3V
application, in order to decrease the inductor current ripple and
23
In Table 4, the minimum output capacitor value is given for
different output voltages to make sure the whole converter
system is stable.
Output Voltage Selection
The output voltage of the regulator can be programmed via an
external resistor divider, which is used to scale the output voltage
relative to the internal reference voltage and feed it back to the
inverting input of the error amplifier. Refer to Figure 2.
The output voltage programming resistor, R 2 (or R 5 in
Channel 2), will depend on the desired output voltage of the
regulator. The value for the feedback resistor is typically between
0 Ω and 750k Ω . Let R 2 = 124k Ω , then R 3 will be:
(EQ. 3)
V OUT – 0.8V
For better performance, add 12pF in parallel with R 2 . If the
output voltage desired is 0.8V, then leave R 3 unpopulated and
short R 2 .
Input Capacitor Selection
The main functions for 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. One 22μF X5R or X7R ceramic capacitor is a good
starting point for the input capacitor selection per channel.
FN6853.3
August 17, 2012
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