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參數(shù)資料
| 型號(hào)： | ISL8009 |
| 廠商： | Intersil Corporation |
| 英文描述： | 1.5A Low Quiescent Current 1.6MHz High Efficiency Synchronous Buck Regulator(1.5A低靜態(tài)電流，1.6MHz高效同步降壓調(diào)節(jié)器) |
| 中文描述： | 1.5A的低靜態(tài)電流1.6MHz的高效率同步降壓穩(wěn)壓器（1.5A的低靜態(tài)電流，1.6MHz的高效同步降壓調(diào)節(jié)器） |
| 文件頁(yè)數(shù)： | 11/13頁(yè) |
| 文件大?。?/td> | 763K |
| 代理商： | ISL8009 |
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11
FN6441.0
July 11, 2007
same period of time after RSI comes back to LOW. The
output voltage is unaffected. (Please refer to Figure 33).
When the function is not used, connect RSI to ground and
leave the pull-up resistor, R4, open at the POR pin.
The POR output also serves as a 200ms delayed Power
Good signal when the pull-up resistor, R
4,
is installed. The
RSI pin needs to be directly (or indirectly through resistor,
R
5
) connected to ground for this to function properly.
UVLO
When the input voltage is below the under-voltage 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 power MOSFETs are optimized for best efficiency. The
on-resistance for the P-MOSFET is typically 120m
Ω
and the
on-resistance for the N-MOSFET is typically 110m
Ω
.
Duty Cycle
The ISL8009 features duty cycle operation to maximize the
battery life. When the battery voltage drops to a level that the
ISL8009 can no longer maintain the regulation at the output,
the regulator completely turns on the P-MOSFET. The
maximum drop out voltage under the duty-cycle operation is
the product of the load current and the on-resistance of the
P-MOSFET.
Enable
The Enable (EN) input allows the user to control the turning on
or off of 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. When the regulator is disabled, the
P-MOSFET and the N-MOSFET are turned off immediately.
The 100
Ω
soft discharge resistor from LX to GDN is
activated and pulls the output to 0V.
Thermal Shutdown
The ISL8009 has built-in thermal protection. When the
internal temperature reaches +160°C, the regulator is
completely shutdown. As the temperature drops to +130°C,
the ISL8009 resumes operation by stepping through a soft-
start-up.
Applications Information
Output Inductor and Capacitor Selection
To consider steady state and transient operation, ISL8009
typically uses a 3.3μH output inductor. Higher or lower
inductor values 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 inductor ripple current can be
expressed in Equation 1:
The inductor’s saturation current rating needs be at least
larger than the peak current. The ISL8009 protects the
typical peak current 2.1A. The saturation current needs be
over 2.4A for maximum output current application.
ISL8009 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. The
recommended minimum output capacitor values are shown
in Table 1.
In Table 1, the minimum output capacitor value is given for
different output voltages to make sure the whole converter
system is stable.
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 from flowing back to
the battery rail. A 10μF, X5R or X7R ceramic capacitor is a
good starting point for the input capacitor selection.
200ms
MIN
25ns
200ms
POR
RSI
V
O
FIGURE 33. RSI AND POR TIMING DIAGRAM
TABLE 1. OUTPUT CAPACITOR VALUE vs V
OUT
V
OUT
C
OUT
L
0.8V
10μF
1.0μH~2.2μH
1.2V
10μF
1.2μH~2.2μH
1.6V
10μF
1.8μH~2.2μH
1.8V
10μF
1.8μH~3.3μH
2.5V
10μF
1.8μH~3.3μH
3.3V
10μF
1.8μH~4.7μH
3.6V
10μF
1.8μH~4.7μH
Δ
I
V
O
--------------------------------------
1
V
O
S
---------
–
=
(EQ. 1)
ISL8009
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| ISL8010 | Monolithic 600mA Step-Down Regulator with Low Quiescent Current(低靜態(tài)電流，單片600mA降壓調(diào)節(jié)器) |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL8009A | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:1.5A Low Quiescent Current 1.6MHz High Efficiency Synchronous Buck Regulator |
| ISL8009AEVAL1Z | 功能描述:EVALUATION BOARD FOR ISL8009A RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):升壓 頻率 - 開(kāi)關(guān):3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ISL8009AIRZ-T | 功能描述:IC REG BUCK SYNC ADJ 1.5A 8DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:EZBuck™ 類型:降壓（降壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:0.8 V ~ 22.1 V 輸入電壓:3 V ~ 26 V PWM 型:電流模式 頻率 - 開(kāi)關(guān):1.5MHz 電流 - 輸出:1.8A 同步整流器:無(wú) 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WFDFN 裸露焊盤 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:8-DFN（2x2） 其它名稱:785-1276-1 |
| ISL8009AIRZ-T7A | 功能描述:IC REG BUCK SYNC ADJ 1.5A 8DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:兩者兼有 輸出數(shù):1 輸出電壓:5V，1 V ~ 10 V 輸入電壓:3.5 V ~ 28 V PWM 型:電流模式 頻率 - 開(kāi)關(guān):220kHz ~ 1MHz 電流 - 輸出:600mA 同步整流器:無(wú) 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:16-SSOP（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:16-QSOP |
| ISL8009AIRZ-TK | 功能描述:IC REG BUCK SYNC ADJ 1.5A 8DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:兩者兼有 輸出數(shù):1 輸出電壓:5V，1 V ~ 10 V 輸入電壓:3.5 V ~ 28 V PWM 型:電流模式 頻率 - 開(kāi)關(guān):220kHz ~ 1MHz 電流 - 輸出:600mA 同步整流器:無(wú) 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:16-SSOP（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:16-QSOP |
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