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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)： | 9/13頁(yè) |
| 文件大?。?/td> | 763K |
| 代理商： | ISL8009 |
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9
FN6441.0
July 11, 2007
Block Diagram
Theory of Operation
The ISL8009 is a step-down switching regulator optimized
for battery-powered handheld applications. The regulator
operates at 1.6MHz fixed switching frequency under heavy
load condition to allow small external inductor and capacitors
to be used for minimal printed-circuit board (PCB) area. At
light load, the regulator reduces the switching frequency,
unless forced to the fixed frequency to minimize the
switching loss and to maximize the battery life. The
quiescent current when the output is not loaded is typically
only 17μA. The supply current is typically only 0.1μA when
the regulator is shutdown.
PWM Control Scheme
The ISL8009 employes the current-mode pulse-width
modulation (PWM) control scheme for fast transient
response and pulse-by-pulse current limiting. Figure 30
shows the block diagram. The current loop consists of the
oscillator, the PWM comparator COMP, the current sensing
circuit, and the slope compensation for the current loop
stability. The current sensing circuit consists of the
resistance of the P-Channel MOSFET when it is turned on
and the current sense amplifier CSA. The gain for the
current sensing circuit is typically 0.4V/A. The control
reference for the current loops comes from the error
amplifier EAMP of the voltage loop.
The PWM operation is initialized by the clock from the
oscillator. The P-Channel MOSFET is turned on at the
beginning of a PWM cycle and the current in the MOSFET
starts to ramp up. When the sum of the current amplifier CSA
and the compensation slope (0.675V/μs) reach the control
reference of the current loop, the PWM comparator COMP
sends a signal to the PWM logic to turn off the P-MOSFET
and to turn on the N-Channel MOSFET. The N-MOSFET
stays on until the end of the PWM cycle. Figure 31 shows the
typical operating waveforms during the PWM operation. The
dotted lines illustrate the sum of the compensation ramp and
the current-sense amplifier CSA output.
The output voltage is regulated by controlling the reference
voltage to the current loop. The bandgap circuit outputs a
0.8V reference voltage to the voltage control loop. The
feedback signal comes from the VFB pin. The soft-start
FIGURE 30. FUNCTIONAL BLOCK DIAGRAM
LX
+
CSA1
+
+
OCP
0.85V
0.17V
SKIP
+
+
COMP
+
CE
SSLOP
0.8V
EAMP
PWM/PFM
LOGIC
CONTROLLER
PROTECTION
DRIVER
VFB
+
0.736V
0.864V
POR
SKIP
SHUTDOWN
VIN
GND
OSCILLATOR
ZERO - CROSS
SENSING
+
BANDGAP
SCP
+
0.2V
EN
SHUTDOWN
200ms
DELAY
RSI
3pF
30pF
300k
SOFT- START
ISL8009
相關(guān)PDF資料 |
PDF描述 |
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| ISL8010IUZ | Monolithic 600mA Step-Down Regulator with Low Quiescent Current |
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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(chēng):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(lèi)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(lèi)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(lèi)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(lèi)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(lèi)型:降壓（降壓） 輸出類(lèi)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(lèi)型:表面貼裝 封裝/外殼:8-WFDFN 裸露焊盤(pán) 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:8-DFN（2x2） 其它名稱(chēng):785-1276-1 |
| ISL8009AIRZ-T7A | 功能描述:IC REG BUCK SYNC ADJ 1.5A 8DFN RoHS:是 類(lèi)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(lèi)型:降壓（降壓） 輸出類(lèi)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(lèi)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(lèi)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(lèi)型:降壓（降壓） 輸出類(lèi)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(lèi)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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