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參數(shù)資料
| 型號： | ISL97702IRZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Boost with Dual Reference Outputs |
| 中文描述： | 1.2 A SWITCHING REGULATOR, 1100 kHz SWITCHING FREQ-MAX, DSO10 |
| 封裝： | 3 X 3 MM, ROHS COMPLIANT, MO-229, DFN-10 |
| 文件頁數(shù)： | 8/13頁 |
| 文件大小： | 489K |
| 代理商： | ISL97702IRZ |
8
FN7462.0
October 13, 2005
Function Overview
The ISL97702 is a high frequency, high efficiency boost
regulator which operates in constant frequency PWM mode.
The boost converter generates a stable, higher output
voltage from a variable, low voltage input source (e.g. Li-Ion
battery). Two output voltage levels are pin selectable with
values defined from the feedback resistor network.
The switching frequency is either generated from the fixed
1MHz internal oscillator or provided externally at the
synchronization pin in the range from 600kHz to 1.4MHz.
The compensation network and soft-start functions are built
in with fixed parameters without any need for further external
components.
To stop battery discharge into the output load when disabled
the inductor is disconnected from the input supply with a low
on resistance power switch.
Built in fault protection monitors inductor current and output
voltage as well as junction temperature in order to interrupt
the high current circuit path through the inductor and diode in
the event of a load failure.
Low logic input thresholds allow the ISL97702 to interface
directly to micro controllers with lower supply voltage.
Alternatively the internal pull-up resistors on all logic inputs
provide level shifting when driven from open collector outputs.
Description of Operation
Enable Pin (active low) - NEN
If NEN is high the ISL97702 shuts down all its internal
functions and deactivates its I/Os. Only the internal pull-up
resistor at NEN remains active. If NEN is high the input
disconnect switch between VDD and VDDOUT interrupts the
circuit path from the input voltage VDD through inductor and
diode to the output load at V
OUT
. If shut down the total
supply current in VDD is typically less than 0.1μA.
When NEN is driven low the ISL97702 begins with the start-
up sequence.
Start-Up Sequence
After pin NEN is pulled low or a restart is triggered from Fault
Control during operation, the ISL97702 goes through a start-
up sequence with the following six states:
Soft Inrush ->
VDDOUT Enable -> Soft Boost 25 -> Soft Boost 50 -> Soft
Boost 75 -> Normal.
If the sequence has completed, the ISL97702 stays in the
“Normal” state until NEN is high again or any fault is detected.
Soft Inrush: State Duration ~2.048ms
The switch at VDDOUT is configured as current source and
provides a limited current through the inductor to pre-charge
the capacitor at V
OUT
.
VDDOUT Enable: State Duration ~128μs
The switch at VDDOUT is fully enabled and connects the
inductor to VDD with a low on-resistance.
Soft Boost 25 -> 50 -> 75: State Duration 3x ~2.048ms
The boost regulator begins to switch at LX.
The LX current limit increases in three steps representing
25%, 50% 75% of its final value.
Normal
If no fault was detected Normal state is entered ~8.256ms
after NEN is pulled low.
The LX current limit steps up to 100%.
In all states Fault Control can force the sequence to restart
or even to shut down (see Table 1).
Pin Descriptions
PIN
NUMBER
PIN NAME
PIN FUNCTION
1
GND
Ground
2
VDDOUT
Protection Switch Output
3
VDD
Supply Input
4
NSYNC
Synchronization Input (Falling Edge)
5
FB0
Feedback Input 0
6
FB1
Feedback Input 1
7
SEL
Select Input
8
NEN
Enable Input (Active Low)
9
V
OUT
Boost Output Voltage
10
LX
Boost FET
ISL97702
相關(guān)PDF資料 |
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|---|---|
| ISL97702IRZ-T13 | Boost with Dual Reference Outputs |
| ISL97702IRZ-T7 | Boost with Dual Reference Outputs |
| ISL97801 | High Power LED Driver |
| ISL97801ARZ | High Power LED Driver |
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| ISL97702IRZ-T13 | 功能描述:IC REG BOOST ADJ 0.13A DL 10DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(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 - 開關(guān):220kHz ~ 1MHz 電流 - 輸出:600mA 同步整流器:無 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 |
| ISL97702IRZ-T7 | 功能描述:IC REG BOOST ADJ 0.13A DL 10DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(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 - 開關(guān):220kHz ~ 1MHz 電流 - 輸出:600mA 同步整流器:無 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 |
| ISL97801ARZ | 功能描述:IC LED DRIVER AUTOMOTIVE 20-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動(dòng)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:- 恒定電流:- 恒定電壓:- 拓?fù)?升壓（升壓），切換式電容器（充電泵） 輸出數(shù):1 內(nèi)部驅(qū)動(dòng)器:是 類型 - 主要:背光 類型 - 次要:白色 LED 頻率:625kHz ~ 875kHz 電源電壓:2.7 V ~ 5.3 V 輸出電壓:5V 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-µMAX 包裝:帶卷 (TR) 工作溫度:-40°C ~ 85°C |
| ISL97801ARZ-T | 功能描述:IC LED DRIVER AUTOMOTIVE 20-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動(dòng)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:- 恒定電流:- 恒定電壓:- 拓?fù)?升壓（升壓），切換式電容器（充電泵） 輸出數(shù):1 內(nèi)部驅(qū)動(dòng)器:是 類型 - 主要:背光 類型 - 次要:白色 LED 頻率:625kHz ~ 875kHz 電源電壓:2.7 V ~ 5.3 V 輸出電壓:5V 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-µMAX 包裝:帶卷 (TR) 工作溫度:-40°C ~ 85°C |
| ISL97801ARZ-TK | 功能描述:IC LED DRIVER AUTOMOTIVE 20-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動(dòng)器 系列:- 標(biāo)準(zhǔn)包裝:60 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?線性（LDO），PWM，升壓（升壓） 輸出數(shù):8 內(nèi)部驅(qū)動(dòng)器:是 類型 - 主要:背光 類型 - 次要:RGB，白色 LED 頻率:500kHz ~ 1.5MHz 電源電壓:4.75 V ~ 26 V 輸出電壓:45V 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* 工作溫度:-40°C ~ 85°C |
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