ADM8845: Charge Pump Driver for 6 White LED LCD Backlights
The ADM8845 provides the power required to drive up to 6 white LEDs from a 2.6 V to 5.5 V (li-ion) input supply, using charge pump technology. The white LEDs are used for backlighting a color LCD ...More
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ADM8845: Charge Pump Driver for 6 White LED LCD Backlights
Product Description
The ADM8845 provides the power required to drive up to 6 white LEDs from a 2.6 V to 5.5 V (li-ion) input supply, using charge pump technology. The white LEDs are used for backlighting a color LCD display. To maximize power efficiency, a charge pump that can operate in either of a 1x, 1.5x or 2x mode is used. The Charge Pump automatically switches between 1x/1.5x/2x modes based on the input voltage, to maintain correct output levels at a high power efficiency.
Improved brightness matching of the white LEDs is achieved by the use of a feedback pin to sense each individual LED current with a maximum matching accuracy of 1% and ISET to ILED maximum matching of 1%.
The ADM8845 provides two digital input control pins, CTRL1 and CTRL2, which control the shutdown operation and the brightness of the LEDs. The LEDs are arranged into two groups, main and sub display options, the main display refers to 4 of the 6 LEDs (FB1 -FB4) and the sub display refers to the remaining 2 LEDs (FB5 - FB6). Brightness control of the white LEDs can be achieved with a digital PWM signal applied to CTRL1 and/or CTRL2 to provide brightness control on the main and/or sub displays. The duty cycle of the applied digital PWM signal determines the brightness of the backlight white LEDs. Also brightness control of the white LEDs can be controlled using a DC voltage or a PWM signal applied to the ISET pin with a few external components added.
The ADM8845 also has soft-start circuitry to limit inrush current flow at power up.
The ADM8845 is fabricated using CMOS technology for minimal power consumption. The part is packaged in a 16-pin LFCSP package.
Features
- Drives 6 White LEDs from a 2.6 V to 5.5 V (li-ion) Input Supply
- 1x/1.5x/2x Fractional Charge Pump to Maximise Power Efficiency
- 1% LED Current Matching (Max Error)
- Up to 88% Power Efficiency
- Powers Main and Sub Displays LEDs
- Package Footprint only 9mm2 (3mm x 3mm)
- Package Height only 0.9mm
- Low Power Shutdown Mode
- Shutdown Function
- Soft-start limiting inrush current
Diagrams
- Enlarge
- Другие диаграммы
- Обозначения и трафареты для печатной платы
Functional Block Diagram for ADM8845
Charge Pump Driver for 6 White LED LCD Backlights
Другие диаграммы для ADM8845
Charge Pump Driver for 6 White LED LCD Backlights
ADM8845 Pin Diagram
Functional Block Diagram for ADM8845
ADP5520 - Backlight Driver with I/O Expander
| Part# | Input Voltage Range (Vcc) | Vout Adjust Options | Iout (max) (A) | Switching Frequency (MHz) | Package | Price* (1000-4999) |
|---|---|---|---|---|---|---|
| ADM8843 | 2.6 to 5.5V | - | 20 | - | 16-CSP | $0.50 |
| ADM8845 | 2.6 to 5.5V | - | 30 | - | 16-CSP | $0.71 |
| ADP1610 | 2.5 to 5.5 V | Vin to 12 V | 1.2 | 1.2 | 8-MSOP | $1.27 |
| ADP1611 | 2.5 to 5.5 V | Vin to 20 V | 1.2 | 1.2 | 8-MSOP | $1.14 |
| ADP1653 | 2.75 to 5.5 V | - | 2.1 | 1.2 | 16-LFCSP | $1.47 |
* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S.
Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.
ADM8845 Model Options
| Модели | Статус | Корпуса | Pins | Температурный диапазон |
Цена* (1000 pcs.) |
Production** Availability |
ROHS Compilant | Samples Cart | Purchase Cart |
|---|---|---|---|---|---|---|---|---|---|
| ADM8845ACP-REEL | Prodn | 16 ld LFCSP (3x3mm, 1.3mm exposed pad) | 16 | Ind | $ 0,71 | - |
N
Material Declaration |
Обратная связь | Обратная связь |
| ADM8845ACP-REEL7 | Prodn | 16 ld LFCSP (3x3mm, 1.3mm exposed pad) | 16 | Ind | $ 0,71 | 10/10/2008 |
N
Material Declaration |
Add To Cart | Add To Cart |
| ADM8845ACPZ-REEL | Prodn | 16 ld LFCSP (3x3mm, 1.3mm exposed pad) | 16 | Ind | $ 0,71 | - |
Y
Material Declaration |
Обратная связь | Обратная связь |
| ADM8845ACPZ-REEL7 | Prodn | 16 ld LFCSP (3x3mm, 1.3mm exposed pad) | 16 | Ind | $ 0,71 | 10/10/2008 |
Y
Material Declaration |
Add To Cart | Add To Cart |
| ADM8845EB-EVALZ | Prodn | EVALUATION BOARDS | - | TBD | $ 151,80 | 12/05/2008 | Y | Обратная связь | Add To Cart |
Help
- "Pre-Release": модель микросхемы еще не запущена в серийное производство, однако можно получить образцы.
- Производство: модель производится, доступна для покупки и заказа образцов.
- Завершение продаж: запланировано снятие модели микросхемы с производства, но в течение некоторого ограниченного времени покупка еще возможна.
- Снято с производства: Микросхема снята с производства и не доступна для приобретения. Другие варианты, указанные в таблице, все еще производятся (если их статус любой, кроме "снято с производства")
Для более подробного описания корпуса и материалов - см. Package Site
- Коммерческое исполнение: 0…70°С
- Военное исполнение: от -55 до +125 градусов по Цельсию
- Индустриальное исполнение: диапазоны рабочих температур могут быть разные у разных моделей. См. техническое описание (datasheet)
- Automotive: -40 to +125 °С
Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.
*Приведенные цены действительны в США и указаны только для примерного бюджетного рассчета. Цены указаны в долларах США (за штуку в указанном размере партии) и могут быть изменены. Цены в других регионах могут отличаться в зависимости от местных пошлин, налогов, сборов и курсов валют. Для уточнения стоимости обращайтесь в местные офисы продаж Analog Devices, или к официальным дистрибьюторам. Цены на оценочные платы и наборы указаны за штуку независимо от количества.
**Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.


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