参数资料
| 型号： | ADM8832ACPZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC CHARGE PUMP REG TFT 20LFCSP |
| 标准包装： | 1 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 2.6 V ~ 3.6 V |
| 输出数： | 3 |
| 输出电压： | -10.2V，5.1V，15.3V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-LFCSP |
| 供应商设备封装： | 20-LFCSP |
| 包装： | 托盘 |
| 配用： | ADM8832EB-EVALZ-ND - BOARD EVALUATION ADM8832 REG |
ADM8832
THEORY OF OPERATION
SCANNING AND BLANKING
A TFT LCD panel is made up of a bank of capacitors, each
representing a pixel in the display. These capacitors store
different levels of charge, depending on the amount of
luminescence required for a given pixel. When a picture is
displayed on the panel, a scan of all the pixel capacitors is
performed, placing different levels of charge on each in order to
create the image. The process of updating the display like this is
called scanning. Once scanned, an image is held by pixel
capacitance, and the controller and source line drivers can be
put into a low power mode. This low power mode is referred to
as the blanking mode on the ADM8832. Over a finite period of
time, this pixel charge will leak and the capacitors will need to
be refreshed in order to maintain the image.
The ADM8832 uses scanning and blanking modes, as follows.
When the TFT LCD panel is in scanning mode, a logic high on
the SCAN/BLANK input places the device in high current
power mode, providing extra power (extra current) to the LCD
controller and the source line drivers. If the panel continues to
be updated (as when a moving picture is being displayed), the
ADM8832 can be continually operated in scanning mode. If the
same image is kept on the panel, a logic low is applied to the
SCAN/BLANK input, and the ADM8832 enters blanking (low
current) mode. Depending on how often the image is u pdated,
TRANSIENT RESPONSE
The ADM8832 features extremely fast transient response,
making it very suitable for fast image updates on TFT LCD
panels. This means that even under changing load conditions
and Figure 13 show how the 5.1 V output responds when a
maximum load is dynamically connected and disconnected.
Note that the output settles within 5 μs to less than 1% of the
output level.
EXTERNAL CLOCK
The ADM8832 has an internal 100 kHz oscillator, but an
external clock source can also be used to clock the part. This
clock source must be applied to the CLKIN pin. Power is saved
during blanking periods by disabling the internal oscillator and
by switching to the lower frequency external clock source. To
achieve optimum performance of the charge pump circuitry, it
is important that the duty cycle of the external clock source is
50% and that the rise and fall times are less than 20 ns.
90%
10%
the ADM8832 can be operated with a variable SCAN/ BLANK
t R
t F
duty cycle. This helps to maximize power efficiency and,
therefore, extends the battery life.
POWER SEQUENCING
t H
t T
t R : RISE TIME
t F : FALL TIME
t H
@ 100% = DUTY CYCLE
t T
The gate drive supplies must be sequenced such that the ?10 V
supply is up before the +15 V supply for the TFT panel to power
Figure 18. Duty Cycle of External Clock
on correctly. The ADM8832 controls this sequence. When the
device is turned on (a logic high on SHDN), the ADM8832
allows the ?10 V output to ramp immediately, but holds off the
+15 V output. It continues to do this until the negative output
reaches ?3 V. At this point, the positive output is enabled and
VCC
SHDN
t R5V
0.280
0.400
+5V
+15V
t R15V
t R15V
90%
10%
t F5V
t F15V
–10V
90%
10%
–3V
t R10V
SOLDER MASK
0.875
0.200
0.250
LOAD
SCAN/BLANK
EXTERNAL
CLOCK
t F10V
Figure 17. Power Sequence
Rev. A | Page 10 of 12
BOARD METALLIZATION
Figure 19. Suggested LFCSP 4 mm × 4mm 20 Lead Land Pattern
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM8832ACPZ1 | 制造商:AD 制造商全称:Analog Devices 功能描述:Charge Pump Regulator for Color TFT Panel |
| ADM8832ACPZ-REEL | 功能描述:IC CHARGE PUMP REG TFT 20LFCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ADM8832ACPZ-REEL7 | 功能描述:IC CHARGE PUMP REG TFT 20LFCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ADM8832EB-EVALZ | 功能描述:BOARD EVALUATION ADM8832 REG RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ADM8839 | 制造商:AD 制造商全称:Analog Devices 功能描述:Charge Pump Regulator for Color TFT Panels |
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