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參數(shù)資料
| 型號： | ADM8839ACP |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Charge Pump Regulator for Color TFT Panels |
| 中文描述： | SWITCHED CAPACITOR REGULATOR, 140 kHz SWITCHING FREQ-MAX, QCC20 |
| 封裝： | 4 X 4 MM, MO-220VGGD-1, LFCSP-20 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 233K |
| 代理商： | ADM8839ACP |
REV. A
ADM8839
–7–
POWER SEQUENCING
In order for the TFT panel to power up correctly, the gate drive
supplies must be sequenced such that the –15 V supply is up
before the +15 V supply. The ADM8839 controls this sequence.
When the device is turned on (a logic high on
SHDN
), the
ADM8839 allows the –15 V output to ramp immediately but
holds off the +15 V output. It continues to do this until the
negative output has reached –3 V. At this point, the positive
output is enabled and allowed to ramp to +15 V. This sequence
is highlighted in Figure 1.
V
CC
SHDN
+5V
+15V
–15V
t
RM15V
t
FM15V
t
DELAY
10%
10%
10%
90%
90%
90%
t
F15V
t
R15V
t
F5V
t
R5V
–3V
Figure 1. Power Sequence
TRANSIENT RESPONSE
The ADM8839 features extremely fast transient response, mak-
ing it very suitable for fast image updates on TFT LCD panels.
This means that even under changing load conditions, there is
still very effective regulation of the 5 V output. TPCs 9 and 10
show how the 5 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.
BOOSTING THE CURRENT DRIVE OF THE 15 V SUPPLY
The ADM8839 15 V output can deliver 150 μA of current in
the typical configuration, as shown in Figure 2. It is also pos-
sible to draw 100 μA from the +15 V output and 200 μA from
the –15 V output, or vice versa. It is possible to draw only a
maximum of 300 μA combined from both the +15 V and the
–15 V outputs at any time (see Figure 3). In this configuration,
+5VOUT (Pin 4) is connected to +5VIN (Pin 5), as shown in
the Functional Block Diagram.
OSCILLATOR
CONTROL
LOGIC
TIMING
GENERATOR
SHUTDOWN
CONTROL
DISCHARGE
VOLTAGE
INVERTER
VOLTAGE
TRIPLER
TRIPLE
LDO
VOLTAGE
REGULATOR
VOLTAGE
DOUBLER
C1+
C1–
VOUT
LDO_IN
+5VOUT
+5VIN
C2+
C2–
C3+
C3–
+15VOUT
C4+
C4–
–15VOUT
–15V
+15V
+5V
GND
SHDN
LDO_ON/
OFF
V
CC
DOUBLE
C5, 2.2 F
C1, 2.2 F
C6, 2.2 F
C7, 2.2 F
C8, 0.22 F
C9, 0.22 F
C2, 0.22 F
C3, 0.22 F
C4, 0.22 F
ADM8839
Figure 2. Typical Configuration
I
LOAD
– A
O
14.1
14.2
14.3
14.4
14.5
14.6
14.7
14.8
14.9
15.0
15.1
50
0
100
150
200
–15V AT 25 C
+15V AT 25 C
Figure 3. +15 V/–15 V Output Voltage vs. Load
Current, Typical Configuration
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADM8839ACP-REEL | 制造商:Rochester Electronics LLC 功能描述:CHARGE PUMP REGULATOR TFT DISPLAYS I.C. - Tape and Reel 制造商:Analog Devices 功能描述: |
| ADM8839ACP-REEL7 | 制造商:Analog Devices 功能描述:Charge Pump INV/STPUP -15V/5V/15V 5mA/0.001mA/-0.001mA 20-Pin LFCSP EP T/R 制造商:Rochester Electronics LLC 功能描述:CHARGE PUMP REGULATOR TFT DISPLAYS I.C. - Tape and Reel |
| ADM8839ACPZ | 功能描述:IC CHARGE PUMP REG TFT 20LFCSP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:2,000 系列:- 應用:控制器，DSP 輸入電壓:4.5 V ~ 25 V 輸出數(shù):2 輸出電壓:最低可調(diào)至 1.2V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:30-TFSOP（0.173"，4.40mm 寬） 供應商設備封裝:30-TSSOP 包裝:帶卷 (TR) |
| ADM8839ACPZ-REEL | 功能描述:IC CHARGE PUMP REG TFT 20LFCSP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應商設備封裝:48-QFN（7x7） 包裝:管件 |
| ADM8839ACPZ-REEL7 | 功能描述:IC CHARGE PUMP REG TFT 20LFCSP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,000 系列:- 應用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應商設備封裝:42-WLP 包裝:帶卷 (TR) |
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