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參數(shù)資料
| 型號(hào)： | MAX8740ETB |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | TFT-LCD Step-Up DC-DC Converter |
| 中文描述： | 5.3 A SWITCHING REGULATOR, 1600 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 3 MM, 0.80 MM HEIGHT, MO-229WEED-3, TDFN-10 |
| 文件頁數(shù)： | 5/12頁 |
| 文件大?。?/td> | 341K |
| 代理商： | MAX8740ETB |
M
TFT-LCD Step-Up DC-DC Converter
_______________________________________________________________________________________
5
PIN
NAME
FUNCTION
1
COMP
Compensation Pin for Error Amplifier. Connect a series RC from COMP to ground. See the
Loop
Compensation
section for component selection guidelines.
2
FB
Feedback Pin. The FB regulation voltage is 1.24V nominal. Connect an external resistive voltage-divider
between the step-up regulator’s output (V
OUT
) and GND, with the center tap connected to FB. Place the
divider close to the IC and minimize the trace area to reduce noise coupling. Set V
OUT
according to the
Output Voltage Selection
section.
Shutdown Control Input. Drive
SHDN
low to turn off the MAX8740.
Ground. Connect pins 4 and 5 directly together.
3
SHDN
GND
4, 5
6, 7
LX
Switch Pin. LX is the drain of the internal MOSFET. Connect the inductor/rectifier diode junction to LX and
minimize the trace area for lower EMI. Connect pins 6 and 7 directly together.
8
IN
Supply Pin. Bypass IN with a minimum 1μF ceramic capacitor directly to GND.
9
FREQ
Frequency-Select Input. When FREQ is low, the oscillator frequency is set to 640kHz. When FREQ is high, the
frequency is 1.2MHz. This input has a 5μA pulldown current.
10
SS
Soft-Start Control Pin. Connect a soft-start capacitor (C
SS
) to this pin. Leave open for no soft-start. The soft-
start capacitor is charged with a constant current of 4.5μA. Full current limit is reached after t = 2.5 x
10
5
C
SS
.
The soft-start capacitor is discharged to ground when
SHDN
is low. When
SHDN
goes high, the soft-start
capacitor is charged to 0.4V, after which soft-start begins.
Pin Description
LX
LX
FB
GND
GND
FREQ
IN
COMP
SS
1
4
5
2
3
9
8
6
7
10
V
OUT
13.5V/800mA
V
IN
4.5V TO 5.5V
SHDN
MAX8740
C1
10
μ
F
6.3V
R3
10
C3
1
μ
F
C6
33nF
C4
560pF
C5
68pF
L1
2.7
μ
H
D1
R2
20k
1%
R4
47k
1%
R1
196k
1%
C2
10
μ
F
20V
C7
10
μ
F
20V
Figure 1. Typical Operating Circuit
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX8740ETB+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX8740ETB+T | 功能描述:LCD 驅(qū)動(dòng)器 TFT-LCD Step-Up DC/DC Converter RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| MAX8740ETB-T | 功能描述:LCD 驅(qū)動(dòng)器 RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| MAX8740EUB+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX8741EAI | 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel |
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