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参数资料
| 型号： | MAX8727ETB+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/13页 |
| 文件大小： | 0K |
| 描述： | IC DC/DC CONV TFT-LCD 10-TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 2.6 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 2.6 V ~ 24 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-TDFN-EP（3x3） |
| 包装： | 带卷 (TR) |
TFT-LCD Step-Up DC-DC Converter
Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
NAME
COMP
FB
SHDN
GND
GND
LX
LX
IN
FREQ
SS
FUNCTION
Compensation Pin for Error Amplifier. Connect a series RC from COMP to ground. See the Loop
Compensation section for component selection guidelines.
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 MAX8727.
Ground. Connect pins 4 and 5 directly together.
Ground. Connect pins 4 and 5 directly together.
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.
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.
Supply Pin. Bypass IN with a minimum 1μF ceramic capacitor directly to GND.
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.
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 × 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.
L1
V IN
3.6 μ H
D1
V OUT
4.5V TO 5.5V
C1
10 μ F
6.3V
R3
10 Ω
6
LX
7
LX
R1
309k Ω
1%
C2
4.7 μ F
25V
C7
4.7 μ F
25V
C8
4.7 μ F
25V
15V/600mA
C3
1 μ F
8
9
3
IN
FREQ
SHDN
MAX8727
2
FB
GND 5
4
GND
R2
28.0k Ω
1%
C6
10
SS
COMP 1
33nF
R4
100k Ω
C5
39pF
C4
330pF
Figure 1 Typical Operating Circuit
6
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