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参数资料
| 型号： | MAX8739ETP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/19页 |
| 文件大小： | 0K |
| 描述： | IC DC/DC CONV W/OPAMP 20TQFN-EP |
| 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： | 1.8 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 1.8 V ~ 13 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WQFN 裸露焊盘 |
| 供应商设备封装： | 20-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
TFT, LCD, DC-DC Converter with
Operational Amplifiers
Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
—
NAME
COM
SRC
LDO
PGND
AGND
POS1
NEG1
OUT1
OUT2
NEG2
POS2
SUP
LX
IN
FREQ
FB
COMP
DEL
CTL
DRN
EP
FUNCTION
Internal High-Voltage MOSFET Switch Common Terminal
Switch Input. Source of the internal high-voltage, p-channel MOSFET. Bypass SRC to PGND with a
minimum of 0.1μF close to the pins.
Internal 5V Linear Regulator Output. This regulator powers all internal circuitry except OUT1 and OUT2
operational amplifiers. Bypass LDO to AGND with a 0.22μF or greater ceramic capacitor.
Power Ground. PGND is the source of the step-up regulator’s n-channel power MOSFET. Connect PGND
to the input capacitor ground terminals through a short, wide PC board trace. Connect PGND to analog
ground (AGND) underneath the IC.
Analog Ground. Connect AGND to power ground (PGND) underneath the IC.
Operational Amplifier 1 Noninverting Input
Operational Amplifier 1 Inverting Input
Operational Amplifier 1 Output
Operational Amplifier 2 Output
Operational Amplifier 2 Inverting Input
Operational Amplifier 2 Noninverting Input
Operational-Amplifier Supply Input. SUP is the positive supply rail for the OUT1 and OUT2 amplifiers. SUP
is also the supply input of the internal 5V linear regulator. Connect SUP to the main step-up regulator
output and bypass SUP to AGND with a 0.1μF capacitor.
n-Channel Power MOSFET Drain and Switching Node. Connect the inductor and the catch diode to LX
and minimize the trace area for lowest EMI.
Supply Voltage. IN can range from 1.8V to 5.5V.
Oscillator Frequency-Select Input. Pull FREQ low or leave it unconnected for 600kHz operation. Connect
FREQ to IN for 1.2MHz operation. This input has a 5μA pulldown.
Step-Up Regulator Feedback Input. Regulates to 1.24V (nominal). Connect a resistive voltage-divider
from the output (V MAIN ) to FB to analog ground (AGND). Place the divider within 5mm of FB.
Step-Up Regulator Error-Amplifier Compensation Point. Connect a series resistor and capacitor from
COMP to AGND. See the Loop Compensation section for component selection guidelines.
High-Voltage Switch-Delay Input. Connect a capacitor from DEL to AGND to set the high-voltage switch
startup delay. A 5μA current source charges C DEL . The switches between SRC, COM, and DRN are
disabled during the delay period.
High-Voltage Switch-Control Input. When CTL is high, the high-voltage switch between COM and SRC is
on and the high-voltage switches between COM and DRN are off. When CTL is low, the high-voltage
switch between COM and SRC is off and the high-voltage switches between COM and DRN are on. CTL
is inhibited by the undervoltage lockout and when V DEL is less than 1.24V.
Switch Input. Drain of the internal, high-voltage, back-to-back p-channel MOSFETs connected to COM.
Exposed Pad
10
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