参数资料
| 型号： | EL7641ILTZ-T7 |
| 厂商： | Intersil |
| 文件页数： | 13/19页 |
| 文件大小： | 0K |
| 描述： | IC BOOST REG DC/DC TFT-LCD 32QFN |
| 标准包装： | 1,000 |
| 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： | 5.5 V ~ 20 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
EL7640, EL7641, EL7642
V BOOST
LX
The V OFF power supply is used to power the negative
supply of the row driver in the LCD panel. The DC/DC
0.9V
LDO_ON
0.1μF
consists of an external diode-capacitor charge pump
powered from the inductor (LX) of the boost converter,
followed by a low dropout linear regulator (LDO_OFF). The
PG_LDOP
+
36V
CP (TO 36V)
LDO_OFF regulator uses an external NPN transistor as the
-
ESD
CLAMP
R BP
700 ?
DRVP
0.1μF
V ON (TO 35V)
pass element. The onboard LDO controller is a wide band
(>10MHz) transconductance amplifier capable of 5mA
output current, which is sufficient for up to 50mA or more
output current under the low dropout condition (forced beta
+
FBP
R P1
R P2
20k ?
C ON
of 10). Typical V OFF voltage supported by EL7640, EL7641
and EL7642 ranges from -5V to -25V. A fault comparator is
also included for monitoring the output voltage. The under-
-
GMP
1: Np
voltage threshold is set at 200mV above the 0.2V reference
level.
Set-up Output Voltage
V ON = V REF × ? 1 + ---------- ?
V OFF = V REFN + ---------- × ( V REFN – V REF )
R
FIGURE 19. V ON FUNCTIONAL BLOCK DIAGRAM
LX
0.1μF
CP (TO -26V)
Refer to Typical Application Diagram , the output voltages of
V ON , V OFF and V LOGIC are determined by the following
equations:
? R 12 ?
? R 11 ?
R 22
21
PG_LDON
0.4V
-
+
-
+
GMN
LDO_OFF
1: Nn
36V
ESD
CLAMP
FBN
DRVN
R BN
700 ?
V REF
R N2
20k ?
R N1
0.1μF
V OFF (TO -20V)
C OFF
Where V REF = 1.2V, V REFN = 0.2V.
High Charge Pump Output Voltage (>36V)
Applications
In the applications where the charge pump output voltage is
over 36V, an external NPN transistor needs to be inserted in
between the DRVP pin and the base of pass transistor Q3 as
shown in Figure 21, or the linear regulator can control only
one stage charge pump and regulate the final charge pump
output as shown in Figure 22.
V IN CHARGE PUMP
OR V BOOST OUTPUT
FIGURE 20. V OFF FUNCTIONAL BLOCK DIAGRAM
700 ?
The V ON power supply is used to power the positive supply
of the row driver in the LCD panel. The DC/DC consists of an
external diode-capacitor charge pump powered from the
DRVP
NPN
CASCODE
TRANSISTOR
Q11
V ON
inductor (LX) of the boost converter, followed by a low
dropout linear regulator (LDO_ON). The LDO_ON regulator
uses an external PNP transistor as the pass element. The
onboard LDO controller is a wide band (>10MHz)
transconductance amplifier capable of 5mA output current,
which is sufficient for up to 50mA or more output current
under the low dropout condition (forced beta of 10). Typical
V ON voltage supported by EL7640, EL7641 and EL7642
ranges from +15V to +36V. A fault comparator is also
included for monitoring the output voltage. The under-
voltage threshold is set at 25% below the 1.2V reference.
13
EL764X
FBP
FIGURE 21. CASCODE NPN TRANSISTOR CONFIGURATION
FOR HIGH CHARGE PUMP OUTPUT VOLTAGE
(>36V)
FN7415.2
February 22, 2006
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EL7642 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:TFT-LCD DC/DC with Integrated Amplifiers |
| EL7642AILTZ | 功能描述:LCD 驱动器 EL7642AILTZ TFT-LCD DC-DC W/INTEGRTD AMP RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| EL7642AILTZ-T13 | 功能描述:LCD 驱动器 EL7642AILTZ TFT-LCD DC-DC W/INTEGRTD AMP RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| EL7642AILTZ-T7 | 功能描述:LCD 驱动器 EL7642AILTZ TFT-LCD DC-DC W/INTEGRTD AMP RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| EL7642ILTZ | 功能描述:直流/直流开关调节器 EL7642ILZ TFT-LCD DC -DC W/INTEGRTD AMP RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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