参数资料
型号: MAX1778EUG+
厂商: Maxim Integrated Products
文件页数: 27/39页
文件大小: 0K
描述: IC DCDC CONV MULTI OUT 24TSSOP
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 62
应用: 转换器,TFT,LCD
输入电压: 2.7 V ~ 5.5 V
输出数: 5
输出电压: 2.7 V ~ 13 V
工作温度: 0°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 24-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 24-TSSOP
包装: 管件
MAX1778/MAX1880–MAX1885
Quad-Output TFT LCD DC/DC
Converters with Buffer
R TX PCH ( ON ) + R NCH ( ON ) ) + ?
= 2 ( R
? C X CHP ?
?
+ ?
? C OUT CHP ?
?
N POS ≥ ?
+ R I
? V SUPP DIODE TX LOAD ) ?
?
N NEG ≥ ?
+ R I
? V SUPN DROP TX LOAD ) ?
?
Rectifier Diode
Use a Schottky diode with an average current rating
equal to or greater than the peak inductor current, and
a voltage rating at least 1.5 times the main output volt-
age (V MAIN ).
Charge Pumps (MAX1778/ MAX1880/
MAX1881/MAX1882 Only)
Selecting the Number of Charge-Pump Stages
The number of charge-pump stages required to regu-
late the output voltage depends on the supply voltage,
output voltage, load current, switching frequency, the
diode’s forward voltage drop, and ceramic capacitor
values.
For positive charge-pump outputs, the number of
required stages can be determined by:
? V POS - V SUPD ?
- 1 . 1 ( 2 V
where V SUPD is the positive charge-pump diode supply
(Figure 4), V DIODE is the diode’s forward voltage drop,
and R TX is the charge pump’s output impedance. The
charge pump’s output impedance can be approximat-
ed using the following equation:
? 1 ?
f
? 1 ?
f
where the charge pump’s switching frequency (f CHP ) is
equal to 0.5 x f OSC , the p-channel MOSFET’s on-resis-
tance (R PCH(ON) ) is 10 ? , and the n-channel MOSFET’s
on-resistance (R NCH(ON )) is 4 ? (see the Electrical
Characteristics).
For negative charge-pump outputs, the number of
required stages can be determined by:
? V NEG ?
- 1 . 1 ( 2 V
where N NEG is rounded up to the nearest integer.
Table 1. MAX1778/MAX1880/MAX1883 Component Values (f OSC = 1MHz)
CIRCUIT 1
CIRCUIT 2
CIRCUIT 3
CIRCUIT 4
CIRCUIT 5
V IN
V MAIN
I MAIN(MAX)
V NEG
I NEG
V POS
I POS
L
I PEAK
C OUT
R1
R2
R COMP
C COMP
3.3V
9V
100mA
-5V
2mA
24V
2mA
2.2μH
>1A
4.7μF
309k ?
49.9k ?
None
None
3.3V
9V
200mA
-5V
5mA
24V
5mA
4.7μH
>1A
10μF
309k ?
49.9k ?
None
None
3.3V
9V
200mA
-5V
5mA
24V
5mA
4.7μH
>1A
20μF
309k ?
49.9k ?
39k ? *
100pF*
5V
12V
220mA
-5V
5mA
24V
5mA
6.8μH
>1A
10μF
429k ?
49.9k ?
None
None
5V
12V
220mA
-5V
5mA
24V
5mA
6.8μH
>1A
20μF
429k ?
49.9k ?
20k ? *
200pF*
*R COMP and C COMP are connected between the step-up converter’s output (V MAIN ) and FB.
Maxim Integrated
27
相关PDF资料
PDF描述
MAX5008CUB+ IC CHARGE PUMP USB 5V 10-UMAX
VI-2W4-EW-B1 CONVERTER MOD DC/DC 48V 100W
RBM36DTMS CONN EDGECARD 72POS R/A .156 SLD
500R15W104KV4T CAP CER 0.1UF 50V 10% X7R 0805
RCM40DTMH CONN EDGECARD 80POS R/A .156 SLD
相关代理商/技术参数
参数描述
MAX1778EUG+ 功能描述:直流/直流开关转换器 Quad-Output TFT LCD w/Buffer RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT
MAX1778EUG+T 功能描述:直流/直流开关转换器 Quad-Output TFT LCD w/Buffer RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT
MAX1778EUG-T 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT
MAX1778EVKIT 功能描述:电源管理IC开发工具 MAX1778/80/81/82 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V
MAX1779EUE 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT