参数资料
型号: MAX1778EUG+
厂商: Maxim Integrated Products
文件页数: 28/39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
Table 2. MAX1881/MAX1882/MAX1884/MAX1885 Component Values (f OSC = 500kHz)
CIRCUIT 6
CIRCUIT 7
CIRCUIT 8
CIRCUIT 9
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
4.7μH
>1A
4.7μF
309k ?
49.9k ?
None
None
3.3V
9V
100mA
-5V
2mA
24V
2mA
10μH
>1A
10μF
309k ?
49.9k ?
None
None
3.3V
9V
200mA
-5V
5mA
24V
5mA
10μH
>1A
10μF
309k ?
49.9k ?
None
None
3.3V
9V
200mA
-5V
5mA
24V
5mA
10μH
>1A
20μF
309k ?
49.9k ?
20k ? *
200pF*
*R COMP and C COMP are connected between the step-up converter’s output (V MAIN ) and FB.
Table 3. Component Suppliers
Charge-Pump Input Power and
Efficiency Considerations
SUPPLIER
INDUCTORS
Coilcraft
Coiltronics
Sumida USA
TOKO
CAPACITORS
AVX
KEMET
SANYO
Taiyo Yuden
PHONE
847-639-6400
561-241-7876
847-956-0666
847-297-0070
803-946-0690
408-986-0424
619-661-6835
408-573-4150
FAX
847-639-1469
561-241-9339
847-956-0702
847-699-1194
803-626-3123
408-986-1442
619-661-1055
408-573-4159
The charge pumps in the MAX1778/MAX1880–MAX1882
provide regulated output voltages by controlling the
voltage drop across the low-side n-channel MOSFET, so
they can be modeled as linear regulators followed by an
unregulated charge pump when determining the input
power requirements and efficiency.
The charge pump only provides charge to the output
capacitor during half the period (50% duty cycle), so
the input current is a function of the number of stages
and the load current:
I SUPP = I POS ( N + 1 )
DIODES
Central
Semiconductor
International
Rectifier
Motorola
Nihon
Zetex
516-435-1110
310-322-3331
602-303-5454
847-843-7500
516-543-7100
516-435-1824
310-322-3332
602-994-6430
847-843-2798
516-864-7630
for the positive charge pump, and:
I SUPP = I POS ( N + 1 )
for the negative charge pump, where N is the number
of charge-pump stages.
The efficiency characteristics of the MAX1778/
MAX1880–MAX1882 regulated charge pumps are simi-
lar to a linear regulator. It is dominated by quiescent
current at low output currents and by the input voltage
28
Maxim Integrated
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