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| 型号： | MAX1748EUE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC DC-DC CONV TRPL LCD 16-TSSOP |
| 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： | 2.7 V ~ 5.5 V |
| 输出数： | 3 |
| 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： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 带卷 (TR) |
Triple-Output TFT-LCD
DC-DC Converters
The inductance value is then given by:
impedance requires high input capacitance, particularly
× Efficiency × (V MAIN IN(MIN) )
? V
× LIR × I MAIN(MAX) × f OSC
L =
2
V IN(MIN)
2
V (MAIN)
as the input voltage falls. Since step-up DC-DC convert-
ers act as “constant-power” loads to their input supply,
input current rises as input voltage falls. A good starting
point is to use the same capacitance value for C IN as for
Considering the typical operating circuit, the maximum
DC load current (I MAIN(MAX) ) is 200mA with a 10V output.
A 6.8μH inductance value is then chosen, based on the
above equations and using 85% efficiency and a 1MHz
operating frequency. Smaller inductance values typically
offer a smaller physical size for a given series resistance
and current rating, allowing the smallest overall circuit
dimensions. However, due to higher peak inductor
currents, the output voltage ripple (I PEAK x output filter
capacitor ESR) will be higher.
Use inductors with a ferrite core or equivalent; powder
iron cores are not recommended for use with the
MAX1748/MAX8726s’ high switching frequencies. The
inductor ’s maximum current rating should exceed
I PEAK . Under fault conditions, inductor current may
reach up to 2.0A. The MAX1748/MAX8726s’ fast cur-
rent-limit circuitry allows the use of soft-saturation
inductors while still protecting the IC.
The inductor’s DC resistance significantly affects effi-
ciency. For best performance, select inductors with
resistance less than the internal n-channel FET resis-
tance. To minimize radiated noise in sensitive applica-
tions, use a shielded inductor.
The inductor should have as low a series resistance as
C OUT . Table 1 lists suggested component suppliers.
Integrator Capacitor
The MAX1748/MAX8726 contain an internal current
integrator that improves the DC load regulation but
increases the peak-to-peak transient voltage (see the
load-transient waveforms in the Typical Operating
Characteristics ). For highly accurate DC load regula-
tion, enable the current integrator by connecting a
470pF capacitor to INTG. To minimize the peak-to-peak
transient voltage at the expense of DC regulation, dis-
able the integrator by connecting INTG to REF and
adding a 100k Ω resistor to GND.
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 ).
Table 1. Component Suppliers
possible. For continuous inductor current, the power
loss in the inductor resistance, P LR , is approximated by:
P LR ? (I MAIN x V MAIN / V IN ) 2 x R L
where R L is the inductor series resistance.
Output Capacitor
A 10μF capacitor works well in most applications. The
equivalent series resistance (ESR) of the output-filter
capacitor affects efficiency and output ripple. Output
voltage ripple is largely the product of the peak induc-
tor current and the output capacitor ESR. Use low-ESR
ceramic capacitors for best performance. Low-ESR,
surface-mount tantalum capacitors with higher capacity
may be used for load transients with high peak cur-
rents. Voltage ratings and temperature characteristics
should be considered.
Input Capacitor
The input capacitor (C IN ) in boost designs reduces the
current peaks drawn from the input supply and reduces
noise injection. The value of C IN is largely determined by
the source impedance of the input supply. High source
SUPPLIER
INDUCTORS
Coilcraft
Coiltronics
Sumida USA
Toko
CAPACITORS
AVX
Kemet
Sanyo
Taiyo Yuden
DIODES
Central
Semiconductor
International
Rectifier
Motorola
Nihon
Zetex
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
516-435-1110
310-322-3331
602-303-5454
847-843-7500
516-543-7100
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
516-435-1824
310-322-3332
602-994-6430
847-843-2798
516-864-7630
12
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