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| 型号： | MAX1776EUA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/13页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 5V/ADJ 0.6A 8UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 5V，1.25 V ~ 24 V |
| 输入电压： | 4.5 V ~ 24 V |
| 频率 - 开关： | 200kHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-uMAX |
24V, 600mA Internal Switch, 100% Duty Cycle,
Step-Down Converter
Inductor series resistance affects both efficiency and
dropout voltage (see Input-Output (Dropout) Voltage ).
High series resistance limits the maximum current avail-
able at lower input voltages, and increases the dropout
voltage. For optimum performance, select an inductor
with the lowest possible DC resistance that fits in the
allotted dimensions. Some recommended component
manufacturers are listed in Table 2.
Input Capacitor
The input filter capacitor reduces peak currents drawn
from the power source and reduces noise and voltage
ripple on the input caused by the circuit ’ s switching.
The input capacitor must meet the ripple-current
requirement (I RMS ) imposed by the switching current
defined by the following equation:
I RMS = LOAD OUTPUT
? 3 × V
? 1 ?
Maximum Output Current
The MAX1776 converter ’ s output current determines
I V
V IN
? 4 V IN
? OUTPUT
?
?
the regulator ’ s switching frequency. When the convert-
er approaches continuous mode, the output voltage
falls out of regulation. For the typical application, the
maximum output current is approximately:
I LOAD(MAX) = 1/2 I LX (PEAK)(MIN)
For low-input voltages, the maximum on-time may be
reached and the load current is limited by:
I LOAD = 1/2 (V IN - V OUT ) ? 10μs / L
Output Capacitor
Choose the output capacitor to service the maximum
For most applications, nontantalum chemistries (ceram-
ic, aluminum, polymer, or OS-CON) are preferred due to
their robustness to high inrush currents typical of sys-
tems with low-impedance battery inputs. Alternatively,
connect two (or more) smaller value low-ESR capacitors
in parallel to reduce cost. Choose an input capacitor
that exhibits less than +10 ° C temperature rise at the
RMS input current for optimal circuit longevity.
Table 2. Component Suppliers
load current with acceptable voltage ripple. The output
ripple has two components: variations in the charge
stored in the output capacitor with each LX pulse, and
the voltage drop across the capacitor ’ s equivalent
series resistance (ESR) caused by the current into and
out of the capacitor:
V RIPPLE ? V RIPPLE(ESR) + V RIPPLE(C)
The output voltage ripple as a consequence of the ESR
and output capacitance is:
V RIPPLE(ESR) = ESR × I PEAK
SUPPLIER
DIODES
Central Semiconductor
Fairchild
General Semiconductor
International Rectifier
Nihon
On Semi
WEBSITE
www.centralsemi.com
www.fairchildsemi.com
www.gensemi.com
www.irf.com
www.niec.co.jp/engver2/
niec.co.jp_eg.htm
www.onsemi.com
L × ( I PEAK - I OUTPUT ) ?
?
V RIPPLE(C) =
2
V IN
? ?
2 C OUT × V OUTPUT ? V IN - V OUTPUT ?
Vishay-Siliconix
Zetex
www.vishay.com/brands/siliconix/
main.html
www.zetex.com
where I PEAK is the peak inductor current (see Inductor
CAPACITORS
Selection ). The worst-case ripple occurs at no-load.
These equations are suitable for initial capacitor selec-
tion, but final values should be set by testing a proto-
type or evaluation circuit. As a general rule, a smaller
amount of charge delivered in each pulse results in
less output ripple. Since the amount of charge deliv-
ered in each oscillator pulse is determined by the
inductor value and input voltage, the voltage ripple
increases with larger inductance, and as the input volt-
age decreases. See Table 3 for recommended capaci-
tor values and Table 2 for recommended component
manufacturers.
AVX
Kemet
Nichicon
Sanyo
Taiyo Yuden
INDUCTORS
Coilcraft
Coiltronics
Pulse Engineering
Sumida USA
Toko
www.avxcorp.com
www.kemet.com
www.nichicon-us.com
www.sanyo.com
www.t-yuden.com
www.coilcraft.com
www.cooperet.com
www.pulseeng.com
www.sumida.com
www.tokoam.com
______________________________________________________________________________________
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| MAX1776EVKIT | 功能描述:直流/直流开关转换器 Evaluation Kit for the MAX1776 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 |
| MAX1777EEI | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1777EEI+ | 功能描述:DC/DC 开关控制器 Quad-Out Main Power Sply Ctlr for Ntbk RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1777EEI+T | 功能描述:DC/DC 开关控制器 Quad-Out Main Power Sply Ctlr for Ntbk RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1777EEI-T | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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