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参数资料
| 型号： | MAX1830EEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/13页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 3A 16QSOP |
| 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： | 1.5V，1.8V，2.5V，可调 |
| 输入电压： | 3 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-QSOP |
3A, 1MHz, Low-Voltage, Step-Down Regulators with
Synchronous Rectification and Internal Switches
MAX1830/MAX1831
3.50
3.40
MAXIMUM RECOMMENDED CONTINUOUS
OUTPUT CURRENT vs. TEMPERATURE
MAXIMUM RECOMMENDED BURST CURRENT
vs. BURST CURRENT DUTY CYCLE
3.40
3.30
3.20
3.10
3.00
2.90
2.80
2.70
3.20
3.00
2.80
T A = +85 ° C
T A = +55 ° C
2.60
2.50
2.40
0.7IN 2 OF 1-OZ COPPER
2.60
2.40
I OUT IS A 100Hz SQUARE WAVE
FROM 1A TO THE BURST CURRENT
25
35
45
55
65
75
85
0
20
40
60
80
100
TEMPERATURE ( ° C)
Figure 5. Maximum Recommended Continuous Output Current
vs. Temperature
Integrator Amplifier
An internal transconductance amplifier fine tunes the
output DC accuracy. A capacitor, C COMP , from COMP
to V CC compensates the transconductance amplifier.
For stability, choose C COMP = 470pF.
DUTY CYCLE (%)
Figure 6. Maximum Recommended Burst Current vs. Burst
Current Duty Cycle
Frequency Variation with
Output Current
The operating frequency of the MAX1830/MAX1831 is
determined primarily by t OFF (set by R TOFF ), V IN , and
V OUT as shown in the following formula:
[ t OFF ( V IN ? V PMOS NMOS ) ]
A large capacitor value maintains a constant average
output voltage but slows the loop response to changes
in output voltage. A small capacitor value speeds up
the loop response to changes in output voltage but
f PWM =
( V IN ? V OUT ? V PMOS )
+ V
decreases stability.
High-Current Thermal Considerations
High ambient temperatures can limit the maximum
current or duty factor of the output current, depending
on the total copper, are connected to the MAX1830/
MAX1831 and available airflow.
Figure 5 shows the maximum recommended continuous
output current vs. ambient temperature. Figure 6 shows
the maximum recommended output current vs. the out-
put current duty cycle at high temperatures. These fig-
ures are based on 0.7in 2 of 1oz copper in free air.
Figure 6 assumes that the output current is a square
wave with a 100Hz frequency. The duty cycle is
defined as the duration of the burst current divided by
the period of the square wave. This figure shows the
limitations for continuous bursts of output current.
Note that if the thermal limitations of the MAX1830/
MAX1831 are exceeded, it enters thermal shutdown to
prevent destructive failure.
However, as the output current increases, the voltage
drop across the NMOS and PMOS switches increases
and the voltage across the inductor decreases. This
causes the frequency to drop. The change in frequency
can be approximated with the following formula:
? f PWM = -I OUT x R PMOS / (V IN x t OFF )
where R PMOS is the resistance of the internal MOSFETs
(50m ? typ).
Circuit Layout and Grounding
Good layout is necessary to achieve the MAX1830/
MAX1831s ’ intended output power level, high efficien-
cy, and low noise. Good layout includes the use of a
ground plane, careful component placement, and cor-
rect routing of traces using appropriate trace widths.
______________________________________________________________________________________
11
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相关代理商/技术参数 |
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|---|---|
| MAX1830EVKIT | 功能描述:电源管理IC开发工具 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 |
| MAX1830EVKIT+ | 功能描述:电源管理IC开发工具 Evaluation Kit for the MAX1830 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 |
| MAX1831EEE | 功能描述:直流/直流开关调节器 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 |
| MAX1831EEE+ | 功能描述:直流/直流开关调节器 3A 1MHz Step-Down 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 |
| MAX1831EEE+T | 功能描述:直流/直流开关调节器 3A 1MHz Step-Down 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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