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参数资料
| 型号： | MAX1830 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Replaced by TMS320BC52 : |
| 中文描述： | 3A、1MHz、低电压、降压型稳压器，内置同步整流与开关 |
| 文件页数： | 7/13页 |
| 文件大小： | 278K |
| 代理商： | MAX1830 |
M
3A, 1MHz, Low-Voltage, Step-Down Regulators with
Synchronous Rectification and Internal Switches
_______________________________________________________________________________________
7
lation comparator turns the PMOS switch on at the end
of each off-time, keeping the device in continuous-con-
duction mode. The PMOS switch remains on until the
output is in regulation or the current limit is reached.
When the PMOS switch turns off, it remains off for the
programmed off-time (t
OFF
). To control the current
under short-circuit conditions, the PMOS switch
remains off for approximately 4 x t
OFF
when V
OUT
<
V
OUT(NOM)
/ 4.
Idle Mode
Under light loads, the devices improve efficiency by
switching to a pulse-skipping Idle Mode. Idle Mode
operation occurs when the current through the PMOS
switch is less than the Idle Mode threshold current. Idle
Mode forces the PMOS to remain on until the current
through the switch reaches the Idle Mode threshold,
thus minimizing the unnecessary switching that
degrades efficiency under light loads. In Idle Mode, the
V
CC
470pF
2.2
μ
F
1
μ
F
10
FBSEL
FEEDBACK
SELECTION
CURRENT
SENSE
PWM LOGIC
AND
DRIVERS
IN
FB
V
IN
3.0V TO 5.5V
V
OUT
LX
C
CERAMIC
PGND
TOFF
R
TOFF
GND
NOTE:
HEAVY LINES DENOTE HIGH-CURRENT PATHS.
REF
REF
SUMMING
COMPARATOR
REF
REF
COMP
SKIP
SHDN
TIMER
V
IN
CURRENT
SENSE
DIGITAL
SOFT-START
MAX1830
MAX1831
G
m
C
OUT
Figure 2. Functional Diagram
TOFF
COMP
V
CC
FBSEL
SHDN
IN
PGND
GND
REF
MAX1830
LX
FB
MAX1830
MAX1831
R
TOFF
1
μ
F
L
1.5
μ
F
2.2
μ
F
470pF
10
INPUT
OUTPUT
V
OUT
= 2.5V, FBSEL = V
CC
V
OUT
= 1.8V, FBSEL = REF
V
OUT
= 1.5V, FBSEL = FLOATING
MAX1831
V
OUT
= 2.5V, FBSEL = V
CC
V
OUT
= 3.3V, FBSEL = REF
V
OUT
= 1.5V, FBSEL = FLOATING
SUMIDA
CDRH-6D28
C
OUT
120
μ
F, 4V
Panasonic SP
C
IN
22
μ
F,
6.3V X5R
Figure 1. Typical Circuit
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1831EEE | 3A, 1MHz, Low-Voltage, Step-Down Regulators with Synchronous Rectification and Internal Switches |
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| MAX1834 | High-Efficiency Step-Up Converters with Reverse Battery Protection |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1830EEE | 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 |
| MAX1830EEE+ | 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 |
| MAX1830EEE+ | 制造商:Maxim Integrated Products 功能描述:SEMICONDUCTOR ((NW)) 制造商:Maxim Integrated Products 功能描述:IC STEP-DOWN PWM DC/DC CONVERTER QSOP-16 |
| MAX1830EEE+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 |
| MAX1830EEE-T | 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 |
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