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参数资料
| 型号： | MAX1843EGI |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2.7A, 1MHz, Low-Voltage, Step-Down Regulator with Internal Synchronous Rectification in QFN Package |
| 中文描述： | 4.3 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, CQCC28 |
| 封装： | 5 X 5 MM, 0.90 MM HEIGHT, QFN-28 |
| 文件页数： | 7/13页 |
| 文件大小： | 366K |
| 代理商： | MAX1843EGI |
M
2.7A, 1MHz, Low-Voltage, Step-Down Regulator with
Internal Synchronous Rectification in QFN Package
_______________________________________________________________________________________
7
Constant-Off-Time Mode
Constant-off-time operation occurs when the current
through the PMOS switch is greater than the idle-mode
threshold current (which corresponds to a load current of
half the idle mode threshold). In this mode, the regulation
comparator turns the PMOS switch on at the end of each
off-time, keeping the device in continuous-conduction
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 approxi-
mately 4 x t
OFF
when V
OUT
< V
OUT(NOM)
/ 4.
V
CC
470pF
2.2
μ
F
1
μ
F
10
FBSEL
0.01
μ
F
FEEDBACK
SELECTION
CURRENT
SENSE
PWM LOGIC
AND
DRIVERS
SS
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
MAX1843
g
m
C
OUT
Figure 2. Functional Diagram
TOFF
COMP
V
CC
FBSEL
SHDN
IN
PGND
GND
REF
SS
LX
FB
MAX1843
R
TOFF
1
μ
F
0.01
μ
F
L
2.2
μ
F
470pF
10
INPUT
C
IN
33
μ
F
C
OUT
150
μ
F
OUTPUT
V
OUT
= +2.5V, FBSEL = V
CC
V
OUT
= +1.8V, FBSEL = REF
V
OUT
= +1.5V, FBSEL = FLOATING
Figure 1. Typical Circuit
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1845 | Dual, High-Efficiency, Step-Down Controller with Accurate Current Limit |
| MAX1845EEI | Dual, High-Efficiency, Step-Down Controller with Accurate Current Limit |
| MAX1845ETX | Dual, High-Efficiency, Step-Down Controller with Accurate Current Limit |
| MAX1848 | Replaced by TMS320VC5506 : DSP (DSP Only) for Embedded V90 Modem Solution [Not Recommended For New Designs (NRND)] 144-LQFP |
| MAX1848ETA | Replaced by TMS320VC5506 : DSP (DSP Only) for Embedded V90 Modem Solution [Not Recommended For New Designs (NRND)] 144-BGA MICROSTAR |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1843EGI+ | 制造商:Maxim Integrated Products 功能描述:2.7A, 1MHZ, INTERNAL SWITCH STEP DOWN REGULATOR - Rail/Tube |
| MAX1843EGI+T | 制造商:Maxim Integrated Products 功能描述:CONV DC-DC SGL-OUT STEP DOWN 28QFN EP - Tape and Reel |
| MAX1843EGI-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 |
| MAX1843ETI+ | 功能描述:直流/直流开关调节器 2.7A 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 |
| MAX1843ETI+T | 功能描述:直流/直流开关调节器 2.7A 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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