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参数资料
| 型号： | MAX1843 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | 2.7A, 1MHz, Low-Voltage, Step-Down Regulator with Internal Synchronous Rectification in QFN Package |
| 中文描述： | 2.7A、1MHz、低电压、降压型稳压器，内置同步整流，TQFN封装 |
| 文件页数： | 1/13页 |
| 文件大小： | 366K |
| 代理商： | MAX1843 |
M
2.7A, 1MHz, Low-Voltage, Step-Down Regulator with
Internal Synchronous Rectification in QFN Package
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
19-1986; Rev 1; 3/02
General Description
The MAX1843 constant-off-time, pulse-width modulated
(PWM) step-down DC-DC converter is ideal for use in 5V
and 3.3V to low-voltage conversion necessary in note-
book and subnotebook computers. This device features
an internal PMOS power switch and internal synchronous
rectification for high efficiency and reduced component
count. An external Schottky diode is not required. The
internal 90m
power switch and 70m
NMOS synchro-
nous-rectifier switch easily deliver continuous load cur-
rents up to 2.7A. The MAX1843 produces a preset +2.5V,
+1.8V, or +1.5V output voltage or an adjustable output
from +1.1V to V
IN
. It achieves efficiencies as high as
95%.
The MAX1843 uses a unique current-mode, constant-off-
time, PWM control scheme, which includes Idle Mode
to maintain high efficiency during light-load operation.
The programmable constant-off-time architecture sets
switching frequencies up to 1MHz, allowing the user to
optimize performance trade-offs between efficiency, out-
put switching noise, component size, and cost. The
MAX1843 features an adjustable soft-start to limit surge
currents during startup, a 100% duty-cycle mode for low
dropout operation, and a low-power shutdown mode that
disconnects the input from the output and reduces sup-
ply current below 1μA. The MAX1843 is available in a 28-
pin QFN package with an exposed backside pad.
Applications
5V or 3.3V to Low-Voltage Conversion
CPU I/O Ring
Chipset Supplies
Notebook and Subnotebook Computers
Features
o
±1% Output Accuracy
o
Up to 1MHz Switching Frequency
o
95% Efficiency
o
Internal PMOS/NMOS Switches
90m
/70m
On-Resistance at V
IN
= +4.5V
110m
/80m
On-Resistance at V
IN
= +3V
o
Output Voltage
+2.5V, +1.8V, or +1.5V Pin Selectable
+1.1V to V
IN
Adjustable
o
+3V to +5.5V Input Voltage Range
o
350μA Operating Supply Current
o
<1μA Shutdown Supply Current
o
Programmable Constant-Off-Time Operation
o
Idle Mode Operation at Light Loads
o
Thermal Shutdown
o
Adjustable Soft-Start Inrush Current Limiting
o
100% Duty Cycle During Low-Dropout Operation
o
Output Short-Circuit Protection
o
28-Pin QFN Package
PART
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
28 QFN
Ordering Information
Idle Mode is a trademark of Maxim Integrated Products.
EVALUATION KIT
AVAILABLE
MAX1843EGI
MAX1843
25
26
27
28
22
23
24
8
9
10
N
11
N
12
N
13
G
14
R
15
16
17
18
19
20
21
1
2
3
4
5
6
7
T
F
N
N
N
L
N
L
LX
IN
SS
COMP
IN
N.C.
LX
LX
PGND
V
CC
FBSEL
PGND
PGND
QFN
TOP VIEW
N.C.
S
Pin Configuration
TOFF
COMP
V
CC
FBSEL
SHDN
IN
PGND
GND
REF
SS
LX
FB
MAX1843
OUTPUT
+1.1V TO
V
IN
INPUT
+3V TO
+5.5V
0.01
μ
F
1
μ
F
2.2
μ
F
470pF
10
Typical Configuration
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1843EGI | 2.7A, 1MHz, Low-Voltage, Step-Down Regulator with Internal Synchronous Rectification in QFN Package |
| 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 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1843EGI | 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 |
| 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 |
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