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| 型号： | MAX1843ETI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 1/13页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 2.7A 28TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 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： | 2.7A |
| 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： | 28-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
19-1986; Rev 2; 4/06
2.7A, 1MHz, Low-Voltage, Step-Down Regulator with
Internal Synchronous Rectification in TQFN Package
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 TQFN package with an exposed backside pad.
Applications
Features
? ±1% Output Accuracy
? Up to 1MHz Switching Frequency
? 95% Efficiency
? Internal pMOS/nMOS Switches
90m ? /70m ? On-Resistance at V IN = +4.5V
110m ? /80m ? On-Resistance at V IN = +3V
? Output Voltage
+2.5V, +1.8V, or +1.5V Pin Selectable
+1.1V to V IN Adjustable
? +3V to +5.5V Input Voltage Range
? 350μA Operating Supply Current
? < 1μA Shutdown Supply Current
? Programmable Constant-Off-Time Operation
? Idle Mode Operation at Light Loads
? Thermal Shutdown
? Adjustable Soft-Start Inrush Current Limiting
? 100% Duty Cycle During Low-Dropout Operation
? Output Short-Circuit Protection
? 28-Pin TQFN Package
Ordering Information
5V or 3.3V to Low-Voltage Conversion
CPU I/O Ring
Chipset Supplies
Notebook and Subnotebook Computers
TEMP
PART
RANGE
MAX1843ETI+ -40 ° C to +85 ° C
+ Denotes lead-free package.
PIN-
PACKAGE
28 TQFN
PKG
CODE
T2855-6
Typical Configuration
TOP VIEW
Pin Configuration
INPUT
+3V TO
+5.5V
10 ?
IN
LX
MAX1843 FB
OUTPUT
+1.1V TO
V IN
N.C. 22
21
20
19
18
17
16
15
14 REF
V CC
PGND
LX
23
13 GND
2.2 μ F
470pF
GND
N.C. 24
12 N.C.
SHDN
COMP
TOFF
FBSEL
REF
SS
0.01 μ F
1 μ F
LX 25
N.C. 26
SHDN 27
N.C. 28
MAX1843
11 N.C.
10 N.C.
9 FB
8 TOFF
1
2
3
4
5
6
7
Idle Mode is a trademark of Maxim Integrated Products, Inc.
TQFN
________________________________________________________________ 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
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MAX1844EEP | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1844EEP+ | 功能描述:电流型 PWM 控制器 Step-Down Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1844EEP+T | 功能描述:电流型 PWM 控制器 Step-Down Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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