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| 型号： | MAX1644EAE-T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 1/11页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 2A 16SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,000 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.1 V ~ 5.5 V |
| 输入电压： | 3 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 最高 350kHz |
| 电流 - 输出： | 2A |
| 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（0.209"，5.30mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-SSOP |
ATION
AILABL
19-1457; Rev 3; 8/05
KIT
EVALU E
AV
2A, Low-Voltage, Step-Down Regulator with
Synchronous Rectification and Internal Switches
General Description
The MAX1644 constant-off-time, PWM step-down DC-
DC converter is ideal for use in applications such as PC
cards, CPU daughter cards, and desktop computer
bus-termination boards. The device features internal
synchronous rectification for high efficiency and
reduced component count. It requires no external
Schottky diode. The internal 0.10 Ω PMOS power switch
and 0.10 Ω NMOS synchronous-rectifier switch easily
deliver continuous load currents up to 2A. The
MAX1644 produces a preset +3.3V or +2.5V output
voltage or an adjustable output from +1.1V to V IN . It
achieves efficiencies as high as 95%.
The MAX1644 uses a unique current-mode, constant-
off-time, PWM control scheme, which includes an Idle
Mode? to maintain high efficiency during light-load
operation. The programmable constant-off-time archi-
tecture sets switching frequencies up to 350kHz, allow-
ing the user to optimize performance trade-offs
between efficiency, output switching noise, component
size, and cost. The device also features an adjustable
soft-start to limit surge currents during start-up, a 100%
duty cycle mode for low-dropout operation, and a low-
power shutdown mode that disconnects the input from
the output and reduces supply current below 1μA. The
MAX1644 is available in a 16-pin SSOP package.
Applications
+5V to +3.3V/+2.5V Conversion
Features
? ±1% Output Accuracy
? 95% Efficiency
? Internal PMOS and NMOS Switches
70m Ω On-Resistance at V IN = +4.5V
100m Ω On-Resistance at V IN = +3V
? Output Voltage
+3.3V or +2.5V Pin-Selectable
+1.1V to V IN Adjustable
? +3V to +5.5V Input Voltage Range
? 360μA (max) Operating Supply Current
? < 1μA Shutdown Supply Current
? Programmable Constant-Off-Time Operation
? 350kHz (max) Switching Frequency
? 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
? 16-Pin SSOP Package
Ordering Information
CPU I/O Supply
+3.3V PC Card and CardBus Applications
Notebook and Subnotebook Computers
PART
MAX1644EAE
MAX1644EAE+
TEMP RANGE
40°C to +85°C
40°C to +85°C
PIN-PACKAGE
16 SSOP
16 SSOP
Desktop Bus-Termination Boards
CPU Daughter Card Supply
+ Denotes lead-free package.
Pin Configuration
Typical Operating Circuit
TOP VIEW
INPUT
+3V TO
+5.5V
IN
V CC
LX
MAX1644 FB
PGND
OUTPUT
+1.1V TO
V IN
SHDN 1
IN 2
LX 3
IN 4
MAX1644
16 LX
15 PGND
14 LX
13 PGND
FBSEL
SS 5
12 V CC
SHDN
COMP
TOFF
GND
REF
SS
COMP 6
TOFF 7
FB 8
11 FBSEL
10 REF
9
GND
R TOFF
SSOP
Idle Mode is a trademark of Maxim Integrated Products, Inc.
A "+" SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES.
________________________________________________________________ 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 |
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| MAX1644EVKIT | 功能描述:电源管理IC开发工具 Evaluation Kit for the MAX1644 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 |
| MAX1645AEEI | 功能描述:电池管理 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX1645AEEI+T | 功能描述:电池管理 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX1645AEEI-T | 功能描述:电池管理 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX1645AEVSYS | 制造商:Maxim Integrated Products 功能描述:KIT PKG - Bulk |
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