- 您现在的位置：买卖IC网 > PDF目录13272 > MAX1676EUB (Maxim Integrated Products)IC REG BOOST SYNC FIX/ADJ 10UMAX PDF资料下载
参数资料
| 型号： | MAX1676EUB |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC FIX/ADJ 10UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 升压（升压） |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 3.3V，5V，可调 |
| 输入电压： | 0.7 V ~ 5.5 V |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 420mA |
| 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： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 10-µMAX |
| 其它名称： | Q782982 |
MAX1674/MAX1675/MAX1676
High-Efficiency, Low-Supply-Current,
Compact, Step-Up DC-DC Converters
Detailed Description
The MAX1674/MAX1675/MAX1676 compact, step-up
DC-DC converters start up with voltages as low as 0.9V
and operate with an input voltage down to 0.7V.
Consuming only 16μA of quiescent current, these
devices offer a built-in synchronous rectifier that
reduces cost by eliminating the need for an external
diode and improves overall efficiency by minimizing
losses in the circuit (see Synchronous Rectification sec-
tion for details). The internal MOSFET resistance is typi-
cally 0.3 ? , which minimizes losses. The current limit of
the MAX1674 and MAX1675 are 1A and 0.5A, respec-
tively. The MAX1675’s lower current limit allows the use
of a physically smaller inductor in space-sensitive
applications. The MAX1676 features a circuit that elimi-
nates noise due to inductor ringing. In addition, the
MAX1676 offers a selectable current limit (0.5A or 1A)
for design flexibility.
PFM Control Scheme
A unique minimum-off-time, current-limited, pulse-fre-
quency-modulation (PFM) control scheme is a key fea-
ture of the MAX1674/MAX1675/MAX1676. This scheme
combines the high output power and efficiency of a
pulse-width-modulation (PWM) device with the ultra-low
quiescent current of a traditional PFM ( Figure 1 ). There
is no oscillator; a constant-peak-current limit in the
switch allows the inductor current to vary between this
peak limit and some lesser value. At light loads, the
switching frequency is governed by a pair of one-shots
that set a typical minimum off-time (1μs) and a typical
maximum on-time (4μs). The switching frequency
depends upon the load and the input voltage, and can
range up to 500kHz. The peak current of the internal N-
channel MOSFET power switch is fixed at 1A
(MAX1674), at 0.5A (MAX1675), or is selectable
(MAX1676). Unlike conventional pulse-skipping DC-DC
converters (where ripple amplitude varies with input
voltage), ripple in these devices does not exceed the
product of the switch current limit and the filter-capaci-
tor equivalent series resistance (ESR).
Synchronous Rectification
The internal synchronous rectifier eliminates the need
for an external Schottky diode, thus reducing cost and
board space. During the cycle off-time, the P-channel
MOSFET turns on and shunts the MOSFET body diode.
MINIMUM
ZERO
OUT
0.1 μ F 47 μ F
V OUT
SHDN
OFF-TIME
ONE-SHOT
Q
TRIG
EN
CROSSING
AMPLIFIER
ONE-SHOT
P
LX
V IN
CLSEL
(MAX1676)
S
F/F
R
Q
MAX1674
N
GND
22 μ H
47 μ F
MAXIMUM
ON-TIME
ONE-SHOT
CURRENT-LIMIT
MAX1675
MAX1676
BATT
R1
200 ?
V IN
V OUT
TRIG
Q
AMPLIFIER
(MAX1676)
R3
ONE-SHOT
DAMPING
SWITCH
R5
R2
100k
LBO
ERROR
AMPLIFIER
LOW-BATTERY
REFERENCE
FB
REF
R6
R4
LBI
COMPARATOR
0.1 μ F
Figure 1. Simplified Functional Diagram
Maxim Integrated
7
相关PDF资料 |
PDF描述 |
|---|---|
| NX1117C15Z,115 | IC REG LDO 1.5V 1A SOT-223 |
| MAX6887HETE+ | IC SUPERVISOR HEX 16-TQFN |
| VE-J5D-EW-F4 | CONVERTER MOD DC/DC 85V 100W |
| VE-J5D-EW-F3 | CONVERTER MOD DC/DC 85V 100W |
| MAX637ACPA | IC REG INV -15V/ADJ 50MA 8DIP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1676EUB+ | 功能描述:直流/直流开关转换器 Compact Step-Up DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1676EUB+T | 功能描述:直流/直流开关转换器 Compact Step-Up DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1676EUB-T | 功能描述:直流/直流开关转换器 Compact Step-Up DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1676EVKIT | 功能描述:电源管理IC开发工具 Evaluation Kit for the MAX1676 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 |
| MAX1677EEE | 功能描述:直流/直流开关转换器 Compact Step-Up & LCD Bias DC/DC RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
发布紧急采购，3分钟左右您将得到回复。