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| 型号： | MAX1774EEI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/21页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ DL 28QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 1 V ~ 5.5 V |
| 输入电压： | 2.7 V ~ 28 V |
| 频率 - 开关： | 1.25MHz |
| 电流 - 输出： | 1.5A，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： | 28-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 28-QSOP |
Dual, High-Efficiency, Step-Down
Converter with Backup Battery Switchover
NOTE: FOR INPUT VOLTAGES
TO 28V SEE FIGURE 4
AND FIGURE 5
2.7V
2.7V V IN_AC
TO
5.5V
MAIN
BATTERY
D1
NDS356AP
NSD03A10
IN
INS
CVH
C5
1 μ F
TO
5.5V
R1
P1
R4
MDRV
DBI
P2
C6
10 μ F
FDS8928A
R2
R3
1M ?
ACI
LBI
MAX1774
PDRV
NDRV
N1
L1
5 μ H
R CS
MAIN
1.25V
C MAIN
47 μ F
PGND
TO
5.5V
OFF
ON
ON
SHDNM
SHDNC
CS+
CS-
OFF
BIN
C1
10 μ F
D2
EP05Q
03L
LXB
LXB2(QFN ONLY)
FBM
R10
BACKUP
BATTERY
L3
22 μ H
BKOFF
R5
R11
0.9V
TO
5.5V
C2
10 μ F
C3
1 μ F
C4
CVL
REF
ACO
LBO
1M ?
R6
1M ?
0.22 μ F
GND
PGNDC
BKUP
INC
R7
1M ?
L2
C7
1 μ F
LXC
5.4 μ H
R8
CORE
1.0V
TO
C CORE 5.5V
22 μ F
FBC
R9
Figure 1. Typical Application Circuit For Low-Input Voltage Applications
each cycle (see Typical Operating Characteristics ). The
switch waveform may exhibit ringing, which occurs at
the resonant frequency of the inductor and stray capaci-
tance, due to the residual energy trapped in the core
when the rectifier MOSFET turns off. This ringing is nor-
mal and does not degrade circuit performance.
When delivering medium-to-high output currents, the
MAX1774 operates in PWM continuous-conduction
mode. In this mode, current always flows through the
inductor and never ramps to zero. The control circuit
adjusts the switch duty cycle to maintain regulation
without exceeding the peak switching current set by
the current-sense resistor.
100% Duty Cycle and Dropout
The MAX1774 operates with a duty cycle up to 100%,
extending the input voltage range by turning the MOS-
FET on continuously when the supply voltage ap-
proaches the output voltage. This services the load
when conventional switching regulators with less than
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1774EGJ | 制造商:Maxim Integrated Products 功能描述: |
| MAX1774EMJ | 功能描述:直流/直流开关转换器 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 |
| MAX1774EVKIT | 功能描述:直流/直流开关转换器 Evaluation Kit for the MAX1774 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 |
| MAX1775EEE | 功能描述:直流/直流开关转换器 Dual-Out Step-Down for PDA/Palmtop 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 |
| MAX1775EEE+ | 功能描述:直流/直流开关转换器 Dual-Out Step-Down for PDA/Palmtop 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 |
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