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参数资料
| 型号： | MAX1774EEI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/21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
2.7V TO 28V
V IN_AC
D1
NSD03A10
C5
2.7V
TO
20V
MAIN
BATTERY
R1
NDS356AP
P1
1M ?
R4
IN
MDRV
ACI
INS
CVH
1 μ F
C6
10 μ F
DBI
P2
FDS8928A
R2
LBI
PDRV
NDRV
N1
L1
5 μ H
R CS
MAIN
C MAIN
47 μ F
2.6V
TO
5.5V
R3
MAX1774
PGND
OFF
ON
ON
SHDNM
SHDNC
CS+
CS-
OFF
BIN
C1
D2
R10
10 μ F
BACKUP
EP05
Q03L
L3
22 μ H
LXB
LXB2 (QFN ONLY)
FBM
R11
0.9V
TO
5.5V
BATTERY
C2
10 μ F
BKOFF
CVL
ACO
R5
1M ?
C3
R6
1 μ F
C4
0.22 μ F
REF
GND
LBO
1M ?
R7
1M ?
BKUP
PGNDC
INC
L2
C7
1 μ F
22 μ F
LXC
5.4 μ H
R8
CORE
1.0V
C CORE TO
5.5V
FBC
R9
Figure 4. Typical Application Circuit (Cascaded)
voltage-divider to FBC (Figure 1). Resistor values can
be calculated with the following equation:
R8 = R9 ? [(V OUTC / V FBC ) - 1]
where V FBC = +1.0V. Choose R9 to be 30k ? or less.
Setting the Current Limit
The main regulator current limit is set externally through
a small current-sense resistor, R CS (Figure 1). The
value of R CS can be calculated with the following equa-
tion:
R CS = V CLM / (1.3 ? I OUT )
where V CLM = 80mV is the current-sense threshold,
and I OUT is the current delivered to the output. The
core and backup converter current limits are set inter-
nally and cannot be modified.
Careful layout of the current-sense signal traces is
imperative. Place R CS as close to the MAX1774 as pos-
sible. The two traces should have matching length and
width, be as far as possible from noisy switching sig-
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相关代理商/技术参数 |
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| 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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