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参数资料
| 型号： | MAX1845ETX+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 22/27页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 36-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 540kHz |
| 电源电压： | 4.5 V ~ 5.5 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 36-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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Dual, High-Efficiency, Step-Down
Controller with Accurate Current Limit
OUT1
OUT2
V BATT
2.5V
FIXED
1.5V
TO ERROR
AMP1
TO ERROR FIXED
AMP2
DH_
FIXED
1.8V
MAX1845
DL_
V OUT
CS_
FB1
2V
0.1V
FB2
OUT_
FB_
R1
R2
MAX1845
0.1V
Figure 8. Feedback Mux
mount all of the power components on the top side of
GND
Figure 9. Setting V OUT with a Resistor-Divider
the board, with connecting terminals flush against one
another.
USE AGND PLANE TO:
- BYPASS V CC AND REF
- TERMINATE EXTERNAL FB, ILIM,
USE PGND PLANE TO:
- BYPASS V DD
- CONNECT IC GROUND
Keep the high-current paths short, especially at the
ground terminals. This practice is essential for stable,
OVP DIVIDERS, IF USED
- PIN-STRAP CONTROL
INPUTS
AGND PLANE
TO TOP-SIDE STAR GROUND
jitter-free operation. Short power traces and load con-
nections are essential for high efficiency. Using thick
copper PC boards (2oz vs. 1oz) can enhance full-load
efficiency by 1% or more. Correctly routing PC board
traces is a difficult task that must be approached in
terms of fractions of centimeters, where a single mil-
liohm of excess trace resistance causes a measurable
efficiency penalty.
Place the current-sense resistors close to the top-side
star-ground point (where the IC ground connects to the
PGND PLANE
AGND PLANE
VIA TO TOP-SIDE
GROUND
top-side ground plane) to minimize current-sensing
errors. Avoid additional current-sensing errors by using
a Kelvin connection from CS_ pins to the sense resis-
Q1
V IN
Q3
tors.
The following guidelines are in order of importance:
? Keep the space between the ground connection of
Q2
C IN C IN C IN
Q4
the current-sense resistors short and near the via to
the IC ground pin.
? Minimize the resistance on the low-side path. The
low-side path starts at the ground of the low-side
L1
D1
C1
D2
C2
L2
FET, goes through the low-side FET, through the
inductor, through the output capacitor, and returns
to the ground of the low-side FET. Minimize the resis-
tance by keeping the components close together
and the traces short and wide.
VIA TO OUT1
NOTCH
VIA TO CS1
VIA TO PGND PLANE AND IC GND
TOP-SIDE GROUND PLANE
? Minimize the resistance in the high-side path. This
path starts at V IN , goes through the high-side FET,
Figure 10. PC Board Layout Example
22
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1845ETX-TG068 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1845EVKIT | 功能描述:电源管理IC开发工具 Evaluation Kit for the MAX1845 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 |
| MAX1846EUB | 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 |
| MAX1846EUB+ | 功能描述:电流型 PWM 控制器 Current-Mode Invert PWM 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 |
| MAX1846EUB+T | 功能描述:电流型 PWM 控制器 Current-Mode Invert PWM 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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