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参数资料
| 型号： | MAX1540AETJ+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 35/49页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR DIVIDER PWM 32-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： | 620kHz |
| 占空比： | 100% |
| 电源电压： | 5.5 V ~ 28 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 是 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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Dual Step-Down Controllers with Saturation
Protection, Dynamic Output, and Linear Regulator
V+
*LDOIN
INTERNAL LDOIN
OPTION BETWEEN
THE MAX1540A/MAX1541
LDOOUT
LDOON
VL REG
AND REF
GATE DRIVER
AND ERROR
AMP
INTERNAL V DD
OPTION BETWEEN
THE MAX1540A/MAX1541
*V DD
FIXED 5V
*FBDLO
INTERNAL FBLDO
OPTION BETWEEN
THE MAX1540A/MAX1541
0.2V
*MAX1541 ONLY.
Figure 13. Internal Linear-Regulator Functional Diagram
Design Procedure
Firmly establish the input voltage range and maximum
load current before choosing a switching frequency
and inductor operating point (ripple-current ratio). The
primary design trade-off lies in choosing a good switch-
ing frequency and inductor operating point, and the fol-
lowing four factors dictate the rest of the design:
?
Switching frequency: This choice determines the
basic trade-off between size and efficiency. The
optimal frequency is largely a function of maximum
input voltage due to MOSFET switching losses that
are proportional to frequency and V IN2 . The opti-
mum frequency is also a moving target, due to
rapid improvements in MOSFET technology that are
making higher frequencies more practical.
?
?
Input voltage range: The maximum value (V IN(MAX) )
must accommodate the worst-case, high AC-adapter
voltage. The minimum value (V IN(MIN) ) must account
for the lowest battery voltage after drops due to con-
nectors, fuses, and battery selector switches. If there
is a choice at all, lower input voltages result in better
efficiency.
Maximum load current: There are two values to
consider. The peak load current (I LOAD(MAX) ) deter-
mines the instantaneous component stresses and fil-
tering requirements and thus drives output capacitor
selection, inductor saturation rating, and the design of
the current-limit circuit. The continuous load current
(I LOAD ) determines the thermal stresses and thus dri-
ves the selection of input capacitors, MOSFETs, and
other critical heat-contributing components.
?
Inductor operating point: This choice provides
trade-offs between size vs. efficiency and transient
response vs. output ripple. Low inductor values
provide better transient response and smaller phys-
ical size, but also result in lower efficiency and
higher output ripple due to increased ripple cur-
rents. The minimum practical inductor value is one
that causes the circuit to operate at the edge of crit-
ical conduction (where the inductor current just
touches zero with every cycle at maximum load).
Inductor values lower than this grant no further size-
reduction benefit. The optimum operating point is
usually found between 20% and 50% ripple current.
When pulse skipping ( SKIP low and light loads), the
inductor value also determines the load-current
value at which PFM/PWM switchover occurs.
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1540ETJ | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1540ETJ+ | 功能描述:DC/DC 开关控制器 Dual Step-Down Ctlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1540ETJ+T | 功能描述:DC/DC 开关控制器 Dual Step-Down Ctlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1540ETJ-T | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1540EVKIT | 功能描述:DC/DC 开关控制器 Evaluation Kit for the MAX1540 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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