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参数资料
| 型号： | MAX17003AETJ+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 21/36页 |
| 文件大小： | 0K |
| 描述： | IC SUPPLY CTLR NOTEBOOKS 32TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 控制器，笔记本电脑电源系统 |
| 输入电压： | 6 V ~ 26 V |
| 输出数： | 4 |
| 输出电压： | 3.3V，5V，2 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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High-Efficiency, Quad-Output, Main Power-
Supply Controllers for Notebook Computers
( V IN ? V OUT ) V OUT
inductor-current operation (also known as the “critical
conduction ” point). The load-current level at which
PFM/PWM crossover occurs, I LOAD(SKIP) , is given by:
I LOAD ( SKIP ) =
2 V IN f OSC L
The switching waveforms may appear noisy and asyn-
chronous when light loading causes pulse-skipping
operation, but this is a normal operating condition that
Connect FB3 and FB5 to LDO5 to enable the fixed
SMPS output voltages (3.3V and 5V, respectively), set
by a preset, internal resistive voltage-divider connected
between the output (CSL_) and analog ground.
Connect a resistive voltage-divider at FB_ between the
output (CSL_) and GND to adjust the respective output
voltage between 2V and 5.5V (Figure 5). Choose R FBLO
(resistance from FB to GND) to be approximately 10k Ω
and solve for R FBHI (resistance from the output to FB)
using the equation:
? V OUT _
R FBHI FBLO ?
? 1 ?
results in high light-load efficiency. Trade-offs in PFM
noise vs. light-load efficiency are made by varying the
inductor value. Generally, low inductor values produce
a broader efficiency vs. load curve, while higher values
= R
? V FB _
?
?
result in higher full-load efficiency (assuming that the
coil resistance remains fixed) and less output-voltage
ripple. Penalties for using higher inductor values
include larger physical size and degraded load-tran-
sient response (especially at low input-voltage levels).
Output Voltage
DC output accuracy specifications in the Electrical
Characteristics table refer to the error comparator’s
threshold. When the inductor continuously conducts,
the MAX17003A/MAX17004A regulate the peak of the
output ripple, so the actual DC output voltage is lower
than the slope-compensated trip level by 50% of the
output ripple voltage. For PWM operation (continuous
conduction), the output voltage is accurately defined
by the following equation:
where V FB_ = 2V nominal.
When adjusting both output voltages, set the 3.3V
SMPS lower than the 5V SMPS. LDO5 connects to the
5V output (CSL5) through an internal switch only when
CSL5 is above the LDO5 bootstrap threshold (4.5V)
and the soft-start sequence for the CSL5 side has com-
pleted. Bootstrapping works most effectively when the
fixed output voltages are used. Once LDO5 is boot-
strapped from CSL5, the internal 5V linear regulator
turns off. This reduces the internal power dissipation
and improves efficiency at higher input voltages.
TO ERROR
AMPLIFIER
ADJUSTABLE
V OUT ( PWM ) = V NOM ? 1 ?
? ? ? ?
A SLOPE V RIPPLE ? ? V RIPPLE ?
?
?
?
?
V IN 2
?
FB
LDO5
OUTPUT
where V NOM is the nominal output voltage, A SLOPE
equals 1.1%, and V RIPPLE is the output ripple voltage
(V RIPPLE = ESR x Δ I INDUCTOR , as described in the
Output Capacitor Selection section).
9R
R
In discontinuous conduction (I OUT < I LOAD(SKIP) ), the
MAX17003A/MAX17004A regulate the valley of the out-
put ripple, so the output voltage has a DC regulation level
higher than the error-comparator threshold. For PFM
operation (discontinuous conduction), the output voltage
is approximately defined by the following equation:
OUT
FIXED OUTPUT
FB = LDO5
V OUT ( PFM ) = V NOM +
1 ? f SW ?
2 ? ? f OSC ? ?
I IDLE ESR
Figure 5. Dual Mode Feedback Decoder
where V NOM is the nominal output voltage, f OSC is the
maximum switching frequency set by the internal oscil-
lator, f SW is the actual switching frequency, and I IDLE is
the idle-mode inductor current when pulse skipping .
Current-Limit Protection (ILIM)
The current-limit circuit uses differential current-sense
inputs (CSH_ and CSL_) to limit the peak inductor cur-
rent. If the magnitude of the current-sense signal
exceeds the current-limit threshold, the PWM controller
______________________________________________________________________________________
21
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17003ETJ+ | 功能描述:电压模式 PWM 控制器 Quad Out Main Power Supply Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX17003ETJ+T | 功能描述:电压模式 PWM 控制器 Quad Out Main Power Supply Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX17004AETJ+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX17004ETJ+ | 功能描述:电压模式 PWM 控制器 Quad Out Main Power Supply Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX17004ETJ+T | 功能描述:电压模式 PWM 控制器 Quad Out Main Power Supply Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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