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| 型号： | MAX17003AETJ+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/36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
Table 2. Component Suppliers
The MAX17003A/MAX17004A SMPS require a 5V bias
supply in addition to the high-power input supply (bat-
SUPPLIER
AVX
Central Semiconductor
Fairchild
International Rectifier
KEMET
NEC/Tokin
Panasonic
Philips
Pulse
Renesas
SANYO
Sumida
Taiyo Yuden
TDK
TOKO
Vishay (Dale, Siliconix)
WEBSITE
www.avx.com
www.centralsemi.com
www.fairchildsemi.com
www.irf.com
www.kemet.com
www.nec-tokin.com
www.panasonic.com/industrial
www.philips.com
www.pulseeng.com
www.renesas.com
www.edc.sanyo.com
www.sumida.com
www.t-yuden.com
www.component.tdk.com
www.tokoam.com
www.vishay.com
tery or AC adapter). This 5V bias supply is generated by
the controller’s internal 5V linear regulator (LDO5). This
bootstrapped LDO allows the controller to power up
independently. The gate-driver input supply is connect-
ed to the fixed 5V linear-regulator output (LDO5).
Therefore, the 5V LDO supply must provide LDO5 (PWM
controller) and the gate-drive power, so the maximum
supply current required is:
I BIAS = I CC + f SW (Q G(LOW) + Q G(HIGH) )
= 5mA to 50mA (typ)
where I CC is 0.7mA (typ), f SW is the switching frequency,
and Q G(LOW) and Q G(HIGH) are the MOSFET data
sheet’s total gate-charge specification limits at V GS = 5V.
SMPS-to-LDO Bootstrap Switchover
When the 5V main output voltage is above the LDO5
bootstrap-switchover threshold and has completed
soft-start, an internal 1 Ω (typ) p-channel MOSFET
shorts CSL5 to LDO5, while simultaneously shutting
down the LDO5 linear regulator. This bootstraps the
device, powering the internal circuitry and external
Detailed Description
The MAX17003A/MAX17004A standard application cir-
cuit (Figure 1) generates the 5V/5A and 3.3V/5A typical of
the main supplies in a notebook computer. The input sup-
ply range is 7V to 24V. See Table 1 for component selec-
tions, while Table 2 lists the component manufacturers.
The MAX17003A/MAX17004A contain two interleaved,
fixed-frequency, step-down controllers designed for low-
voltage power supplies. The optimal interleaved archi-
tecture guarantees out-of-phase operation, reducing the
input capacitor ripple. One internal LDO generates the
keep-alive 5V power. The MAX17003A/MAX17004A have
an auxiliary LDO with an adjustable output for generating
either the 3.3V keep-alive supply or regulating the low-
power 12V system supply.
Fixed 5V Linear Regulator (LDO5)
An internal linear regulator produces a preset 5V low-
current output. LDO5 powers the gate drivers for the
external MOSFETs, and provides the bias supply
required for the SMPS analog controller, reference, and
logic blocks. LDO5 supplies at least 100mA for exter-
nal and internal loads, including the MOSFET gate
drive, which typically varies from 5mA to 50mA,
depending on the switching frequency and external
MOSFETs selected. Bypass LDO5 with a 4.7μF or
greater ceramic capacitor (1μF per 25mA of load) to
guarantee stability under the full-load conditions.
loads from the 5V SMPS output (CSL5), rather than
through the linear regulator from the battery. Boot-
strapping reduces power dissipation due to gate
charge and quiescent losses by providing power from
a 90%-efficient switch-mode source, rather than from a
much-less-efficient linear regulator. The current capa-
bility increases from 100mA to 200mA when the LDO5
output is switched over to CSL5. When ON5 is pulled
low, the controller immediately disables the bootstrap
switch and reenables the 5V LDO.
Reference (REF)
The 2V reference is accurate to ±1% over temperature
and load, making REF useful as a precision system re-
ference. Bypass REF to GND with a 0.1μF or greater
ceramic capacitor. The reference sources up to 50μA
and sinks 5μA to support external loads. If highly accu-
rate specifications are required for the main SMPS out-
put voltages, the reference should not be loaded.
Loading the reference reduces the LDO5, CSL5
(OUT5), CSL3 (OUT3), and OUTA output voltages
slightly because of the reference load-regulation error.
System Enable/Shutdown ( SHDN )
Drive SHDN below the precise SHDN input falling-edge
trip level to place the MAX17003A/MAX17004A in its
low-power shutdown state. The controller consumes
only 8μA of quiescent current while in shutdown mode.
When shutdown mode activates, the reference turns off
after the controller completes the shutdown sequence,
16
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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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