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| 型号： | MAX1540AETJ+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 22/49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
Table 2. Component Suppliers
Detailed Description
SUPPLIER
Central
Semiconductor
Coilcraft
Fairchild
Semiconductor
International
Rectifier
Kemet
Panasonic
Sanyo
Siliconix
(Vishay)
Sumida
Taiyo Yuden
TDK
TOKO
PHONE
631-435-1110
(USA)
800-322-2645
(USA)
888-522-5372
(USA)
310-322-3331
(USA)
408-986-0424
(USA)
65-6231-3226
(Singapore),
408-749-9714
(USA)
619-661-6835
(USA)
203-268-6261
(USA)
408-982-9660
(USA)
03-3667-3408
(Japan),
408-573-4150
(USA)
847-803-6100
(USA),
81-3-5201-7241
(Japan)
858-675-8013
(USA)
WEBSITE
www.centralsemi.com
www.coilcraft.com
www.fairchildsemi.com
www.irf.com
www.kemet.com
www.panasonic.com
www.sanyovideo.com
www.vishay.com
www.sumida.com
www.t-yuden.com
www.component.tdk.com
www.tokoam.com
The MAX1540A/MAX1541 provide three independent out-
puts with independent enable controls. They contain two
Quick-PWM step-down controllers ideal for low-voltage
power supplies for notebook computers, and a 100mA
linear regulator. Maxim’s proprietary Quick-PWM pulse-
width modulators in the MAX1540A/ MAX1541 are specifi-
cally designed for handling fast load steps while
maintaining a relatively constant operating frequency and
inductor operating point over a wide range of input volt-
ages. The Quick-PWM architecture circumvents the poor
load-transient timing problems of fixed-frequency current-
mode PWMs, while also avoiding the problems caused
by widely varying switching frequencies in conventional
constant-on-time and constant-off-time PWM schemes.
The MAX1540A linear regulator draws power from the
battery voltage and generates a preset 5V, which can
be used to bootstrap the buck controllers for automatic
startup. The MAX1541’s linear regulator can be con-
nected to any input source from 4.5V to 28V to gener-
ate an adjustable output voltage as low as 1.25V, or as
high as the input source with 800mV of dropout at
50mA load.
Single-stage buck conversion allows the MAX1540A/
MAX1541 to directly step down high-voltage batteries
for the highest possible efficiency. Alternatively, two-
stage conversion (stepping down from another system
supply rail instead of the battery at a higher switching
frequency) allows the minimum possible physical size.
The MAX1540A generates chipset, dynamic random-
access memory (DRAM), CPU I/O, or other low-voltage
supplies down to 0.7V. The MAX1541 powers chipsets
and graphics processor cores that require dynamically
adjustable output voltages, or generates the active ter-
mination bus that must track the input reference. The
MAX1540A is available in a 32-pin thin QFN package
with optional inductor-saturation protection and over-
voltage/undervoltage protection. The MAX1541 is avail-
able in a 40-pin thin QFN package with optional
Standard Application Circuits
The MAX1540A standard application circuit (Figure 1)
generates a 1.8V and 2.5V rail for general-purpose use
in a notebook computer. The MAX1541 Standard
Application Circuit (Figure 12) generates a dynamically
adjustable output voltage (OUT1), typical of a graphics-
processor core requirement, and a fixed 2.5V output
(OUT2).
See Table 1 for component selections. Table 2 lists the
component manufacturers.
inductor-saturation protection and overvoltage/under-
voltage protection.
+5V Bias Supply (V CC and V DD )
The MAX1540A/MAX1541 require a 5V bias supply in
addition to the battery. This 5V bias supply is either the
MAX1540A/MAX1541s’ internal linear regulator or the
notebook’s 95%-efficient 5V system supply. Keeping the
bias supply external to the IC can improve efficiency
and allows the fixed 5V or adjustable linear regulator
(MAX1541) to be used for other applications. For the
MAX1540A, the gate-driver input supply (V DD ) is con-
22
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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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