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| 型号： | MAX1716EEG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/33页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 24-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 550kHz |
| 占空比： | 100% |
| 电源电压： | 2 V ~ 28 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： | 24-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
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High-Speed, Adjustable, Synchronous Step-Down
Controllers with Integrated Voltage Positioning
Table 2. Component Suppliers
MANUFACTURER
MOSFETs
Fairchild Semiconductor
International Rectifier
Siliconix
CAPACITORS
Kemet
Panasonic
Sanyo
Taiyo Yuden
TDK
INDUCTORS
Coilcraft
Coiltronics
Sumida
Sumitomo
PHONE (COUNTRY CODE)
(1) 888-522-5372
(1) 310-322-3331
(1) 203-268-6261
(1) 408-986-0424
(1) 847-468-5624
(65) 281-3226 (Singapore)
(1) 408-749-9714
(03) 3667-3408 (Japan)
(1) 408-573-4150
(1) 847-390-4373
(1) 800-322-2645
(1) 561-752-5000
(1) 408-982-9660
(1) 408-451-8441 (USA)
81 75 961-3141 (Japan)
WEBSITE
www.fairchildsemi.com
www.irf.com
www.vishay.com
www.kemet.com
www.panasonic.com
www.secc.co.jp
www.t-yuden.com
www.tdk.com
www.coilcraft.com
www.coiltronics.com
www.sumida.com
www.ssmc.co.jp
_______________Detailed Description
The MAX1716/MAX1854/MAX1855 buck controllers are
targeted for low-voltage, high-current CPU core power
supplies for notebook computers that typically require
18A (or greater) load steps. The proprietary Quick-
PWM pulse-width modulator in the converter is 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
voltages. 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 con-
ventional constant on-time and constant off-time PFM
schemes.
+5V Bias Supply (V CC and V DD )
The MAX1716/MAX1854/MAX1855 require an external
+5V bias supply in addition to the battery. Typically this
+5V bias supply is the notebook ’ s 95% efficient +5V
system supply. Keeping the bias supply external to the
IC improves efficiency and eliminates the cost associat-
ed with the +5V linear regulator that would otherwise be
needed to supply the PWM circuit and gate drivers. If
stand-alone capability is needed, the +5V supply can
be generated with an external linear regulator.
The +5V bias supply powers V CC (PWM controller) and
V DD (gate-drive power). The maximum current is:
I BIAS = I CC + ? × (Q G1 + Q G2 ) = 10mA to 40mA (typ)
where I CC is 700μA (typ), ? is the switching frequency,
and Q G1 and Q G2 are the MOSFET data sheet total
gate-charge specification limits at V GS = 5V.
The battery input (V+) and +5V bias inputs (V CC and
V DD ) can be connected together if the input source is a
fixed 4.5V to 5.5V supply. If the +5V bias supply is
powered up prior to the battery supply, the enable sig-
nal ( SHDN ) must be delayed until the battery voltage is
present to ensure startup.
Free-Running, Constant-On-Time PWM
Controller with Input Feed-Forward
The Quick-PWM control architecture is a constant-on-
time, current-mode type with voltage feed-forward
(Figure 2). This architecture relies on the output ripple
voltage to provide the PWM ramp signal. Thus, the out-
put filter capacitor ’ s ESR acts as a feedback resistor.
The control algorithm is simple: the high-side switch on-
time is determined solely by a one-shot whose period is
inversely proportional to input voltage and directly pro-
portional to output voltage (see On-Time One-Shot ).
Another one-shot sets a minimum off-time (400ns typ).
The on-time one-shot is triggered if the error compara-
14
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相关PDF资料 |
PDF描述 |
|---|---|
| MAX1717EEG+ | IC REG CTRLR BUCK PWM CM 24-QSOP |
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| MAX1724EZK50-T | IC REG BST SYNC 5V .15A TSOT23-5 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1716EEG+ | 功能描述:DC/DC 开关控制器 Adj Synchronous Step-Down 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 |
| MAX1716EEG+T | 功能描述:DC/DC 开关控制器 Adj Synchronous Step-Down 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 |
| MAX1716EEG-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 |
| MAX17175ETG+ | 制造商:Maxim Integrated Products 功能描述:BOOST REG W/INTEGRATED CHARGE PUMPS SWITCH CONTROL & HIGH-CU - Rail/Tube |
| MAX1717BEEG | 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 |
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