- 您现在的位置：买卖IC网 > PDF目录15041 > MAX1636EAP (Maxim Integrated Products)IC REG CTRLR BUCK PWM CM 20-SSOP PDF资料下载
参数资料
| 型号： | MAX1636EAP |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/23页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 20-SSOP |
| 标准包装： | 66 |
| PWM 型： | 电流模式，混合 |
| 输出数： | 1 |
| 频率 - 最大： | 330kHz |
| 占空比： | 99% |
| 电源电压： | 3.15 V ~ 30 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： | 20-SSOP（0.209"，5.30mm 宽） |
| 包装： | 管件 |
Low-Voltage, Precision Step-Down
Controller for Portable CPU Power
50
CC = 470pF
V OUT = 3.3V
INTEGRATOR
ACTIVE
50
CC = REF
V OUT = 3.3V
INTEGRATOR
DEFEATED
V OUT
(mV)
-50
4
V OUT
(mV)
-50
4
I OUT
(A)
2
I OUT
(A)
2
0
(100 μ s/div)
Figure 5a. Load-Transient Response with Integrator Active
Adjustable-Output Feedback
(Dual-Mode FB)
A fixed, preset output voltage of 2.5V and 3.3V is
selected when FB is connected to V CC or ground. In
this mode, internal resistors monitor the voltage on
CSL. For voltages other than the fixed-output options,
adjust the output voltage through a resistor divider con-
nected to FB (Figure 2). Calculate the output voltage
with the following formula:
V OUT = V REF (1 + R1 / R2)
where V REF = 1.1V nominal. Recommended normal val-
ues for R2 range from 5k Ω to 100k Ω . To achieve a 1.1V
nominal output, simply connect FB directly to CSL.
Remote output voltage sensing is not possible in fixed
output mode due to the combined nature of the volt-
age-sense and current-sense inputs (CSL). It is, howev-
er, easy to do in adjustable mode by using the top of
the external resistor divider as the remote sense point.
Low-Noise Operation (PWM Mode)
PWM mode ( SKIP = high) minimizes RF and audio
interference in noise-sensitive applications such as hi-fi
multimedia-equipped systems, cellular phones, RF
communicating computers, and electromagnetic pen-
entry systems. See the summary of operating modes in
Table 5. SKIP can be driven from an external logic signal.
0
(100 μ s/div)
Figure 5b. Load-Transient Response with Integrator Defeated
PWM mode forces a constant switching frequency,
reducing interference due to switching noise by con-
centrating the emissions at a known frequency outside
the system audio or IF bands. Choose an oscillator fre-
quency for which switching frequency harmonics do
not overlap a sensitive frequency band. If necessary,
synchronize the oscillator to a tight-tolerance external
clock generator. To extend the output voltage-regula-
tion range, constant operating frequency is not main-
tained under overload or dropout conditions (see the
Overload and Dropout Operation section).
PWM mode ( SKIP = high) forces two changes on the
PWM controller. First, it disables the minimum-current
comparator, ensuring fixed-frequency operation.
Second, it changes the detection threshold for reverse-
current limit from 0mV to -100mV, allowing the inductor
current to reverse at light loads. This results in fixed-fre-
quency operation and continuous inductor-current flow.
PWM mode eliminates discontinuous-mode inductor
ringing and improves cross-regulation of transformer-
coupled, multiple-output supplies.
In most applications, tie SKIP to GND to minimize qui-
escent supply current. VL supply current with SKIP high
is typically 20mA, depending on external MOSFET gate
capacitance and switching losses.
______________________________________________________________________________________
17
相关PDF资料 |
PDF描述 |
|---|---|
| ASC05DRES-S93 | CONN EDGECARD 10POS .100 EYELET |
| RSC06DRYI-S734 | CONN EDGECARD 12POS DIP .100 SLD |
| GMA24DRMS | CONN EDGECARD 48POS .125 SQ WW |
| RMC06DRYI-S734 | CONN EDGECARD 12POS DIP .100 SLD |
| GSA22DRMI | CONN EDGECARD 44POS .125 SQ WW |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1636EAP+ | 功能描述:DC/DC 开关控制器 Precision Step-Down for Portable CPU Pwr 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 |
| MAX1636EAP+T | 功能描述:DC/DC 开关控制器 Precision Step-Down for Portable CPU Pwr 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 |
| MAX1636EAP-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 |
| MAX1637EEE | 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 |
| MAX1637EEE+ | 功能描述:DC/DC 开关控制器 Mini Precision 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 |
发布紧急采购，3分钟左右您将得到回复。