参数资料
| 型号： | SP6650EU-L |
| 厂商： | Exar Corporation |
| 文件页数： | 13/17页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 3.3V/ADJ 10MSOP |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 3.3V，1.25 V ~ 5 V |
| 输入电压： | 2.7 V ~ 6.5 V |
| 电流 - 输出： | 600mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 10-MSOP |
| 其它名称： | 1016-1215-5 |
S P 6 6 5 0
H i g h E f f i c i e n c y 6 0 0 m A S y n c h r o n o u s B u c k R e g u l a t o r
The additional Rf/Cf network used in Figure 19
generates an artificial ramp from the LX pin
voltage and superimposes it to the feedback
pin. As a result, the internal loop comparator
doesn’t have to rely on output ripple to run
PFM. Now low ESR output capacitors, such as
ceramic capacitors, can be used, and the
output ripple can be reduced by two to three
times. For the best result, size the Cf and Rf
values so the network would introduce 10 to
Fig. 20 V OUT transient response from 50mA to
500mA load step. CH1- V OUT , CH4 - I LOAD
SP6650 can also be configured with few
external components to achieve buck-boost
voltage conversion. Efficiency of 75% to 87%
can often be obtained depending on the load
current and output voltage. Figure 22 and
Figure 23 demonstrate two typical applications
in which the USB input is converted to a 12V
and a well regulated 5V.
The operation of the circuit is as follows. When
the internal high side PMOS turns on, the LX
pin swings to the input voltage which turns on
the external NMOS Q1. A voltage equal to Vin
is then applied to the inductor to cause the
inductor current rise linearly. Since there’s no
current delivered to the output, the output
capacitor is discharged by the load current.
Therefore, the internal PMOS can be only
turned off by the over-current comparator
since the loop comparator would never toggle
during this state. When the internal PMOS is
open, the internal low side NMOS is turned on.
This pulls the LX pin to the ground and turns
30mV ripples to the FB pin. Oversized ripple
would compromise the load regulation and
also cause oscillation during load transient.
Load transient response and output ripples
from Figure 16 circuit are shown in Figure 20
and Figure 21, respectively. The added ripple
voltage can be calculated from
Fig. 21 Output ripple CH1-output ripple. V IN = 5,
V OUT = 3.3V, I LOAD = 600mA
off the Q1. As a result, the Schottky D2 is
forward biased and conducts the inductor
current to the output. Now the inductor
experiences a reversed voltage equal to V OUT
and its current ramps down linearly. As
expressed in the Operation section under
Inductor Over-Current Protection, a minimum
T OFF timer is activated after the over-current
comparator is triggered in the previous state.
Before T OFF expires, the internal PMOS will not
turn on, and the inductor will not be recharged
even when the output voltage drops below the
regulation voltage. This reduces the maximum
load current that can be delivered by this
circuit. Since T OFF is reverse proportional to the
V OUT pin voltage, the V OUT pin is pulled up
using a voltage divider tying to the input
voltage. As a result, a 5V to 12V conversion
can provide maximum 120mA load. This buck-
boost circuit can regulate an output voltage
higher, lower or equal to the input voltage.
? 2012 Exar Corporation
13/17
Rev. 2.0.0
相关PDF资料 |
PDF描述 |
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| SP6651AEU-L | IC REG BUCK SYNC ADJ 0.8A 10MSOP |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6650EU-L/TR | 功能描述:DC/DC 开关控制器 High Eff 600mA Synchronous 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 |
| SP6650UEB | 功能描述:电源管理IC开发工具 Hi Efficiency 600mA Sync Buck Regulator RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| SP6651A | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Efficiency 800mA Synchronous Buck Regulator Ideal for portable designs powered with Li Ion battery |
| SP6651AEB | 功能描述:DC/DC 开关控制器 Hi Efficiency 800mA Sync Buck Regulator 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 |
| SP6651AER | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Efficiency 800mA Synchronous Buck Regulator Ideal for portable designs powered with Li Ion battery |
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