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| 型号： | SP6651AER-L |
| 厂商： | Exar Corporation |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.8A 10DFN |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1 V ~ 5.5 V |
| 输入电压： | 2.7 V ~ 5.5 V |
| 电流 - 输出： | 800mA |
| 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-VFDFN 裸露焊盘 |
| 包装： | 散装 |
| 供应商设备封装： | 10-DFN（3x3） |
| 其它名称： | 1016-1404 |
THEORY OF OPERATION
The SP6651A is a high efficiency synchronous
buck regulator with an input voltage range of
+2.7V to +5.5Vand an output that is adjustable
between +1.0V and V IN . The SP6651A features
a unique on-time control loop that runs in dis-
continuous conduction mode (DCM) or con-
tinuous conduction mode (CCM) using syn-
chronous rectification. Other features include
over-temperature shutdown, over-current pro-
DRVON
I(L1)
RAMP: CCM OPERATION
REF, FB
tection, digitally controlled enable and under-
voltage lockout, a battery low indicator, and an
FB’
V OS
REF’
external feedback pin.
The SP6651A operates with a light load quies-
cent current of 20 μ A using a 0.3 ? PMOS main
switch and a 0.3 ? NMOS synchronous switch.
It operates with excellent efficiency across the
entire load range, making it an ideal solution for
DRVON
RAMP: DCM OPERATION
battery powered applications and low current
step-down conversions. The part smoothly tran-
sitions into a 100% duty cycle under heavy load/
low input voltage conditions.
I(L1)
On-Time Control - Charge Phase
The SP6651A uses a precision comparator and
a minimum on-time to regulate the output volt-
age and control the inductor current under nor-
mal load conditions. As the feedback pin drops
below the regulation point, the loop comparator
FB’
REF’
REF, FB
V OS
output goes high and closes the main switch.
The minimum on-timer is triggered, setting a
logic high for the duration defined by:
ramp voltage (V RAMP in the functional diagram)
is added to FB and this creates the FB's signal.
This FB signal is applied to the negative termi-
T ON =
where:
K ON
V IN - V OUT
nal of the loop comparator. To the positive
terminal of the loop comparator is applied the
REF voltage of 0.8V plus an offset voltage Vos
to compensate for the DC level of V RAMP ap-
K ON = 2.25V* μ sec constant
V IN = V IN pin voltage
V OUT = V OUT pin voltage
To accommodate the use of ceramic and other
low ESR capacitors, an open loop ramp is added
to the feedback signal to mimic the inductor
current ripple. The following waveforms de-
scribe the ideal ramp operation in both CCM and
DCM operation.
In either CCM or DCM, the negative going
plied to the negative terminal. The result is an
internal ramp with enough negative going offset
(approximately 50mV) to trip the loop com-
parator whenever FB falls below regulation.
The output of the loop comparator, a rising
VOLOW, causes a SET if BLANK = 0 and
OVR_I = 0. This starts inductor charging
(DRVON = 1) and starts the minimum on-timer.
The minimum on-timer times out and indicates
DRVON can be reset if the voltage loop is
satisfied. If V OUT is still below the regulation
Date: 5/25/04
SP6651A High Efficiency 800mA Synchronous Buck Regulator
7
? Copyright 2004 Sipex Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6651AER-L/TR | 功能描述:DC/DC 开关控制器 High Eff 800mA 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 |
| SP6651AEU | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP6651AEU/TR | 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 |
| SP6651AEU-L | 功能描述:DC/DC 开关控制器 High Eff 800mA 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 |
| SP6651AEU-L/TR | 功能描述:DC/DC 开关控制器 High Eff 800mA 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 |
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