SC603

更新时间： 2024-01-19 09:45:57

品牌	Logo	应用领域
商升特 - SEMTECH		稳压器输出元件泵
页数	文件大小	规格书
12页	793K
描述
CHARGE PUMP REGULATOR WITH SELECTABLE 5.0V/4.5V OUTPUT

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SC603 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Not Recommended	零件包装代码：	SON
包装说明：	HVSON, SOLCC10,.11,20	针数：	10
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.21
Is Samacsys：	N	模拟集成电路 - 其他类型：	SWITCHED CAPACITOR REGULATOR
最大输入电压：	6.5 V	最小输入电压：	2.5 V
标称输入电压：	3.3 V	JESD-30 代码：	S-XDSO-N10
JESD-609代码：	e3	长度：	3 mm
湿度敏感等级：	1	功能数量：	1
端子数量：	10	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	UNSPECIFIED
封装代码：	HVSON	封装等效代码：	SOLCC10,.11,20
封装形状：	SQUARE	封装形式：	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE
峰值回流温度（摄氏度）：	260	电源：	3/5 V
认证状态：	Not Qualified	座面最大高度：	1 mm
子类别：	Power Management Circuits	最大供电电流 (Isup)：	2.8 mA
表面贴装：	YES	切换器配置：	DOUBLER INVERTER
最大切换频率：	780 kHz	温度等级：	INDUSTRIAL
端子面层：	Matte Tin (Sn)	端子形式：	NO LEAD
端子节距：	0.5 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED	宽度：	3 mm
Base Number Matches：	1

SC603 数据手册

SC603

POWER MANAGEMENT

Applications Information

Frequency Selection

The FSEL input is for frequency selection. A logic High

level at this input will set the clock frequency to 650kHz,

while a logic Low sets the clock to 262kHz. Input from a

µP or other device may be used to change the charge

pump frequency at any time. The optimal frequency will

depend upon the capacitor values, the load current, and

the exceptable amount of output ripple.

Charge Pump Function for Low Ripple

The SC603 uses a voltage doubler circuit which is imple-

mented with two switched or ‘bucket’ capactors. Most

charge pump doublers use only one bucket capacitor.

Two bucket capacitors switching on alternate phases

greatly reduce the output ripple voltage.

Over-Voltage Protection for Low Voltage Capacitors

The output is prevented from exceeding 6.0V. This fea-

ture allows the use of 6.3V ceramic capacitors.

Ripple Performance

Examples of the output ripple, charge pump frequency

and capacitor size are listed in Table 2 Ripple Perfor-

mance.

Comparison with Other Regulation Methods

In many instances, a charge pump regulator is the best

choice for portable power applications. These regula-

tors offer many advantages over switch mode regula-

tors. A smaller bill of materials, less layout area, lower

component height, less noise, no EMF, and less overall

circuit cost are typical reasons to use this type of regula-

tion. The efficiency of a charge pump regulator often

approaches and in some cases exceeds the efficiency

of a switch mode regulator.

Efficiency

Efficiency for the SC603 is defined as,

V ⋅I

⋅ 2⋅I + I

( )

O Q

where V_O= output voltage

I_O= output current

V_IN= input voltage

I_Q= quiescent current [from Electrical Charac-

teristics on page 2]

Inductors are often the largest and most expensive dis-

crete component in a design. There are no inductors

used in the SC603, so the inductor’s cost and layout

area are eliminated. The noise and EMF associated with

the inductor are also eliminated.

The SC603’s fixed frequency harmonics are an advan-

tage in portable communications equipment, such as

cellular telephones. The SC603 has distinct frequen-

cies of operation, so the harmonics are predictable. The

harmonics are not fixed in a switch mode regulator.

Switch mode regulators have harmonics which vary due

to the pulse width modulation used to regulate the out-

put. Varying harmonics can be a problem because it may

be more difficult to ensure acceptable noise perfor-

mance over the entire operating range.

Many switch mode regulators have increased voltage

ripple on the output during pulse skipping mode due to

the fact that there are large periods of time when no

current is supplied to the output. The SC603 supplies

current to the output continuously, so the voltage ripple

is less than a switch mode regulator, even with greatly

reduced output capacitance.

 2004 Semtech Corp.

www.semtech.com

1 2 3 456 7 8...12

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