SEMTECH SC613 Technical data

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SC613

Low Noise Regulated Charge

Pump with Selectable Output

February 8, 2005

Description Features

Applications

Typical Application Circuit

The SC613 is a versatile charge pump designed for use in battery
operated power supply applications. The wide input range is
matched for Li-Ion battery applications. Only two 1uF ceramic
bucket capacitors are required, and the inductorless implementa­tion provides a reduced-EMI solution. Low noise mode switching
circuitry and constant output current allow the use of 1uF input
and output capacitors.

The SC613 charge pump regulator can be used for applications
that require up to 140mA of output current with a 4.5V output.
The 5.0V output version provides up to 100mA of output current.
The small package size, low component count and lower overall
system cost coupled with its low noise make the SC613 a supe­rior solution compared to switch mode regulator designs.

 Small size - MLP Micro 10 lead 3x3mm package
 Selectable 5.0V or 4.5V output voltage
 140mA available with 4.5V output
 100mA available with 5.0V output
 Short circuit protection
 Soft Start function
 Shutdown current <2µA
 Selectable fixed frequencies of 262kHz and 650kHz
 Low ripple
 Regulated to +/-5%
 Ease of use

 Cellular phones
 LED photo flash for cellular phones
 LED backlighting
 PDA power supplies
 Portable electronics
 Electronic books
 Wireless web appliances

Cin

1.0uF

2.7V to 6.5V

Cbucket1

1.0uF

Cbucket2

1.0uF

VIN

EN

VSEL

FSEL

GND

CF2-

CF2+

CF1-

CF1+

VOUT

3

6

4

5

8

7

10

9

2

1

U1

S

C

6

1

3

Cout

1.0uF

UP TO 10 LEDS

4.5V or 5.0V

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Absolute Maximum Ratings

Electrical Characteristics

retemaraPlobmySmumixaMstinU

egatloVylppuSV

NI

0.7+ot3.0-V

egatloVtuptuOV

TUO

0.7+ot3.0-V

V

TUO

noitaruDtiucriCtrohSCSetinifednI

tneibmAoTnoitcnuJ,ecnatsiseRlamrehT

)dohteMdradnatS15DSEJ(

θ

AJ

13W/C°

tneibmAgnitarepOT

A

58+ot04-C°

egnaRerutarepmeTnoitcnuJT

CJ

051+ot04-C°

egnaRerutarepmeTegarotST

GTS

051+ot56-C°

erutarepmeTwolfeRRIT

DAEL

062C°

retemaraPlobmySsnoitidnoCniMpyTxaMstinU

egatloVylppuStupnIV

NI

5.25.6V

tnerruCtnecseiuQI

Q

I,zHk262=.qerF

TUO

V,Am0=

NI

=

V7.3

0.14.1Am

I,zHk056=.qerF

TUO

V,Am0=

NI

=

V7.3

1.28.2Am

0=elbanE2Aµ

egatloVtuptuOV

TUO

htiwnoitalugeRdaoLcitatS

1=LESV

I<Am0

TUO

Am001<

57.40.552.5V

htiwnoitalugeRdaoLcitatS

0=LESV

I<Am0

TUO

Am041<

572.45.4527.4V

tnerruCtuptuOmumixaMI

TUO

1=LESV001Am

0=LESV041Am

ycneuqerFpmuPf

PMUP

0=LESF,1=elbanE%51-262%51+zHk

1=LESF,1=elbanE%02-056%02+zHk

emiTnoitisnarTedoMycneuqerFT

KCOL

ycneuqerfenomorfemitnoitisnarT
edomycneuqerfrehtoynaotedom

ngisedybdeetnaraug

1doireP

tnerruCtiucriCtrohSI

CS

V

TUO

I,V0=

TUOI=NI

006Am

dlohserhThgiHtupnIV

HI

)LESF,LESV,elbanE(sniptupnillA3.1V

dlohserhTwoLtupnILIV)LESF,LESV,elbanE(sniptupnillA4.0V

Unless specified: TA = -40°C to 85°C, Cin=Cbucket = 1.0µF (ESR = 0.1Ω), Cout=1.0uF (ESR = 0.1Ω), Vin= 3.2V to 5.5V

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Note:

(1) Peak to peak output ripple voltage with COUT=CBUCKET=1uF and X5R dielectric.
(2) Guaranteed by design.

(3) This device is ESD sensitive. Use of standard ESD handling precautions is required.

retemaraPlobmySsnoitidnoCniMpyTxaMstinU

tnerruChgiHtupnII

HI

)LESF,LESV,elbanE(sniptupnillA01Aµ

tnerruCwoLtupnII

LI

)LESF,LESV,elbanE(sniptupnillA01Aµ

otyrettaBmorfycneiciffErewoP

tuptuOpmuPegrahCdetalugeR

h

V

NI

V,V0.3=

TUO

I,V0.5=

TUO

Am05=

zHk262=.qerF

5.28%

V

NI

V,V0.3=

TUO

I,V0.5=

TUO

Am05=

zHk056=.qerF

5.18%

egatloVelppiRtuptuOV

PP

I,zHk262=qerf

TUO

Am06=

)2(,)1(

5254Vm

Unless specified: T

A

= -40°C to 85°C, Cin=Cbucket = 1.0µF (ESR = 0.1Ω), Cout=1.0uF (ESR = 0.1Ω), Vin= 3.2V to 5.5V

Electrical Characteristics

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Pin Descriptions

niPemaNniPnoitcnuFniP

1TUOV.V5.4roV0.5otdetalugeregatlovtuptuO

2+1FC.1roticapactekcubfolanimretevitisoP

3NIV.V5.6otV5.2morfgnignaregatlovtupnI

4LESF

;zHk262=qerf,0=LESF.ycneuqerflanoitarepoehtgnitcelesroftupnicigoL

.zHk056=qerf,1=LESF

5LESV .V5.4=TUOV,0=LESV;V5=TUOV,1=LESV.egatlovtuptuoehtgnitcelesroftupnicigoL

6NE.woltesnehwAu2nahtsselsitnerrucsaiB.elbanehgih-evitcA

7-2FC.2roticapactekcubfolanimretevitageN

8DNG.dnuorG

9-1FC.1roticapactekcubfolanimretevitageN

01+2FC.2roticapactekcubfolanimretevitisoP

TdaPlamrehT

elpitlumgnisuenalpdnuorgottcennoC.yllanretnidetcennocton-sesoprupgniknistaehrofdaP

.saiv

Pin Configuration

eciveDegakcaP

)1(

TRTLMI316CS

)2(

mm3x301-PLM

BVE316CSdraoBnoitaulavE

Ordering Information

Note:

(1) Available in tape and reel only. A reel contains 3000 devices.

(2) Available in lead-free package only. This product is fully WEEE and

RoHS compliant.

T

1

2

3

4

56

7

8

9

10

TOP VIEW

MLP-10 3X3 LEAD

VOUT

CF1+

VIN

FSEL

VSEL EN

CF2-

GND

CF1-

CF2+

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Block Diagram

Applications Information

Charge Pump Doubler Type

The SC613 uses a voltage doubler circuit which is implemented
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
and also reduce the size requirement for the output capacitor.

Over Voltage Protection

The output is prevented from exceeding 6.0V. This feature allows
the use of 6.3V ceramic capacitors.

Comparison with Other Regulation Methods

In many instances, a charge pump regulator is the best choice for
portable power applications. These regulators offer many advan­tages over switch mode regulators. 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
regulation. The efficiency of a charge pump regulator often ap­proaches and in some cases exceeds the efficiency of a switch
mode regulator.

Inductors are often the largest and most expensive discrete com­ponent in a design. There are no inductors used in the SC613, so
the inductor’s cost and layout area are eliminated. The noise and
EMF associated with the inductor are also eliminated.

The SC613’s fixed frequency harmonics are an advantage in por­table communications equipment, such as cellular telephones.
The SC613 has distinct frequencies 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 output.
Varying harmonics can be a problem because it may be more

EN

FSEL

VSEL

GND

VIN

6

5

4

8

3

MODE

SELECT

DRIVERS

SWITCH

BLOCK

TIMER

COMPARATORS

VIN
VOUT
VREF

VIN

CF1+

CF1-

CF2+

CF2-

VOUT

2

9

10

7

1

EN

OSC

650kHz o r 262kHz

5.0V or 4.5V

4

5

difficult to ensure acceptable noise performance 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 SC613 supplies current to the output continuously, so the
voltage ripple is less than a switch mode regulator, even with greatly
reduced output capacitance.

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 uP 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.

Ripple Performance

Examples of the output ripple per charge pump frequency and
output voltage are listed in the Ripple Performance table on page

5.

Efficiency

Efficiency for the SC613 is defined as,

=

where V

O

= output voltage

I

O

= output current

V

IN

= input voltage

I

Q

= quiescent current [from Electrical Characteristics

on page 2].

η

VOIO⋅

V

IN

2IO⋅ IQ+

()

⋅

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Table 2 -Ripple Performance

TA = 25°C, Cin=Cout=Cbucket = 1.0µF (ESR = 0.1Ω)

V

TUO

.qerF
]zHk[

elppiRtupuO

]p-pVm[

dnaAm001ta

V5.5otV2.3=niV

V0.5

26252

05651

V5.4

26252

05651

Calculating Power Dissipation

The power dissipated by the SC613 is calculated as,

P

INPOU

T

−

P

D

P

D

VIN2 IO⋅ IQ+

(

)

⋅ VOIO⋅−

=

=

Short Circuit and Over Temperature Protection

The output is current limited to 600mA to protect against short
circuit conditions. Over temperature protection is also provided.

Design and Layout Considerations

The center pad “thermal slug” is not internally connected to ground,
but should be connected to ground in the layout through vias con­necting to the ground plane. Pin 8 can be routed directly to the
center pad. A good ground plane connection is important to make
effective use of the low thermal resistance of the MLP package.

Short Circuit and Over Temperature Protection

The output is current limited to 600mA to protect against short
circuit conditions. Over temperature protection is also provided.

Design and Layout Considerations

The center pad “thermal slug” is not internally connected to ground,
but should be connected to ground in the layout through vias con­necting to the ground plane. Pin 8 can be routed directly to the
center pad. A good ground plane connection is important to make
effective use of the low thermal resistance of the MLP package.

Applications Information (cont.)

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Typical Characteristics

Efficiency vs. Load

0.0%

10.0%

20.0%

30.0%

40.0%

50.0%

60.0%

70.0%

80.0%

0.0 20.0 40.0 60.0 80.0 100.0 120.0 140.0

Load Current [mA]

Efficiency [%

]

5V Outp ut, 3.8 V Input

5V Outp ut, 3.2 V Input

4.5V Output, 3.8V Input

4.5V Output, 3.2V Input

Load Regulation

4.300

4.400

4.500

4.600

4.700

4.800

4.900

5.000

0.0 20.0 40.0 60 .0 80.0 100.0 120.0 140.0

Load Curr ent [mA]

Output Voltage [V]

5V Outp ut, 3.8 V Input

4.5V Output, 3.8V Input

5V Outp ut, 3.2 V Input

4.5V Output, 3.2V Input

4.05

4.1

4.15

4.2

4.25

4.3

4.35

4.4

4.45

4.5

4.55

2.53 3.544.555.5

Input Voltag e [V]

Output Voltage [V]

650kHz, 140mA

650kHz, 75mA

4.5

4.6

4.7

4.8

4.9

5

5.1

2.5 3 3.5 4 4.5 5 5.5

Input Voltage [V ]

Output Voltage [V]

650kHz, 100mA

650kHz, 40mA

Efficiency vs. Load Current

Load Regulation

Quiescent Current

Line Regulation for 4.5V

Line Regulation for 5.0V

Quiescent Currrent

0.500

0.700

0.900

1.100

1.300

1.500

1.700

1.900

2.100

2.300

2.500

2.700 3.200 3.700 4.200 4.70 0 5.200

Input Voltage [V]

Quiescent Current [ mA]

Vo=4.5, 262kHz

Vo=5.0V, 262kHz

Vo=4.5V, 650kHz

Vo=5.0V, 650kHz

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Start Up for 4.5V, 100mA

Start Up for 5.0V, 100mA

Recommended Minimum Low Pulse Width Recommended Minimum High Pulse Width

Recommended Minimum 100Hz PWM

Recommended Maximum 500Hz PWM

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Output Ripple on 5.0V Output at 262kHz

Output Ripple on 5.0V Output at 650kHz

Output Ripple on 4.5V Output at 262kHz

Output Ripple on 4.5V Output at 650kHz

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Application Schematic

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Marking Information

Top Marking

yyww = Datecode (Example: 0252)

Evaluation Board Bill of Materials

ReferenceReference

ReferenceReference

Reference

ValueValue

ValueValue

Value

CommentComment

CommentComment

Comment
U1 SC613 MLP -Micro 10 lead 3x3mm.
C1, C2, C3, C4 1.0uF Ceramic, low ESR type, voltage of 6.3V rating is acceptable for all capacitors.
C5 10uF This extra capacitor supports usage of long power leads from a benchtop supply.
R1 through R10 - Add limiting resistors to meet the requirements of the application on 0805 pads.
D1 through D10 - Add white or blue LEDs to meet the requirements of the application on 1206 pads.

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Evaluation Board Gerber Plots

Top View Bottom View

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Land Pattern - MLP 3x3-10

MIN

aaa
bbb

b

e
L

N

D

C

E

A1
A2

A

DIM

MILLIMETERS

NOM

DIMENSIONS

MAXNOM

INCHES

MIN MAX

.114 .118 .122 2.90 3.00 3.10

-

-

-

-

(LASER MARK)

INDICATOR

PIN 1

1N2

NOTES:

CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).

COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS TERMINALS.2.

1.

.003

.007

.042

10

.009

.048

-

.000

.031

(.008)

0.08

0.23

10

.011

.052

0.18

1.06

.039

-

.002-0.00

0.80

1.31

0.30

1.21

-

0.05

1.00

(0.20)

.004 0.10

0.50 BSC.020 BSC

0.30.012 .020.016 0.40 0.50

A

aaa

C

A2

SEATING
PLANE

A1

A

bxN

bbb C A B

B

e

C

C

D

LxN

E

E

.074 .079 .083 1.87 2.02 2.12

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Contact Information

Land Pattern- MLP-Micro 10

Outline Drawing - MLP 3x3-10

.087

.055

2.20

1.40

.150

.020
.012
.037

3.80

0.30

0.95

0.50

(.112)

.075 1.90

(2.85)

K

H

X

THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY.
CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR
COMPANY'S MANUFACTURING GUIDELINES ARE MET.

NOTES:

1.

INCHES

DIMENSIONS

G

K

H

X
Y

P

Z

C

DIM MILLIMETERS

Y

Z

G

(C)

P

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Power Management Products Division
200 Flynn Road, Camarillo, CA 93012

Phone: [phone] FAX [phone]

Contact Information