Central Engineering CE8301 User Manual

SMALL PACKAGE PFM CONTROL STEP-UP DC/DC CONVERTER CE8301 Series

SMALL PACKAGE PFM CONTROL
STEP-UP DC/DC CONVERTER

CE8301 Series

 Introduction

The CE8301 Series is a CMOS PFM-control

step-up switching DC/DC converter that

mainly consists of a reference voltage

source, an oscillator, and a comparator. The

PFM controller allows the duty ratio to be

automatically switched according to the load

(light load: 50%, high output current: 75%),

enabling products with a low ripple over a

wide range, high efficiency, and high output

current. With the CE8301 Series, a step-up

switching DC/DC converter can be

configured by using an external coil,

capacitor, and diode. The built-in MOS FET is

turned off by a protection circuit when the

voltage at the LX pin exceeds the limit to

prevent it from being damaged. This feature,

 Features

• Low voltage operation: Startup at 0.9 V

min. (I

• Duty ratio: 66/78%, builtin auto switching

type PFM controller

• External parts: Coil, capacitor, diode

• Output voltage: Settable to between 1.8

to 6.5 V in 0.1 V steps

• Accuracy of ±2%

• High efficiency：85%（typ.）

• Standard function (product type A)

• Shutdown function (product type C、D)

• Output voltage Adjustable type (product

= 1 mA) guaranteed

OUT

along with the mini package and low current

consumption, makes the CE8301 Series

ideal for applications such as the power

supply unit of portable equipment.

 Applications

• Power supply for portable equipment such

as digital cameras, electronic notebooks, and

PDAs

• Power supply for audio equipment such as

portable CD/MD players

• Constant voltage power supply for cameras,

video equipment, and communications

equipment

type E、F)

• External transistor type available

(product type B、 E、F)

 Ordering Information

• Power supply for microcomputers

SMALL PACKAGE PFM CONTROL STEP-UP DC/DC CONVERTER CE8301 Series

 Block Diagrams

Pin Assignment

Table 1 CE8301A Series（SOT-23-3 PKG）

Pin No.

1 V

Pin Name

Output voltage pin

OUT

Functions

2 VSS GND pin

3 LX External inductor connection pin

Table 2 CE8301B Series（SOT-23-3 PKG）

Pin No.

1 V

Pin Name

Output voltage pin

OUT

Functions

2 VSS GND pin

3 EXT External transistor connection pin

Table 3 CE8301C Series（SOT-23-5 PKG）

Pin No.

Pin Name

Functions

Shutdown pin

1 EN

“H”: Normal operation

“L”: Step-up stopped

2 V

Output voltage pin

OUT

3 NC (N.C.)

4 VSS GND pin

5 LX External transistor connection pin

Table 4 CE8301D Series（SOT-23-5 PKG）

Pin No.

Pin Name

Functions

Shutdown pin

1 EN

“H”: Normal operation

“L”: Step-up stopped

2 V

Output voltage pin

OUT

3 NC (N.C.)

4 VSS GND pin

5 EXT External transistor connection pin

SMALL PACKAGE PFM CONTROL STEP-UP DC/DC CONVERTER CE8301 Series

Table 5 CE8301 ESeries（SOT-23-5 PKG）

Pin No.

Pin Name

Functions

Output voltage fixed output type;

1

VOUT

(FB)

Output voltage monitoring pin

(Output voltage external setting type;

Feedback pin)

2 VDD IC power supply pin

3 NC (N.C.)

4 VSS GND pin

5 LX External transistor connection pin

Table 6 CE8301 FSeries（SOT-23-5 PKG）

Pin No.

Pin Name

Functions

Output voltage fixed output type;

1

VOUT

(FB)

Output voltage monitoring pin

(Output voltage external setting type;

Feedback pin)

2 VDD IC power supply pin

3 NC (N.C.)

4 VSS GND pin

5 EXT External transistor connection pin

Table 7 CE8301A Series （SOT-89-3 PKG）

Pin No.

Pin Name

Functions

1 VSS GND pin

2 V

Output voltage pin

OUT

3 LX External inductor connection pin

Table 8 CE8301B Series （SOT-89-3 PKG）

Pin No.

Pin Name

Functions

1 VSS GND pin

2 V

Output voltage pin

OUT

3 EXT External transistor connection pin

Table 9 CE8301E Series （SOT-89-5 PKG）

Pin No.

1 NC

Pin Name

Functions

(N.C.)

2 VDD IC power supply pin

Output voltage fixed output type;

3

VOUT

(FB)

Output voltage monitoring pin

(Output voltage external setting type;

Feedback pin)

4 LX External transistor connection pin

5 VSS GND pin

Table 10 CE8301F Series（SOT-89-5 PKG）

SMALL PACKAGE PFM CONTROL STEP-UP DC/DC CONVERTER CE8301 Series

Pin No.

1 NC

Pin Name

Functions

(N.C.)

2 VDD IC power supply pin

Output voltage fixed output type;

3

VOUT

(FB)

Output voltage monitoring pin

(Output voltage external setting type;

Feedback pin)

4 EXT External transistor connection pin

5 VSS GND pin

 Absolute Maximum Ratings

(Unless otherwise specified, Ta=25 C)　

Parameter Symbol Ratings Unit

VOUT pin voltage V

EN pin voltage EN

LX pin voltage VLX

OUT

－0.3 ~ VSS＋10

V

SS

－0.3 ~ VSS＋10

V

SS

－0.3 ~ VSS＋10

V

SS

V

V

V

LX pin current ILX 1000 mA

Power

dissipation

Operating temperature Topr

Storage temperature Tstg

SOT-23-3 250 mW

SOT-23-5 250 mW

SOT-89-3

PD

500 mW

－40 ~＋85

－40 ~＋125

°C

°C

 Electrical Characteristics

(Unless otherwise specified, Ta =25 C)　

Parameter Symbol Conditions Min. Typ. Max. Unit

V

Output voltage V

OUT

Input voltage VIN

Operation start voltage V

Oscillation start voltage V

Current consumption 1 I

Current consumption 2 I

ST1

ST2

SS1

SS2

I

= 1 mA

OUT

No external parts, voltage

applied to V

to V

via 300 resistor

OUT

=0.95

V

OUT

×V

OUT

V

OUT=VOUT

－

－ － －

LX pulled up

OUT

V

：3.0V －

OUT

V

：5.0V

OUT

＋0.5 V －

OUT(S)

×0.98

V

OUT

－ －

－ －

30 40 µA

50 60 µA

6 10 µA

Current consumption

during

VEN = 0 V

I

SSS

－ －

shutdown

Switching current ISW VLX= 0.4 V 100 200

Switching transistor

leakage current

Line regulation V

I

SWQ

OUT1

No external parts,

V

LX＝VOUT

V

= 0.4×V

IN

0.6×V

=10 V ,VEN = 0 V

～

OUT

OUT

－ －

－

20 50 mV

V

×1.02

OUT(S)

V

10 V

0.9 V

0.8 V

0.5 µA

－

mA

0.5 µA

SMALL PACKAGE PFM CONTROL STEP-UP DC/DC CONVERTER CE8301 Series

Load regulation V

Maximum Oscillation

frequency

f

OSC

OUT2

Duty ratio 1 Duty1

I

= 10 µA ~ 50mA

OUT

V

= 0.95×V

OUT

waveform at LX pin

= 0.95×V

V

OUT

， measure

OUT

，

OUT

measure waveform at

－

20 50 mV

100 kHz

70 78 85 %

LX pin

Duty ratio 2 Duty2

Measure waveform at

LX pin with light load

－

66

－

%

Efficiency EFFI 85 %

V

Shutdown pin input

voltage

VSH

V

SL1

=0.95×V

OUT

oscillation at LX pin

V

= 0.95×V

OUT

judge stop at LX pin

， judge

OUT

，

OUT

0.75

－ －

－ －

0.3 V

V

Shutdown pin input

current

Remark： V

IN =VOUT(S)

Shutdown function built-in type: EN pin is connected to V

V

OUT(S)

output voltage.

 ×0.6 applied, I

specified above is the set output voltage value, and V

■ Standard Circuits

1、CE8301A Circuits：

2、CE8301C Circuits：

ISH

I

SL

OUT

＝10V －0.1 －

V

EN

＝0V －0.1 －

V

EN

=V

OUT(S)

/ 250 

OUT

is the typical value of the actual

OUT

0.1 µA

0.1 µA

SMALL PACKAGE PFM CONTROL STEP-UP DC/DC CONVERTER CE8301 Series

3、CE8301B Circuits：

4、CE8301D Circuits：

5、CE8301E Circuits：

6、CE8301F Circuits:

SMALL PACKAGE PFM CONTROL STEP-UP DC/DC CONVERTER CE8301 Series

■ Characteristics

1. CE8301A30P：

a、 V

vs. I

OUT

OUT

:

b. Efficiency vs. I

OUT

:

SMALL PACKAGE PFM CONTROL STEP-UP DC/DC CONVERTER CE8301 Series

2. CE8301A33P：

a、V

vs. I

OUT

OUT

:

b、Efficiency vs. I

OUT

:

SMALL PACKAGE PFM CONTROL STEP-UP DC/DC CONVERTER CE8301 Series

3. CE8301A50P：

a. V

vs. I

OUT

OUT

:

b. Efficiency vs. I

OUT

:

SMALL PACKAGE PFM CONTROL STEP-UP DC/DC CONVERTER CE8301 Series

 Package information

● SOT-23

● SOT-89

Symbols

A 1.40 1.50 1.60

b 0.36 0.42 0.48

b1 0.41 0.47 0.53

b2 1.40 1.60 1.75

C 0.38 0.40 0.43

D 4.40 4.50 4.60

E － － 4.25

E1 2.40 2.50 2.60

θ 1.40 1.50 1.60

L 1.80 － －

L1 － 0.40 －

Dimensions in millimeters

Min Nom Max

SMALL PACKAGE PFM CONTROL STEP-UP DC/DC CONVERTER CE8301 Series

● SOT- 23- 5

● SOT- 89- 5