Datasheet AN8086S Datasheet (Panasonic)

ICs for CD/CD-ROM Player

■ Overview

The AN8086S is an IC for controlling a DC-DC converter
suitable for the switching power supply of various
portable equipment. It can operate with input voltage

1.1V or more. The AN8086S is based on AN8083S with
the output voltage in the secondary side changed to 3.6V.

■ Features

•

Operatable with low voltage input (PV

CC

>1.1V)

•

Decreased voltage detection circuit built-in

•

Short-circuit protection feature built-in

•

Provided with reset output

•

Synchronizable with outside clock

•

Low consumption current in stand-by mode

AN8086S

Low Voltage Operation IC for DC-DC Converter

0.1±0.1

1.5±0.2

0.3

0.65

0.15

0.4

1
2
3
4
5
6
7
8

16
15
14
13
12
11
10
9

0.4±0.25

1.27

Unit : mm

6.5

±0.3

4.2±0.3

10.1±0.3

16-lead SOP package (SOP016-P-0225A)

15 1316 14 7

1 2 3 4 5

6

V

CC

PV

CC

10 12

9

8

11

Power
Off

63kΩ

–+

GND

0.9V

1.25V

0.7V

3.24V

0.725V

30kΩ

2.0V

4.8V

2.7V→ 2.5V

2.2V

0.25V

0.85V

V

REF

–

+

–

+

–

+

RESET EMP V

SEN

IN FB SPRO DED OUT

START CT V

REF

POWER

CLK

Starter

Triangular
Wave

Switching
Circuit

Starter SW
Early Value Set.

–+

+

–

+

■ Block Diagram

ICs for CD/CD-ROM Player

AN8086S

■ Absolute Maximum Ratings (Ta=25˚C)

V

CC

PV

CC

P

D

T

opr

T

stg

Supply Voltage

Power Dissipation
Operating Ambient Temperature
Storage Temperature

V

mW

˚C
˚C

Parameter Symbol Rating Unit

14.4

14.4
380

–20 ~ +75

–55 ~ +125

■ Recommended Operating Range (Ta=25˚C)

Parameter Symbol Range

Operating Supply Voltage Range

V

CC

PV

CC

3.6V ~ 12V

1.1V ~ 12V

■ Electrical Characteristics (Ta=25˚C)

Parameter Symbol Condition min. typ. max. Unit

Power VCC Stand-by Mode Supply Current

I

PVCC

2 µA

V

CC

=0V, PVCC=3V

Power VCC No Load Supply Current

I

PVCC

3 mA1.2

V

CC

=3.1V, PVCC=3V

Output Voltage

V

O

V3.6

Reset Output Threshold Voltage

V

TH (RESET)

V

Decreased Voltage Detection Threshold Voltage

2.1V

TH (VSEN)

2.3 V2.2

Short-Circuit Protection Operating Voltage

1.35V

O (SPRO)

2.1 V

V

IN

=0V, V

POWER

=2V

Short-Circuit Protection Operating Voltage

1.7V

O (SPRO)

3.2 V

V

IN

=1V, V

POWER

=0V

Triangular oscillation Frequency in Normal Operation

60f

OSC1

80 kHz70

R

REF

=33kΩ, CT=330pF

f

OSC2

80 100 120 kHzTriangular oscillation Frequency at Start

R

REF

=33kΩ, CT=330pF

V

CC

=1.9V, PVCC=3V

Output Voltage

1.2V

OH (OUT)

1.6 V

I

O

=–20mA, VCT=0V

Output Voltage

V

OL (OUT)

0.4 V

I

O

=20mA, VCT=1V

Note) Unless otherwise specified, V

CC

=4.8V, PVCC=3V

V

TH

× 0.85

V

TH

× 9V

TH

× 0.95

15 16 13 14 10 7 12

9

8

11

6

54321

+

2.2V
V

REF

4.8V

3.24V

0.7V

1.25V

2.0V

0.9V

30kΩ

–25µA

0.725V

63kΩ

+
–

+
–

+

–

+

–

+

+ –

2.7V→ 2.5V

33kΩ

0.01µF

IN FB

SPRO

47µF

DED

0.01µF

OUT

GND

0.01µF

100Ω

POWER

CLK

PV

CC

3.6V

33kΩ330pF

V

REF

CT

START

V

SENSE

EMP

V

CC

+–

Power
OFF

0.25V

0.85V

RESET

Starter

Triangular
Wave

Swiching
Circuit

Starter SW
Early Value Set.

■ Application Circuit Example

ICs for CD/CD-ROM Player

AN8086S

■ Pin Description

Pin No.

Symbol

1 IN

•

Input pin for error amplifier

• Threshold voltage ; 0.7V

2 FB • Output pin for error amplifier

•

Short-circuit protection input pin

If output of error amplifier does not become “L” when t = CVth/I

SPRO

output of IC is not

switched. I

SPRO

=25µA

V

th

= 0.9V

3 SPRO

4 DED

5 OUT

•

Switching output pin

Output current ; IO=20mA (max.)

6 GND • GND pin

• Triangular oscillating capacitor pin

7 CT

8 PV

CC

• DC voltage input pin
Operates with 1.1V or more.

•

Clock input

· It is used to synchronize triangular oscillation with clock input and operates at rise edge of

clock.

· The threshold level is TTL level.

· It is open when not used.

9 CLK

•

Start pin

· Starts switching of starter (start at “L”)

· Threshold voltage, PV

CC

– 0.9V

10 START

11 POWER

•

Power ON/OFF pin

Output ON/OFF switching pin (Output is off at “L.”)

T

1

T

2

V

T1 =

CV

I (Discharged)

f =

1

T

1

+ T

2

T2 =

CV

I (Charged)

I (Discharged) =52µA
I (Charged) =30µA
V = 0.58V

In normal operation

• Reference voltage pin

· 1.25V output

· Charged and discharged current of triangular oscillation is determined by external R.

I (Charged) =

V

REF

– 0.7

R

REF

+1kΩ

I (Discharged)=1.40 × I (Charged)

12 V

REF

13 EMP

•

Decreased voltage detection output pin

“H” when detected by open collector output form

14 V

SEN

• Decreased voltage detection input pin

· Threshold voltage ; 2.2V

•

Reset output pin

· “H” when VCC becomes VO × 0.9V or more

· Open collector output form

15 Reset

16 V

CC

• DC voltage input pin
Operates with 3.6V or more.

•

Dead time control input

Maximum duty ratio set to 85%.

Description