ICs for CD/CD-ROM Player
s
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.
s
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
13
16
14
7
1
2
3
4
5
6
V
CC
PV
CC
10
12
9
8
11
Power
Off
63k
+
GND
0.9V
1.25V
0.7V
3.24V
0.725V
30k
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.
+
+
+
s
Block Diagram
ICs for CD/CD-ROM Player
AN8086S
s
Absolute Maximum Ratings
(Ta=25C)
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
s
Recommended Operating Range
(Ta=25C)
Parameter
Symbol
Range
Operating Supply Voltage Range
V
CC
PV
CC
3.6V ~ 12V
1.1V ~ 12V
s
Electrical Characteristics
(Ta=25C)
Parameter
Symbol
Condition
min.
typ.
max.
Unit
Power V
CC
Stand-by Mode Supply Current
I
PVCC
2
A
V
CC
=0V, PV
CC
=3V
Power V
CC
No Load Supply Current
I
PVCC
3
mA
1.2
V
CC
=3.1V, PV
CC
=3V
Output Voltage
V
O
V
3.6
Reset Output Threshold Voltage
V
TH (RESET)
V
Decreased Voltage Detection Threshold Voltage
2.1
V
TH (VSEN)
2.3
V
2.2
Short-Circuit Protection Operating Voltage
1.35
V
O (SPRO)
2.1
V
V
IN
=0V, V
POWER
=2V
Short-Circuit Protection Operating Voltage
1.7
V
O (SPRO)
3.2
V
V
IN
=1V, V
POWER
=0V
Triangular oscillation Frequency in Normal Operation
60
f
OSC1
80
kHz
70
R
REF
=33k
, CT=330pF
f
OSC2
80
100
120
kHz
Triangular oscillation Frequency at Start
R
REF
=33k
, CT=330pF
V
CC
=1.9V, PV
CC
=3V
Output Voltage
1.2
V
OH (OUT)
1.6
V
I
O
=20mA, V
CT
=0V
Output Voltage
V
OL (OUT)
0.4
V
I
O
=20mA, V
CT
=1V
Note) Unless otherwise specified, V
CC
=4.8V, PV
CC
=3V
V
TH
0.85
V
TH
9
V
TH
0.95
15
16
13
14
10
7
12
9
8
11
6
5
4
3
2
1
+
2.2V
V
REF
4.8V
3
.
2
4
V
0
.
7
V
1
.
2
5
V
2.0V
0
.
9
V
30k
25
A
0.725V
63k
+
+
+
+
+
+
2.7V
2.5V
33k
0.01
F
IN
FB
SPRO
47
F
DED
0.01
F
OUT
GND
0.01
F
100
POWER
CLK
PV
CC
3.6V
33k
330pF
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.
s
Application Circuit Example
ICs for CD/CD-ROM Player
AN8086S
s
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
= CV
th
/I
SPRO
output of IC is not
switched.
I
SPRO
=25
A
V
th
= 0.9V
3
SPRO
4
DED
5
OUT
Switching output pin
Output current ; I
O
=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
T
1
=
CV
I (Discharged)
f
=
1
T
1
+ T
2
T
2
=
CV
I (Charged)
I (Discharged)
=52
A
I (Charged)
=30
A
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
+1k
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 V
CC
becomes V
O
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
PDF 
ZIP