AP34063
UNIVERSAL DC/DC CONVERTER
Features
•
•
•
•
•
•
•
Operation from 3.0V to 40V Input
Low Standby Current
Current Limiting
Output Switch Current to 1.6A
Output Voltage Adjustable
Frequency Operation to 100 kHz
Precision 2% Reference
General Description
The AP34063 Series is a monolithic control circuit containing the
primary functions required for DC-to-DC converters. These
devices consist of an internal temperature compensated
reference, comparator, controlled duty cycle oscillator with an
active current limit circuit, driver and high current output switch.
This series is specifically designed for incorporating in
Step-Down and Step-Up and Voltage-Inverting applications with
a minimum number of external components.
Pin Configuration
(1) PDIP-8L
(Top View)
Switch
Collector
Switch
Emitter
Timing
Capacitor
Gnd
Switch
Collector
Switch
Emitter
Timing
Capacitor
Gnd
(2) SOP-8L
(Top View)
1
2
3
4
8
7
6
5
Driver
I
pk
Sense
V
CC
Collector
Comparator
Inverting
Input
1
2
3
4
8
7
6
5
Driver
I
pk
Sense
V
CC
Collector
Comparator
Inverting
Input
Ordering Information
AP34063 X X X
Package
S8 : SOP-8L
N8 : PDIP-8L
Lead Free
Blank: Normal
L
: Lead-Free
Packing
- U : Tube
- B : Bulk
-13 : Taping
Device
AP34063S8
AP34063N8
Package
Packaging
Code
S8
N8
SOP-8L
PDIP-8L
Tube/Bulk
13” Tape and Reel
Quantity
Part Number
Quantity
Part Number
Suffix
Suffix
100
-U
2500/Tape & Reel
-13
-U
60
⎯
⎯
AP34063 Rev. 1
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Diodes Incorporated
AP34063
UNIVERSAL DC/DC CONVERTER
Maximum Ratings
Parameter
Power Supply Voltage
Comparator Input Voltage Range
Switch Collector Voltage
Switch Emitter Voltage (V
Pin
1 = 40V)
Switch Collector to Emitter Voltage
Driver Collector Voltage
Driver Collector Current (Note 1)
Switch Current
Power Dissipation SOP: T
A
= 25°C
and Thermal
PDIP: T
A
= 25°C
Characteristics
Thermal Resistance
Operating Junction Temperature
Operating Ambient Temperature Range
Storage Temperature Range
Notes:
Symbol
V
CC
V
IR
V
C (switch)
V
E (switch)
V
CE (switch)
V
C (driver)
I
C (driver)
I
SW
P
D
P
D
θ
JA
T
J
T
A
T
stg
Value
40
-0.3 ~ +40
40
40
40
40
100
1.6
600
1.25
160
+150
0 ~ +70
-65 ~ +150
Unit
V
V
V
V
V
V
mA
A
mW
W
°C/W
°C
°C
°C
1.Maximum package power dissipation limits must be observed.
2. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as
possible.
Electrical Characteristics
( V
CC
= 5.0V, unless otherwise specified.)
Characteristics
OSCILLATOR
Frequency (V
Pin
5 = 0V, C
T
= 1.0nF, T
A
= 25°C)
Charge Current (V
CC
= 5.0V to 40V, T
A
= 25°C)
Discharge Current (V
CC
= 5.0V to 40V, T
A
= 25°C)
Discharge to Charge Current Ratio (Pin 7 to V
CC
, T
A
= 25°C)
Current Limit Sense Voltage (I
chg
= I
dischg
, T
A
= 25°C)
OUTPUT SWITCH
(Note 2)
Saturation Voltage, Darlington Connection
(I
SW
= 1.0A, Pins 1,8 connected)
Saturation Voltage, Darlington Connection
(I
SW
= 1.0A, ID = 50mA, Forced
ß
≈
20)
DC Current Gain (I
SW
= 1.0A, V
CE
= 5.0V, T
A
= 25°C)
Collector Off-State Current (V
CE
= 40V)
COMPARATOR
Threshold Voltage
T
A
= 25°C
T
A
= 0
o
C ~ 70
o
C
Threshold Voltage Line Regulation (V
CC
= 3.0V to 40V)
TOTAL DEVICE
Supply Current (V
CC
= 5.0V to 40V, C
T
=1.0nF, Pin 7 = V
CC
,
V
Pin 5
> V
th
Pin 2 = Gnd, remaining pins open)
Symbol
f
osc
I
chg
I
dischg
I
dischg
/ I
chg
V
ipk (sense)
V
CE (sat)
V
CE (sat)
h
FE
I
C (off)
V
th
-
-
Reg
line
I
CC
Min
24
24
140
5.2
300
-
-
50
-
-
1.225
1.21
-
-
Typ
33
30
200
6.5
400
1.0
0.45
75
0.01
-
1.25
-
1.4
-
Max
42
42
260
7.5
450
1.3
0.7
-
100
-
1.275
1.29
6.0
3.5
Unit
kHz
µA
µA
-
mV
V
V
-
µA
V
-
-
mV
mA
AP34063 Rev. 1
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Diodes Incorporated
AP34063
UNIVERSAL DC/DC CONVERTER
Representative Schematic Diagram
Drive
Collector
8
1
Switch
Collector
S Q
Q2
Q1
100
2
Switch
Emitter
R
I
pk
Sense
7
Ipk
Oscillator
6
V
CC
CT
Comparator
+
_
1.25V
Reference
Regulator
3
Timing
Capacitor
Comparator
Inverting
Input
5
4
Gnd
(Bottom View)
AP34063 Rev. 1
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Diodes Incorporated
AP34063
UNIVERSAL DC/DC CONVERTER
Typical Performance Characteristics
Figure 1. Vce(sat) versus le
Vce(sat), Saturation Voltage (V)
1.4
1.26
Figure 2. Reference Voltage versus Temp.
1.2
Reference Voltage (V)
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.255
1
1.25
0.8
1.245
0.6
1.24
0
10
20
30
40
50
60
o
70
80
90
100
Ie, Emitter Current (A)
Temperature ( C)
Figure 3. Current Limit Sense Voltage
versus Temperature
440
4.0
Figure 4. Standby Supply Current
versus Supply Voltage
Current Sense Voltage (mV)
420
Icc, Supply Current (mA)
10
20
30
40
50
60
70
80
90
100
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0
5
10
15
20
25
30
35
40
400
380
360
340
320
0
Temperature (
o
C)
Vcc, Supply Voltage (V)
Figure 5. Emitter Follower Configuration
Output Saturation Voltage vs. Emitter Current
1.8
1.75
Vcc=2~10V
Pin1,7,8=Vcc
Pin3,5=GND
T
A
=25
o
C
Pin2=5
≤10W
Figure 6.Output Switch On-Off Time versus
Oscillator Timing Capacitor
t
on-off
, Output Switch On-Off Time(us)
1000
V
CE
( sat), (V)
1.7
1.65
1.6
1.55
1.5
1.45
1.4
100
100
V
CC
= 5.0V
Pin 7 = V
CC
Pin 5 = GND
T
A
= 25
o
C
t
on
10
t
off
1
300
500
700
900
1100
1300
1500
I
E
(mA)
0.1
0.01
C
T
, Oscillator Timing Capacitor ( nF)
0.1
1
10
AP34063 Rev. 1
4 of 11
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Diodes Incorporated
AP34063
UNIVERSAL DC/DC CONVERTER
Application Circuit
(1) Step-Up Converter
120uH
L
8
180
S Q
Q2
Q1
2
1N5819
I
pk
R
sc
0.24
V
in
12V
6
+
1
R
7
C
T
Osc
3
V
CC
+
_
470
uF
C
T
Comp.
1.25V
Ref
Reg
680
pF
4
V
out
28V/200mA
470uF
+
5
R2
R1
10k 56k
C
O
1.0uH
V
out
+
100
Optional Filter
Test
Line Regulation
Load Regulation
Output Ripple
Efficiency
Conditions
V
in
= 9V to 12V, I
O
= 200mA
V
in
= 12V, I
O
= 50mA to 200mA
V
in
= 12V, I
O
= 200mA
V
in
= 12V, I
O
= 200mA
Results
20mV =
±0.035%
15mV =
±0.035%
500mV
PP
80%
AP34063 Rev. 1
5 of 11
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AUGUST 2006
©
Diodes Incorporated
Embedded System
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