AP1506
150kHz, 3A PWM BUCK DC/DC CONVERTER
Description
The AP1506 series are monolithic IC designed for a step-down
DC/DC converter, and own the ability of driving a 3A load without
external transistor. Due to reducing the number of external
components, the board space can be saved easily. The external
shutdown function can be controlled by logic level and then come into
standby mode. The internal compensation makes feedback control
have good line and load regulation without external design. Regarding
protected function, thermal shutdown is to prevent over temperature
operating from damage, and current limit is to prevent over current
operating of the output switch. If current limit function occurred and
V
FB
is down to 0.5V below, the switching frequency will be reduced.
The AP1506 series operate at a switching frequency of 150kHz thus
allowing smaller sized filter components than what would be needed
with lower frequency switching regulators. Other features include a
guaranteed ±4% tolerance on output voltage under specified input
voltage and output load conditions, and ±15% on the oscillator
frequency. The output version included fixed 3.3V, 5V, 12V, and an
adjustable type. The packages are available in a standard 5-lead
TO263-5, TO220-5 and TO220-5 (R).
Pin Assignments
(Top View)
5 SD
4 FB
3 GND
2 Output
1 V
IN
Metal Tab GND
TO263-5
(Top View)
5 SD
4 FB
3 GND
2 Output
1 V
IN
TO220-5/TO220-5 (R)
Features
Output Voltage: 3.3V, 5V, 12V and Adjustable Output Version
Adjustable Version Output Voltage Range, 1.23V to 18V+4%
150kHz +15% Fixed Switching Frequency
Voltage Mode Non-Synchronous PWM Control
Thermal-Shutdown and Current-Limit Protection
ON/OFF Shutdown Control Input
Operating Voltage can be up to 22V
Output Load Current: 3A
Low Power Standby Mode
Built-in Switching Transistor On Chip
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free.“Green” Device (Note 3)
Applications
Simple High-Efficiency Step-Down Regulator
On-Card Switching Regulators
Positive to Negative Converter
Notes:
1.
2.
No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free,"Green"
and Lead-free.
Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
3.
AP1506
Document number: DS31015 Rev. 8 - 2
1 of 14
www.diodes.com
December 2017
© Diodes Incorporated
AP1506
Electrical Characteristics
(All Output Voltage Versions)
Unless otherwise specified, V
IN
= 12V for 3.3V, 5V, adjustable version and V
IN
= 18V for the 12V version. I
LOAD
= 0.5A. Specifications with
boldface type
are for full operating temperature range, the other type are for T
J
= +25°
C.
Symbol
I
FB
Parameter
Feedback Bias Current
V
FB
= 1.3V
(Adjustable version only)
—
When current limit occurred and V
FB
< 0.5V, T
A
= 25°
C
I
OUT
= 3A
V
SAT
Saturation Voltage
Max. Duty Cycle (ON)
DC
Min. Duty Cycle (OFF)
I
CL
Current Limit
No outside circuit
V
FB
= 0V force driver on
V
FB
= 0V force driver on
V
FB
= 12V force driver off
Peak current
No outside circuit
V
FB
= 0 force driver on
Output
Current
Leakage
No outside circuit
V
FB
= 12V force driver off
V
IN
= 22V
V
FB
= 12V force driver off
SD pin = 5V
V
IN
= 22V
Low (Regulator ON)
High (Regulator OFF)
V
LOGIC
= 2.5V (OFF)
V
LOGIC
= 0.5V (ON)
TO263-5 (Note 4)
TO220-5 (R) (Note 4)
TO263-5 (Note 4)
TO220-5 (R) (Note 4)
—
—
—
3.6
1.4
100
0
4.5
Conditions
Min
—
127
110
10
Typ
-10
150
—
30
Max
-50
-100
173
kHz
173
50
1.6
1.7
—
—
5.5
6.5
-200
—
10
150
70
—
—
—
-0.1
37
31
6
5
200
0.6
V
IN
(Note 5)
-0.01
-1
—
—
—
—
°
C/W
µA
V
A
V
kHz
nA
Unit
f
OSC
f
SCP
Oscillator Frequency
Oscillator Frequency of Short Circuit
Protection
%
I
L
I
Q
I
STBY
V
IL
V
IH
I
H
I
L
θ
JA
Output = 0V
Output = -1V
Quiescent Current
—
—
—
—
0
2.0
—
—
—
—
—
—
—
-5
5
µA
mA
mA
µA
Standby Quiescent Current
SD Pin Logic Input Threshold
Voltage
SD Pin Logic Input Current
SD Pin Input Current
Thermal Resistance Junction to
Ambient
Thermal Resistance Junction to
Case
θ
JC
Notes:
°
C/W
4. Test condition: Device mounted with copper area of approximately 3 inch
2
, no air flow.
5. Maximum voltage applied to V
SD
is the lower of V
IN
or 16V.
AP1506
Document number: DS31015 Rev. 8 - 2
5 of 14
www.diodes.com
December 2017
© Diodes Incorporated
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