SY AP1509-SG-13 150khz 2a pwm buck dc/dc converter Datasheet

TIGER ELECTRONIC CO.,LTD
AP1509
AP1509
APPLICATION:
z
Simp le High-efficiency step-down regulato r
z
On-card switching regu lato rs
z
Positive to negative converter
PIN CONFIGURATION
PIN DESCRIPTIONS
Na me
VIN
Output
AP1509
GND
Description
Op eratin g vo ltag e in put
Switching output
Ground
FB
Output voltage feedback control
SD
ON/OF F Sh utdown
BLOCK DIAGRAM
2/6
AP1509
ABSOLUTE MAXIMUM RATINGS
Characteristics
Symbol
VCC
VSD
VFB
VOUT
PD
Tstg
Topr
VOP
Supply Vo ltage
ON/OFF pin input voltage
Feedback pin vo ltage
Output voltage to groun d
Power dissipation
Storage temperature
Operating te mperature
Operating voltage
Valu e
+40
-0.3~+18
-0.3~+18
-1
Internally li mited
-65~+150
-40~+125*
+4 .5 ~+22
Unit
V
V
V
V
W
°C
°C
V
ELECTRICAL CHARACTERISTICS
(Refer to the test circuit, V I N =12V for 3.3V,5V,adjustable version and V I N =18V for the 12 V
version,I L O A D =0.5A)
Characteristics
Symbol
Feedback bias current
IFB
Oscillator frequency
Fosc
Saturation voltage
V S AT
Max.duty cycle(ON)
Min. duty cycle(OFF)
DC
Cu rren t li mit
ICL
Output leakage current
(output=0)
Output leakage current
(output=-1)
Quiescent cu rrent
Standby
quiescent
current
ON/OFF
pin
logic
input
threshold
voltage
ON/OFF
pin
logic
input cu rrent
ON/OF F
pin
input
current
Thermal resistance
Thermal
resistance
with copper area of
approximat ely 3 in 2
IL
Test Conditions
V F B =1.3V
(Adjustable version only)
Min
-10
127
110
IOUT=2A
No outside circuit
V F B =0V force driver on
V F B =0V force driver on
V F B =12V force driver off
Peak current
No outside circuit
V F B =0V force driver on
No outside circuit
V F B =12V force driver off
Typ
150
1.25
nA
KHz
V
A
-200
5
VIL
V F B =12V force driver off
ON/OFF pin=5V
V I N =36V
Low(regulator ON)
VIH
High(regulator OFF)
70
2.0
Unit
%
3
-5
ISTBY
1.5
100
0
V I N =36V
IQ
Max
-50
-100
173
173
1.4
1.3
μA
mA
10
150
200
0.6
IH
V L O G I C =2.5V(OFF)
7
20
IL
V L O G I C =0.5V(ON)
0.01
10
mA
μA
V
μA
ӨJC
Junction to case
15
°C/W
ӨJA
J u n c t io n t o a mb i e n t
70
°C/W
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AP1509
Continue:
Characteristics
AP1509-ADJ
Output feedback
Symbol
VFB
Efficiency
AP1509-3.3V
η
Output voltage
VOUT
Efficiency
AP1509-5V
Output voltage
Efficiency
AP1509-12V
Output voltage
Efficiency
η
VOUT
η
VOUT
η
Test Conditions
4.5V≤V I N ≤36V
0.2A≤I L O A D ≤2A
V O U T programmed for 3V
V I N =12V,I L O A D =2A
4.75V≤V I N ≤36V
0.2A≤I L O A D ≤2A
V I N =12V,I L O A D =2A
7V<V I N <22V
0.2A≤I L O A D ≤2A
V I N =12V,I L O A D =2A
1 5 V≤V I N ≤36V
0.2A≤I L O A D ≤2A
V I N =15V,I L O A D =2A
Min
Typ
Max
Unit
1.193
1.23
1.28
V
76
3.168
3.3
%
3.465
78
4.8
5
%
5.25
83
11.4
12
V
V
%
12.6
90
V
%
FUNCTION DESCRIPTION
Pin Functi on +V I N
This is th e positive input supply for the IC switching regulator. A suitable in pu t bypass
capacitor mu st be presented at this pin to mi nimize voltage tran sien ts and to supply the
switching currents needed by the regulator.
Ground
Circuit ground.
Output
Internal switch. The voltage at this pin switches between (+VIN – VSAT) and
approximat ely – 0.5V, with a duty cycle of approxi mately VOUT / VIN. To mi ni mize
coupling to sensitive circuitry, the PC board copper area connected to this pin should be
mini mized.
Feedback
Senses the regulated output voltage to complete the feedback loop.
SD
Allows the switching regulator circuit to be shutdown using logic level signals thus
dropping the total in put supp ly current to approximately150uA. Pulling this pin below a
threshold vo ltage of approximately 1.3V turn s the regulator on , and pulling this pin above
1.3V (up to a maximu m of18V) shuts the regula to r down. If this shutdo wn feature is no t
needed, the SD pin can be wired to the ground pin.
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AP1509
Thermal Considerations
The SOP8 package needs a heat sink under mo st conditions. Th e size of th e heatsink
depends on the inpu t vo ltage, th e output voltage, th e load current and th e ambient
te mp erature. The AP1509 junction te mp erature rises above ambient te mp erature for a2A lo ad
and different input and output voltages. The data for these curves was taken with the AP1509
(SOP8 package) operating as a buck-switching regulator in an ambient temperature of 25oC
(still air). These temp erature in cre ments are all approximate and are affected by man y
factors. Higher ambient temp eratures requires mo re heat sinker.
For the best thermal performance , wide copper traces and generous a mounts of printed
circuit board copper should be used in the board layout. (One exception is the output
(switch) pin, which should not have large areas of copper.) Large areas of copper provide
the best tran sfer of heat(lower thermal resistance) to the surrounding air, and moving air
lowers the th ermal resistance even further.
Package thermal resist ance an d junction te mperature in cre ments are all approximate.
The in cre ments are affected by a lo t of factors. So me of these factors include board size,
shape, thickness, position, location, and even board temp erature. Other factors are, trace
width, total printed circuit copp er area, copper thickness, single or double-sided,
multi-layer board and the amount of solder on the board.
The effectiv eness of th e PC board to dissipate heat also depends on the size, quantity
and spacing of other components on the board, as well as whether the surrounding air is
still or moving. Fu rthermo re, so me of these co mponents such as the catch diode will add
heat to the PC board and the heat can vary as the input voltage ch anges. For the inducto r,
depending on the physical size, type of core material and the DC resistance, it could either
act as a heat sink taking heat away fro m the board, or it could add heat to the board.
Ordering Information
AP1509 - XX S X - 13
Output Version
Lead Free
Packing
Blank : Adjustable
33 : 3.3V
50 : 5.0V
12 : 12V
L : Lead Free
G : Green
13 : Tape & Reel
Device
AP1509-XXSL-13
AP1509-XXSG-13
Package
Code
S
S
Packaging
(Note 2)
SOP-8L
SOP-8L
13” Tape and Reel
Quantity
Part Number Suffix
2500/Tape & Reel
-13
2500/Tape & Reel
-13
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AP1509
APPLICATION CIRCUIT
Fixed Type Circuit
AP1509
Adj ustable Type Circuit
AP1509
Delay Start Circuit
AP1509
6/6
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