AP1518 Datasheet PDF - Anachip

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AP1518
Anachip

Part Number AP1518
Description PWM Buck DC/DC Converter
Page 12 Pages


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300KHz, 3A PWM Buck DC/DC Converter
AP1518
„ Features
- Adjustable version output voltage range, 0.8V to
18V+4%
- 300KHz +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
- TO220-5L and TO263-5L Pb-Free packages
- Low power standby mode
- Built-in switching transistor on chip
„ Applications
- Simple High-efficiency step-down regulator
- On-card switching regulators
- Positive to negative converter
„ General Description
The AP1518 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 component, 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 VFB is down to 0.5V below, the
switching frequency will be reduced. The AP1518
series operate at a switching frequency of 300KHz
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
packages are available in a standard 5-lead
TO-220 package or a 5-lead TO-263.
„ Pin Assignments
( Top View )
Metal Tab GND
TO263-5L
5 SD
4 FB
3 Gnd
2 Output
1 VIN
( Top View )
TO220-5L
5 SD
4 FB
3 Gnd
2 Output
1 VIN
„ Pin Descriptions
Name
VIN
Output
GND
FB
SD
Description
Operating voltage input
Switching output
Ground
Output voltage feedback control
ON /OFF Shutdown
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev.1.1 Oct 29, 2004
1/12



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300KHz, 3A PWM Buck DC/DC Converter
„ Ordering Information
AP1518 X X
Package
T5: TO220-5L
K5: TO263-5L
T5R: TO220-5L(R)
Packing
Blank : Tube
A : Taping
AP1518
„ Block Diagram
SD
Current
Source
bias
FB
0.8V
Reference
2.5V
Regulator
Start
up
200mV
220mV
Com+_p
A+_mp
Frequecy
compen-
sation
Comp
+
Comp
+
Pre-driver
300kHz
OSC.
Thermal
Shutdown
VIN
3A
Switch
Output
Gnd
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Oct 29, 2004
2/12



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300KHz, 3A PWM Buck DC/DC Converter
AP1518
„ Absolute Maximum Ratings
Symbol
VCC
VSD
VFB
VOUT
PD
TST
TOP
VOP
Parameter
Supply Voltage
ON /OFF Pin input voltage
Feedback Pin voltage
Output voltage to Ground
Power dissipation
Storage temperature
Operating temperature
Operating voltage
Rating
+24
-0.3 to +18
-0.3 to +18
-1
Internally limited
-65 to +150
-40 to +125
+4.5 to +22
Unit
V
V
V
V
W
oC
oC
V
„ Electrical Characteristics (All Output Voltage Versions)
Unless otherwise specified, VIN=12V, ILOAD = 0.5A
Symbol
Parameter
Conditions
IFB
Feedback bias current
VFB=0.8V
(Adjustable version only)
FOSC Oscillator frequency
FSCP
VSAT
DC
ICL
IL
IQ
ISTBY
VIL
VIH
Oscillator frequency
short circuit protect
Saturation Voltage
of When current limit occurred
and VFB < 0.5V, Ta=25 oC
IOUT=3A
No outside circuit
Max. Duty Cycle (ON)
Min. Duty Cycle (OFF)
VFB=0V force driver on
VFB=0V force driver on
VFB=12V force driver off
Peak current
Current limit
No outside circuit
Output = 0V
Output
leakage
Output =-1V current
Quiescent Current
VFB=0 force driver on
No outside circuit
VFB=12 force driver off
VIN=22V
VFB=12 force driver off
Standby Quiescent
Current
ON /OFF pin logic input
threshold voltage
ON /OFF pin=5V
VIN=22V
Low (regulator ON)
High (regulator OFF)
Min.
255
220
10
3.6
-
2.0
Typ.
-10
300
30
1.4
100
0
4.5
-5
5
70
1.3
IH
ON /OFF pin logic
input current
VLOGIC=2.5V (OFF)
IL
ON /OFF pin input
current
VLOGIC=0.5V (ON)
-0.1
ΘJC Thermal Resistance
TO220-5L Junction to
TO263-5L case
2.5
3.5
Thermal Resistance
ΘJA With copper area of
approximately 3 in2
TO220-5L Junction to
TO263-5L ambient
28
23
Specifications with boldface type are for full operating temperature range, the other type are for TJ=25ºC.
Max.
-50
-100
345
345
50
1.6
1.7
5.5
6.5
-200
10
150
200
0.6
-
-0.01
-1
Unit
nA
KHz
KHz
V
%
A
uA
mA
mA
uA
V
uA
oC/W
oC/W
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Oct 29, 2004
3/12



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300KHz, 3A PWM Buck DC/DC Converter
AP1518
„ Electrical Characteristics (Continued)
Sym. Parameter
Conditions
Typ.
Limit
VFB
Output
Feedback
5V < VIN < 22V
0.2A < ILOAD < 3A
0.8
0.784/0.768
0.816/0.832
η
Efficiency
VOUT programmed for 3V
VIN = 12V, ILOAD=3A
74
AP1518
η
Efficiency
VOUT programmed for 3.3V
VIN = 12V, ILOAD=3A
75
η
Efficiency
VOUT programmed for 5V
VIN = 12V, ILOAD=3A
80
η
Efficiency
VOUT programmed for 12V
VIN = 16V, ILOAD = 3A
89
Specifications with boldface type are for full operating temperature range, the other type are for TJ=25ºC.
Unit
V
VMIN
VMAX
%
%
%
%
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Oct 29, 2004
4/12



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