Not Recommended for New Design
AP1516
150KHz, 3A PWM Buck DC/DC Converter + 1A Ultra Low
Drop Regulator
Features
General Description
* Channel 1: simple switch
- Adjustable version output voltage range, 1.23V to
18V+4% & Fixed 3.3V version
- 150KHz +20% fixed switching frequency
- Voltage mode non-synchronous PWM control
- ON/OFF shutdown control input
- Operating voltage can be up to 20V
- Output load current: 3A
- Low power standby mode
* Channel 2: ultra low drop regulator
- Adjustable output voltage
- 0.6V Maximum Dropout voltage at 1.0A Load
current
- Fast transient response
- Good noise rejection
* Channel 1 & Channel 2
- SOP-16L Pb-free package
- Built-in switching transistor on chip
- Thermal-shutdown and current-limit protection of
each channel
The Channel 1 is a step-down DC/DC converter,
and own the ability of driving a 3A load without
additional transistor component. 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 against 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 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 +20% on the oscillator
frequency.
The channel 2 is a 1A regulator with extremely low
dropout voltage. This product is specifically
designed to provide well regulated supply for
applications requiring 2.8V or lower voltages from
3.3V power supplies where high efficiency of a
switcher can be achieved without the cost and
complexity associated with switching regulator.
Applications
- PC Motherboard
- LCD Monitor
- Graphic Card
- DVD-Video Player
- NIC/Switch
- Telecom Equipment
- ADSL Modem
- Printer and other Peripheral Equipment
Pin Assignments
Pin Descriptions
( Top View )
Name
GND
1
16
GND
VOUT1
2
15
3
14
FB1
SD1
VIN2
VOUT2
VOUT2
4
13
GND
GND
VIN1
VB
VIN2
VOUT1
VOUT2
FB1
FB2
SD1
VSENSE2
GND
VIN1
VB
12 VSENSE2
11 FB2
10 V
OUT2
5
6
7
8
9
VOUT2
SOP-16L
Description
Operating voltage input of channel 1
Channel 2 bias voltage
Main power source of channel 2
Channel 1 switching output
Channel 2 output
Output1 voltage feedback control
Output2 voltage feedback control
Channel 1 ON/OFF shutdown
Channel 2 output sense pin
Ground
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 May 23, 2005
1/10
Not Recommended for New Design
AP1516
150KHz, 3A PWM Buck DC/DC Converter + 1A Ultra Low
Drop Regulator
Ordering Information
AP1516 XX X X
Output version
Package
Packing
Ch1: Blank : Adjustable
-33 : 3.3V
S: SOP-16L
Blank : Tube
A : Taping
Block Diagram
SD
VIN1
200mV
Current
Source
bias
1.235V
Reference
2.5V
Regulator
220mV
Start
up
+
Comp
_
_
Comp
+
Frequecy
compensation
_
FB1
+
_Amp
Comp
+
Pre-driver
3A
Switch
VOUT1
150kHz
OSC.
Thermal
Limit
VIN2
GND
VOUT2
VB
VSENSE2
+
1.25V
_
+
+
+
CURRENT
LIMIT
_
THERMAL
SHUTDOWN
FB2
Anachip Corp.
www.anachip.com.tw
Rev.1.1 May 23, 2005
2/10
Not Recommended for New Design
AP1516
150KHz, 3A PWM Buck DC/DC Converter + 1A Ultra Low
Drop Regulator
Absolute Maximum Ratings
Symbol
VIN1, B
VIN2
VSD
VFB1
VOUT1
PD
TST
TOP
VOP
Parameter
Supply Voltage
Supply Voltage
ON/OFF Pin Input Voltage
Feedback Pin Voltage
Output Voltage to Ground
Power Dissipation
Storage Temperature
Operating Temperature
Operating Voltage
Rating
+22
+14
-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
V
W
o
C
o
C
V
Electrical Characteristics (All Output Voltage Versions)
Unless otherwise specified, VIN2=12V for 3.3V, ILOAD = 0.5A
Sym.
IB1
Parameter
Feedback Bias Current
FOSC
Oscillator Frequency
FSCP
Oscillator Frequency of Short
Circuit Protect
VSAT1
Saturation Voltage
DC
Max. Duty Cycle (ON)
Min. Duty Cycle (OFF)
ICL1
Current Limit
IL
IQ
ISTBY
VIL
VIH
IH
IL
Output
Leakage
Output = -1 Current
Quiescent Current
Standby Quiescent
Current
ON/OFF Pin Logic Input
Threshold Voltage
ON/OFF Pin Logic Input
Current
ON/OFF Pin Input Current
Output = 0
Conditions
VFB1=1.3V
(Adjustable version only)
When
current
limit
occurred and VFB1 <
0.5V, Ta=25 oC
IOUT1=2A
No outside circuit
VFB1=0V force driver on
VFB=0V force driver on
VFB=12V force driver off
Peak current
No outside circuit
VFB1=0V force driver on
No outside circuit
VFB1=12V force driver off
VIN1=22V
VFB1=12V force driver off
ON/OFF pin=5V
VIN1=22V
Low (regulator ON)
High (regulator OFF)
Min.
Typ.
-10
127
110
150
5
15
θJC
Thermal Resistance
θJA
Thermal Resistance with
Junction to
Copper Area of Approximately SOP-16L
ambient
2
2
15 in + 15 in
Unit
25
KHz
nA
KHz
1.4
1.25
V
1.5
100
0
%
3.5
A
-200
-5
5
70
2.0
1.3
VLOGIC=2.5V (OFF)
VLOGIC=0.5V (ON)
Junction to
SOP-16L
case
Max.
-50
-100
173
173
uA
mA
mA
10
150
200
0.6
-
uA
V
-0.01
-0.1
uA
-1
10
o
40
o
C/W
C/W
Anachip Corp.
www.anachip.com.tw
Rev.1.1 May 23, 2005
3/10
Not Recommended for New Design
AP1516
150KHz, 3A PWM Buck DC/DC Converter + 1A Ultra Low
Drop Regulator
Electrical Characteristics (Continued)
o
o
Unless otherwise specified, these specifications apply over, CIN=1uF, COUT=10uF, and TJ=0 to 150 C. Typical value refer to TJ=25 C.
VOUT = VSENSE.
Sym.
VREF
Parameter
Test Condition
o
TJ=25 C,(VIN2-VOUT2)=0.5V,
Reference Voltage
IO=10mA VB =VIN2+1V
IO2=10mA,
VOUT2+0.5V
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