AP1516
150KHz, 3A PWM Buck DC/DC Converter + 1A Ultra Low
Drop Regulator
Features
General Description
* Channel 1: simple switch
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
- 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
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
- 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
frequency will be reduced.
The switching
- Good noise rejection
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.
* Channel 1 & Channel 2
- SOP-16L Pb-free package
- Built-in switching transistor on chip
- Thermal-shutdown and current-limit protection of
each channel
Applications
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.
- 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
Description
GND
GND
VOUT1
FB1
SD1
VIN2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
GND
GND
VIN1
VB
VSENSE2
FB2
VIN1
VB
Operating voltage input of channel 1
Channel 2 bias voltage
VIN2
Main power source of channel 2
VOUT1 Channel 1 switching output
VOUT2 Channel 2 output
FB1
FB2
SD1
Output1 voltage feedback control
Output2 voltage feedback control
Channel 1 ON/OFF shutdown
VOUT2
VOUT2
VOUT2
VOUT2
VSENSE2 Channel 2 output sense pin
GND Ground
SOP-16L
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
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