AP1516 Datasheet, PDF (1/10 Pages) Anachip Corp – 150KHz, 3A PWM Buck DC/DC Converter + 1A Ultra Low

150KHz, 3A PWM Buck DC/DC Converter + 1A Ultra Low
Drop Regulator
AP1516
„ Features
* 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
„ Applications
- PC Motherboard
- LCD Monitor
- Graphic Card
- DVD-Video Player
- NIC/Switch
- Telecom Equipment
- ADSL Modem
- Printer and other Peripheral Equipment
„ Pin Assignments
( Top View )
GND 1
GND ²
V_OUT1 3
FB1 ⁴
SD1 ⁵
V_IN2 6
V_OUT2 7
V_OUT2 ⁸
SOP-16L
16 _GND
15 GND
14 _VIN1
13 _VB
12 V_SENSE2
11 FB2
10 V_OUT2
9 _VOUT2
„ General Description
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 V_FB 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.
„ Pin Descriptions
Name
Description
V_IN1
V_B
V_IN2
V_OUT1
V_OUT2
FB1
FB2
SD1
V_SENSE2
GND
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
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