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uPI Semiconductor |
uP1712
1MHz, 3.0A, High-Efficiency
Synchronous-Rectified Buck Converter
General Description
Features
The uP1712 is a high efficiency synchronous-rectified buck
converter with internal power switches. Fixed 1MHz PWM
operation allows possible smallest output ripple and
external component size. With high conversion efficiency
and small package, the uP1712 is ideally suitable for
portable devices and USB/PCIE-based interface cards
where PCB area is especially concerned.
With internal low RDS(ON) switches, the uP1712 is capable
of delivering 3.0A output current over a wide input voltage
range from 2.6V to 5.5V. The output voltage is adjustable
from 0.6V to V by a voltage divider. Other features include
IN
internal soft-start, chip enable, over-voltage, under-
voltage, over-temperature and over-current protections.
The uP1712 is available in a space-saving WQFN3x3-
16L or PSOP-8L packages.
Applications
Battery-Powered Portable Devices
MP3 Players
Digital Still Cameras
Wireless and DSL Modems
Personal Information Appliances
802.11 WLAN Power Supplies
FPGA/ASIC Power Supplies
Dynamically Adjustable Power Supply for
CDMA/WCSMA Power Amplifiers
USB-Based xDSL Modems and Other Network
Interface Cards
Point-of-Load Regulation
2.6V to 5.5V Input Voltage Range
Adjustable Output from 0.6V to VIN
Guaranteed 3.0A Output Current
Accurate Reference: 0.6V (+ 1.5%)
Up to 95% Conversion Efficiency
Low Quiescent Current
Integrated Low RDS(ON) Upper and Lower
MOSFET Switches: 85mΩ and 75mΩ
Current Mode PWM Operation
Fixed Frequency: 1MHz
100% Maximum Duty Cycle for Lowest Dropout
Internal Soft-Start
No Schottky Diode Required
Over-Voltage Protection
Under-Voltage Protection for uP1712PQDD and
uP1712PSU8 only
Over-Temperature and Over-Current Protection
WQFN3x3-16L or PSOP-8L Packages
RoHS Compliant and Halogen Free
Ordering Information
Order Number Package Type
Top Marking
uP1712PQDD WQFN3x3-16L
uP1712P
uP1712PSU8
uP1712QSU8
PSOP-8L
uP1712P
uP1712Q
Note: uPI products are compatible with the current IPC/
JEDEC J-STD-020 requirement. They are halogen-free,
RoHS compliant and 100% matte tin (Sn) plating that are
suitable for use in SnPb or Pb-free soldering processes.
Pin Configuration
PGND 1
PGND 2
PGND 3
FB 4
PGND
12 VIN
11 VIN
10 VIN
9 VCC
WQFN3x3-16L
uPI Semiconductor Corp., http://www.upi-semi.com
Rev. P01, File Name: uP1712-DS-P0100
AGND
NC
EN
POK
18
27
PGND
36
45
PSOP - 8
FB
PGND
LX
VIN
1
uP1712
Typical Application Circuit
Active High
VIN
CIN
22uF
R3
10
C3
0.1uF
EN LX
VIN
POK
VCC FB
PGND AGND
uP1712PQDD
2.2uH
100K
R2
100K
C4
Option
R1
100K
VOUT
COUT
44uF
Functional Pin Description
Pin No.
uP1712PQDD
uP1712PSU8/
uP1712QSU8
Pin Name Pin Function
1,2,3
7 PGND Power Ground. Connect to the output and input capacitors return.
Feedback Input. This pin is the inverting input of the error amplifier.
4 8 FB FB senses the switcher output through an external resistor divider
network.
5
1
AGND
Signal Ground. Connect the return of all small signal componenets to
this pin.
6,16 2 NC Not Internally Connected.
7 3 EN Chip Enable (Active High). Logic low shuts down the converter.
9
--
VCC
Bias Supply. Supplies power for the internal circuitry. Connect to input
power via low pass filter with decoupling to AGND.
10,11,12
5
Power Supply Input. Input voltage that supplies current to the output
VIN voltage and powers the internal control circuit. Bypass the input voltage
with a minimum 10uF X5R or X7R ceramic capacitor.
13,14,15
6
LX Internal Switches Output. Connect these pins to the output inductor.
8
4
POK
Power OK Indication (for uP1712PQDD and uP1712PSU8 Only).
This pin is set high impedance after soft start end and no fault occurs.
Exposed Pad
Power Ground. The exposed pad should be well soldered to PCB
with multiple vias to ground plane for optimal thermal performance.
uPI Semiconductor Corp., http://www.upi-semi.com
Rev. P01, File Name: uP1712-DS-P0100
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