uP1734
1.0MHz, 5.0A, High-Efficiency
Synchronous-Rectified Buck Converter
Features
General Description
The uP1734 is a high efficiency synchronous-rectified buck
converter with internal power switches. Fixed 1.0MHz
PWM operation allows possible smallest output ripple and
external component size. With high conversion efficiency
and small package, the uP1734 is ideally suitable for
portable devices and USB/PCIE-based interface cards,
where PCB area is especially concerned.
2.6V to 5.5V Input Voltage Range
Adjustable Output from 0.6V to VIN
Peak 5.0A Output Current
+
Accurate Reference: 0.6V ( 1%)
Up to 95% Conversion Efficiency
Low Quiescent Current
With internal low RDS(ON) switches, the uP1734 is capable
of delivering peak 5.0A output current over a wide input
voltage range from 2.6V to 5.5V. The output voltage is
adjustable from 0.6V to VIN by a voltage divider.
Integrated Low RDS(ON) Upper and Lower MOSFET
Switches: 70mΩ and 50mΩ
Current Mode PWM Operation
Fixed Frequency : 1.0MHz
Other features include internal soft-start, chip enable, over-
voltage, under-voltage, over-temperature and over-current
protections. The uP1734 is available in space-saving
WDFN3x3-10L and PSOP-8L packages.
100% Maximum Duty Cycle for Lowest Dropout
Internal Soft-Start
Over Voltage and Under Voltage Protection
Over Temperature and Over Current Protection
WDFN3x3-10L and PSOP-8L Packages
RoHS Compliant and Halogen Free
Ordering Information
Order Number
uP1734PDDA
uP1734QDDA
uP1734PSW8
Package Type
WDFN3x3-10L
WDFN3x3-10L
PSOP-8L
Top Marking
uP1734P
uP1734Q
uP1734P
Applications
Battery-Powered Portable Devices
MP3 Players
Note:
(1) Please check the sample/production availability with
uPI representatives.
(2) 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.
Notebook Computers
Wireless and DSL Modems
Personal Information Appliances
IP Phones
Digital Cameras
802.11 WLAN Power Supplies
FPGA/ASIC Power Supplies
Pin Configuration
Dynamically Adjustable Power Supply for
CDMA/WCDMA Power Amplifiers
NC
LX
1
2
3
4
5
10 VIN
LX
LX
1
2
3
4
5
10 VIN
9
8
7
6
VIN
VDD
NC
9
8
7
6
VIN
VDD
NC
LX
GND
LX
GND
USB-Based xDSL Modems and Other Network
Interface Cards
POK
EN
POK
EN
FB
FB
Point-of-Load Regulation
WDFN3x3-10L
(uP1734P)
WDFN3x3-10L
(uP1734Q)
NC
LX
1
2
3
4
8
7
6
5
GND
VIN
VDD
FB
GND
POK
EN
PSOP-8L
uP1734-DS-F0100, Sep. 2014
www.upi-semi.com
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