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PDF uP1712 Data sheet ( Hoja de datos )
| Número de pieza | uP1712 | |
| Descripción | High-Efficiency Synchronous-Rectified Buck Converter | |
| Fabricantes | uPI Semiconductor | |
| Logotipo |  |
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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
1 page  
Output Voltage Setting and Feedback Network
The output voltage can be set from VREF to VIN by a voltage
divider as:
VOUT
=
R1+ R2
R1
× VREF
The internal V is 0.6V with 1.5% accuracy. In real
REF
applications, a 22pF feedforward ceramic capacitor is
recommended in parallel with R2 for better transient
response.
Current Limit Function
The uP1712 continuously monitors the inductor current
for current limit by sensing the voltage drop across the
upper switch when it turns on. When the inductor current
is higher than current limit threshold (5.5A typical), the
current limit function activates and forces the upper switch
turning off to limit inductor current cycle by cycle. If the
load continuously demands more current than what
uP1712 could provide, uP1712 can not regulate the output
voltage. Eventually under voltage protection will be
triggered and shuts down the uP1712 if V is too low.
OUT
Under Voltage Protection
Under voltage Protection is triggered if the FB voltage is
lower than 0.3V and shuts down uP1712. The under
voltage protection is latch-off type and can only be reset
by POR of VCC or toggling the EN pin.
Over Voltage Protection
Over voltage protection (OVP) is triggered if the FB voltage
is higher than 0.8V and forces the uP1712 to continuous
PWM mode that allows the inductor current to be negative.
The voltage control loop will continuously turn on the lower
switch to sink charges from the output capacitor to lower
the output voltage. The lower switch turns off only the
sinking current is higher than it current limit level, typical
2.0A. The uP1712 resumes normal operation if the OVP
is removed.
Over Temperature Protection (OTP)
The OTP is triggered and shuts down the uP1712 if the
junction temperature is higher than 150OC. The OTP is a
non-latch type protection. The uP1712 automatically
initiates another soft start cycle if the junction temperature
drops below 130OC.
uPI Semiconductor Corp., http://www.upi-semi.com
Rev. P01, File Name: uP1712-DS-P0100
uP1712
Functional Description
5
5 Page 
Output Voltage vs. Temperature
1.2500
1.2300
1.2100
1.1900
1.1700
1.1500
-40 -20 0 20 40 60 80 100 120 140 160
Temperature (OC)
VIN = 3.3, VOUT = 1.2V, CIN = 22uF, COUT = 44uF,
L = 2.2uH, No Load
Efficiency vs. Output Current
95
90
85
80
75
70
65
60
55
50
1
10
100
1000
10000
Output Current (mA)
V = 3.3, V = 1.2V, C = 22uF, C = 44uF,
IN OUT
IN
OUT
L = 2.2uH
uP1712
Typical Operation Characteristics
Switching Frequency vs. Temperature
1.035
1.030
1.025
1.020
1.015
1.010
1.005
1.000
0.995
0.990
-40 -20 0 20 40 60 80 100 120 140 160
Temperature (OC)
VIN = 3.3, VOUT = 1.2V, CIN = 22uF, COUT = 44uF,
L = 2.2uH, No Load
uPI Semiconductor Corp., http://www.upi-semi.com
Rev. P01, File Name: uP1712-DS-P0100
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet uP1712.PDF ] | |
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