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uP1722P 데이터시트 PDF




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부품번호 uP1722P 기능
기능 High-Efficiency Synchronous-Rectified Buck Converter
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uP1722P 데이터시트, 핀배열, 회로
uP1722P/Q
1.5MHz, 1.3A, High-Efficiency
Synchronous-Rectified Buck Converter
General Description
Features
The uP1722 is a high efficiency synchronous-rectified buck † 2.6V to 5.5V Input Voltage Range
converter with internal power switches. Fixed 1.5MHz PWM † 1.3A Peak Output Current
operation allows possible smallest output ripple and
external component size. With high conversion efficiency † Accurate Reference with +/- 2% Accuracy
and small package, the uP1722 is ideally suitable for
„ 0.6V (uP1722P)
portable devices and USB/PCIE-based interface cards
„ 0.5V (uP1722Q)
where PCB area is especially concerned.
† Up to 95% Conversion Efficiency
With internal low RDS(ON) switches, the uP1722 is capable
of delivering 1.3A peak output current over a wide input
†
Typical Quiescent Current: 60uA
voltage range from 2.6V to 5.5V. The output voltage is † Integrated Low RDS(ON) Upper and Lower MOSFET
adjustable from 0.6V/0.5V (uP1722P/uP1722Q) to VIN by
Switches: 300mΩ and 250mΩ
a voltage divider. Other features include internal soft-start, † Current Mode PWM Operation
chip enable, under-voltage, over-temperature and over-
current protections. The uP1722 is available in space-saving
†
Fixed Frequency: 1.5MHz
WDFN2x2-6L and TSOT23-5L packages with fixed or † 100% Maximum Duty Cycle for Lowest Dropout
adjustable output voltage options.
† Internal Soft-Start
Ordering Information † Under-Voltage Protection
Order Number
uP1722PMT5-XX
uP1722QMT5-XX
Package
TSOT23-5L
TopMarking
N45PXX
N45QXX
† Over-Temperature and Over-Current Protection
† Space-Saving WDFN2x2-6L and TSOT23-5L
packages
† RoHS Compliant and Halogen Free
uP1722PDE6-XX WDFN2x2-6L
XX: Output Voltage
Applications
00: adjustable
† Battery-Powered Portable Devices
10: 1.0V; 12: 1.2V; 15: 1.5V; 18: 1.8V;
25: 2.5V; 33: 3.3V
„ MP3 Players
„ Digital Still Cameras
Note: uPI products are compatible with the current IPC/
JEDEC J-STD-020 requirement. They are halogen-free,
„ Wireless and DSL Modems
RoHS compliant and 100% matte tin (Sn) plating that are
„ Personal Information Appliances
suitable for use in SnPb or Pb-free soldering processes.
„ Cellular Telephones
† 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
uP1722PQ-DS-P0000, May 2012
www.upi-semi.com
1




uP1722P pdf, 반도체, 판매, 대치품
uP1722P/Q
Functional Description
The uP1722 is a high efficiency synchronous-rectified buck
converter with internal power switches. Fixed 1.5MHz PWM
operation allows possible smallest output ripple and
external component size. With high conversion efficiency
and small package, the uP1722 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 uP1722 is capable
of delivering 1.3A peak output current over a wide input
voltage range from 2.6V to 5.5V. The output voltage is
adjustable from 0.6V/0.5V to VIN by a voltage divider. Other
features include internal soft-start, chip enable, overvoltage,
under-voltage, over-temperature and over-current
protections. The uP1722 is available in space-saving
WDFN2x2-6L and TSOT23-5 packages, in an adjustable
version and fixed output voltages.
Input Supply Voltage, VIN
VIN pin provides power for the internal control circuit and
supplies current to the output voltage. The supply voltage
range is from 2.6V to 5.5V. A power on reset (POR)
continuously monitors the input supply voltage. The POR
level is typically 2.5V at VIN rising.
The uP1722 draws pulsed current with sharp edges each
time the upper switch turns on, resulting in voltage ripples
and spikes at supply input. A minimum 1uF ceramic
capacitor with shortest PCB trace is highly recommended
for bypassing the supply input.
Chip Enable/Disable and Soft Start
Pulling EN pin lower than 0.4V shuts down the uP1722
and reduces its quiescent current lower than 1uA. In the
shutdown mode, both upper and lower switches are turned
off.
Pulling EN pin higher than 1.5V enables the uP1722 and
initiates the soft start cycle. The uP1722 limits the in-rush
current at start-up. This prevents unwanted shutdown
otherwise may be triggered by voltage drop due to large
inrush current.
PWM Operation
The uP1722 adopts slope-compensated, current mode
PWM control capable of achieving 100% duty cycle. During
normal operation, the uP1722 operates at PWM mode to
regulate output voltage by transferring the power to the
output voltage cycle by cycle at a constant 1.5MHz
frequency. The uP1722 turns on the upper switch at each
rising edge of the internal oscillator allowing the inductor
current to ramp up linearly. The switch remains on until
either the current-limit is tripped or the PWM comparator
turns off the switch for regulating output voltage. The upper
switch current is sensed, slope compensated and
compared with the error amplifier output COMP to determine
the adequate duty cycle. The FB pin senses output
feedback voltage from an external resistive divider.
When the load current increases, it causes a slight
decrease in the feedback voltage relative to the 0.6V/0.5V
reference, which in turn causes the error amplifier output
voltage to increase until the average inductor current
matches the new load current.
Low Dropout Mode
The uP1722 increases duty cycle to maintain output voltage
within its regulation as the supply input drops gradually in
the battery-powered applications. The uP1722 operates with
100% duty cycle and enters low dropout mode as the supply
input approaches the output voltage. This maximizes the
battery life.
Current Limit Function
The uP1722 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 (1.5A 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 the uP1722 could provide,
the uP1722 can not regulate the output voltage. Eventually
under voltage protection will be triggered and shuts down
the uP1722 if VFB is too low.
Under Voltage Protection
Undervoltage Protection is triggered if the output voltage is
lower than 17% of its target level and shuts down uP1722.
The uP1722 can only be reset by POR of VIN or toggling
the EN pin.
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/0.5 with 2.0% accuracy. In real
REF
applications, a 22pF feedforward ceramic capacitor is
recommended in parallel with R2 for better transient
response. The feedforward is internally implemented for
the fixed voltage versions.
4 uP1722PQ-DS-P0000, May 2012
www.upi-semi.com

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uP1722P 전자부품, 판매, 대치품
uP1722P/Q
Typical Operation Characteristics
This page is intentionally left blank and will be updated later.
uP1722PQ-DS-P0000, May 2012
www.upi-semi.com
7

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High-Efficiency Synchronous-Rectified Buck Converter

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