UP6109 PDF даташит
Спецификация UP6109 изготовлена «uPI Semiconductor» и имеет функцию, называемую «5V/12V Synchronous-Rectified Buck Controller». |
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Детали детали
Номер произв | UP6109 |
Описание | 5V/12V Synchronous-Rectified Buck Controller |
Производители | uPI Semiconductor |
логотип |
15 Pages
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uP6109
5V/12V Synchronous-Rectified
Buck Controller with Enable Input
General Description
Features
The uP6109 is a compact synchronous-rectified buck
controller specifically designed to operate from 5V or 12
supply voltage and to deliver high quality output voltage as
low as 0.8V. This (P)SOP-8 device operates at fixed 300
kHz frequency and provides an optimal level of integration
to reduce size and cost of the power supply.
This controller integrates internal MOSFET drivers that
support 12V+12V bootstrapped voltage for high efficiency
power conversion. The bootstrap diode is built-in to simplify
the circuit design and minimize external part count.
Other features include internal softstart, undervoltage
protection, overcurrent protection and shutdown function.
With aforementioned functions, this part provides
customers a compact, high efficiency, well-protected and
cost-effective solutions. This part is available in (P)SOP-8
packages.
Ordering Information
Order Number Package Type
Remark
uP6109ASA8
SOP-8
uP6109ASU8 PSOP-8
Note: uPI products are compatible with the current IPC/
JEDEC J-STD-020 and RoHS requirements. They are 100%
matte tin (Sn) plating and suitable for use in SnPb or Pb-
free soldering processes.
Operate from 5V or 12V Supply Voltage
3.3V to 12V V Input Range
IN
0.8 VREF with 1.5% Accuracy
Output Range from VREF to 80% of VIN
Simple Single-Loop Control Design
Voltage-Mode PWM Control
Fast Transient Response
High-Bandwidth Error Amplifier
0% to 80% Duty Cycle
Lossless, Programmable Overcurrent Protection
Uses Lower MOSFET RDS(ON)
300 kHz Fixed Frequency Oscillator
Internal Soft Start
Integrated Bootstrap Diode
Applications
Power Supplies for Microprocessors or
Subsystem Power Supplies
Cable Modems, Set Top Boxes, and xDSL
Modems
Industrial Power Supplies; General Purpose
Supplies
5V or 12V Input DC-DC Regulators
Low Voltage Distributed Power Supplies
Pin Configuration & Typical Application Circuit
VIN
BOOT
UGATE
GND
LGATE
BOOT
UGATE
GND
LGATE
18
27
36
45
SOP-8
18
27
GND
36
45
PSOP-8
PHASE
EN
FB
VCC
Disable
Enable
EN
7
PHASE
EN
FB
VCC
FB
6
Option
VCC
5
BOOT
1
UGATE
2
PHASE
8
LGATE
4
3
GND
VOUT
uPI Semiconductor Corp., http://www.upi-semi.com
Rev. F00, File Name: uP6109-DS-F0000
1
Free Datasheet http://www.Datasheet4U.com
No Preview Available ! |
uP6109
Functional Pin Description
No. Pin Name Pin Function
Bootstrap Supply for the floating upper gate driver. Connect the bootstrap capacitor CBOOT
1
BOOT
between BOOT pin and the PHASE pin to form a bootstrap circuit. The bootstrap capacitor
provides the charge to turn on the upper MOSFET. Typical values for CBOOT range from 0.1uF to
0.47uF. Ensure that CBOOT is placed near the IC.
Upper Gate Driver Output. Connect this pin to the gate of upper MOSFET. This pin is monitored
2 UGATE by the adaptive shoot-through protection circuitry to determine when the upper MOSFET has
turned off.
3
GND
Signal and Power Ground for the IC. All voltages levels are measured with respect to this pin.
Tie this pin to the ground island/plane through the lowest impedance connection available.
Lower Gate Driver Output. Connect this pin to the gate of lower MOSFET. This pin is monitored
4 LGATE by the adaptive shoot-through protection circuitry to determine when the lower MOSFET has turn
off.
Supply Voltage. This pin provides the bias supply for the uP6109 and the lower gate driver. The
5
VCC
supply voltage is internally regulated to 4VDD for internal control circuit. Connect a well-decoupled
4.5V to 13.2V supply voltage to this pin. Ensure that a decoupling capacitor is placed near the
IC.
Feedback Voltage. This pin is the inverting input to the error amplifier. A resistor divider from
6 FB the output to GND is used to set the regulation voltage. Use this pin in combination with the
COMP/EN pin to compensate the voltage control feedback loop of the converter.
7
EN
Chip Enable. Pulling this pin lower than 0.3V disables the controller and causes the oscillator to
stop, the UGATE and LGATE outputs to be held low.
PHASE Switch Node. Connect this pin to the source of the upper MOSFET and the drain of the
lower MOSFET. This pin is used as the sink for the UGATE driver, and to monitor the voltage
8
PHASE
drop across the lower MOSFET for over current protection. This pin is also monitored by the
adaptive shoot-through protection circuitry to determine when the upper MOSFET has turned off.
A Schottky diode between this pin and ground is recommended to reduce negative transient
voltage which is common in a power supply system.
uPI Semiconductor Corp., http://www.upi-semi.com
Rev. F00, File Name: uP6109-DS-F0000
2
Free Datasheet http://www.Datasheet4U.com
No Preview Available ! |
Internal
4VDD Regulator
FB 6
Soft
Start
SS
0.8V Error
Amplifier
VCC
EN 7
30K
0.3V
Enable
uP6109
Functional Block Diagram
VCC
5
1 BOOT
POR
VOCP
OCP
Comparator
PWM
Gate
Control
Logic
VCC
2 UGATE
8 PHASE
Oscillator
4 LGATE
3
GND
uPI Semiconductor Corp., http://www.upi-semi.com
Rev. F00, File Name: uP6109-DS-F0000
3
Free Datasheet http://www.Datasheet4U.com
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