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What is UP6101?

This electronic component, produced by the manufacturer "uPI Semiconductor", performs the same function as "5V/12V Synchronous-Rectified Buck Controller".


UP6101 Datasheet PDF - uPI Semiconductor

Part Number UP6101
Description 5V/12V Synchronous-Rectified Buck Controller
Manufacturers uPI Semiconductor 
Logo uPI Semiconductor Logo 


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uP6101
5V/12V Synchronous-Rectified
Buck Controller
General Description
Features
The uP6101 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 0.6V (uP6101A) or 0.8V (uP6101B/C). This (P)SOP-
8 device operates at fixed 300kHz (uP6101A/B) or 200kHz
(uP6101C) 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, under voltage
protection, over current protection and shutdown function.
With aforementioned functions, this part provides
customers a compact, high efficiency, well-protected and
cost-effective solutions. This part comes to SOP-8 and
PSOP-8 packages.
Applications
† Power Supplies for Microprocessors or
Subsystem Power Supplies
† Cable Modems, Set Top Boxes, and DSL
Modems
† Industrial Power Supplies; General Purpose
Supplies
† 5V or 12V Input DC-DC Regulators
† Low-Voltage Distributed Power Supplies
† Operates from 5V or 12V Supply Voltage
„ 3.3V to 12V VIN Input Range
„ 0.6V or 0.8V to 80% of VIN Output Range
„ 0.6V or 0.8V Internal Reference
„ 1.5% Over Line Voltage and Temperature
† 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)
† 300/200kHz Fixed Frequency Oscillator
† Internal SoftStart
† Integrated Boot Diode
Ordering Information
Order Number Package
Remark
uP6101AS8
SOP-8
0.6V reference voltage;
300kHz switching frequency
uP6101BS8 SOP-8
uP6101BS8-A SOP-8
uP6101BU8 PSOP-8
0.8V reference voltage;
300kHz switching frequency
uP6101CSA8 SOP-8
0.8V reference voltage;
200kHz switching frequency
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.
Pin Configuration & Typical Application Circuit
BOOT
UGATE
GND
LGATE
BOOT
UGATE
GND
LGATE
18
27
36
45
SOP-8
18
27
3 GND 6
45
PSOP-8
PHASE
COMP/EN
FB
VCC
Disable
Enable
PHASE
COMP/EN
FB
VCC
1uF
VCC
5
7 1 BOOT
2 UGATE
8 PHASE
FB
6
4 LGATE
3
GND
VIN
VOUT
uPI Semiconductor Corp., http://www.upi-semi.com
Rev. F01, File Name: uP6101-DS-F0101
1
Free Datasheet http://www.datasheet4u.net/

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UP6101 equivalent
uP6101
internal SS and ramps up to its final level during T3 and T4.
At T4, the reference voltage VREF takes over the behavior
of the error amplifier as the internal SS crosses VREF. The
internal SS keeps ramping up and stay at 4.2V at T5, where
the uP6101A asserts the end of softstart cycle.
Ramp
VREF
COMP/EN
SS
VOUT
Functional Description
VIN
5V/Div
VOUT
0.5V/Div
LGATE
10V/Div
Ix 1A/Div
T1 T2
T3
T4
T5
Time 1ms/Div
COMP
0.5V/Div
VOUT
0.5V/Div
LGATE
10V/Div
Time 1ms/Div
Figure 2. Softstart Behavior of uP6101A.
Power Input Detection
The uP6101 detects PHASE voltage for the present of power
input when the UGATE turns on the first time. If the PHASE
voltage does not exceed 2.0V when the UGATE turns on,
the uP6101 asserts that power input in not ready and stops
the softstart cycle. However, the internal SS continues
ramping up to VDD. Another softstart is initiated after SS
ramps up to VDD. The hiccup period is about 8ms. Figure
3 shows the start up interval where VIN does not present
initially.
Figure 3. Softstart where VIN does not Present Initially.
Output Voltage Selection
The output voltage can be programmed to any level between
the 0.6V internal reference (0.8V for uP6101B/C), up to
the 80% of VIN supply. The lower limitation of output voltage
is caused by the internal reference. The upper limitation of
the output voltage is caused by the maximum available
duty cycle (80% typical). This is to leave enough time for
overcurrent detection. Output voltage out of this range is
not allowed.
An voltage divider sets the output voltage (refer to the
Typical Application Circuit on page 1 for detail). In real
applications, choose R1 in 100~ 10krange and choose
appropriate R2 according to the desired output voltage.
VOUT
=
VREF
×
R1+ R2
R2
=
0.6V
×
R1+ R2
R2
uP6101A
VOUT
=
VREF
×
R1+ R2
R2
=
0.8V ×
R1+ R2
R2
uP6101B/C
Overcurrent Protection (OCP)
The uP6101 detects voltage drop across the lower MOSFET
(VPHASE) for overcurrent protection when it is turned on. If
VPHASE is lower than the user-programmable voltage VOCP,
the uP6101 asserts OCP and shuts down the converter.
The OCP level can be calculated according the on-
resistance of the lower MOSFET used.
IOCP
=
VOCP
RDS(ON)
(A)
uPI Semiconductor Corp., http://www.upi-semi.com
Rev. F01, File Name: uP6101-DS-F0101
5
Free Datasheet http://www.datasheet4u.net/


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