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uPI Semiconductor
uPI Semiconductor

uP7701 Datasheet Preview

uP7701 Datasheet

3A Ultra Low Dropout Linear Regulator

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uP7701 pdf
uP7701
3A Ultra Low Dropout Linear Regulator
General Description
Features
The uP7701 is a 3A ultra low dropout linear regulator
specifically designed for motherboard,notebook and graphic
card applications. This device works with dual supplies, a
control input for the control circuitry and a power input as
low as 1.0V for providing current to output. The uP7701
delivers high-current and ultra-low-drop output voltage as
low as 0.8V for applications where VOUT is very close to
VIN.
The uP7701 features comprehensive control and protection
functions: a power on reset (POR) circuit for monitoring
both control and power inputs for proper operation; an EN
input for enabling or disabling the device, a power OK with
time delay for indicating the output voltage status, a
foldback current limit function, and a thermal shutdown
function.
The uP7701 is available in PSOP-8 package with very low
thermal resistance.
Applications
† Desktop PCs, Notebooks, and Workstations
† Graphic Cards
† Low Voltage Logic Supplies
† Microprocessor and Chipset Supplies
† Split Plane Microprocessor Supplies
† Advanced Graphics Cards Supplies
† SoundCards and Auxiliary Power Supplies
† SMPS Post Regulators
† Works with 1.0V~5.5V VIN
„ Adjustable Output Voltage, Down to 0.8V
„ 1.5% Initial Accuracy
„ Excellent Line and Load Regulation
† 3A Guaranteed Output Current
„ 300mV @ 3A Dropout Voltage
† Very Low On-Resistance
„ 100mtypical
† VOUT Pull Low Resistance when Disabled
† Low Reverse Leakage (Output to Input )
† VOUT Power OK Signal
† Fast Transient Response
† Low External Component Count
† Low Cost and Easy to Use
† Enable Pin
† Over Current and Over Temperature Protection
Ordering Information
Order Number
uP7701U8
Package Type
PSOP-8
Remark
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
POK
EN
VIN
CNTL
18
27
GND
36
45
uP7701
GND
FB
VOUT
NC
5VCC
R4
10R
VIN
C1
1uF
C2
4.7uF
CNTL
EN
2
4
POK
1
VIN
3
VOUT
6
NC 5
FB
7
8
GND
R3
10K
R2
12.5K
R1
10K
VOUT
C4
option
C3
10uF
uPI Semiconductor Corp., http://www.upi-semi.com
Rev. 00, 2007, April
1



uPI Semiconductor
uPI Semiconductor

uP7701 Datasheet Preview

uP7701 Datasheet

3A Ultra Low Dropout Linear Regulator

No Preview Available !

uP7701 pdf
uP7701
Functional Pin Description
Pin No.
1
2
3
4
5
6
7
8
Exposed
Pad
Name Pin Function
POK
Power OK Indication. This pin is an open-drain output and is set high impedance once VOUT
reaches 92% of its rating voltage.
EN
Enable Input. Pulling this pin below 0.4V turns the regulator off, reducing the quiescent current
to a fraction of its operating value.
Input Voltage. This is the drain input to the power device that supply current to the output pin.
Large bulk capacitors with low ESR should be placed physically close to this pin o prevent the
VIN input rail from dropping during large load transient. A 4.7uF ceramic capacitor is recommended
at this pin. VIN cannot be forced higher than VCNTL otherwise the current limit function may be false
triggered and disable the output voltage.
CNTL
NC
Supply Input for Control Circuit. This pin provides bias voltage to the control circuitry and
driver for the pass transistor.The driving capability of output current is proportioned to the VCNTL.
For the device to regulate, the voltage on this pin must be at least 1.5V greater than the output
voltage, and no less than VCNTL_MIN.
Not Internally Connected
Output Voltage. This pin is power output of the device. A pull low resistance exists when the
VOUT
device is disabled by pulling low the EN pin. To maintain adequate transient response to large
load change, typical value of 1000uF Al electrolytic capacitor with 10uF ceramic capacitors are
recommended to reduce the effects of current transients on VOUT.
FB
GND
Feedback Voltage. This pin is the inverting input to the error amplifier. A resistor divider from
the output to GND is used to set the regulation voltage as VOUT = 0.8x(R1+R2)/R1 (V)
Ground.
GND
Ground. The exposed pad acts the dominant power dissipation path and should be soldered
to well design PCB pads as described in the Application Informations Chapter.
Functional Block Diagram
EN
CNTL
VIN
2 43
Thermal Limit
Power On
Reset
Softstart &
Control Logic
Current Limit
FB 7
0.8V
6 VOUT
92% VREF
Delay
1
POK
uPI Semiconductor Corp., http://www.upi-semi.com
Rev. 00, 2007, April
8
GND
2


Part Number uP7701
Description 3A Ultra Low Dropout Linear Regulator
Maker uPI Semiconductor
Total Page 11 Pages
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