NCP81044 PDF даташит
Спецификация NCP81044 изготовлена «ON Semiconductor» и имеет функцию, называемую «Low Voltage Synchronous Buck Controller». |
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Детали детали
Номер произв | NCP81044 |
Описание | Low Voltage Synchronous Buck Controller |
Производители | ON Semiconductor |
логотип |
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NCP81044
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Low Voltage Synchronous
Buck Controller
The NCP81044 is a PWM controller designed to operate from a 5 V
or 12 V supply. These devices are capable of producing an output
voltage as low as 0.8 V. These 8−pin devices provide an optimal level
of integration to reduce size and cost of the power supply. The
NCP81044 provides a 1 A gate driver design and an internally set
275 kHz oscillator. In addition to the 1 A gate drive capability, other
efficiency enhancing features of the gate driver include adaptive
non−overlap circuitry. The devices also incorporate an externally
compensated error amplifier and a capacitor programmable soft−start
function. Protection features include programmable short circuit
protection and under voltage lockout (UVLO). The NCP81044 comes
in an 8−pin SOIC package.
Features
• Input Voltage Range from 4.5 to 13.2 V
• 275 kHz Internal Oscillator
• Boost Pin Operates to 30 V
• Voltage Mode PWM Control
• 0.8 V ±1.0 % Internal Reference Voltage
• Adjustable Output Voltage
• Capacitor Programmable Soft−Start
• Internal 1 A Gate Drivers
• 80% Max Duty Cycle
• Input Under Voltage Lockout
• Programmable Current Limit
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
• Graphics Cards
• Desktop Computers
• Servers / Networking
• DSP & FPGA Power Supply
• DC−DC Regulator Modules
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MARKING DIAGRAM
8
1
8
SOIC−8
81044
D SUFFIX
CASE 751
ALYW
G
1
81044 = Specific Device Code
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Device
PIN CONNECTIONS
BST 1
TG 2
GND 3
BG 4
8 PHASE
7 COMP/DIS
6 FB
5 VCC
(Top View)
ORDERING INFORMATION
Device
Package
Shipping†
NCP81044DR2G SOIC−8 2500/Tape & Reel
(Pb−Free)
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
This document contains information on a product under development. ON Semiconductor
reserves the right to change or discontinue this product without notice.
© Semiconductor Components Industries, LLC, 2012
June, 2012 − Rev. P0
1
Publication Order Number:
NCP81044/D
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NCP81044
12 V
3.3 V
VCC
BST
FB
COMP/DIS
TG
PHASE
GND
BG
Figure 1. Typical Application Diagram
VOUT
FB 6
- GM
+
0.8 V
(VREF)
COMP/DIS
7
+
-
Clock
Ramp
OSC
OSC
POR
UVLO
FAULT
LATCH SCP
R
PWM
OUT
Q
S
FAULT
VOCTH
+
-
+
-
2V
+
-
VCC
FAULT
5 VCC
1 BST
2 TG
8 PHASE
4 BG
Rset
3
GND
Figure 2. Detailed Block Diagram
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NCP81044
PIN FUNCTION DESCRIPTION
Pin No. Symbol
Description
1 BST Supply rail for the floating top gate driver. To form a boost circuit, use an external diode to bring the
desired input voltage to this pin (cathode connected to BST pin). Connect a capacitor (CBST) between this pin
and the PHASE pin. Typical values for CBST range from 0.1 mF to 1 mF. Ensure that CBST is placed near the IC.
2 TG Top gate MOSFET driver pin. Connect this pin to the gate of the top N−Channel MOSFET.
3
GND
IC ground reference. All control circuits are referenced to this pin.
4 BG Bottom gate MOSFET driver pin. Connect this pin to the gate of the bottom N−Channel MOSFET.
5 VCC Supply rail for the internal circuitry. Operating supply range is 4.5 V to 13.2 V. Decouple with a 1 mF
capacitor to GND. Ensure that this decoupling capacitor is placed near the IC.
6 FB This pin is the inverting input to the error amplifier. Use this pin in conjunction with the COMP pin to
compensate the voltage−control feedback loop. Connect this pin to the output resistor divider (if used) or dir-
ectly to Vout.
7 COMP/DIS Compensation Pin. This is the output of the error amplifier (EA) and the non−inverting input of the PWM com-
parator. Use this pin in conjunction with the FB pin to compensate the voltage−control feedback loop. The com-
pensation capacitor also acts as a soft−start capacitor. Pull this pin low for disable.
8 PHASE Switch node pin. This is the reference for the floating top gate driver. Connect this pin to the source of the top
MOSFET.
ABSOLUTE MAXIMUM RATINGS
Pin Name
Main Supply Voltage Input
Bootstrap Supply Voltage Input
Switching Node (Bootstrap Supply Return)
High−Side Driver Output (Top Gate)
Low−Side Driver Output (Bottom Gate)
Feedback
COMP/DISABLE
Symbol
VCC
BST
PHASE
TG
BG
FB
COMP/DIS
VMAX
15 V
35 V wrt/PGND
40 V < 50 ns wrt/PGND
15 V wrt/SW
35 V
40 V < 50 ns
30 V wrt/GND
15 V wrt/PHASE
15 V
5.5 V
5.5 V
VMIN
−0.3 V
−0.3 V
−0.3 V
−0.3 V
−5.0 V
−10 V for < 200 ns
−0.3 V wrt/PHASE
−2 V < 200 ns wrt/PHASE
−0.3 V
−5.0 V for < 200 ns
−0.3 V
−0.3 V
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Thermal Resistance, Junction−to−Ambient
RqJA
165 °C/W
Thermal Resistance, Junction−to−Case
RqJC
45 °C/W
Operating Junction Temperature Range
TJ
0 to 125
°C
Operating Ambient Temperature Range
TA
0 to 70
°C
Storage Temperature Range
Tstg
−55 to +150
°C
Lead Temperature Soldering (10 sec): Reflow (SMD styles only) Pb−Free
260 °C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
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