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PDF NCP81148 Data sheet ( Hoja de datos )
| Número de pieza | NCP81148 | |
| Descripción | Synchronous Buck Controller | |
| Fabricantes | ON Semiconductor | |
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NCP81148
Advance Information
Synchronous Buck Controller
with Auto Power Saving
Mode and Built-In LDO
NCP81148 is a dual synchronous buck controller that is optimized
for converting the battery voltage or adaptor voltage into multiple
power rails required in desktop and notebook system. NCP81148
consists of two buck switching controllers with fixed 5.0 V output on
channel 2, 3.3 V on channel 1 and two on−board LDOs with three
outputs: 5 V / 60 mA and 3.3 V or 12 V / 10 mA. NCP81148 supports
high efficiency, fast transient response and provides power good
signals. ON Semiconductor proprietary adaptive−ripple control
enables seamless transition from CCM to DCM, where converter runs
at reduced switching frequency with much higher efficiency at light
load. The part operates with supply voltage ranging from 5.5 V to
28 V. NCP81148 is available in a 28−pin QFN package.
Features
• Wide Input Voltage Range: from 5.5 V to 28 V
• Built−in 5 V / 60 mA LDO
• Built−in selectable 3.3 V or 12 V / 10 mA LDO
• Three Selectable Fixed Frequency 300 KHz, 400 KHz or 600 KHz
• 180 Interleaved Operation Between the Two Channels in
Continue−Conduction−Mode (CCM)
• Selected Power−Saving Mode/Forced PWM Mode
• Transient−Response−Enhancement (TRE) Control
• Input Supply Voltage Feed Forward Control
• Resistive or Lossless Inductor’s DCR Current Sensing
• Over−Temperature Protection
• Internal Fixed 8.5 ms Soft−Start
• Fixed Output Voltages 5 V and 3.3 V
• Power Good Outputs for Both Channels
• Built−in Adaptive Gate Drivers
• Output Discharge Operation
• Built−in Over−Voltage, Under−Voltage Protection
• Accurate Over−Current Protection
• Thermal Shutdown
Applications
• Desktop / Notebook Computers
• System Power Supplies
• I/O Power Supplies
This document contains information on a new product. Specifications and information
herein are subject to change without notice.
http://onsemi.com
MARKING
DIAGRAM
1
28 PIN QFN, 4x4
MN SUFFIX
CASE 485AR
81148
ALYWG
G
81148
A
L
Y
W
G
= Specific Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
GH2
BST2
SWN2
GL2
PGND2
CSP2
CSN2
28
1
GND
GH1
BST1
SWN1
GL1/FSET
PGND1
CSP1
CSN1
(Top View)
ORDERING INFORMATION
Device
NCP81148MNTWG
Package
QFN−28
(Pb−Free)
Shipping†
4,000 /
Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2014
January, 2014 − Rev. P0
1
Publication Order Number:
NCP81148/D
1 page  
NCP81148
Table 3. ELECTRICAL CHARACTERISTICS
(VIN = 12 V, Vout = 5.0 V, TA = +25°C for typical value; −40°C < TA < 125°C for min/max values unless noted otherwise)
Parameter
Symbol
Test Conditions
Min Typ Max
POWER SUPPLY
Input Supply Voltage
VIN
5.5 28
INTERNAL LDO OUTPUT
5V_LDOOUT Voltage
5V_LDOOUT Current
VIN =12 V, I5V_LDOOUT = 60 mA
VIN =12 V, EN1 = EN2 = 0
4.85 5.0 5.15
100
5V_LDO Switch to Bypass Threshold
4.7 4.95
5V_LDOOUT to 5V_IDOBYP Impedance
LDOBYP = 5 V
1.0
Hysteresis
100 200
LDO2_OUT Voltage
LDO2_EN = VCC, VIN = 15 V,
Load Current = 10 mA
11.4 12 12.6
LDO2_EN = 1/2 VCC, VIN = 15 V,
Load Current = 10 mA
3.2 3.3 3.46
LDO2_OUT Current
10 15
SUPPLY CURRENT
BSTx Quiescent Current
IBST VFB = 1.5 V, EN = 5.0
(No Switching), GH and GL are open
0.3
BSTx Shutdown Supply Current
Vin Pin Supply Current
IBST_SD
EN = 0, BST = 5 V, SWN = 0
Iload = 0
6.0
2.0
Shutdown Current
IVIN_SD
EN1, EN2, LDOEN, LDO2_EN = 0
EN1, EN2, LDOEN = 5 V,
LDO2_EN = 5 V
5.0
1.15
EN1, EN2 = 0, LDOEN = 5 V,
LDO2_EN = 2.5 V
1.57
EN1, EN2 = 0, LDOEN = 5 V,
LDO2_EN = 0
1.11
OSCILLATOR
Oscillator Frequency
Fsw Rset = 1.8 k
270 300 330
Rset = 9.1 k
340 400 460
Rset = 16 k
540 600 660
Oscillator Frequency Accuracy
ERROR AMPLIFIER
±10
Open Loop DC Gain (Note 3)
80
Open Loop Unity Gain Bandwidth (Note 3)
Open Loop Phase Margin (Note 3)
F0dB,EA
10 15
60
Input Bias Current (Note 3)
−200
200
Input Offset Voltage (Note 3)
V+ = V− = 0.8 V
−1.0 1.0
Slew Rate
COMP pin to GND = 10 pF
2.5
Maximum Output Voltage
Minimum Output Voltage
Output Source Current
Output Sink Current
3. Guaranteed by Design
4. Parameters are for design only, not for product test.
10 mV of overdrive, ISOURCE = 2.0 mA
10 mV of overdrive, ISINK = 2.0 mA
10 mV of overdrive, Vout = 3.5 V
10 mV of overdrive, Vout = 1.0 V
3.3
2.0
2.0
0.3
Units
V
V
mA
V
W
mV
V
V
mA
mA
mA
mA
mA
mA
mA
mA
KHz
KHz
KHz
%
dB
MHz
deg
nA
mV
V/ms
V
V
mA
mA
http://onsemi.com
5
5 Page 
NCP81148
PACKAGE DIMENSIONS
ÇÇÇÇPIN ONE
ÇÇÇÇÇÇÇÇÇÇÇÇREFERENCE
D
0.10 C
0.10 C
0.10 C
TOP VIEW
DETAIL B
QFN28 4x4, 0.4P
CASE 485AR
ISSUE A
AB
LL
L1
E
A
A3
DETAIL A
ALTERNATE TERMINAL
CONSTRUCTIONS
ÉÉÉÉEXPOSED Cu
MOLD CMPD
DETAIL B
ALTERNATE
CONSTRUCTION
NOTES:
1. DIMENSIONING AND TOLERANCING PER ASME
Y14.5M, 1994.
2. CONTROLLING DIMENSION: MILLIMETERS.
3. DIMENSION b APPLIES TO PLATED TERMINAL
AND IS MEASURED BETWEEN 0.15 AND 0.30 MM
FROM THE TERMINAL TIP.
4. COPLANARITY APPLIES TO THE EXPOSED PAD
AS WELL AS THE TERMINALS.
MILLIMETERS
DIM MIN MAX
A 0.80 1.00
A1 0.00 0.05
A3 0.20 REF
b 0.15 0.25
D 4.00 BSC
D2 2.50 2.70
E 4.00 BSC
E2 2.50 2.70
e 0.40 BSC
K 0.30 REF
L 0.30 0.50
L1 −−− 0.15
0.08 C
NOTE 4
SIDE VIEW
DETAIL A
8
28X L
D2
A1
C
SEATING
PLANE
0.10 C A B
K
15 0.10 C A B
E2
PIN 1
INDICATOR
1
e 22
BOTTOM VIEW
28X b
0.07
0.05
CAB
C NOTE 3
RECOMMENDED
MOUNTING FOOTPRINT
4.30
2.71
28X
0.62
1
2.71 4.30
PACKAGE
OUTLINE
0.40
PITCH
28X
0.26
DIMENSIONS: MILLIMETERS
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number of patents, trademarks,
copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. SCILLC
reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any
particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without
limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications
and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC
does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for
surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where
personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and
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any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture
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PUBLICATION ORDERING INFORMATION
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http://onsemi.com
11
ON Semiconductor Website: www.onsemi.com
Order Literature: http://www.onsemi.com/orderlit
For additional information, please contact your local
Sales Representative
NCP81148/D
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet NCP81148.PDF ] | |
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