NCP5222 Datasheet, PDF (1/28 Pages) ON Semiconductor – High Performance Dual-Channel / Two-Phase Synchronous Buck Controller for Notebook Power System

NCP5222
High Performance
Dual-Channel / Two-Phase
Synchronous Buck
Controller for Notebook
Power System
The NCP5222, a fast−transient−response and high−efficiency
dual−channel / two−phase buck controller with built−in gate drivers,
provides multifunctional power solutions for notebook power system.
180° interleaved operation between the two channels / phases has a
capability of reducing cost of the common input capacitors and
improving noise immunity. The interleaved operation also can reduce
cost of the output capacitors with the two−phase configuration. Input
supply voltage feedforward control is employed to deal with wide
input voltage range. On−line programmable and automatic
power−saving control ensures high efficiency over entire load range.
Fast transient response reduces requirement on the output filters. In the
dual−channel operation mode, the two output power rails are regulated
individually. In the two−phase operation mode, the two output power
rails are connected together by an external switch and current−sharing
control is enabled to balance power delivery between phases.
Features
• Wide Input Voltage Range: 4.5 V to 27 V
• Adjustable Output Voltage Range: 0.8 V to 3.3 V
• Option for Dual−Channel and Two−Phase Modes
• Fixed Nominal Switching Frequency: 300 kHz
• 180° Interleaved Operation Between the Two Channels in
Continue−Conduction−Mode (CCM)
• Adaptive Power Control
• Input Supply Voltage Feedforward Control
• Transient−Response−Enhancement (TRE) Control
• Resistive or Inductor’s DCR Current Sensing
• 0.8% Internal 0.8 V Reference
• Internal 1 ms Soft−Start
• Output Discharge Operation
• Built−in Adaptive Gate Drivers
• Input Supplies Undervoltage Lockout (UVLO)
• Output Overvoltage and Undervoltage Protections
• Accurate Over Current Protection
• Thermal Shutdown Protection
• QFN−28 Package
• This is a Pb−Free Device
Typical Applications
• CPU Chipsets Power Supplies
• Notebook Applications
http://onsemi.com
MARKING
DIAGRAM
1
QFN28
CASE 485AR
N5222
ALYWG
G
A
= Assembly Location
L
= Wafer Lot
Y
= Year
W
= Work Week
G
= Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
7654321
8 ^CS2−/
Vo2
9 _CS2+
10 ^EN2/
SKIP2
11 BST2
12 DH2
13 SWN2
14 DL2
NCP5222
AGND
29
CS1−/ ₂₈
Vo1
CS1+ 27
EN1/ ₂₆
S KIP1
BST1 ²⁵
DH1 ²⁴
SWN1 23
DL1 22
15 16 17 18 19 20 21
(Top View)
ORDERING INFORMATION
Device
Package
Shipping^†
NCP5222MNR2G QFN28
(Pb−Free)
4000 /
Tape & Reel
†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.
© Semiconductor Components Industries, LLC, 2010
1
February, 2010 − Rev. 0
Publication Order Number:
NCP5222/D