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  ON Semiconductor Electronic Components Datasheet  

CS5421 Datasheet

Dual Out of Phase Synchronous Buck Controller

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CS5421
Dual Out−of−Phase
Synchronous Buck
Controller with Remote
Sense
The CS5421 is a dual Nchannel synchronous buck regulator
controller. It contains all the circuitry required for two independent
buck regulators and utilizes the V2control method to achieve the
fastest possible transient response and best overall regulation, while
using the least number of external components. The CS5421 features
outofphase synchronization between the channels, reducing the
input filter requirement. The CS5421 also provides undervoltage
lockout, Soft Start, built in adaptive FET nonoverlap and remote
sense capability. The part is available in a 16 Lead SO Narrow package
allowing the designer to minimize solution size.
Features
V2 Control Topology
150 ns Transient Response
Programmable Soft Start
25 ns Gate Rise and Fall Times (with 1.0 nF load)
40 ns Adaptive FET Nonoverlap Time
100% Duty Cycle for Enhanced Transient Response
Internal Slope Compensation
1.0 V 0.8% and 2.0% Error Amplifier References
150 kHz to 750 kHz Programmable Frequency Operation
Switching Frequency Set by Single Resistor
OutOfPhase Synchronization Between the Channels Reduces the
Input Filter Requirement
Undervoltage Lockout
On/Off Control Through Use of the COMP Pins
http://onsemi.com
SO16
D SUFFIX
CASE 751B
PIN CONNECTIONS AND
MARKING DIAGRAM
1
GATE(H)1
GATE(L)1
PGND
LGND
SGND
VFFB1
VFB1
COMP1
16
GATE(H)2
GATE(L)2
PGND2
VCC
ROSC
VFFB2
VFB2
COMP2
A
WL, L
YY, Y
WW, W
= Assembly Location
= Wafer Lot
= Year
= Work Week
ORDERING INFORMATION
Device
CS5421GD16
CS5421GDR16
Package
Shipping
SO16
SO16
48 Units/Rail
2500 Tape & Reel
© Semiconductor Components Industries, LLC, 2006
July, 2006 Rev. 10
1
Publication Order Number:
CS5421/D


  ON Semiconductor Electronic Components Datasheet  

CS5421 Datasheet

Dual Out of Phase Synchronous Buck Controller

No Preview Available !

CS5421
VIN 12 V
VIN 5.0 V
1.0 μH
3 × 1200 μF
VOUT
3.3 V/11 A
1.2 μH
4 × 1200 μF
34.5 k
15 k
1.0 μF
16 GATE(H)2
13
VCC
GATE(H)1 1
15 GATE(L)2
GATE(L)2 2
14 PGND2 CS5421 PGND1 3
11
9
0.1 μF 10
12
VFFB2
COMP2
VFB2
ROSC
30.9 k
LGND
4
VFFB1 6
COMP1 8
SGND
5
VFB1 7
3 × 1200 μF
VOUT
1.5 V/9.0 A
2.7 μH
6 × 1200 μF
0.1 μF
30 k
15 k
GND SENSE
Figure 1. Application Diagram, 5.0 V/12 V to 3.3 V/11 A and 1.5 V/9.0 A Converter
for Processor I/O and Core Supplies
ABSOLUTE MAXIMUM RATINGS*
Rating
Operating Junction Temperature, TJ
Storage Temperature Range, TS
ESD Susceptibility (Human Body Model)
Package Thermal Resistance:
JunctiontoCase, RθJC
JunctiontoAmbient, RθJA
Lead Temperature Soldering:
1. 60 second maximum above 183°C.
*The maximum package power dissipation must be observed.
ABSOLUTE MAXIMUM RATINGS
Pin Symbol
Pin Name
VCC IC Power Input
COMP1, COMP2
VFB1, VFB2
VFB1, VFB2
Compensation Capacitor for
Channel 1 or 2
Voltage Feedback Input for
Channel 1 or 2
Fast Voltage Feedback
Input for Channel 1 or 2
Value
150
65 to +150
2.0
Unit
°C
°C
kV
Reflow: (SMD styles only) (Note 1)
28
115
230 peak
°C/W
°C/W
°C
VMAX
16 V
4.0 V
5.0 V
5.0 V
VMIN
0.3 V
0.3 V
0.3 V
0.3 V
ISOURCE
N/A
1.0 mA
1.0 mA
1.0 mA
ISINK
1.5 A peak
200 mA DC
1.0 mA
1.0 mA
1.0 mA
http://onsemi.com
2


Part Number CS5421
Description Dual Out of Phase Synchronous Buck Controller
Maker ON Semiconductor
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