NCP3120 Datasheet, PDF (1/39 Pages) ON Semiconductor – Dual 2.0 A, Step-Down DC/DC Switching Regulator

NCP3120
Dual 2.0 A, Step-Down
DC/DC Switching Regulator
The NCP3120 is a dual buck converter designed for low voltage
applications requiring high efficiency. This device is capable of
producing an output voltage as low as 0.8 V. The NCP3120 provides
dual 2.0 A switching regulators with an adjustable 200 kHz - 750 kHz
switching frequency. The switching frequency is set by an external
resistor. The NCP3120 also incorporates an auto-tracking and
sequencing feature. Protection features include cycle-by-cycle
current limit and undervoltage lockout (UVLO). The NCP3120 comes
in a 32-pin QFN package.
Features
•ăInput Voltage Range from 4.5 V to 13.2 V
•ă12 V_in to 5.0 V_out = 87% Efficiency Min @ 2.0 A
•ă200-750 kHz Operation
•ăStable with Low ESR Ceramic Output Capacitor
•ă0.8 ±1.5% FB Reference Voltage
•ăExternal Soft-Start
•ăOut of Phase Operation of OUT1 & OUT2
•ăAuto-Tracking and Sequencing
•ăEnable/Disable Capability
•ăHiccup Overload Protection
•ăLow Shutdown Power (I_q < 100 mA)
http://onsemi.com
1 32
QFN32
CASE 488AM
MARKING DIAGRAM
1
NCP3120
AWLYYWWG
G
NCP3120 = Specific Device Code
A
= Assembly Location
WL
= Wafer Lot
YY
= Year
WW
= Work Week
G
= Pb-Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 38 of this data sheet.
Typical Applications
•ăSet-Top Boxes, Portable Applications, Networking and
Telecommunications
•ăDSP/mP/FPGA Core
VIN
RVIN
R_TRACK
PG1
PG2
Enable
EN1
Disable
Enable
Disable
EN2
R14
R24
C3
GND
PG1
PG2
EN1
SEQ1
EN2
SEQ2
TRACK1,2
NCP3120
RT
C22
R23
SW1
VIN
SW2
C12
R13
L11
D11
GND
C1
GND
L21
D21
GND
C2
GND
OUT1
R11
C11
R12
GND
GND
OUT2
R21
C21
GND
R22
GND
GND
C23 _GND
C13
GND
GND
Figure 1. Typical Application Circuit
©Ă Semiconductor Components Industries, LLC, 2008
1
January, 2008 - Rev. 0
Publication Order Number:
NCP3120/D