Evaluation board available.
NX2114/2114A
300kHz & 600kHz SYNCHRONOUS PWM CONTROLLER
PRELIMINARY DATA SHEET
Pb Free Product
DESCRIPTION
FEATURES
The NX2114 controller IC is a synchronous Buck con- n Synchronous Controller in 8 Pin Package troller IC designed for step down DC to DC converter n Bus voltage operation from 2V to 25V applications. Synchronous control operation replaces n Single 5V Supply Operation the traditional catch diode with an Nch MOSFET result- n Short protection with feedback UVLO ing in improved converter efficiency.Although the NX2114 n Internal 300kHz for 2114 and 600kHz for 2114A controller is optimized to convert single 5V bus voltages n Internal Digital Soft Start Function to supplies as low as 0.8V output voltage, however us- n Shut Down via pulling comp pin low ing a few external components it can also be used for n Pb-free and RoHS compliant
other input supplies such as 12V input (See NX2113 data sheet for more optimized solution). The NX2114 operates at 300kHz while 2114A is set at 600kHz n operation which together with less than 50 nS of dead n band provides an efficient and cost effective solution. n Other features of the device are: Internal digital soft start; Vcc undervoltage lock out; Out- n put undervoltage protection with digital filter and shut- n down capability via the enable pin.
APPLICATIONS
Graphic Card on board converters Memory Vddq Supply in mother board applications On board DC to DC such as 5V to 3.3V, 2.5V or 1.8V Hard Disk Drive Set Top Box
TYPICAL APPLICATION
L2 1uH
Vin
+5V C4
47uF,70mohm
R5 10 D1 MBR0530T1
OFF R6 10k
ON R7 10k
C8 47uF,70mohm
2N3904 C1 47pF
C6 1uF
5
Vcc
7 Comp
C2 1.5nF
R4 22.1k
6
Fb
NX2114
1
BST Hdrv 2
SW 8
Ldrv 4
C7 0.1uF
Gnd
3
C5 1uF M1 L1 1.5uH
M2
Cin 220uF,12mohm
Vout +1.6V,6A
Co 2 x (220uF,15mohm)
R2 10.2k
R1 10.2k R3 C3 1.5k 2.2nF
Device NX2114CSTR NX2114ACSTR
Figure1 - Typical application of 2114
ORDERING INFORMATION
Temperature 0 to 70oC 0 to 70o C
Package SOIC-8L SOIC-8L
Frequency 300kHz 600kHz
Pb-Free Yes Yes
Rev. 4.0 06/20/06
1
NX2114/2114A
ABSOLUTE MAXIMUM RATINGS(NOTE1)
Vcc to GND & BST to SW voltage ................... 6.5V BST to GND Voltage ...................................... 35V Storage Temperature Range ............................. -65oC to 150oC Operating Junction Temperature Range ............. -40oC to 125oC
NOTE1: Stresses above those listed in "ABSOLUTE MAXIMUM RATINGS", may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
PACKAGE INFORMATION
8-PIN PLASTIC SOIC (S)
θJA ≈ 130o C/W
BST 1 HDrv 2 Gnd 3 LDrv 4
8 SW 7 Comp 6 Fb 5 Vcc
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over Vcc = 5V, and T = 0 to 70oC. Typical values refer to T AA
= 25oC. Low duty cycle pulse testing is used which keeps junction and case temperatures equal to the ambient temperature.
PARAMETER Reference Voltage Ref Voltage Ref Voltage line regulation Supply Voltage(Vcc) VCC Voltage Range VCC Supply Current (Static) VCC Supply Current (Dynamic)
Supply Voltage(VBST) VBST Supply Current (Static) VBST Supply Current (Dynamic)
Under Voltage Lockout VCC-Threshold VCC-Hysteresis
SYM
Test Condition
VREF 4.5V