NX2116 Datasheet, PDF (1/14 Pages) Microsemi Corporation – SYNCHRONOUS PWM CONTROLLER WITH CURRENT LIMIT, POWER GOOD & OVER VOLTAGE

NX2116/2116A/2116B/2117/2117A
SYNCHRONOUS PWM CONTROLLER WITH
CURRENT LIMIT, POWER GOOD & OVER VOLTAGE
PRELIMINARY DATA SHEET
Pb Free Product
DESCRIPTION
FEATURES
The NX2116/2117 family of products are synchronous
Buck controller IC designed for step down DC to DC
converter applications. They are optimized to convert
n
n
n
Bus voltage operation from 2V to 25V
Power Good indicator available in NX2116
Fixed 300kHz, 600kHz and 1MHz for NX2116 and
bus voltages from 2V to 25V to as low as 0.8V output
voltage. The NX2116 and 2117 offer an Enable pin that
can be used to program the converter's start up voltage
using an external divider from bus voltage. These prod-
ucts operate at fixed internal frequency of 300kHz, ex-
n
n
n
n
300kHz, 600kHz for NX2117 family.
Internal Digital Soft Start Function
Less than 50 nS adaptive deadband
Enable pin to program BUS UVLO for NX2116/2117
Programmable current limit triggers latch out by
cept that NX2116A operates at 600kHz and 2116B at ^{sensing Rdson of}
1MHz frequency. These products employ loss-less cur-
rent limiting protection by sensing the Rdson of syn-
n
Synchronous MOSFET
No negative spike at Vout during startup and
chronous MOSFET followed by latch out feature. Feed-
back under voltage triggers Hiccup.
Other features are; 5V gate drive, Power good indica-
tor, Adaptive deadband control, Internal digital soft start;
Vcc undervoltage lock out and shutdown capability via
n
n
n
shutdown
APPLICATIONS
Graphic Card on board converters
Memory Vddq Supply
On board DC to DC such as 2V to 3.3V, 2.5V or
the enable pin or comp pin.
1.8V
n ADSL Modem
TYPICAL APPLICATION
Vin1
L2 1uH
+12V
Vin2
+5V
OFF R8 10k ^2N3904
ON
R7
10k
C3
39uF
R3
10
C4
R5
1uF
4
68k
Vcc
R6
12.4k
C1
33pF
6
EN
8 _Comp
C2
1.5nF
R4 ^{7 Fb}
17.4k
11 _Gnd
C5
1uF
D1
MBR0530T1
1
BST
C7
0.1uF
Hdrv ²
SW ¹⁰
OCP ⁹
Ldrv ³
R11 3.7k
Pgood ⁵
+5V
R10 1k
M1
L1 1uH
M2
Cin
270uF,18mohm
Vout
+1.8V,9A
Co
2x (220uF,12mohm)
Device
NX2116CMTR
NX2116ACMTR
NX2116BCMTR
NX2117CUTR
NX2117ACUTR
Rev. 3.0
03/14/06
R2
R1 20k
16k
R9 C8
2.61k 1nF
Figure 1 - Typical application of 2116
ORDERING INFORMATION
Temperature
0 to 70^oC
0 to 70^o C
0 to 70^o C
0 to 70^o C
0 to 70^o C
Package
MLPD-10L
MLPD-10L
MLPD-10L
MSOP-10L
MSOP-10L
Frequency
300kHz
600kHz
1MHz
300kHz
600kHz
Pb-Free
Yes
Yes
Yes
Yes
Yes
1