NX2710 Datasheet, PDF (1/23 Pages) Microsemi Corporation – SINGLE CHANNEL PWM CONTROLLER WITH NMOS LDO CONTROLLER AND 5V BIAS REGULATOR

NX2710
SINGLE CHANNEL PWM CONTROLLER WITH NMOS LDO
CONTROLLER AND 5V BIAS REGULATOR
ADVANCE DATA SHEET
Pb Free Product
DESCRIPTION
The NX2710 controller IC is a compact synchronous
Buck controller IC with 16 lead SOIC package designed
for step down DC to DC converter applications with
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feedforward functionality. Voltage feedforward provides
fast response, good line regulation and nearly constant
power stage gain under wide voltage input range. The
NX2710 controller is optimized to convert single sup-
ply up to 24V bus voltage to as low as 0.8V output
voltage. Internal UVLO keeps the regulator off until the
supply voltage exceeds 9V where internal digital soft
starts get initiated to ramp up output. The NX2710 em-
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ploys programmable current limiting and FB UVLO
followed by HICCUP feature. Other features include: n
5V gate drive, Programmable frequency from 300kHz n
to 1MHz, Adaptive deadband control, Internal digital n
soft start; Vcc under voltage lockout and shutdown ca-
pability via comp pin.
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FEATURES
Bus voltage operation from 9V to 24V
5V bias regulator available
Excellent dynamic response with input voltage
feed-forward and voltage mode control
Programmable switching frequency up to 1MHz
Internal Digital Soft Start Function
Programmable hiccup current limit
Shutdown by pulling COMP pin low
NMOS LDO controller available
Start into precharged output
Pb-free and RoHS compliant
APPLICATIONS
Notebook PC
Graphic Card on board converters
On board DC to DC such as
12V to 3.3V, 2.5V or 1.8V
Set Top Box and LCD Display
TYPICAL APPLICATION
1ohm
1uF ^{8 VIN}
9 _REGCS
+5V
10uF
5k
1.65k
10
REGOUT
13 _VCC
1uF
11
REGFB
5 _RT
DO3316P-102
MBR0530T1
2*16SVP330M
BST ¹
0.1uF
HDRV ²
SW ¹⁶
OCP ¹²
LDRV ⁴
GND ³
Fb ¹⁴
Comp ¹⁵
8.06k
2.5k
Q1
0.75uH
3.3nF
Q2
7.5k
1.2k
15nF
15k
680pF
VIN1
+12V
VOUT1
+1.2V@25A
2*(560uF,7mohm)
VIN2
+3.3V
LDO OUT ⁶
LDO FB ⁷
82pF
5k
MTD3055
5k
150uF
18mohm
VOUT2
+1.6V@2A
Device
NX2710CSTR
Figure1 - Typical application of NX2710
ORDERING INFORMATION
Temperature
0 to 70^o C
Package
SOIC -16L
Frequency
300kHz to 1MHz
Pb-Free
Yes
Rev. 1.3
1
08/07/07