NX2715 Datasheet, PDF (1/21 Pages) Microsemi Corporation – SINGLE CHANNEL MOBILE PWM CONTROLLER WITH NMOS LDO CONTROLLER, PGOOD INDICATOR AND ENABLE

NX2715
SINGLE CHANNEL MOBILE PWM CONTROLLER WITH NMOS
LDO CONTROLLER, PGOOD INDICATOR AND ENABLE
ADVANCE DATA SHEET
Pb Free Product
DESCRIPTION
The NX2715 controller IC is a compact synchronous
Buck controller IC with 16 lead MLPQ package de-
signed for step down DC to DC converter applica-
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tions with feedforward functionality. Voltage
feedforward provides fast response, good line regula-
tion and nearly constant power stage gain under wide
voltage input range. The NX2715 controller is optimized
to convert single supply up to 24V bus voltage to as
low as 0.8V output voltage. Internal UVLO keeps the
controller off until the bus supply voltage exceeds 7V
where internal digital soft starts get initiated to ramp
up output. The NX2715 employs NMOS LDO control-
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ler, programmable current limiting and FB UVLO fol-
lowed by latchout feature. Other features include: 5V n
gate drive, programmable frequency, over voltage pro- n
tection, adaptive deadband control and Vcc under volt- n
age lockout.
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FEATURES
Bus voltage operation from 7V to 24V
Less than 1uA shutdown current with Enable low
Excellent dynamic response with input voltage
feed-forward and voltage mode control
Programmable switching frequency
Internal digital soft start function
Programmable current limit triggers latch out
FB UVLO followed by latch out feature
NMOS LDO controller available
Power Good indicator 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
1uF ^{8 VIN}
VIN3
+5V
13 _PVCC
1uF
10
1uF
14 _VCC
9 _EN
4 _RT
100k _{5 PGOOD}
(PAD) _AGND
MBR0530T1
VIN1
+7V to 20V
33uF(25V POSCAP)
BST ¹⁶
0.1uF
HDRV ¹
SW ¹⁵
6k
OCP ¹⁰
Q1
1.5uH
3.9nF
LDRV ³
PGND ²
FB ¹¹
COMP ¹²
Q2
2.49k _18nF
6.98k
1k
12.4k
VOUT1
+1.25V@10A
2*2R5TPE330MC
1nF
LDO OUT ⁶
LDO FB ⁷
2.7nF 2.7k
1k
4.22k
MTD3055
22uF ceramic
VOUT2
+1V@2A
Device
NX2715CMTR
Figure1 - Typical application of NX2715
ORDERING INFORMATION
Temperature
0 to 70^o C
Package
MLPQ -16L
Frequency
200kHz to 1MHz
Pb-Free
Yes
Rev. 1.4
1
01/08/08