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NX4110

型号：

NX4110

描述：

1A同步降压切换器，带FET的ON BOARD[ 1A SYNCHRONOUS BUCK SWITCHER WITH FET ON BOARD ]

品牌：

MICROSEMI[ Microsemi ]

页数：

14 页

PDF大小：

822 K

下载PDF手册
NX4110  
1A SYNCHRONOUS BUCK SWITCHER WITH FET ON BOARD  
PRODUCTION DATA SHEET  
Pb Free Product  
FEATURES  
DESCRIPTION  
n
n
n
n
SOT23-5L package  
Internal Digital Soft Start  
The NX4110 is a current mode PWM buck switcher with  
internal compensation, can provide up to 1A output cur-  
rent with FET on board. It operates from 2.8V to 5.5V  
and output as low as 0.6V which is ideal for the applica-  
tion with single cell Li-Ion battery as well as other 3.3V  
input bus supply applications. Switching frequency is  
fixed 1MHz, small surface mount inductors and capaci-  
tors are allowed to use, make it good for portable appli-  
cations.  
Internally-compensated Current mode controller  
Peak Current Limit with HICCUP Feature and Over  
Temperature Protection  
n
n
n
Prebias Start-up Operation  
PgoodAvailable  
Pb-free and RoHS compliant  
APPLICATIONS  
Li-Ion battery operated portable system  
Cellular Phones  
NX4110 is available in 5-pin SOT23 package.  
n
n
n
n
Portable applications  
USB Devices  
TYPICAL APPLICATION  
VIN=5V  
22uF(X5R,6.3V)  
4
5
VIN  
FB  
2.2uH  
3
2
Vout=2.5V  
SW  
10uF  
(X5R, 6.3V)  
1
PGOOD  
GND  
332k  
105k  
Fig.1 - Typical application of NX4110CZ1TR  
ORDERING INFORMATION  
Device  
NX4110CZ1TR  
Temperature  
-40oC to 85oC  
Package  
SOT23-5L  
Pb-Free  
Yes  
Rev. 2.0  
12/30/09  
Microsemi  
1
Analog Mixed Signal Group  
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4110  
ABSOLUTE MAXIMUM RATINGS  
VIN to GND ..................................................................... -0.3V to 6V  
SW,FB,PGOOD to GND .................................................. -0.3V to VIN + 0.3V  
ESD Susceptibility ............................................................. 1kV  
Lead Temperature(Soldering,10sec.) .................................... 300oC  
Storage Temperature Range ................................................ -55oC to 150oC  
Operating Junction Temperature Range ................................ -40oC to 150oC  
CAUTION: 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  
5-LEAD PLASTIC SOT23  
qJA » 110oC/W  
FB  
PGOOD  
GND  
1
2
3
5
4
VIN  
SW  
ELECTRICAL SPECIFICATIONS  
VIN=3.5V. Typical data refers to TA= 25oC. Unless otherwise specified.  
PARAMETER  
Reference Voltage  
Ref Voltage  
SYM  
Test Condition  
Min  
TYP  
0.6  
2
MAX Units  
VFB  
V
0.59  
0.607  
Line Regualtion  
Line Regulation  
VIN=3V to 5V,VOUT=1.8V,  
IOUT=10mA  
mV  
VIN UVLO  
VIN Rising Threshold  
VIN Falling Threshold  
Supply Voltage(VIN)  
VIN Input Voltage Range  
2.3  
2.8  
2.5  
2.3  
2.8  
5.5  
V
V
VIN  
Iq  
V
No Load, switching  
4
mA  
Quiescent Current  
Oscillator (Rt)  
Frequency  
FS  
1000  
86  
kHz  
%
800  
78  
1200  
Max Duty Cycle  
Min ON time  
100  
nS  
Error Amplifiers  
Feedback Input Bias Current  
SS  
0.05  
uA  
uS  
Soft Start time  
Tss  
500  
Rev. 2.0  
12/30/09  
Microsemi  
Analog Mixed Signal Group  
2
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4110  
PARAMETER  
Current Limit  
SYM  
Test Condition  
Min  
TYP  
MAX Units  
Current Limit Threshold  
Thermal Shutdown  
Thermal shutdown trip point  
Hysteresis  
1.8  
A
oC  
oC  
155  
15  
Internal Switch  
Rdson of Control FET  
Vin=5V  
Vin=3.3V  
Vin=5V  
400  
480  
300  
360  
mohm  
mohm  
Rdson of Synchronous FET  
Vin=3.3V  
PGOOD  
PGOOD low Threshold  
85  
90  
%VREF  
%VREF  
PGOOD high Threshold  
voltage  
PIN DESCRIPTIONS  
PIN SYMBOL  
PIN DESCRIPTION  
SW output. Junction of the internal high-side and low-side power MOSFETs, and  
output inductor.  
SW  
GND  
FB  
Ground Connection for Chip. Connect GND with large copper areas to the input and  
output supply returns, and negative terminals of the input and output capacitors.  
Error amplifier inverting input. Error amplifier inverting input. This pin is connected via  
resistor dividers to the output of the switching regulators to set the output DC voltage. A  
332kohm resistor is recommended to be connected from VOUT and FB .  
Supply voltage input for switcher. This pin needs minimum 22uF/X5R/6.3V as input  
capacitor.  
VIN  
PGOOD indicator. It requires a pull up resistor to Vcc or lower voltage. When FB pin  
reaches 90% of the reference voltage PGOOD transitions from LO to HI state.  
PGOOD  
Rev. 2.0  
12/30/09  
Microsemi  
Analog Mixed Signal Group  
3
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4110  
BLOCK DIAGRAM  
Thermal  
Shutdown  
Bias  
Generator  
Vref  
UVLO  
POR  
3 cycle  
counter  
POR  
VIN  
+
-
OCPB  
CLK  
VIN  
start  
S
R
one shot  
OSC  
Q
Hiccup  
timer  
Soft start  
Vref  
PWM  
OCPB  
FB  
PWM comparator  
Control  
Logic  
SW  
POR  
VIN  
PGOOD  
SS_finished  
FB  
0.9*Vref  
GND  
Fig. 2 - Simplified block diagram of the NX4110  
Rev. 2.0  
12/30/09  
Microsemi  
Analog Mixed Signal Group  
4
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4110  
Typical Operating Characteristics  
R e ference voltage vs tem p e rature  
0 . 604  
0 . 603  
0 . 602  
0 . 601  
0 .6  
0 . 599  
0 . 598  
0 . 597  
0 . 596  
0 . 595  
0 . 594  
0 . 593  
0
2 0  
4 0  
6 0  
8 0  
1 0 0  
1 2 0  
1 4 0  
1 6 0  
temperature(°C )  
Fig.3 - Reference volateg vs temperature  
Normalized frequency vs temperature  
1
0.98  
0.96  
0.94  
0.92  
0.9  
0
20  
40  
60  
80  
100  
120  
140  
160  
temperature(°C)  
Fig.4 - Normalized frequency vs temperature  
Rev. 2.0  
12/30/09  
Microsemi  
Analog Mixed Signal Group  
5
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4110  
D u ty C y c l e v s M a x i m u m O u tp u t C u r r e n t  
1 2 0 0  
1 0 0 0  
8 0 0  
6 0 0  
4 0 0  
2 0 0  
0
0
2 0  
4 0  
6 0  
8 0  
D u ty c y c l e ( % )  
Fig.5 - Duty cycle vs maximum output current  
Rev. 2.0  
12/30/09  
Microsemi  
Analog Mixed Signal Group  
6
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4110  
Typical Application( VOUT=2.5V)  
VIN=5V  
22uF(X5R,6.3V)  
4
5
VIN  
FB  
2.2uH  
3
2
Vout=2.5V  
SW  
10uF  
(X5R, 6.3V)  
1
PGOOD  
GND  
332k  
105k  
Fig. 6 - Demo board schematic  
Fig. 7 - Output ripple  
Fig. 8 - Transient response  
Rev. 2.0  
12/30/09  
Microsemi  
Analog Mixed Signal Group  
7
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4110  
Typical Application( VOUT=1.8V)  
VIN=5V  
22uF(X5R,6.3V)  
4
5
VIN  
FB  
2.2uH  
3
2
Vout=1.8V  
SW  
10uF  
(X5R, 6.3V)  
1
PGOOD  
GND  
332k  
165k  
Fig. 9 - Demo board schematic  
Fig. 10 - Output ripple  
Fig. 11 - Transient response  
Fig. 12 - Efficiency  
Rev. 2.0  
12/30/09  
Microsemi  
Analog Mixed Signal Group  
8
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4110  
Typical Application( VOUT=1.2V)  
VIN=5V  
22uF(X5R,6.3V)  
4
5
VIN  
FB  
2.2uH  
3
2
Vout=1.2V  
SW  
10uF  
(X5R, 6.3V)  
1
PGOOD  
GND  
332k  
332k  
Fig. 13 - Demo board schematic  
Fig. 14 - Output ripple  
Fig. 15 - Transient response  
Fig. 16 - Startup  
Fig. 17 - Shutdown  
Rev. 2.0  
12/30/09  
Microsemi  
Analog Mixed Signal Group  
9
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4110  
Typical Application( VOUT=1.2V)  
Fig. 18 - Efficiency  
Rev. 2.0  
12/30/09  
Microsemi  
Analog Mixed Signal Group  
10  
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4110  
Demoboard Layout  
Fig. 19 - Demoboard schematic  
Fig. 20- Top layer  
Rev. 2.0  
12/30/09  
Microsemi  
Analog Mixed Signal Group  
11  
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4110  
Fig. 21 - Gound layer  
Fig. 22 - Power layer  
Rev. 2.0  
12/30/09  
Microsemi  
Analog Mixed Signal Group  
12  
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4110  
Fig. 23 - Bottom layer  
Rev. 2.0  
12/30/09  
Microsemi  
Analog Mixed Signal Group  
13  
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4110  
SOT23 5 PIN PACKAGE OUTLINE DIMENSIONS  
Top View  
Side View  
Rev. 2.0  
12/30/09  
Microsemi  
Analog Mixed Signal Group  
14  
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
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