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NX4108

型号：

NX4108

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：

12 页

PDF大小：

819 K

下载PDF手册
NX4108  
1A SYNCHRONOUS BUCK SWITCHER WITH FET ON BOARD  
PRODUCTION DATA SHEET  
Pb Free Product  
FEATURES  
DESCRIPTION  
n
n
n
n
n
SOT23-5L package  
Internal Digital Soft Start  
The NX4108 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  
<1uA Shut-down Current  
Peak Current Limit with HICCUP Feature and Over  
Temperature Protection  
n
n
n
Prebias Start-up Operation  
EnableAvailable  
Pb-free and RoHS Compliant  
NX4108 is available in 5-pin SOT23 package.  
APPLICATIONS  
n
n
n
n
Li-Ion Battery Operated Portable System  
Cellular Phones  
PortableApplications  
USB Devices  
TYPICAL APPLICATION  
VIN=5V  
22uF(X5R,6.3V)  
1
5
4
EN  
FB  
VIN  
2.2uH  
3
2
Vout=2.5V  
10uF  
(X5R,6.3V)  
SW  
GND  
332k  
105k  
Figure1 - Typical application of NX4108CZ1TR  
ORDERING INFORMATION  
Device  
NX4108CZ1TR  
Temperature  
-40oC to 85oC  
Package  
SOT23-5L  
Pb-Free  
Yes  
Rev. 1.7  
12/30/09  
Microsemi  
1
Analog Mixed Signal Group  
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4108  
ABSOLUTE MAXIMUM RATINGS  
VIN to GND ..................................................................... -0.3V to 6V  
SW,FB,EN 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  
EN  
GND  
SW  
1
2
3
5
4
VIN  
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  
V
V
VIN  
Ishutdown  
Iq  
V
5.5  
2.5  
EN=GND  
1
4
uA  
mA  
Shutdown Current  
No Load, switching  
Quiescent Current  
Oscillator (Rt)  
Frequency  
FS  
1000  
90  
kHz  
%
800  
78  
1200  
0.05  
Max Duty Cycle  
Min ON time  
100  
nS  
Error Amplifiers  
Feedback Input Bias Current  
SS  
uA  
uS  
Soft Start time  
Tss  
500  
Rev. 1.7  
12/30/09  
Microsemi  
Analog Mixed Signal Group  
2
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4108  
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  
Enable  
En low Threshold voltage  
En high Threshold voltage  
0.4  
V
V
1.4  
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.  
VIN  
EN  
Enable input. Set this pin to GND or less than 0.4V will shut down the regulator.  
Enable signal can not be high when VIN is low.  
Rev. 1.7  
12/30/09  
Microsemi  
Analog Mixed Signal Group  
3
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4108  
BLOCK DIAGRAM  
Thermal  
Shutdown  
Bias  
Generator  
Vref  
UVLO  
POR  
EN  
3 cycle  
counter  
POR  
VIN  
+
-
OCPB  
CLK  
VIN  
reset dom  
start  
70ns  
one shot  
S
OSC  
Q
Hiccup  
timer  
R
Soft start  
Vref  
PWM  
FB  
PWM comparator  
Control  
Logic  
OCPB  
POR  
1Mohm  
SW  
20pF  
VIN  
LDen  
GND  
Figure 2 - Simplified block diagram of the NX4108  
Rev. 1.7  
12/30/09  
Microsemi  
Analog Mixed Signal Group  
4
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4108  
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. 1.7  
12/30/09  
Microsemi  
Analog Mixed Signal Group  
5
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4108  
Typical Application( VOUT=2.5V)  
VIN=5V  
22uF(X5R,6.3V)  
1
4
EN  
VIN  
2.2uH  
10uF  
5
3
2
FB  
Vout=2.5V  
SW  
(X5R,6.3V)  
GND  
332k  
105k  
Figure 5 - Demo board schematic  
Figure 6 - Output ripple  
Figure 7 - Transient response  
Figure 8 - Efficiency  
Rev. 1.7  
12/30/09  
Microsemi  
Analog Mixed Signal Group  
6
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4108  
Typical Application( VOUT=1.8V)  
VIN=5V  
22uF(X5R,6.3V)  
1
4
EN  
VIN  
2.2uH  
10uF  
5
3
2
FB  
Vout=1.8V  
SW  
(X5R,6.3V)  
GND  
332k  
165k  
Figure 9 - Demo board schematic  
Figure 10 - Output ripple  
Figure 11 - Transient response  
Figure12 - Efficiency  
Rev. 1.7  
12/30/09  
Microsemi  
Analog Mixed Signal Group  
7
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4108  
Typical Application( VOUT=1.2V)  
VIN=5V  
22uF(X5R,6.3V)  
2.2uH  
1
4
EN  
VIN  
5
3
2
FB  
Vout=1.2V  
SW  
10uF  
(X5R,  
6.3V)  
GND  
332k  
332k  
Figure 13 - Demo board schematic  
Figure 14 - Output ripple  
Figure 15 - Transient response  
Figure 17 - Shutdown  
Figure 16 - Startup  
Rev. 1.7  
12/30/09  
Microsemi  
Analog Mixed Signal Group  
8
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4108  
Typical Application( VOUT=1.2V)  
Figure 18 - Efficiency  
Rev. 1.7  
12/30/09  
Microsemi  
Analog Mixed Signal Group  
9
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4108  
Demoboard Layout  
U1  
L1  
VIN  
VOUT  
1
4
3
5
1
2
VIN  
VOUT  
GND  
VIN  
SW  
DO1608C-222  
C1  
22u  
C2  
10u  
N X 4 1 0 8  
R1  
FB  
332k  
1
EN  
R2  
105k  
Figure 19 - Demoboard schematic  
Figure 20- Top layer  
Rev. 1.7  
12/30/09  
Microsemi  
Analog Mixed Signal Group  
10  
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4108  
Figure 21- Gound layer  
Figure 22- Power layer  
Rev. 1.7  
12/30/09  
Microsemi  
Analog Mixed Signal Group  
11  
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4108  
Figure 22- Bottom layer  
Rev. 1.7  
12/30/09  
Microsemi  
Analog Mixed Signal Group  
12  
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
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