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NX4108-12CZ1TR

型号：

NX4108-12CZ1TR

品牌：

MICROSEMI[ Microsemi ]

页数：

8 页

PDF大小：

286 K

下载PDF手册
NX4108-12  
1A SYNCHRONOUS BUCK SWITCHER WITH FET ON BOARD  
Production Datasheet  
Pb Free Product  
FEATURES  
DESCRIPTION  
n
2.8 to 5.5V Input Voltage  
The NX4108-12 is a current mode PWM buck switcher  
with internal compensation and fixed 1.2V output volt-  
age, can provide up to 1A output current with FET on  
board. It operates from 2.8V to 5.5V which is ideal for  
the application with single cell Li-Ion battery as well as  
other 3.3V input bus supply applications. Switching fre-  
quency is fixed 1MHz, small surface mount inductors  
and capacitors are allowed to use, make it good for por-  
table applications.  
n Fixed 1.2V Output Voltage  
n
n
n
n
5-pin SOT23 Package  
1MHz Fixed Frequency PWM Operation  
Internally-compensated Current Mode Controller  
Peak Current Limit with HICCUP Feature and Over  
Temperature Protection  
n
n
Prebias Start-up Operation  
Pb-free and RoHS Compliant  
NX4108-12 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,10V)  
1
4
EN  
VIN  
5
2.2uH  
3
2
VOUT  
Vout=1.2V  
SW  
10uF  
(X5R,  
6.3V)  
GND  
Figure1 - Typical application of NX4108-12  
ORDERING INFORMATION  
Device  
NX4108-12CZ1TR  
Temperature  
-40oC to 85oC  
Package  
SOT23-5L  
Pb-Free  
Yes  
Rev. 1.1  
06/30/10  
Microsemi  
1
Analog Mixed Signal Group  
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4108-12  
ABSOLUTE MAXIMUM RATINGS  
VIN to GND ..................................................................... -0.3V to 6V  
SW,VOUT,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  
VOUT  
VIN  
EN  
GND  
SW  
1
2
3
5
4
ELECTRICAL SPECIFICATIONS  
VIN=3.5V. Typical data refers to TA= 25oC. Unless otherwise specified.  
PARAMETER  
VOUT Voltage  
SYM  
Test Condition  
Min  
TYP  
1.2  
2
MAX Units  
VOUT Voltage  
VOUT  
1.232  
V
1.168  
Line Regualtion  
Line Regulation  
VIN=3V to 5V,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  
EN=GND  
1
5.0  
uA  
mA  
Shutdown Current  
No Load, switching  
15  
Quiescent Current  
Oscillator (Rt)  
Frequency  
FS  
kHz  
%
900  
1000 1300  
Max Duty Cycle  
Min ON time  
SS  
78  
85  
100  
nS  
Soft Start time  
Tss  
500  
uS  
Rev. 1.1  
06/30/10  
Microsemi  
Analog Mixed Signal Group  
2
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4108-12  
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
2.0  
V
PIN DESCRIPTIONS  
PIN SYMBOL  
PIN DESCRIPTION  
SW output. Junction of the internal high-side and low-side power MOSFETs, and  
output inductor.  
SW  
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.  
GND  
Sense output voltage .  
VOUT  
VIN  
Supply voltage input for switcher.  
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.  
EN  
Rev. 1.1  
06/30/10  
Microsemi  
Analog Mixed Signal Group  
3
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4108-12  
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  
VOUT  
PWM  
PWM comparator  
Control  
Logic  
OCPB  
POR  
1Mohm  
SW  
20pF  
VIN  
LDen  
GND  
Figure 2 - Simplified block diagram of the NX4108-12  
Rev. 1.1  
06/30/10  
Microsemi  
Analog Mixed Signal Group  
4
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4108-12  
Typical Operating Characteristics  
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.3- Normalized frequency vs temperature  
VOUT vs. Temperature  
1.198  
1.196  
1.194  
1.192  
1.190  
1.188  
1.186  
1.184  
1.182  
1.180  
-40  
-20  
0
20  
40  
60  
80  
Temperature(°C)  
Figure 4 - Output voltage vs temperature(VIN=5V, NO LOAD)  
Rev. 1.1  
06/30/10  
Microsemi  
Analog Mixed Signal Group  
5
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4108-12  
Typical Application  
VIN=5V  
22uF(X5R,10V)  
2.2uH  
1
5
4
EN  
FB  
VIN  
3
2
Vout=1.2V  
SW  
22uF  
(X5R,6.3V)  
GND  
Figure 5 - Demo board schematic  
Figure 6 - Efficiency(VIN=5V)  
Rev. 1.1  
06/30/10  
Microsemi  
Analog Mixed Signal Group  
6
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4108-12  
Typical Application Waveforms and Efficiency  
Figure 7 - Output ripple  
Figure 8 - Transient response  
Figure 9 - Startup  
Figure 10 - Shutdown  
Figure 11 - Output Short  
Rev. 1.1  
06/30/10  
Microsemi  
Analog Mixed Signal Group  
7
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
NX4108-12  
SOT23-5 Outline Dimensions  
NOTE:  
1. Dimensions and tolerances are as per ANSI Y14.5M,1982.  
2. Package surface to be matte finish VDI 11~13.  
3. Dimensions are exclusive of mold flash and gate burr.  
Rev. 1.1  
06/30/10  
Microsemi  
Analog Mixed Signal Group  
8
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
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