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3X3MLPQ-16L-TR

型号：

3X3MLPQ-16L-TR

描述：

具有LDO控制器的单输入电源PWM控制器[ SINGLE INPUT SUPPLY PWM CONTROLLER WITH LDO CONTROLLER ]

品牌：

MICROSEMI[ Microsemi ]

页数：

11 页

PDF大小：

389 K

下载PDF手册
LX2750  
SINGLE INPUT SUPPLY PWM CONTROLLER WITH LDO  
CONTROLLER  
PRODUCTION DATA SHEET  
Pb Free Product  
FEATURES  
DESCRIPTION  
n
n
Single Input 12V Bus Voltage  
The LX2750 controller IC is a compact synchronous  
Buck controller IC with 16 lead MLPQ package de-  
signed for step-down DC to DC converter applications.  
Selectable feedforward voltage mode control or con-  
stant on time control provides fast dynamic response.  
Selectable diode emulation mode greatly improves the  
light load efficiency. The LX2750 controller is optimized  
to convert single supply 12V bus voltage to as low as  
0.8V output voltage. An internal regulator converts bus  
voltage to 5V, which provides voltage supply to inter-  
nal logic and driver circuit. The LX2750 employs pro-  
grammable loss-less current limiting by sensing the  
Rdson of synchronous MOSFET followed by hiccup  
feature. Feedback under voltage also triggers hiccup.  
Internal UVLO keeps the controller off until the bus  
supply voltage exceeds 9V where internal digital soft  
starts get initiated to ramp up output. The LX2750 em-  
ploys NMOS LDO controller. Other features include:  
5V gate drive for HDRV signal, 12V gate drive for LDRV  
signal, programmable frequency, adaptive deadband  
control.  
Excellent Dynamic Response with Selectable  
Feedforward Voltage Mode Control or Constant On  
Time Control  
Diode Emulation Mode Available  
Programmable Switching Frequency Up to 2MHz  
Internal Digital Soft Start Function  
Programmable Over Current Protection Triggers  
Hiccup  
NMOS LDO Controller Available  
FB UVLO Followed by Hiccup Feature in Both  
Controllers  
5V High Side Driver and 12 V Low Side Driver  
Pb-free and RoHS Compliant  
n
n
n
n
n
n
n
n
APPLICATIONS  
Graphic Card on Board Converters  
On Board DC to DC such as  
n
n
12V to 3.3V, 2.5V or 1.8V  
Set Top Box and LCD Display  
ASIC Power Supplies  
n
n
TYPICAL APPLICATION  
VIN1  
+12V  
7
15  
VIN  
BST  
14  
13  
10  
HDRV  
VCC  
VOUT1  
+1.8V@8A  
SW  
12  
8
PGOOD  
MODE  
Connected to 5VREG Voltage mode  
Connected to GND Constant on time mode  
11  
2
LDRV  
FB  
Connected to 5VREG synchronous mode  
Connected to GND Diode emulation mode  
9
FCCM  
RT  
16  
1
COMP  
6
5
VREF_OC  
REFIN  
3
4
LDO_DRV  
LDO_FB  
VOUT2  
+1.1V  
GPIO  
17  
GND(PAD)  
Figure1 - Typical application of LX2750  
ORDERING INFORMATION  
Device  
LX2750CLQ  
Temperature  
0 to 70o C  
Package  
3X3 MLPQ-16L  
Frequency  
Pb-Free  
Yes  
200kHz to 2MHz  
Note: Available in Tape & Reel. Append the letters "TR" to the part number. (i.e. LX2750CLQ-TR)  
Rev. 1.0a  
07/14/10  
Microsemi  
Analog Mixed Signal Group  
1
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
LX2750  
ABSOLUTE MAXIMUM RATINGS  
5VREG to GND & BST to SW voltage ................ -0.3V to 6V  
VIN, LDO_DRV to GND ...................................... -0.3V to 16V  
BST,HDRV to GND Voltage .............................. -0.3V to 21V  
SW to GND ....................................................... -2V to 16V  
LDRV to GND .................................................... -0.3V to VIN+0.3V  
All other pins ..................................................... -0.3V to VCC+0.3V  
Storage Temperature Range ............................... -65oC to 150oC  
Operating Junction Temperature Range ...............-40oC to 125oC  
ESD Susceptibility .............................................. 1000V  
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  
3x3 16-LEAD PLASTIC MLPQ  
qJA » 46oC/W  
13  
16 15 14  
PGOOD  
LDRV  
VCC  
1
2
3
4
COMP  
FB  
12  
11  
10  
9
17  
GND  
LDO_DRV  
LDO_FB  
FCCM  
7
5
6
8
ELECTRICAL SPECIFICATIONS  
Unless otherwise specified, these specifications apply over VIN=12V and TA = 0 to 70oC. Typical values refer to  
TA = 25oC.  
PARAMETER  
SYM  
Test Condition  
Min  
TYP  
MAX Units  
REFOUT_OC Voltage  
VREF  
2.45  
-0.3  
2.5  
2.55  
0.3  
V
REFOUT_OC Voltage  
Accuracy  
VIN from 10V to 16V  
%
Supply Voltage(Vin)  
Vin Voltage Range  
Vin  
V
10  
16  
Input Voltage Current(Static)  
Input Voltage Current  
(Dynamic)  
No switching,COMP=0.8V  
Switching with HDRV and  
LDRV open,COMP=1.8V  
7
9
mA  
mA  
Rev. 1.0a  
07/14/10  
Microsemi  
Analog Mixed Signal Group  
2
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
LX2750  
PARAMETER  
VIN UVLO  
SYM  
Test Condition  
Min  
TYP  
MAX Units  
Vin-Threshold  
Vin-Hysteresis  
5V REG  
Vin_UVLO Vin Rising  
9
8
V
V
Vin_Hyst  
Vin Falling  
5VREG Output  
5VREG Max Current  
SS  
No switching  
5.4  
50  
V
mA  
30  
Tss_pwm FS=350kHz,MODE=5V  
5.2  
1.3  
mS  
mS  
Soft Start time  
Tss_con  
FS=350kHz,MODE=0V  
Oscillator (Rt)  
Frequency  
FS  
Rt=110k,MODE=5V  
300  
0.1  
1
kHz  
V/V  
V
245  
359  
Ramp-feedforward gain  
Ramp Offset  
VRAMP  
Max Duty Cycle  
FS=300kHz  
80  
%
Min Off Time  
560  
200  
0.3  
nS  
nS  
V
Min Controlable On Time  
Rt Disable threshold  
Error Amplifiers  
Open Loop Gain (Note1)  
80  
dB  
Gain Bandwidth (Note1)  
Input Bias Current  
10  
1
MHz  
nA  
Ib  
100  
Max Sourcing Current  
FB=0.7V, comp>=3V  
FB=0.9V,comp<=0.3V  
3
mA  
Max Sinking Current  
0.4  
mA  
COMP High Voltage  
COMP Low Voltage  
SW zero cross comparator  
Offset voltage  
FB=0.7V, source 80uA  
FB=0.9V, sink 40uA  
4.4  
0.1  
V
V
-2  
mV  
High Side Driver  
OutpNut Impedance , Sourcing  
Current (Note1)  
Output Impedance , Sinking  
Current (Note1)  
Rsource(Hdrv) BST to SW=5V,  
I=200mA  
Rsink(Hdrv) BST to SW=5V,  
I=200mA  
1
ohm  
ohm  
0.8  
Low Side Driver  
Output Impedance, Sourcing  
Current (Note1)  
Rsource(Ldrv) PVCC=12V  
Rsink(Ldrv) PVCC=12V  
6
2
ohm  
ohm  
Output Impedance, Sinking  
Current (Note1)  
MODE,FCCM threshold  
High Threshold  
Low Threshold  
2
V
V
0.8  
Internal Schottky Diode  
Forward voltage drop  
Power Good  
Forward current=20mA  
450  
mV  
Threshold Voltage as % of Vref  
FB ramping up  
85  
5
%
%
Hysteresis  
FBUVLO  
Feedback UVLO threshold  
percent of nominal  
60  
%
Rev. 1.0a  
07/14/10  
Microsemi  
Analog Mixed Signal Group  
3
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
LX2750  
PARAMETER  
LDO Controller  
SYM  
Test Condition  
Min  
TYP  
MAX Units  
Open Loop Gain(Note1)  
Gain Bandwidth(Note1)  
FB Pin- Bias Current  
100  
dB  
2
1
MHz  
nA  
100  
0.8  
V
LDO FB Voltage  
LDO FB UVLO  
0.772  
0.828  
percent of nominal  
%
60  
High Output Voltage  
Low Output Voltage  
Max Sourcing Current  
Min Sinking Current  
VIN=12V,LDOFB=0.7V,  
source 1.4mA  
LDOFB=0.9V,sink  
1.4mA  
LDOFB=0.7V,  
LDODRV>8V  
LDOFB=0.9V,  
LDODRV<1V  
11.5  
V
V
0.4  
2
mA  
mA  
8
Note1: Design Guaranteed.  
Note  
Rev. 1.0a  
07/14/10  
Microsemi  
Analog Mixed Signal Group  
4
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
LX2750  
PIN DESCRIPTIONS  
PIN SYMBOL  
PIN DESCRIPTION  
This pin is internal 5V regulator output and supplies the internal 5V bias circuit. A high  
freq 1uF ceramic capacitor is recommended to connect this pin to ground.  
VCC  
This pin supplies voltage to high side FET driver. A high freq minimum 0.1uF ceramic  
capacitor is placed as close as possible to and connected to this pin and SW pin.  
BST  
GND  
Ground pin.  
This pin is the error amplifiers inverting input. This pin is connected via resistor divider to  
the output of the switching regulator to set the output DC voltage.  
FB  
This pin is the output of the error amplifier and together with FB pin is used to compensate  
the voltage control feedback loop.  
COMP  
SW  
This pin is connected to source of high side FETs and provide return path for the high  
side driver.  
HDRV  
LDRV  
VIN  
High side gate driver output.  
Low side gate driver output.  
Voltage supply for the internal 5V regulator, LDO controller and low side driver.  
Oscillator's frequency can be set by using an external resistor from this pin to GND.  
Pulling this pin down below 0.3V shuts down both controllers.  
RT  
LDO controller feedback input. This pin is connected via resistor divider to the output of  
the LDO to set the output DC voltage.  
LDO_FB  
LDO_DRV  
LDO controller output. This pin is controlling the gate of an external NCH MOSFET. The  
maximum rating of this pin is 16V.  
Connecting this pin to 5VREG voltage control mode will be chosen.  
Connecting this pin to ground, constant on time control mode will be chosen.  
MODE  
FCCM  
Connecting this pin to 5VREG, synchronous mode will be chosen.  
Connecting this pin to ground, diode emulation mode will be chosen, LDRV will be off  
when inductor current becomes negative current.  
Reference input voltage for error amplifier.  
REFIN  
2.5V external reference. OCP trigger level is set by connect resistor from this pin to  
ground.  
VREF_OC  
PGOOD indicator for switching regulator. It requires a pull up resistor to Vcc or lower  
voltage. When FB pin reaches 85% of the reference voltage PGOOD transitions from LO  
PGOOD  
to HI state.  
Rev. 1.0a  
07/14/10  
Microsemi  
Analog Mixed Signal Group  
5
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
LX2750  
BLOCK DIAGRAM  
PGOOD  
PGOOD  
FB  
Bias  
Generator  
VCC  
VIN  
POR  
1.25V  
0.8V  
BST  
START  
9/8  
RT  
START  
LDO  
Reset dominant  
Hiccup  
HDRV  
SW  
0.3V  
Internal RT  
START  
CLK  
RT  
OSC  
FET Drivers  
IFF  
HDin  
Digital  
start Up  
PWM/PFM control core  
comp  
LDRV  
VIN  
REFIN  
FB  
SS_half_done  
60%*Vp  
FB  
POR  
Dis_EA  
START  
Hiccup  
COMP  
9k  
R
Latchout logic  
VOLTAGE MODE  
VREF_OC  
MODE SELECTION  
MODE SELECTION  
MODE  
FCCM  
CONSTANT ON TIME  
SYNCHRONOUS MODE  
DIODE EMULATION MODE  
SS_done  
60%*0.8V  
LDOPOR  
SS_DAC  
VIN UVLO  
LDO  
amplifier  
LDO_DRV  
LDO_FB  
LDOPOR  
GND  
Figure 2 - Simplified block diagram of the LX2750  
Rev. 1.0a  
07/14/10  
Microsemi  
Analog Mixed Signal Group  
6
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
LX2750  
TP2  
SD  
L2  
BUS  
VBUS1  
C1  
BUS  
short  
R16  
1k  
C18  
220u,16v  
R32  
0
R31  
op  
C4  
OP  
Q1  
D2  
16SEPC270  
MMBT3904  
5VCC  
R17  
1k  
op  
C3  
C6  
0.47u,16V  
R18  
10uF,16V  
JVOUT  
1
0
0
TP1  
COMP  
HDRV  
R3  
R5  
2.6k  
M1  
NTD60N02R  
R8  
H11  
H12  
95.3k  
C26  
0.1u  
R15  
10k  
C21  
0.1u  
R27  
0
0
R6 op  
C14 op  
R10 op  
U1  
M2  
R9  
C11  
1.8n  
R7  
8k  
D1  
op  
TP3  
PGOOD  
op  
SW  
R14 16k  
C13  
120p  
op  
0
L1  
PGOOD  
SW  
M6  
SW VOUT  
SWVOUT  
12  
11  
10  
9
PGOOD  
LDrv  
C12  
4.7n  
1
2
3
4
COMP  
FB  
TP4  
RL-8250-4-1R0M  
R1  
5VCC  
100k  
5VCC  
0
5VCC  
FCCM  
LDPDrv  
LDOFB  
C8  
1200p  
R19  
L11  
L12  
C5  
1u  
C7  
C10  
C27  
22u  
R20  
op  
0
M5 NTD70N03R  
22u  
2R5SEPC820M  
R24  
LDRV  
R21  
LX2750_MLPQ16  
R2  
2.15  
30k  
GND  
op  
op  
R11  
R13  
jumper3/200  
JP1  
jumper3/200  
JP2  
C29  
1n  
J1  
jp  
1
68.1k  
R22  
C22  
1n  
R12  
C25  
1n  
0
C23  
1n  
C24  
32.4k  
2
2
32k  
0.1u  
LDO IN  
R23  
8k  
LDOIN  
op  
R29  
op  
R28  
M4  
NTD60N02R  
C28  
10uF,X5R,6.3V)  
0
4
M3  
op  
MOD=VCC PWM  
0
MOD=GND constant on time control  
LDO OUT  
LDOOUT  
C9  
2X(22uF,X5R,6.3V)  
JVOUT1  
VBUS1  
1
5VCC  
5VCC  
R26  
op  
R33  
40.2k  
C30  
0.1u  
0
M11  
op  
M12  
op  
R30  
op  
R34  
20k  
4
4
H11  
H12  
M8  
GPIO0  
GPIO1  
JP4  
M7  
op  
2N7002  
R36  
op  
R35  
20k  
SW  
JP3  
op  
jumper2/100  
M13  
op  
M14  
op  
4
4
L11  
L12  
0
Figure 3 - Demo board schematic  
Rev. 1.0a  
07/14/10  
Microsemi  
Analog Mixed Signal Group  
7
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
LX2750  
Bill of Materials  
Item  
1
2
3
4
5
6
7
8
Quantity  
Reference  
Part  
16SEPC270  
10uF,16V  
1
1
1
1
1
1
2
2
1
1
1
1
4
4
1
1
2
1
1
1
1
1
1
1
2
5
1
1
1
1
1
2
1
1
1
2
1
C1  
C3  
C5  
C6  
C7  
C8  
C9  
C10,C27  
C11  
C12  
C13  
C18  
1u  
0.47u,16V  
2R5SEPC820M  
1200p  
22uF,X5R,6.3V  
22uF,X5R,6.3V  
1.8n  
4.7n  
120p  
220u,16V  
0.1u  
1n  
10uF,X5R,6.3V  
RL-8250-4-1R0M  
NTD60N02R  
NTD70N03R  
2N7002  
MMBT3904  
100k  
2.15  
95.3k  
2.6k  
8k  
0
68.1k  
32.4k  
1
16k  
10k  
1k  
30k  
32k  
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
C21,C24,C26,C30  
C22,C23,C25,C29  
C28  
L1  
M1,M4  
M6  
M8  
Q1  
R1  
R2  
R3  
R5  
R7,R23  
R8,R18,R19,R27,R32  
R11  
R12  
R13  
R14  
R15  
R16,R17  
R21  
R22  
R33  
40.2k  
20k  
LX2750_MLPQ16  
R34,R35  
U1  
Rev. 1.0a  
07/14/10  
Microsemi  
8
Analog Mixed Signal Group  
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
LX2750  
Demoboard waveforms  
Fig.4 Startup when MODE=5V (CH1 SW 5V/DIV,  
CH2 SW VOUT 1V/DIV)  
Fig.5 Use RT pin to turn on and off (CH1 LDO  
VOUT 1V/DIV, CH2 SW VOUT 1V/DIV, CH3  
SIGNAL on TP2 5V/DIV)  
Fig.7 SW output short(CH1 SW 10V/DIV, CH2 SW  
VOUT 1V/DIV, CH4 INDUCTOR CURRENT 10A/  
DIV)  
Fig.6 SW VOUT ripple when MODE=5V (CH1 SW  
VOUT RIPPLE 50mV/DIV, CH3 SW 10V/DIV, CH4  
INDUCTOR CURRENT 5A/DIV)  
Fig. 8 SW dynamic response when  
Fig. 9 SW dynamic response when  
MODE=5V,FCCM=5V(CH1 SW VOUT AC 50mV/  
DIV, CH4 INDUCTOR CURRENT 5A/DIV)  
MODE=0V,FCCM=5V(CH1 SW VOUT AC 50mV/  
DIV, CH4 INDUCTOR CURRENT 5A/DIV)  
Rev. 1.0a  
07/14/10  
Microsemi  
9
Analog Mixed Signal Group  
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
LX2750  
Demoboard waveforms(Cont')  
Fig. 10 SW dynamic response when  
MODE=0V,FCCM=0V, load from 3mA to 10A(CH1  
SW VOUT AC 20mV/DIV, CH4 INDUCTOR  
CURRENT 5A/DIV)  
Fig. 11 SW dynamic response when  
MODE=5V,FCCM=0V, load from 8mA to 10A(CH1  
SW VOUT AC 50mV/DIV, CH4 INDUCTOR CUR-  
RENT 5A/DIV)  
Fig. 12 LDO dynamic response when LDO load  
from 0.1A to 1A (CH1 LDODRV 1V/DIV, CH2 LDO  
VOUT AC 100mV/DIV, CH4 OUTPUT CURRENT  
Fig. 13 Line transient when MODE=5V(CH1 VIN  
5V/DIV, CH4 SW VOUT AC 50mV/DIV)  
1A/DIV)  
90%  
80%  
70%  
60%  
50%  
40%  
30%  
90%  
80%  
70%  
60%  
50%  
40%  
FCCM=HIGH  
30%  
FCCM=LOW  
FCCM=HIGH  
FCCM=LOW  
20%  
10%  
0%  
20%  
10%  
0%  
100  
1000  
10000  
10  
100  
1000  
10000  
OUTPUT CURRENT(mA)  
OUTPUT CURRENT(mA)  
Fig. 14 Efficiency when MODE=5V  
Fig. 15 Efficiency when MODE=0V  
Rev. 1.0a  
07/14/10  
Microsemi  
Analog Mixed Signal Group  
10  
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
LX2750  
MLPQ 16 PIN 3 x 3 PACKAGE OUTLINE DIMENSIONS  
SYMBOL  
Dimensions In Millimeters  
Dimensions In Inches  
NAME  
A
A1  
A3  
B
D
D2  
E
MIN  
0.700  
0.000  
MAX  
0.800  
0.050  
MIN  
0.028  
0.000  
MAX  
0.031  
0.002  
0.203REF  
0.008REF  
0.180  
2.950  
1.600  
2.950  
1.600  
0.300  
3.050  
1.750  
3.050  
1.750  
0.007  
0.116  
0.063  
0.116  
0.063  
0.012  
0.120  
0.069  
0.120  
0.069  
E2  
e
L
0.50BSC  
1.5REF  
0.50BSC  
0.325  
0.450  
0.013  
0.018  
M
0.059REF  
Rev. 1.0a  
07/14/10  
Microsemi  
Analog Mixed Signal Group  
11  
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570  
厂商 型号 描述 页数 下载

AGERE

 		3X38FTR 八路FET （快速以太网收发器），用于10BASE-T / 100BASE-TX / FX[ OCTAL-FET (Fast Ethernet Transceiver) for 10Base-T/100Base-TX/FX ] 64 页

MICROSEMI

 		3X3MLPQ-16 具有LDO控制器的单输入电源PWM控制器[ SINGLE INPUT SUPPLY PWM CONTROLLER WITH LDO CONTROLLER ] 11 页

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