NCP81147MNTXG [ONSEMI]

Precise Low Voltage Synchronous Buck Controller;
NCP81147MNTXG
型号: NCP81147MNTXG
厂家: ONSEMI    ONSEMI
描述:

Precise Low Voltage Synchronous Buck Controller

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中文:  中文翻译
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NCP81147  
Precise Low Voltage  
Synchronous Buck  
Controller with Power  
Saving Mode  
www.onsemi.com  
The NCP81147 is a simple single phase solution with differential  
phase current sensing, power saving operation, and gate drivers to  
provide accurately regulated power.  
MARKING  
DIAGRAMS  
The adaptive non overlap gate drive and power saving operation  
circuit provide a low switching loss and high efficiency solution for  
server, notebook, and desktop systems. A high performance  
operational error amplifier is provided to simplify compensation of the  
system. The NCP81147 features also include soft−start sequence,  
accurate overvoltage and over current protection, UVLO for VCC and  
VCCP, and thermal shutdown.  
81147  
ALYWG  
G
QFN16  
CASE 485G  
1
81147 = Specific Device Code  
A
L
Y
W
G
= Assembly Location  
= Wafer Lot  
Features  
= Year  
High Performance Operational Error Amplifier  
Internal Soft−Start/Stop  
= Work Week  
= Pb−Free Package  
0.5% Internal Voltage Accuracy, 0.8 V voltage reference  
(Note: Microdot may be in either location)  
OCP accuracy, Four Re−entry Times Before Latch  
“Lossless” Differential Inductor Current Sensing  
Internal High Precision Current Sensing Amplifier  
Oscillator Frequency Range of 100 kHz − 1000 kHz  
20 ns Adaptive FET Non−overlap Time of Internal Gate Driver  
5.0 V to 12 V Operation  
PIN CONNECTIONS  
16  
15  
14  
13  
Support 1.5 V to 19 V V  
in  
V from 0.8 V to 3.3 V (5 V with 12 V  
)
CC  
1
2
3
4
12  
11  
10  
9
out  
VCCP  
LG  
CSN/VO  
FBG  
Chip Enable through OSC pin  
Latched Over Voltage Protection (OVP)  
Internally Fixed OCP Threshold  
LX  
VSEN  
FB  
Guaranteed Startup Into Pre−Charged Loads  
Thermally Compensated Current Monitoring  
Thermal Shutdown Protection  
BOOT  
5
6
7
8
Integrated MOSFET Drivers  
Integrated BOOST Diode with internal R = 2.2 W  
bst  
Automatic Power Saving Mode to Maximize Efficiency During Light  
(Top View)  
Load Operation  
Sync Function  
Remote Ground Sensing  
This is a Pb−Free Device*  
ORDERING INFORMATION  
Device  
Package  
Shipping  
NCP81147MNTXG  
QFN16 3000 / Tape & Reel  
(Pb−Free)  
Applications  
Desktop and Server Systems  
*For additional information on our Pb−Free strategy and soldering details, please  
download the ON Semiconductor Soldering and Mounting Techniques  
Reference Manual, SOLDERRM/D.  
†For information on tape and reel specifications,  
including part orientation and tape sizes, please  
refer to our Tape and Reel Packaging Specification  
Brochure, BRD8011/D.  
© Semiconductor Components Industries, LLC, 2014  
1
Publication Order Number:  
August, 2016 − Rev. 1  
NCP81147/D  
NCP81147  
6
15  
2.2 W  
BOOT  
UG  
4
5
Over Current  
Detector  
CSP  
13  
12  
CDIFF  
+
Current Sense  
Amplifier  
CSN/VO  
LX  
3
OSC  
UVP  
OVP  
+
Control Logic,  
Protection,  
RAMP  
Generator and  
PWM Logic  
COMP  
FBG  
8
VREF*75%  
11  
+
UVLO  
Control  
0.8V  
Error Amplifier  
VCCP  
LG  
1
2
FB  
9
+
VREF*125%  
VREF*50%  
OVP,  
UNLATCHED  
+
10  
14  
VSEN  
1.24V  
ROSC/EN  
Programmable  
OSC  
SYNC  
GND  
7
16  
Figure 1. NCP81147 BLOCK DIAGRAM  
PIN DESCRIPTIONS  
Pin No.  
Symbol  
VCCP  
LG  
Description  
Power supply for bottom gate MOSFET drivers  
Bottom gate MOSFET driver pin  
1
2
3
4
5
6
LX  
Switch node  
BOOT  
UG  
Supply rail for the floating top gate driver  
Top gate MOSFET driver pin  
PGOOD  
Power Good. It is an open−drain output, set free after SS (with 3x clock delay) as long as the output  
voltage monitored through VSEN is within specifications.  
7
SYNC  
Synchronization Pin. The controller synchronizes on the falling edge of a square wave provided to  
this pin. Short to GND if not used.  
8
COMP  
FB  
Output of the error amplifier  
9
Inverting input to the error amplifier  
10  
11  
12  
13  
14  
15  
16  
VSEN  
FBG  
Output Voltage Sense  
Remote Ground Sense  
CSN/VO  
CSP  
Inductor differential sense inverting input  
Inductor differential sense non−inverting input  
Programs the switching frequency; EN: Pull−low to disable the device  
Supply rail for the controller internal circuitry  
Ground reference  
ROSC/EN  
VCC  
GND  
THERMAL PAD  
Connects with the silicon substrate for good thermal contact with the PCB. Connect to GND plane.  
www.onsemi.com  
2
NCP81147  
VCC  
VCCP  
VIN  
PGOOD  
SYNC  
Q3  
1
6
7
1
4
RSEN1  
RS1  
CSEN1  
PGOOD  
SYNC  
VCCP  
BOOT  
RS2  
RNTC1  
13  
12  
CBOOT1  
CSP  
NCP81147  
CSN/VO  
LOUT1  
5
3
2
VOUT  
UG  
LX  
11  
9
FBG  
FB  
RFB2  
CFB2  
Q4  
1
8
COMP  
COUT1  
+
RF1  
CF1  
CH1  
LG  
RFB3  
RVFB1  
ENABLE  
JP3  
2
1
ETCH  
R2  
R1  
Figure 2. Typical Application Circuit  
ABSOLUTE MAXIMUM RATINGS  
Rating  
Symbol  
VCC, VCCP  
BOOT  
V
V
Unit  
V
MAX  
MIN  
Controller Power Supply Voltages to GND  
Boost Supply Voltage Input  
15  
−0.3  
−0.3  
35V wrt/GND  
40 V <100 ns  
wrt/GND  
V
15 wrt/LX  
High−Side Driver Output  
(Top Gate)  
UG  
35  
−0.3 wrt/LX  
−5 V < 200 ns  
V
40 V 50 ns  
wrt/GND  
15 wrt/LX  
Switching Node  
(Bootstrap Supply Return)  
LX  
LG  
35  
−5  
V
V
40 < 100 ns  
−10 V < 200 ns  
Low−Side Driver Output  
(Bottom Gate)  
15  
−0.3  
−5 V < 200 ns  
All Other Pins  
PGOOD  
6
7
−0.3, −1 V < 1 ms  
−0.3, −1 V < 1 ms  
−0.3, −1 V < 1 ms  
−0.3, −1 V < 1 ms  
V
V
V
V
PGOOD  
SYNC  
SYNC  
7
Current Sense Amplifier  
CSP, CSN/VO with  
10  
V
CC  
= 12 V  
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality  
should not be assumed, damage may occur and reliability may be affected.  
*All signals referenced to GND unless noted otherwise.  
www.onsemi.com  
3
NCP81147  
THERMAL INFORMATION  
Rating  
Symbol  
Typ  
60  
Unit  
°C/W  
°C/W  
°C  
Thermal Resistance, Junction−to−Ambient  
Thermal Resistance, Junction−to−Case  
Operating Junction Temperature Range  
Operating Ambient Temperature Range  
Maximum Storage Temperature Range  
R
q
JA  
JC  
J
R
18  
q
T
T
−40 to +125  
−40 to +85  
−55 to +150  
1
°C  
A
T
STG  
°C  
Moisture Sensitivity Level  
QFN Package  
MSL  
ELECTRICAL CHARACTERISTICS Unless otherwise stated: −40°C < T < 85°C; 4.5 V < VCC < 13.2 V; C  
= 0.1 mF  
A
VCC  
Parameter  
SUPPLY OPERATING CONDITIONS  
VCC Voltage Range  
Test Conditions  
Min  
Typ  
Max  
Unit  
4.5  
4.5  
13.2  
13.2  
10  
V
VCCP Voltage Range  
V
dV/dt on VCC (Note 1)  
−10  
−10  
V/ms  
V/ms  
dV/dt on VCCP (Note 1)  
10  
VCC AND BOOT INPUT SUPPLY CURRENT  
VCC Operating Current  
V
= 5 V, EN = High  
= 12 V, EN = High  
5.0  
mA  
uA  
CC  
V
CC  
VCC Supply Current  
V
= 5 V, EN = Low  
= 12 V, EN = Low  
400  
CC  
CC  
V
VCCP INPUT SUPPLY CURRENT  
VCCP Operating Current  
UG and LG Open  
V
= 5 V, EN = High  
= 12 V, EN = High  
mA  
CCP  
V
CCP  
3.5  
5.0  
VCCP Supply Current  
V
V
= 5 V, EN = Low  
= 12 V, EN = Low  
200  
mA  
CCP  
CCP  
VCC SUPPLY VOLTAGE  
VCC UVLO Start Threshold  
VCC UVLO Hysteresis  
V
Rising  
4.50  
4.2  
V
CC  
V
CC  
Rising or Falling  
300  
200  
mV  
VCCP SUPPLY VOLTAGE  
VCCP UVLO Start Threshold  
VCCP UVLO Hysteresis  
ERROR AMPLIFIER COMP  
Open Loop DC Gain (Note 1)  
Open Loop Unity Gain Bandwidth (Note 1)  
Slew Rate (Note 1)  
V
mV  
120  
18  
dB  
15  
MHz  
V/ms  
COMP pin to GND with 100 pF load  
8.0  
VREF  
Internal Reference Voltage  
Output Voltage Accuracy  
0.800  
V
V
out  
to FBG excluding external resistor divider  
tolerance  
−1.5  
1.5  
%
CURRENT SENSE AMPLIFIERS  
Common Mode Input Voltage Range  
(Note 1, GNG, output within 10mV)  
V
V
7.5 V  
−0.3  
−0.3  
3.5  
5.5  
V
V
CC  
Common Mode Input Voltage Range  
(Note 1, GNG, output within 10 mV)  
> 7.5 V  
CC  
1. Guaranteed by design.  
2. For propagation delays, ”tpdh” refers to the specified signal going high ”tpdl” refers to it going low. Reference Gate Timing Diagram.  
www.onsemi.com  
4
NCP81147  
ELECTRICAL CHARACTERISTICS Unless otherwise stated: −40°C < T < 85°C; 4.5 V < VCC < 13.2 V; C  
= 0.1 mF  
A
VCC  
Parameter  
Test Conditions  
Min  
Typ  
Max  
Unit  
OSCILLATOR (with no ROSC Resistor Defaults to 200 kHz)  
Switching Frequency Accuracy  
R
open  
−15  
15  
%
OSC  
OSC Gain (Note 1)  
10  
kHz /  
mA  
Disable threshold  
R
/EN pin, V  
0.75  
V
OSC  
dis_th  
MODULATORS (PWM Comparators)  
Minimum Pulse Width  
F
F
= 200 kHz, OSC open  
= 200 kHz, OSC open  
90  
ns  
ns  
V
sw  
Minimum Turn Off Time (LG on)  
Magnitude of the PWM Ramp  
Maximum Duty Cycle  
250  
350  
1.50  
450  
95  
sw  
V
IN  
= 5 V or 12 V  
OSC/EN = OPEN  
80  
30  
%
Minimum Skip mode frequency  
In light load, maximum time for LG to turn on  
after HG turns off  
kHz  
SOFT−START  
Soft Start Time @ 200 kHz  
SOFT−OFF  
1024 clock cycles, OSC/EN open  
5.12  
120  
ms  
Soft OFF bleeding resistor  
OVER CURRENT PROTECTION  
First Over Current Threshold  
Second Over Current Threshold  
SYNC PIN  
R
W
dis  
CSP−CSN, 4xMasking  
17  
20  
30  
23  
mV  
mV  
CSP−CSN, Immediate action  
Synchronization Input  
VIL, square wave  
VIH, square wave  
1.0  
V
V
Synchronization Input  
2.5  
PROTECTION AND PGOOD  
Output Voltage  
Logic Low, Sinking 4 mA  
0.4  
140  
80  
60  
50  
1
V
%
%
%
ms  
ms  
OVP Threshold  
VSEN rising above 1.25 * V  
110  
70  
125  
75  
ref  
UVP Threshold  
VSEN falling below 0.75 * V  
ref  
Unlatched Overvoltage Threshold  
Power Good High Delay (Note 1)  
Power Good Low Delay (Note 1)  
ZERO CURRENT DETECTION (LX Pin)  
V
with respect to 0.5 V  
40  
50  
th_disoff  
ref  
Blanking Time before Zero Current  
Detection (Note 1)  
Blanking Time after LG is < 1.0 V  
40  
20  
ns  
ns  
Capture Time for LX Voltage (Note 1)  
Time to capture LX voltage once LG is < 1.0 V  
(must be within dead time limits)  
Negative LX detection voltage  
Positive LX detection voltage  
V
150  
0.2  
3.0  
300  
0.5  
450  
1.0  
3.7  
mV  
V
bdls  
V
bdhs  
Time for V adjustment and settling time  
300 kHz  
ms  
th  
(Note 1)  
Initial Negative Current Detection  
Threshold Voltage Set Point (Note 1)  
LX−GND, Includes 2 mV Offset Range  
1.0  
0
mV  
mV  
V
th  
adjustable Range (Note 1)  
−16  
15  
1. Guaranteed by design.  
2. For propagation delays, ”tpdh” refers to the specified signal going high ”tpdl” refers to it going low. Reference Gate Timing Diagram.  
www.onsemi.com  
5
NCP81147  
ELECTRICAL CHARACTERISTICS Unless otherwise stated: −40°C < T < 85°C; 4.5 V < VCC < 13.2 V; C  
= 0.1 mF  
A
VCC  
Parameter  
Test Conditions  
Min  
Typ  
Max  
Unit  
HIGH SIDE DRIVER UG  
R
R
Output Resistance, Sourcing  
Output Resistance, Sinking  
Transition Time  
V
BOOT  
− V = 12 V, C  
= 3 nF, V =12 V  
2.5  
2.0  
16  
11  
5
W
W
H_TG  
H_TG  
LX  
load  
CC  
V
BOOT  
− V = 12V, V =12 V  
2.5  
LX  
CC  
Tr  
Tf  
C
C
= 2 nF, V =12 V  
ns  
ns  
ns  
DRVH  
DRVH  
LOAD  
LOAD  
CC  
Transition Time  
= 2 nF, V =12 V  
CC  
Tpdh  
Propagation Delay (Notes 1, 2)  
Driving High, C  
= 3 nF,  
=12 V  
15  
30  
DRVH  
LOAD  
CCP  
V
CC  
= 12 V, V  
UG Internal Resistor to LX  
Unbiased, BOOT − LX = 0  
45  
kW  
LOW SIDE DRIVER LG  
R
R
Output Resistance, Sourcing  
Output Resistance, Sinking  
Transition Time  
V
= GND, C  
= 3 nF, V =12 V  
2.0  
1.0  
16  
11  
3.0  
1.5  
W
W
H_BG  
L_BG  
LX  
load  
CC  
V
LX  
= V , V =12 V  
CC CC  
Tr  
Tf  
C
= 3 nF, V =12 V  
ns  
ns  
ns  
DRVL  
LOAD  
LOAD  
CC  
Transition Time  
C
= 3 nF, V =12 V  
CC  
DRVL  
Tpdh  
Propagation Delay (Notes 1, 2)  
Driving High, C  
= 3 nF, V = 12 V,  
CCP  
10  
20  
35  
DRVL  
LOAD  
V
CCP  
= 12 V  
LX Internal Resistor to GND  
45  
kW  
THERMAL SHUTDOWN  
T
Thermal Shutdown (Note 1)  
150  
180  
50  
°C  
°C  
sd  
T
sdhys  
Thermal Shutdown Hysteresis  
(Note 1)  
1. Guaranteed by design.  
2. For propagation delays, ”tpdh” refers to the specified signal going high ”tpdl” refers to it going low. Reference Gate Timing Diagram.  
www.onsemi.com  
6
 
NCP81147  
1V  
1V  
Figure 3. Gate Timing Diagram  
Switching Frequency  
Connecting a resistor from ROSC/EN to an external  
of an internal ramp signal correspondingly with a fixed  
delay time. The external signal has to sit within a 0-40%  
frequency window above the local frequency configured by  
voltage source V will configure the switching frequency.  
pu  
Normal range would be 100 kHz to 1 MHz. With no resistor  
connected to the pin, the oscillator frequency is 200 kHz.  
The switching frequency will follow the relationship:  
the R  
working properly.  
resistor to allow the synchronization function  
osc  
Power Good  
Vpu * 1.240  
kHz  
The PGOOD pin is an open drain connection with no  
internal pullup resistor. An active high output signals the  
normal operation of the converter. PGOOD is pulled low  
during soft-start cycle, and if there is an overvoltage or  
undervoltage fault. If the voltage on the VSEN pin is within  
10% of Vref (0.8 V) then the PGOOD pin will not be pulled  
low.  
FSW + 200 kHz *  
@ 10  
(eq. 1)  
ROSC  
mA  
When R  
= infinity (no resistor connected), F  
=
osc  
sw  
200 kHz; when V = ground, the frequency programmed  
pu  
will be higher than 200 kHz. Pulling R /EN pin to ground  
osc  
solidly with a less than 10 kW resistor will result in the part  
being disabled.  
Overvoltage Protection (OV)  
Soft−Start  
If the voltage on the VSEN pin exceeds the overvoltage  
threshold (1000 mV or 125% Vref), the NCP81147 will latch  
an overvoltage fault. During an overvoltage fault event the  
UG pin will be pulled low, and the LG pin will stay high until  
the voltage on the VSEN pin goes below 400 mV or 50%  
Soft−Start will begin if VCC, VCCP are both above their  
UVLO thresholds and EN pin is set free. IC initially waits  
a fixed delay time and then ramps the reference in 5.12 ms  
(1024 clock cycles when R  
open) in closed−loop  
osc  
regulation. After soft−start, PGOOD signal will be released  
with 3 clock cycles delay.  
V , then a soft-bleeding resistor will be connected from  
ref  
switch node to ground to continuously discharge the output  
voltage softly. To clear the overvoltage fault, toggling VCC  
or EN is needed.  
Protection active during soft−start:  
Overvoltage Protection always enabled;  
Undervoltage Protection is enabled after reference  
voltage ramps up to 80% of the final value. During  
soft−start, a UVP fault will initiate a complete soft  
restart.  
Undervoltage Protection (UV)  
If the voltage on the FB pin falls below the undervoltage  
threshold after the softstart cycle completes, the NCP81147  
will latch an undervoltage fault. During an undervoltage  
fault, both the UG and LG pins will be pulled low. Toggling  
VCC power or EN will reset the undervoltage protection.  
Synchronization Function  
Synchronize through the SYNC pin. Synchronization  
function allows different converters to share the same input  
filter reducing the resulting RMS current and reducing the  
need for total caps to sustain the load. Synchronized systems  
also exhibit higher EMI noise immunity and better  
regulation.  
The device synchronizes to the Falling edge of the SYNC  
pin external input signal (eg. high side gate signal, switch  
node signal, distribution clock signal), and locks the phase  
PreOVP Protection  
If the NCP81147 is powered on but not enabled, the VSEN  
pin will be monitored for preOVP condition. If the VSEN  
exceeds the preset threshold, the device will force LG pin  
high to protect the load. The PreOVP function will be  
disabled when the device is enabled and the normal OV  
function will operate instead.  
www.onsemi.com  
7
NCP81147  
VPU  
LG  
BUFFER  
VSEN  
VTH  
Figure 4. PreOVP circuit  
Vin Detection  
During the soft start after the VSEN pin exceeds 80% V ,  
UV protection will be enabled; If a UV fault is triggered in  
the softstart, it will restart SS after a fixed delay. The UV  
protection is to avoid IC to startup without Vin or with  
insufficient Vin voltage.  
OCP2 will be tripped, the UG and LG will be pulled low and  
latched immediately. Toggling VCC power or EN will reset  
the Overcurrent protection.  
The current sensing R/C network should be selected to  
match the inductor time constant as below,  
ref  
L
(RCS1ńńRCS2) @ C +  
DCR  
(Notes: the actual RC network time constant may be  
slightly higher)  
Overcurrent Protection  
NCP81147 measures the differential current sensing  
signal through CSP and CSN/VO pin. There are two current  
protection levels: OCP1 and OCP2. If the differential  
voltage across pin CSP and CSN/VO is over 20 mV (but  
below 30 mV) for four consecutive cycles, OCP1 will be  
tripped. Both UG and LG will be forced to low to turn off the  
high side and low side FETs, it is a latched condition; If the  
differential voltage across pin CSP and CSN is over 30 mV,  
Thus, OCP1 and OCP2 levels can be configured as,  
20 mV  
DCR  
RCS1 ) RCS2  
OCP1 +  
OCP2 +  
@
@
RCS2  
30 mV  
DCR  
RCS1 ) RCS2  
RCS2  
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8
NCP81147  
L
DCR  
RS1  
RS2  
CS  
CSP  
CSN/VO  
Figure 5. Differential Current Sense Network  
Light Load Operation  
this way, the ripple variation during transition between the  
discontinuous and continuous current mode can be  
minimized.  
In the light load condition, NCP81147 will work in a diode  
emulation mode with bottom gate turning off if the inductor  
current is below zero. The system therefore works in  
discontinuous conduction mode (DCM). The zero current  
detection is done by sensing switch node and automatically  
adjusted to minimize the low side FET body diode  
conduction time (right after LG turns off) in diode emulation  
mode.  
If the load reduces further, COMP signal will be close or  
below the internal ramp bottom triggering minimum on time  
operation, the system will start skipping pulses, working in  
a reduced frequency range. NCP81147 has an internal  
ultrasonic timer to keep the device from working in an audio  
frequency and below. This timer initiates after high side gate  
off signal and expires after ~30 ms.  
Voltage Feedback  
The NCP81147 allow the output voltage to be adjusted  
from 0.8 V to 5 V via an external resistor divider network  
(R1, R2). The controller will regulate the output voltage to  
maintain the FB pin voltage to 0.8 V reference voltage. The  
relation between the resistor divider network and the output  
voltage is as below;  
0.8 V  
Vout * 0.8 V  
R2 + R1 @ ǒ  
Ǔ
VOUT  
Normally high side gate signal will reset this ultrasonic  
timer repeatedly before it expires. In a very light load or load  
release, if there is no high side gate pulses until the timer  
expires, the low side MOSFET(s) will be forced to turn on  
to discharge the output. Through properly compensated  
network the comp signal will climb up to generate next burst  
of switching pulses and the converter will regulate the  
output voltage to its target level. This can last a few cycles  
or continuously depending on the system load level.  
In light load operation, if synchronization is enabled,  
NCP81147 will also check the SYNC pin input signal cycle  
by cycle. If the external sync signal is within the  
synchronization frequency range, the NCP81147 will  
interleave its switching pulses with it after a proper delay. In  
R1  
R2  
VFB  
Figure 6. Feedback Voltage  
www.onsemi.com  
9
NCP81147  
Vin  
POR_VCC  
UVLO_VCC  
VCC  
1.24V  
0.75V  
OSC/EN  
LG (Stays Low  
until first PWM  
pulse except in  
case of a Fault)  
UG  
OVP  
(125%V  
)
ref  
V
= 0.8 V  
ref  
80% V  
rer  
OCP/  
Normal  
shutdown  
Vout.  
FB  
Vth_disoff  
(50%V  
)
ref  
Softstop  
UV monitor  
SoftStart  
Normal  
1024cycle  
~5ms@200kHzz  
Pre-OVP valid  
Figure 7. Start Up and Shutdown Timing Diagram  
www.onsemi.com  
10  
NCP81147  
PWR  
ON  
EN>Vdis_th  
No  
VCC> POR &  
VCCDR> UVLO_VCCDR (16−  
pin)  
Yes  
PreOVP detection  
BG on  
VSEN>OV Vth  
VCC> POR &  
VCCDR> U_VLO VCCDR  
No  
BOOT >UVLO_BOOT  
Yes  
Fosc detection  
Soft Start ,  
Normal Operation  
OCP, OVP, UVP detection  
UV (after Vout reaches UV  
threshold in softstart)  
OC  
OV  
4 times  
reentry  
UVP  
OVP  
OCP  
TG OFF, BG  
OFF  
PGOOD=0  
TG OFF, BG ON  
PGOOD=0  
After 4 times reentry for  
1st threshod  
or immediately over 2nd  
threshold  
No  
Vout< Vth_disoff  
TG OFF, BG  
Yes  
OFF  
Vo discharge  
mode  
Yes  
OVP  
Vcc<UVLO_Vcc, Or  
EN<Vdis_th Or  
No  
Boot<UVLO_Boot  
No  
Figure 8. State Diagram  
www.onsemi.com  
11  
NCP81147  
PACKAGE DIMENSIONS  
QFN16 3x3, 0.5P  
CASE 485G  
ISSUE F  
NOTES:  
D
A
B
L
L
1. DIMENSIONING AND TOLERANCING PER  
ASME Y14.5M, 1994.  
2. CONTROLLING DIMENSION: MILLIMETERS.  
3. DIMENSION b APPLIES TO PLATED  
TERMINAL AND IS MEASURED BETWEEN  
0.25 AND 0.30 MM FROM TERMINAL.  
4. COPLANARITY APPLIES TO THE EXPOSED  
PAD AS WELL AS THE TERMINALS.  
L1  
PIN 1  
LOCATION  
DETAIL A  
ALTERNATE TERMINAL  
CONSTRUCTIONS  
E
MILLIMETERS  
DIM MIN  
0.80  
A1 0.00  
NOM MAX  
A
0.90  
0.03  
1.00  
0.05  
2X  
A3  
0.10  
C
EXPOSED Cu  
MOLD CMPD  
A3  
b
D
0.20 REF  
0.24  
3.00 BSC  
1.75  
0.18  
0.30  
1.85  
1.85  
2X  
0.10  
C
TOP VIEW  
D2 1.65  
E
3.00 BSC  
1.75  
0.50 BSC  
0.18 TYP  
0.40  
DETAIL B  
A1  
(A3)  
E2 1.65  
e
K
L
0.05  
0.05  
C
DETAIL B  
ALTERNATE  
A
C
0.30  
0.50  
0.15  
CONSTRUCTIONS  
L1 0.00  
0.08  
NOTE 4  
A1  
SEATING  
PLANE  
C
SIDE VIEW  
RECOMMENDED  
SOLDERING FOOTPRINT*  
0.10  
C
A
B
16X  
0.58  
DETAIL A  
D2  
PACKAGE  
OUTLINE  
16X  
L
8
4
1
9
1
2X  
1.84  
2X  
3.30  
E2  
16X  
K
16X  
0.30  
16  
16X b  
e
0.10  
0.05  
C
C
A B  
0.50  
e/2  
BOTTOM VIEW  
PITCH  
NOTE 3  
DIMENSIONS: MILLIMETERS  
*For additional information on our Pb−Free strategy and soldering  
details, please download the ON Semiconductor Soldering and  
Mounting Techniques Reference Manual, SOLDERRM/D.  
ON Semiconductor and  
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coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein.  
ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability  
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PUBLICATION ORDERING INFORMATION  
LITERATURE FULFILLMENT:  
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USA/Canada  
Europe, Middle East and Africa Technical Support:  
Phone: 421 33 790 2910  
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For additional information, please contact your local  
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NCP81147/D  

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