FAN53763 [ONSEMI]

1.5 A Synchronous Buck Regulator;
FAN53763
型号: FAN53763
厂家: ONSEMI    ONSEMI
描述:

1.5 A Synchronous Buck Regulator

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FAN53763  
1.5 A Synchronous Buck  
Regulator  
Description  
The FAN53763 is a Super Low Iq, step−down switching voltage  
regulator, that delivers a fixed output from an input voltage supply of  
2.3 V to 5.5 V. Using a proprietary architecture with synchronous  
rectification, the FAN53763 is capable of delivering a peak efficiency  
of 93%, while maintaining efficiency over 90% at load currents as low  
as 1 mA.  
www.onsemi.com  
The regulator operates with 0402 and 0603 input and output  
capacitors, respectively, which reduces the total solution size to  
5.5 mm . At moderate and light load, Pulse Frequency Modulation  
WLCSP6  
CASE 567UH  
2
(PFM) is used to operate the device with a low quiescent current. Even  
with such a low quiescent current, the part exhibits excellent transient  
response during load swings. In Shutdown Mode, the supply current  
drops to 100 nA, reducing power consumption. The Mode pin allows  
the part to be in a Super Low IQ (SLIQ) mode with a typical quiescent  
current of 2 mA.  
MARKING DIAGRAM  
12KK  
XYZ  
The FAN53763 is available in 6−bump, 0.4 mm pitch, Wafer−Level  
Chip−Scale Package (WLCSP).  
Features  
12  
KK  
X
Y
Z
= Alphanumeric Device Code  
= Lot Run Code  
= Alphabetical Year Code  
= 2−weeks Date Code  
= Assembly Plant Code  
2 mA Typical Quiescent Current  
2
5.5 mm Total Solution Size  
1.5 A Output Current Capability  
0.6 V to 1.8 V Fixed Output Voltage  
2.3 V to 5.5 V Input Voltage Range  
Best−in−Class Load Transient Response  
Best−in−Class Efficiency with Sub 1 mA Output Currents  
Internal Soft−Start Limits Battery Current Below 150 mA to Avoid  
Brown−out Scenarios  
SW  
L1  
VIN  
VOUT  
1.0μH  
CIN  
2.2μF  
COUT  
22μF  
FAN53763  
Protection Faults (UVLO, OCP and OTP)  
Thermal Shutdown and Overload Protection  
6−Bump WLCSP, 0.4 mm Pitch  
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS  
Compliant  
MODE  
FB  
EN  
GND  
Figure 1. Typical Application  
ORDERING INFORMATION  
Applications  
Wearables  
Smart Watch  
Health Monitoring  
Sensor Drive  
See detailed ordering and shipping information on page 2 of  
this data sheet.  
Energy Harvesting  
Utility and Safety Modules  
RF Modules  
© Semiconductor Components Industries, LLC, 2017  
1
Publication Order Number:  
October, 2017 − Rev. 1  
FAN53763/D  
 
FAN53763  
Table 1. ORDERING INFORMATION  
Output Voltage  
Max. Output  
Temperature  
(Note 1)  
Current (Note 1)  
Range  
Part Number  
Package  
Packing Method  
Device Marking  
FAN53763UC24X  
1.8 V  
1.5 A  
−40 to 85°C  
WLCSP  
Tape & Reel  
GP  
1. Other voltage and output current options are available. Contact an On Semiconductor representative  
Table 2. RECOMMENDED EXTERNAL COMPONENTS  
Component  
Description  
Vendor  
Parameter  
Typ  
1.0  
2.2  
22  
Unit  
L
1.0 mH, 20%, 2.3 A, 107 mW, 1608  
2.2 mF, 20%, 6.3 V, X5R, 0402  
22 mF, 20%, 6.3 V, X5R, 0603  
DFE160810S−1R0M (Murata)  
C1005X5R0J225M050BC (TDK)  
C1608X5R0J226M080AC (TDK)  
L
C
C
mH  
C
IN  
mF  
C
(Note 2)  
OUT  
2. A 10 mF, 0402 capacitor can be used to reduce total solution size at the expense of load transient performance.  
Pin Configuration  
A2  
A1  
B1  
C1  
EN  
MODE  
FB  
VIN  
SW  
VIN  
SW  
EN  
A1  
B1  
C1  
A2  
B2  
C2  
MODE  
FB  
B2  
C2  
GND  
GND  
Figure 2. Top View  
Figure 3. Bottom View  
Table 3. PIN DEFINITIONS  
Pin #  
Name  
EN  
Description  
A1  
Enable. The device is in Shutdown Mode when voltage to this pin is <0.4 V and enabled when >1.2 V.  
Do not leave this pin floating. Recommended for GPIO 1.8 V to drive this pin.  
A2  
B1  
VIN  
Input Voltage. Connect to input power source across C .  
IN  
MODE  
MODE. Logic “LOW” allows the IC to be in a Super Low IQ (SLIQ) state. A Logic HIGH allows the part  
to be in normal Iq state Auto Mode.  
B2  
C1  
C2  
SW  
FB  
Switching Node. Connect to SW pad of inductor.  
Feedback. Connect to positive side of output capacitor.  
Ground. Power and IC ground. All signals are referenced to this pin.  
GND  
Table 4. ABSOLUTE MAXIMUM RATINGS  
Symbol  
Parameter  
Min  
−0.3  
−0.3  
−0.3  
Max  
Unit  
V
V
IN  
Input Voltage  
6.5  
V
SW  
Voltage on SW Pin  
V
V
+0.3 (Note 3)  
+0.3 (Note 3)  
V
IN  
V
CTRL  
EN, FB and Mode Pin Voltage  
Human Body Model per JESD22−A114  
Charged Device Model per JESD22−C101  
Junction Temperature  
V
IN  
ESD  
2.0  
1.0  
kV  
T
J
−40  
−40  
+150  
+150  
+260  
°C  
°C  
°C  
T
STG  
Storage Temperature  
T
L
Lead Soldering Temperature, 10 Seconds  
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.  
3. Lesser of 6 V or V +0.3 V  
IN  
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2
 
FAN53763  
Table 5. RECOMMENDED OPERATING CONDITIONS  
Symbol  
Parameter  
Min  
2.3  
0
Typ  
Max  
5.5  
Unit  
V
V
IN  
Supply Voltage Range  
Output Current  
I
1.5  
A
OUT  
C
Input Capacitor  
2.2  
1.0  
mF  
mF  
mH  
°C  
°C  
IN  
C
(Note 4) Output Capacitor  
3
100  
1.3  
OUT  
L
Inductor  
0.47  
−40  
−40  
T
Operating Ambient Temperature  
Operating Junction Temperature  
+85  
+125  
A
T
J
Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond  
the Recommended Operating Ranges limits may affect device reliability.  
4. Effective capacitance after DC bias.  
Table 6. THERMAL PROPERTIES  
Symbol  
Parameter  
Min  
Typ  
Max  
Unit  
θ
JA  
Junction−to−Ambient Thermal Resistance (Note 5)  
125  
°C/W  
5. Junction−to−ambient thermal resistance is a function of application and board layout. This data is simulated with four−layer 2s2p boards with  
vias in accordance to JESD51− JEDEC standard. Special attention must be paid not to exceed the junction temperature.  
Table 7. ELECTRICAL CHARACTERISTICS Minimum and maximum values are at V = V = 3.6 V, T = −40°C to +85°C,  
IN  
EN  
A
unless otherwise noted. Typical values are at T = 25°C, V = V = 3.6 V, VOUT = 1.8 V.  
A
IN  
EN  
Symbol  
Parameter  
Quiescent Current  
Condition  
Min  
Typ  
Max  
Unit  
mA  
mA  
nA  
V
I
SLIQ Mode, no load, non−switching  
PFM Mode, no load, non−switching  
2
Q,SLIQ  
I
PFM Quiescent Current  
Shutdown Supply Current  
5
Q,PFM  
I
EN=GND, V =3.6 V, no load  
100  
2.15  
2.05  
SD  
IN  
V
V
Under−Voltage Lockout Threshold  
V
Rising  
Falling  
2.10  
2.00  
1.2  
2.21  
2.10  
UVLO_RISE  
UVLO_FALL  
IN  
IN  
V
V
V
IH  
HIGH−Level Input Voltage  
LOW−Level Input Voltage  
Peak Current Limit  
V
0.4  
V
VIL  
I
V
V
V
V
V
=4.35 V, open−loop  
2215  
mA  
mV  
mV  
mW  
mW  
°C  
°C  
LIM  
IN  
V
R
Output Voltage Accuracy  
=0.6V to 1.8V, I  
=0.6V to 1.8V, I  
=0, PWM Mode  
=0, PFM Mode  
−25  
−40  
+25  
+40  
OACC  
OUT  
OUT  
OUT(DC)  
OUT(DC)  
PMOS On Resistance  
NMOS On Resistance  
Thermal Shutdown  
= V = 3.6 V  
135  
95  
DS(on)  
IN  
IN  
GS  
= V = 3.6 V  
GS  
T
TSD  
150  
15  
T
HYS  
Thermal Shutdown Hysteresis  
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product  
performance may not be indicated by the Electrical Characteristics if operated under different conditions.  
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3
 
FAN53763  
Table 8. SYSTEM CHARACTERISTICS Recommended operating conditions, unless otherwise noted, V = 2.3 V to 5.5 V, T =  
IN  
A
−40°C to +85°C, V  
= 1.8 V. Typical values are given at T = 25°C, V = 3.6 V. System characteristics are based on circuit per  
OUT  
A
IN  
Figure 1. L = 1.0 mH, 2.3A, 107 mW DCR, DFE160810S−1R0M (Murata), C = 1x 2.2 mF, 6.3 V, 0402 (1005 metric),  
IN  
C1005X5R0J225M050BC (TDK) and C  
= 1x 22 mF, 6.3 V, 0603 (1608 metric), C1608X5R0J226M080AC (TDK).  
OUT  
Symbol  
Parameter  
Conditions  
Min  
Typ  
−9.0  
−2.0  
−0.5  
Max  
Units  
mV/mA  
mV/A  
LOAD  
Load Regulation  
I
I
= 10 mA to 1 mA, SLIQ Mode  
= 200 mA to 1500 mA, PWM  
REG  
OUT  
OUT  
LINE  
Line Regulation  
Ripple Voltage  
3.0 V V 4.35 V,  
mV/V  
REG  
IN  
I
I
I
I
I
I
I
I
I
I
I
I
= 300 mA, PWM  
OUT  
OUT  
OUT  
OUT  
OUT  
OUT  
OUT  
OUT  
OUT  
OUT  
OUT  
OUT  
V
40  
25  
mV  
%
= 250 mA, SLIQ Mode  
= 20 mA, PFM Mode  
= 200 mA, PWM Mode  
= 100 mA, SLIQ Mode  
= 500 mA, SLIQ Mode  
= 1 mA, PFM Mode  
= 100 mA, PFM Mode  
= 300 mA, PWM Mode  
= 500 mA, PWM Mode  
= 700 mA, PWM Mode  
= 10 mA150 mA,  
OUT_RIPPLE  
5
Eff  
Efficiency  
88  
91  
90  
87  
91  
90  
88  
ΔV  
Load Transient  
Line Transient  
−40/+25  
mV  
mV  
mV  
OUT_LOAD  
T
= T = 1 ms, Auto Mode  
R
F
I
= 100 mA500 mA,  
= T = 1 ms, SLIQ Mode  
15  
20  
OUT  
T
R
F
ΔV  
V
= 3.0 V3.6 V, T = T = 10 ms,  
OUT_LINE  
IN  
R
F
I
= 300 mA, PWM Mode  
OUT  
NOTE: The above system characteristics are guaranteed by design and are not performed in production testing.  
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4
FAN53763  
Typical Characteristics  
Unless otherwise specified, V = 3.6 V, V  
= 1.8 V, Auto Mode, T = 25°C; circuit and components according to Figure 1 and Table 2.  
IN  
OUT  
A
95  
90  
85  
80  
75  
70  
65  
60  
95  
90  
85  
80  
75  
70  
V
IN  
V
IN  
V
IN  
V
IN  
V
IN  
= 2.50 V  
= 3.00 V  
= 3.80 V  
= 4.35 V  
= 5.00 V  
65  
60  
−40°C  
+25°C  
+85°C  
55  
50  
55  
50  
0
0.01  
0.1  
1
0
0.01  
0.1  
1
I
(A)  
I
(A)  
LOAD  
LOAD  
Figure 4. Efficiency vs. Load Current and Input  
Voltage, VOUT = 1.8 V, Auto Mode  
Figure 5. Efficiency vs. Load Current and  
Temperature, VIN = 3.6 V, VOUT = 1.8 V, Auto  
Mode  
95  
90  
85  
80  
75  
70  
65  
60  
95  
90  
85  
80  
75  
70  
65  
60  
V
IN  
V
IN  
V
IN  
V
IN  
V
IN  
= 2.5 V  
= 3.0 V  
= 3.6 V  
= 4.2 V  
= 5.0 V  
−40°C  
+25°C  
+85°C  
55  
50  
55  
50  
0.01  
0.1  
1
0.01  
0.1  
1
LOAD CURRENT (mA)  
LOAD CURRENT (mA)  
Figure 6. Efficiency vs. Load Current and Input  
Voltage, VOUT = 1.8 V, SLIQ Mode  
Figure 7. Efficiency vs. Load Current and  
Temperature, VIN = 3.6 V , VOUT = 1.8 V, SLIQ  
Mode  
2.0%  
1.5%  
1.0%  
0.5%  
0%  
2.0%  
1.5%  
1.0%  
0.5%  
0%  
−40°C  
+25°C  
+85°C  
V
IN  
V
IN  
V
IN  
V
IN  
V
IN  
= 2.50 V  
= 3.00 V  
= 3.80 V  
= 4.35 V  
= 5.00 V  
−0.5%  
−1.0%  
−0.5%  
−1.0%  
−1.5%  
−2.0%  
−1.5%  
−2.0%  
0
0.25  
0.50  
0.75  
(A)  
1.00  
1.25  
1.50  
0
0.25  
0.50  
0.75  
I (A)  
LOAD  
1.00  
1.25  
1.50  
I
LOAD  
Figure 8. Output Regulation vs. Load Current  
and Input Voltage, VOUT = 1.8 V, Auto Mode  
Figure 9. Output Regulation vs. Load Current  
and Temperature, VIN = 3.6 V, VOUT = 1.8 V,  
Auto Mode  
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5
FAN53763  
Typical Characteristics  
Unless otherwise specified, V = 3.6 V, V  
= 1.8 V, Auto Mode, T = 25°C; circuit and components according to Figure 1 and Table 2.  
IN  
OUT  
A
3000  
2500  
2000  
1500  
60  
V
IN  
V
IN  
V
IN  
V
IN  
= 3.00 V  
= 3.80 V  
= 4.35 V  
= 5.00 V  
50  
40  
30  
20  
V
IN  
V
IN  
V
IN  
V
IN  
V
IN  
= 2.50 V  
= 3.00 V  
= 3.80 V  
= 4.35 V  
= 5.00 V  
1000  
500  
0
10  
0
0
0.25  
0.50  
0.75  
(A)  
1.00  
1.25  
1.50  
0
0.25  
0.50  
0.75  
I (A)  
LOAD  
1.00  
1.25  
1.50  
I
LOAD  
Figure 10. Frequency vs. Load Current and  
Input Voltage, Auto Mode, VOUT = 1.8 V, Auto  
Mode  
Figure 11. Output Ripple vs. Load Current and  
Input Voltage, VOUT = 1.8 V, Auto Mode  
8
7
4
3
2
6
5
4
1
0
−40°C  
+25°C  
+85°C  
−40°C  
+25°C  
+85°C  
3
2
2.3  
2.8  
3.3  
3.8  
4.3  
4.8  
5.3  
2.3  
2.8  
3.3  
3.8  
4.3  
4.8  
5.3  
INPUT VOLTAGE (V)  
INPUT VOLTAGE (V)  
Figure 12. Quiescent Current vs. Input Voltage  
and Temperature, VOUT = 1.8 V, Auto Mode  
Figure 13. Quiescent Current vs. Input Voltage  
and Temperature, VOUT = 1.8 V, SLIQ Mode  
0.5  
0.4  
0.3  
0.2  
−40°C  
+25°C  
+85°C  
VOUT(50mV/DIV, AC Coupled)  
0.1  
0
IOUT(100mA/DIV)  
2.3  
2.8  
3.3  
3.8  
4.3  
4.8  
5.3  
INPUT VOLTAGE (V)  
Figure 14. Shutdown Current vs. Input Voltage  
and Temperature  
Figure 15. Load Transient, VIN= 3.6 V, VOUT  
1.8 V, 10 mA 150 mA, 1 ms Edge, Auto Mode  
=
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FAN53763  
Typical Characteristics  
Unless otherwise specified, V = 3.6 V, V  
= 1.8 V, Auto Mode, T = 25°C; circuit and components according to Figure 1 and Table 2.  
IN  
OUT  
A
VOUT(50mV/DIV, AC Coupled)  
IOUT(200mA/DIV)  
Figure 16. Load Transient, VIN = 3.6 V, VOUT  
1.8 V, 5 mA 300 mA, 1 ms Edge, Auto Mode  
=
Figure 17. Load Transient, VIN = 3.6 V, VOUT  
1.8 V, 100 mA 300 mA, 1 ms Edge, Auto  
Mode  
=
VOUT(100mV/DIV, AC Coupled)  
IOUT(1A/DIV)  
Figure 18. Load Transient, VIN = 3.6 V, VOUT  
1.8 V, 10 mA 1500 mA, 1 ms Edge, Auto  
Mode  
=
Figure 19. Line Transient, VIN = 3.0 V 3.6 V,  
V
OUT = 1.8 V, 10 ms Edge, 300 mA Load, Auto  
Mode  
Figure 20. Start−up, VIN = 3.6 V, VOUT = 1.8 V,  
50 mA Resistive Load, Auto Mode  
Figure 21. Start−up, VIN = 3.6 V, VOUT = 1.8 V,  
300 mA Resistive Load, Auto Mode  
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7
FAN53763  
Operation Description  
The FAN53763 is a Super Low Iq (SLIQ), step−down  
switching voltage regulator, typically operating at 2.5 Mhz  
currents from causing damage. The regulator continues to  
limit the current cycle−by−cycle. After 500 ms of current  
limit, the regulator triggers an over−current fault, causing  
the regulator to shut down for about 20ms before attempting  
a restart.  
in Continuous Conduction Mode(CCM). Using  
a
proprietary architecture with synchronous rectification, the  
FAN53763 is capable of delivering a peak efficiency of  
93%, while maintaining efficiency over 90% at load currents  
sub 1 mA.  
In SLIQ mode the device is very efficient with load  
currents in the mA range. In SLIQ mode the device draws  
less than 2 mA typical from the battery with no load. The load  
transients in SLIQ mode are best in class.  
Under−Voltage Lockout (UVLO)  
When EN is HIGH, the under−voltage lockout keeps the  
part from operating until the input supply voltage rises high  
enough to properly operate. This ensures no misbehavior of  
the regulator during startup or shutdown.  
Over−Temperature Protection (OTP)  
The FAN53763 provides a fixed output voltage of 0.6 V  
to 1.8 V and load capability of 1.5 A, which can support  
wearable or mobile phone applications which Li−Ion  
batteries. Specialized soft−start limits the battery current to  
150 mA to limit any brown out occurrences.  
When the die temperature increases, due to a high load  
condition and/or a high ambient temperature, the output  
switching is disabled until the die temperature falls  
sufficiently. The junction temperature at which the thermal  
shutdown activates is nominally 150°C with a 15°C  
hysteresis. Once the junction temperature falls below the  
hysteresis threshold, the regulator performs a soft−start.  
Control Scheme  
Enable and Disable  
When EN pin is Low, all circuits are off and the IC draws  
Modes of Operations  
100 nA current. When EN is High and V is above its  
UVLO threshold, the regulator begins a soft−start cycle. The  
FAN53763 has internal soft−start which limits the battery  
IN  
SLIQ (Super Low IQ)  
In SLIQ Mode the device acts in a modified PFM mode  
with a super low Iq state. The part draws 2 mA with no load.  
The part enters SLIQ Mode when the Mode pin is set to  
logic “LOW”. Before pulling the Mode Pin Low, the load  
current should drop below 1 mA to maintain output voltage  
regulation in SLIQ mode. The maximum load current in  
SLIQ Mode that the device can support is 1 mA. If load  
current exceeds 1 mA, it is recommended to place part in  
Auto Mode by pulling Mode pin High so that the device can  
support more current.  
current draw to 150 mA. Once the part reaches 95% of V  
OUT  
target, the part will transition to the correct mode of  
operation depending on load current. The part starts up  
within 400 ms typical with the recommended external  
components listed in Table 1.  
MODE Pin  
Setting Mode Pin Low sets the device in SLIQ mode;  
setting Mode Pin High sets the device in normal Iq Auto  
Mode.  
The part can support more than 1mA in SLIQ Mode if the  
output capacitor is increased.  
Protection Features  
VOUT Fault  
PFM  
At light load operation in Auto Mode, the device enters  
PFM mode when load current is below 20 mA typically.  
PFM mode reduces switching frequency as well as battery  
current draw, which yields high efficiency.  
When Mode pin goes High, the part will transition from  
SLIQ Mode into normal PFM mode within 10 ms typically.  
If the V  
fails to reach 95% of V  
target within  
OUT  
OUT  
1.8 ms during startup, a VOUT fault is declared. During the  
fault condition the part restarts every 20 ms to achieve the  
95% target voltage. Once the output voltage reaches the 95%  
V
OUT  
target voltage within 1.8 ms, the VOUT fault clears.  
PWM  
Over−Current Protection (OCP)  
When load is high, the part transitions smoothly from  
PFM mode to PWM mode. The part enters PWM mode  
when load current exceeds 50 mA typically.  
A heavy load or short circuit on the output causes the  
current in the inductor to increase until a maximum current  
threshold is reached in the high−side switch. Upon reaching  
this point, the high−side switch turns off, preventing high  
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8
FAN53763  
Applications Information  
physical inductor size, increased inductance usually results  
in an inductor with lower saturation current and higher DCR.  
Table 9 shows the effects of inductance higher or lower  
than the recommended 1.0 mH on regulator performance.  
Selecting the Inductor  
The output inductor must meet both the required  
inductance and the energy-handling capability of the  
application. The inductor value affects average current limit,  
output voltage ripple, and efficiency.  
Output Capacitor  
Increasing C  
has no effect on loop stability and can  
OUT  
The ripple current (DI) of the regulator is:  
therefore be increased to reduce output voltage ripple or to  
improve transient response. Vice versa, lower C can be  
OUT  
VOUT  
VIN  
VIN * VOUT  
@ ǒ Ǔ  
L @ fSW  
used but with a compromise of load transient response.  
Output voltage ripple, DV , is:  
DI [  
(eq. 1)  
OUT  
The maximum average load current, I  
is  
MAX(LOAD),  
fSW @ COUT @ ESR2  
2 @ D @ (1 * D)  
1
related to the peak current limit, I  
, by the ripple  
+ DI ƪ  
ƫ
DVOUT  
)
LIM(PK)  
L
8 @ fSW @ COUT  
current, given by:  
(eq. 5)  
DI  
2
IMAX(LOAD) + ILIM(PK)  
*
(eq. 2)  
Input Capacitor  
The transition between PFM and PWM operation is  
determined by the point at which the inductor valley current  
crosses zero. The regulator DC current when the inductor  
The 2.2 mF ceramic input capacitor should be placed as  
close as possible between the VIN pin and GND to minimize  
the parasitic inductance. If a long wire is used to bring power  
to the IC, additional “bulk” capacitance (electrolytic or  
tantalum) should be placed between C and the power  
source lead to reduce the ringing that can occur between the  
inductance of the power source leads and C .  
The effective capacitance value decreases as V  
increases due to DC bias effects.  
current crosses zero, I , is:  
DCM  
DI  
2
IDCM  
+
(eq. 3)  
IN  
The FAN53763 is optimized for operation with L =  
1.0 mH, but is stable with inductances up to 1.3 H (nominal).  
The inductor should be rated to maintain at least 80% of its  
IN  
IN  
value at I  
.
LIM(PK)  
Efficiency is affected by the inductor DCR and inductance  
value. Decreasing the inductor value for a given physical  
size typically decreases the DCR; but because DI increases,  
the RMS current increases, as do the core and skin effect  
losses.  
PCB Layout Guidelines  
1. The input capacitor (C ) should be connected as  
IN  
close as possible to the VIN and GND pins.  
Connect to VIN and GND using only top metal.  
Do not route through vias (see Figure 27.)  
2. Place the inductor (L) as close as possible to the  
IC. Use short wide traces for the main current  
paths.  
DI2  
12  
2
+ Ǹ  
IRMS  
IOUT(DC)  
)
(eq. 4)  
The increased RMS current produces higher losses  
3. An output capacitor (C  
) should be placed as  
OUT  
through the R  
of the IC MOSFETs, as well as the  
DS(ON)  
close as possible to the IC. Connection to GND  
should only be on top metal. Feedback signal  
connection to VOUT should be routed away from  
noisy components and traces (e.g. SW line).  
inductor DCR.  
Increasing the inductor value produces lower RMS  
currents, but degrades transient response. For a given  
Table 9. EFFECTS OF CHANGES in Inductor Value (from 1.0 mH Recommended Value) on Regulator Performance  
Inductor Value  
Increase  
I
DV  
Transient Response  
Degraded  
MAX(LOAD)  
OUT  
Increase  
Decrease  
Increase  
Decrease  
Decrease  
Improved  
www.onsemi.com  
9
 
FAN53763  
Connect VIN pin and CIN  
using only top metal.  
Connect COUT and GND  
pin only on top layer;  
VOUT trace should be  
as wide and as short  
as possible, for low im­  
pedance, also should  
be routed away from  
noisy components and  
traces (e.g. SW line).  
Put as many as possible  
vias connected to ground  
plane (layer 2), to help dis­  
sipate heat. Connect GND  
vias to system ground.  
The ground area should be  
made as large as possible  
to help dissipate heat.  
Figure 22. Top Layer  
Layer 2 should be a solid  
ground layer, to shield VOUT  
from capacitive coupling of  
the fast edges of SW node.  
Logic signals can be routed  
on this layer.  
Figure 23. Layer 1  
SW trace should be as wide  
and as short as possible,  
and be isolated with GND  
area from any other sensi­  
tive traces.  
Figure 24. Layer 3  
www.onsemi.com  
10  
FAN53763  
PACKAGE DIMENSIONS  
WLCSP6 1.38x0.94x0.625  
CASE 567UH  
ISSUE O  
PRODUCT−SPECIFIC DIMENSIONS  
D
E
X
Y
1.380 0.030  
0.940 0.030  
0.270  
0.290  
www.onsemi.com  
11  
FAN53763  
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FAN53763/D  

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