FAN53713UC02X [ONSEMI]

1.5 A Synchronous Buck Regulator;
FAN53713UC02X
型号: FAN53713UC02X
厂家: ONSEMI    ONSEMI
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1.5 A Synchronous Buck Regulator

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FAN53713  
1.5 A Synchronous Buck  
Regulator  
Description  
The FAN53713 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 FAN53713 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  
2
5.5 mm . At moderate and light load, Pulse Frequency Modulation  
WLCSP6 1.38 0.94 0.625  
CASE 567UH  
(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 FAN53713 is available in 6−bump, 0.4 mm pitch, Wafer−Level  
Chip−Scale Package (WLCSP).  
12  
KK  
X
Y
Z
= Alphanumeric Device Marking  
= Lot Run Code  
= Alphabetical Year Code  
= 2 Weeks Date Code  
= Assembly Plant Code  
Features  
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  
ORDERING INFORMATION  
2.3 V to 5.5 V Input Voltage Range  
See detailed ordering and shipping information on page 2 of  
this data sheet.  
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  
FB  
V
L1  
IN  
V
OUT  
C
IN  
Protection Faults (UVLO, OCP and OTP)  
Thermal Shutdown and Overload Protection  
6−Bump WLCSP, 0.4 mm Pitch  
C
OUT  
2.2 mF  
1.0 mH  
22 mF  
FAN53713  
MODE  
EN  
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS  
GND  
Compliant  
Applications  
Figure 1. Typical Application  
Wearables  
Smart Watch  
Health Monitoring  
Sensor Drive  
Energy Harvesting  
Utility and Safety Modules  
RF Modules  
© Semiconductor Components Industries, LLC, 2017  
1
Publication Order Number:  
September, 2017 − Rev. 0  
FAN53713/D  
 
FAN53713  
Table 1. ORDERING INFORMATION  
Output Voltage  
Max. Output  
Current (Note 1)  
Temperature  
Packing  
Method  
Device  
Marking  
Range  
(Note 1)  
Part Number  
Package  
FAN53713UC02X  
0.7 V  
1.5 A  
−40 to 85°C  
WLCSP  
Tape & Reel  
GJ  
1. Other voltage and output current options are available. Contact an On Semiconductor representative.  
Table 2. RECOMMENDED EXTERNAL COMPONENTS  
Component  
Description  
Vendor  
Parameter  
Typ.  
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
1.0  
2.2  
22  
mH  
C
IN  
mF  
C
(Note 1)  
OUT  
1. 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  
Description  
A1  
EN  
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
IN  
Input Voltage  
6.5  
V
V
SW  
Voltage on SW Pin  
V
V
+ 0.3 (Note 1)  
+ 0.3 (Note 1)  
V
V
IN  
V
CTRL  
EN, FB and Mode Pin Voltage  
Human Body Model per JESD22−A114  
Charged Device Model per JESD22−C101  
Junction Temperature  
IN  
ESD  
kV  
2.0  
1.0  
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.  
1. Lesser of 6 V or V + 0.3 V.  
IN  
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2
 
FAN53713  
Table 5. RECOMMENDED OPERATING CONDITIONS  
Symbol  
Parameter  
Supply Voltage Range  
Min.  
Typ.  
Max.  
Unit  
V
IN  
2.3  
0
5.5  
1.5  
1.6  
V
A
I
Continuous Output Current  
Pulsed Output Current, 100 ms  
Input Capacitor  
OUT  
0
A
C
2.2  
1.0  
mF  
mF  
mH  
°C  
°C  
IN  
C
(Note 1)  
L
Output Capacitor  
3
100  
1.3  
OUT  
Inductor  
0.47  
−40  
−40  
T
A
Operating Ambient Temperature  
Operating Junction Temperature  
+85  
+125  
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.  
1. Effective capacitance after DC bias.  
Table 6. THERMAL PROPERTIES  
Symbol  
Parameter  
Min.  
Typ.  
Max.  
Unit  
θ
JA  
Junction−to−Ambient Thermal Resistance (Note 1)  
125  
°C/W  
1. 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  
IN  
EN  
A
+85°C, unless otherwise noted. Typical values are at T = 25°C, V = V = 3.6 V, V = 1.8 V  
A
IN  
EN  
OUT  
Symbol  
Parameter  
Quiescent Current  
Condition  
Min.  
Typ.  
Max.  
Unit  
I
SLIQ Mode, no load, non−switching  
PFM Mode, no load, non−switching  
2
mA  
mA  
nA  
V
Q,SLIQ  
I
PFM Quiescent Current  
5
Q,PFM  
I
Shutdown Supply Current  
Under−Voltage Lockout Threshold  
EN=GND, V =3.6 V, no load  
100  
2.15  
2.05  
SD  
IN  
V
V
V
IN  
V
IN  
Rising  
Falling  
2.10  
2.00  
1.2  
2.21  
2.10  
UVLO_RISE  
UVLO_FALL  
V
V
IH  
HIGH−Level Input Voltage  
LOW−Level Input Voltage  
V
0.4  
V
V
IL  
I
Peak Current Limit  
V
V
= 4.35 V  
2215  
mA  
mV  
LIM  
IN  
V
R
Output Voltage Accuracy  
= 0.6 V to 1.8 V, I  
= 0,  
= 0,  
−25  
−40  
+25  
+40  
OACC  
OUT  
OUT(DC)  
PWM Mode  
V
OUT  
= 0.6 V to 1.8 V, I  
mV  
OUT(DC )  
PFM Mode  
PMOS On Resistance  
NMOS On Resistance  
Thermal Shutdown  
V
V
= V = 3.6 V  
135  
95  
mW  
mW  
°C  
DS(on)  
IN  
GS  
= V = 3.6 V  
IN  
GS  
T
150  
15  
TSD  
T
Thermal Shutdown Hysteresis  
°C  
HYS  
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
 
FAN53713  
Table 8. SYSTEM CHARACTERISTICS The following system characteristics are guaranteed by design and are not performed in  
production testing. Recommended operating conditions, unless otherwise noted, V = 2.3 V to 5.5 V, T = −40°C to +85°C, V = 1.8  
IN  
A
OUT  
V. Typical values are given at T = 25°C, V = 3.6 V. System characteristics are based on circuit per Figure 1.  
A
IN  
L = 1.0 mH, 2.3 A, 107 mW DCR, DFE160810S−1R0M (Murata), C = 1 × 2.2 mF, 6.3 V, 0402 (1005 metric), C1005X5R0J225M050BC  
IN  
(TDK) and C  
= 1 × 22 mF, 6.3 V, 0603 (1608 metric), C1608X5R0J226M080AC (TDK).  
OUT  
Symbol  
Parameter  
Condition  
Min.  
Typ.  
−9.0  
−2.0  
−0.5  
Max.  
Unit  
LOAD  
Load Regulation  
I
I
= 10 mA to 1 mA, SLIQ Mode  
= 200 mA to 300 mA, PWM  
mV/mA  
mV/A  
REG  
OUT  
OUT  
LINE  
Line Regulation  
Ripple Voltage  
3.0 V V 4.35 V,  
mV/V  
REG  
IN  
I
I
I
I
= 1 A, PWM  
OUT  
OUT  
OUT  
OUT  
V
mV  
%
= 250 mA, SLIQ Mode  
= 20 mA, PFM Mode  
= 200 mA, PWM Mode  
40  
25  
5
OUT_RIPPLE  
88  
Eff  
Efficiency  
I
I
I
I
I
I
I
I
= 100 mA, SLIQ Mode  
= 500 mA, SLIQ Mode  
= 1 mA, PFM Mode  
OUT  
91  
90  
91  
91  
90  
88  
40  
OUT  
OUT  
OUT  
OUT  
OUT  
OUT  
OUT  
= 100 mA, PFM Mode  
= 300 mA, PWM Mode  
= 500 mA, PWM Mode  
= 700 mA, PWM Mode  
= 10 mA 150 mA,  
%
Eff  
Efficiency  
mV  
mV  
mV  
ΔV  
Load Transient  
OUT_LOAD  
T
= T = 1 ms, Auto Mode  
R
F
15  
20  
I
= 100 mA 500 mA,  
= T = 1 ms, SLIQ Mode  
OUT  
T
R
F
ΔV  
Line Transient  
V
= 3.0 V 3.6 V, T = T = 10 ms,  
OUT_LINE  
IN  
R
F
I
= 300 mA, PWM Mode  
OUT  
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4
FAN53713  
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
94%  
90%  
86%  
82%  
94%  
90%  
86%  
82%  
78%  
74%  
70%  
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  
78%  
74%  
70%  
40  
°C  
+25°C  
+85°C  
1
10  
100  
1,000  
1,000  
1
10  
100  
Load Current (mA)  
Load Current (mA)  
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%  
95%  
90%  
85%  
80%  
75%  
70%  
65%  
60%  
55%  
50%  
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  
60%  
55%  
50%  
°C  
+25  
+85°C  
0.01  
0.10  
1.00  
0.01  
0.10  
1.00  
Load Current (mA)  
Load Current (mA)  
Figure 7. Efficiency vs. Load Current and  
Temperature, VIN = 3.6 V , VOUT = 1.8 V, SLIQ Mode  
Figure 6. Efficiency vs. Load Current and Input Voltage,  
OUT = 1.8 V, SLIQ Mode  
V
3,000  
2,500  
2,000  
1,500  
1,000  
500  
60  
V
IN  
V
IN  
V
IN  
V
IN  
= 2.5 V  
= 3.0 V  
= 3.6 V  
= 4.2 V  
50  
40  
30  
20  
10  
0
V
V
V
V
= 2.5 V  
= 3.0 V  
= 3.6 V  
= 4.2 V  
IN  
IN  
IN  
IN  
0
0
250  
500  
750  
1000  
1250  
1500  
1500  
0
250  
500  
750  
1000  
1250  
Load Current (mA)  
Load Current (mA)  
Figure 8. Frequency vs. Load Current and Input Voltage,  
Auto Mode, VOUT = 1.8 V, Auto Mode  
Figure 9. Output Ripple vs. Load Current and  
Input Voltage, VOUT = 1.8 V, Auto Mode  
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5
FAN53713  
Typical Characteristics (continued)  
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
2.0  
2.0  
1.5  
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  
1.5  
1.0  
1.0  
0.5  
0.0  
0.5  
−0.5  
−1.0  
−1.5  
−2.0  
0.0  
−40°C  
+25°C  
+85°C  
−0.5  
−1.0  
0
250  
500  
750  
1000  
1250  
1500  
0
250  
500  
750  
1000  
1250  
1500  
Load Current (mA)  
Load Current (mA)  
Figure 10. Output Regulation vs. Load Current and  
Input Voltage, VOUT = 1.8 V, Auto Mode  
Figure 11. Output Regulation vs. Load Current and  
Temperature, VIN = 3.6 V, VOUT = 1.8 V, Auto Mode  
4
3
2
1
8
7
6
5
4
−40°C  
+25°C  
+85°C  
−40°C  
+25°C  
+85°C  
3
2
0
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 13. Quiescent Current vs. Input Voltage and  
Temperature, VOUT = 1.8 V, SLIQ Mode  
Figure 12. Quiescent Current vs. Input Voltage and  
Temperature, VOUT = 1.8 V, Auto Mode  
0.5  
−40°C  
+25°C  
+85°C  
0.4  
0.3  
0.2  
0.1  
0.0  
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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6
FAN53713  
Typical Characteristics (continued)  
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
Figure 16. Load Transient, VIN = 3.6 V, VOUT = 1.8 V,  
Figure 17. Load Transient, VIN = 3.6 V, VOUT = 1.8 V,  
5 mA 300 mA, 1 ms Edge, Auto Mode  
100 mA 300 mA, 1 ms Edge, Auto Mode  
Figure 19. Line Transient, VIN = 3.0 V 3.6 V,  
Figure 18. Load Transient, VIN = 3.6 V, VOUT = 1.8 V,  
V
OUT = 1.8 V, 10 ms Edge, 300 mA Load, Auto Mode  
10 mA 1500 mA, 1 ms Edge, 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
FAN53713  
Operation Description  
The FAN53713 is a Super Low Iq (SLIQ), step−down  
switching voltage regulator, typically operating at 2.5 MHz  
this point, the high−side switch turns off, preventing high  
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 20 ms before attempting  
a restart.  
in Continuous Conduction Mode(CCM). Using  
a
proprietary architecture with synchronous rectification, the  
FAN53713 is capable of delivering a peak efficiency of  
93%, while maintaining efficiency over 90% at load currents  
sub 1mA.  
In SLIQ mode the device is very efficient with load  
currents in the uA 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.  
The FAN53713 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 use Li−Ion  
batteries. Specialized soft−start limits the battery current to  
150 mA to limit any brown out occurrences.  
Over−Temperature Protection (OTP)  
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  
IN  
UVLO threshold, the regulator begins a soft−start cycle. The  
FAN53713 has internal soft−start which limits the battery  
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 2.  
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 1 mA 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 100 mA typically.  
PFM mode reduces switching frequency as well as battery  
current draw, which yields high efficiency.  
If the V  
ms during startup, a V  
condition the part restarts every 20 ms to achieve the 95%  
target voltage. Once the output voltage reaches the 95%  
fails to reach 95% of V  
target within 1.8  
OUT  
OUT  
fault is declared. During the fault  
OUT  
When Mode pin goes High, the part will transition from  
SLIQ Mode into normal PFM mode within 10 ms, typically.  
V
target voltage within 1.8 ms during startup, the V  
OUT  
OUT  
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 132 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  
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8
FAN53713  
Applications Information  
physical inductor size, increased inductance usually results  
in an inductor with lower saturation current and higher DCR.  
Table 3 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 (ΔI) 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  
DI ≈  
 
used but with a compromise of load transient response.  
Output voltage ripple, ΔV , is:  
(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  
current, given by:  
, by the ripple  
LIM(PK)  
+ DI ƪ  
ƫ(eq. 5)  
DVOUT  
)
L
8   FSW   COUT  
DI  
*
IMAX(LOAD) + ILIM(PK)  
Input Capacitor  
2
(eq. 2)  
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  
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  
current crosses zero, I , is:  
DCM  
tantalum) should be placed between C and the power  
IN  
DI  
2
IDCM  
+
source lead to reduce the ringing that can occur between the  
(eq. 3)  
inductance of the power source leads and C .  
The effective capacitance value decreases as V  
increases due to DC bias effects.  
IN  
The FAN53713 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  
value at I  
.
LIM(PK)  
PCB Layout Guidelines  
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.  
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 22)  
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)  
3. An output capacitor (C  
) should be placed as  
OUT  
The increased RMS current produces higher losses  
through the R of the IC MOSFETs, as well as the  
inductor DCR.  
Increasing the inductor value produces lower RMS  
currents, but degrades transient response. For a given  
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)  
DS(ON)  
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
FAN53713  
Connect V pin and C using only top metal.  
IN  
IN  
Connect C  
and GND pin only on top layer  
OUT  
VOUT trace should be as wide and as short  
as possible, for low impedance, 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 dissipate 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 sensitive traces.  
Figure 24. Layer 3  
www.onsemi.com  
10  
FAN53713  
PACKAGE DIMENSIONS  
WLCSP6 1.38 0.94 0.625  
CASE 567UH  
ISSUE O  
Table 10. PRODUCT−SPECIFIC DIMENSIONS  
D
E
X
Y
1.380 0.030  
0.940 0.030  
0.270  
0.290  
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11  
FAN53713  
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FAN53713/D  

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