MPM3804GG [MPS]

0.6A, 5.5V Input Step-Down Module Synchronous Regulator with Integrated Inductor in Ultra-Small 2x2x0.9mm QFN Package;
MPM3804GG
型号: MPM3804GG
厂家: MONOLITHIC POWER SYSTEMS    MONOLITHIC POWER SYSTEMS
描述:

0.6A, 5.5V Input Step-Down Module Synchronous Regulator with Integrated Inductor in Ultra-Small 2x2x0.9mm QFN Package

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MPM3804  
0.6A, 5.5V Input Step-Down Module  
Synchronous Regulator with Integrated Inductor  
in Ultra-Small 2x2x0.9mm QFN Package  
DESCRIPTION  
FEATURES  
The MPM3804 is a monolithic, step-down,  
switch-mode converter with built-in, internal  
power MOSFETs and an inductor. The  
MPM3804 achieves 0.6A of continuous output  
current from a 2.3V to 5.5V input voltage range  
with excellent load and line regulation. The  
output voltage can be regulated as low as 0.6V.  
Only input capacitors, output capacitors, and  
feedback (FB) resistors are required to  
complete the design.  
Up to 91% Peak Efficiency  
Low IQ: 11μA  
Wide 2.3V to 5.5V Operating Input Range  
Output Voltage as Low as 0.6V  
100% Duty Cycle in Dropout  
0.6A Output Current  
120mΩ and 80mΩ Internal Power  
MOSFETs  
2.4MHz Frequency  
EN and Power Good for Power Sequencing  
Cycle-by-Cycle Over-Current Protection  
(OCP)  
0.5ms Internal Soft-Start Time  
Output Discharge  
Short-Circuit Protection (SCP) with Hiccup  
Mode  
Thermal Shutdown  
The constant-on-time (COT) control scheme  
provides a fast transient response, high  
light•load efficiency, and easy loop stabilization.  
Full protection features include cycle•by•cycle  
current limiting and thermal shutdown.  
The MPM3804 is ideal for a wide range of  
applications, including high-performance DSPs,  
wireless power, portable and mobile devices,  
and other low-power systems.  
Stable with Low ESR Output Ceramic  
Capacitors  
Ultra-Small 2mm x 2mm x 0.9mm QFN-10  
Package  
The MPM3804 requires a minimal number of  
readily  
available,  
standard,  
external  
APPLICATIONS  
components and is available in an ultra-small  
QFN-10 (2mmx2mm) package.  
Optical Modules  
Industrial Products  
IOT Devices  
Space Constrained Applications  
Low-Voltage I/O Supplies  
LDO Replacement  
All MPS parts are lead-free, halogen-free, and adhere to the RoHS  
directive. For MPS green status, please visit the MPS website under Quality  
Assurance. “MPS” and “The Future of Analog IC Technology” are registered  
trademarks of Monolithic Power Systems, Inc.  
TYPICAL APPLICATION  
VIN  
VOUT  
2.3V to 5.5V  
1.2V/0.6A  
VIN  
OUT  
C2  
22µF  
C1  
10µF  
MPM3804  
R1  
200kΩ  
FB  
EN  
EN  
R2  
200kΩ  
GND  
MPM3804 Rev.1.0  
5/2/2018  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2018 MPS. All Rights Reserved.  
1
MPM3804 0.6A, 5.5V INPUT STEP-DOWN MODULE SYNCHRONOUS  
REGULATOR WITH INTEGRATED INDUCTOR IN ULTRA-SMALL 2X2X0.9MM QFN PACKAGE  
ORDERING INFORMATION  
Part Number  
Package  
Top Marking  
MPM3804GG*  
MPM3804GG-12**  
MPM3804GG-15**  
MPM3804GG-18**  
MPM3804GG-25**  
MPM3804GG-33**  
QFN-10 (2mmx2mm)  
See Below  
* FOR TAPE & REEL, ADD SUFFIX Z (E.G. MPM3804GGZ)  
** For fixed output options, please contact the factory (the fixed output versions have not been released yet).  
TOP MARKING  
DL: Product code of MPM3804GG  
Y: Year code  
LLL: Lot number  
PACKAGE REFERENCE  
TOP VIEW  
TOP VIEW  
GND  
GND  
VIN  
SW  
SW  
SW  
PG  
VIN  
SW  
SW  
SW  
FB  
OUT  
OUT  
OUT  
OUT  
OUT  
OUT  
EN  
EN  
MPM3804GG-12 MPM3804GG-15  
MPM3804GG-18 MPM3804GG-25  
MPM3804GG-33  
MPM3804GG  
QFN-10 (2mmx2mm)  
MPM3804 Rev.1.0  
5/2/2018  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2018 MPS. All Rights Reserved.  
2
MPM3804 0.6A, 5.5V INPUT STEP-DOWN MODULE SYNCHRONOUS  
REGULATOR WITH INTEGRATED INDUCTOR IN ULTRA-SMALL 2X2X0.9MM QFN PACKAGE  
Thermal Resistance (4)  
QFN-10 (2mmx2mm) ............ 80.......16 ... °C/W  
θJA  
θJC  
ABSOLUTE MAXIMUM RATINGS (1)  
Supply voltage (VIN)......................................6V  
VSW ...............................-0.3V (-5V for <10ns) to  
6V (8V for <10ns or 10V for <3ns)  
NOTES:  
1) Exceeding these ratings may damage the device.  
2) The maximum allowable power dissipation is a function of the  
maximum junction temperature TJ (MAX), the junction-to-  
ambient thermal resistance θJA, and the ambient temperature  
TA. The maximum allowable continuous power dissipation at  
any ambient temperature is calculated by PD (MAX) = (TJ  
(MAX)-TA)/θJA. Exceeding the maximum allowable power  
dissipation produces an excessive die temperature, causing  
the regulator to go into thermal shutdown. Internal thermal  
shutdown circuitry protects the device from permanent  
damage.  
All other pins.................................... -0.3V to 6V  
Junction temperature...............................150°C  
Lead temperature ....................................260°C  
(2)  
Continuous power dissipation (TA = +25°C)  
……….….. .................................................1.6W  
Storage temperature................-65°C to +150°C  
Recommended Operating Conditions (3)  
Supply voltage (VIN)...................... 2.3V to 5.5V  
Operating junction temp. (TJ). ..-40°C to +125°C  
3) The device is not guaranteed to function outside of its  
operating conditions.  
4) Measured on JESD51-7, 4-layer PCB.  
MPM3804 Rev.1.0  
5/2/2018  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2018 MPS. All Rights Reserved.  
3
MPM3804 0.6A, 5.5V INPUT STEP-DOWN MODULE SYNCHRONOUS  
REGULATOR WITH INTEGRATED INDUCTOR IN ULTRA-SMALL 2X2X0.9MM QFN PACKAGE  
ELECTRICAL CHARACTERISTICS  
VIN = 3.6V, TJ = -40°C to +125°C, typical value is tested at TJ = +25°C. The limit over temperature  
is guaranteed by characterization, unless otherwise noted.  
Parameter  
Symbol Condition  
Min  
Typ  
Max  
Units  
2.3V ≤ VIN 5.5V,  
TJ = 25°C  
0.594  
0.591  
0.600  
0.606  
Feedback voltage  
VFB  
V
2.3V ≤ VIN 5.5V  
VFB = 0.65V  
0.600  
50  
0.609  
100  
Feedback current  
IFB  
nA  
P-FET switch on resistance  
N-FET switch on resistance  
Dropout resistance  
RDSON_P  
RDSON_N  
RDR  
120  
80  
mΩ  
mΩ  
mΩ  
100% on duty  
440  
VEN = 0V, VIN = 6V,  
VSW = 0V, TJ = 25°C  
Switch leakage  
0
1
μA  
P-FET peak current limit  
N-FET valley current limit  
1
1.3  
0.4  
1.6  
A
A
VOUT = 1.2V  
TJ = -40°C to +85°C(6)  
1920  
1800  
2400  
2400  
60  
2910  
3000  
kHz  
kHz  
ns  
Switching frequency  
fs  
Minimum off time  
Minimum on time(5)  
Soft-start time  
TMIN-OFF  
TMIN-ON  
TSS-ON  
60  
ns  
0.5  
ms  
Under-voltage lockout  
threshold rising  
2
2.25  
0.4  
V
Under-voltage lockout  
threshold hysteresis  
150  
mV  
EN input logic-low voltage  
EN input logic-high voltage  
V
1.2  
V
VEN = 2V  
1.2  
0
μA  
μA  
μA  
EN input current  
VEN = 0V  
Supply current (shutdown)  
Supply current (quiescent)  
Thermal shutdown(6)  
VEN = 0V, TJ = 25°C  
0
1
VEN = 2V, VIN = 3.6V, 5V,  
VFB = 0.63V, TJ = 25°C  
11  
160  
30  
15  
μA  
°C  
°C  
Thermal hysteresis(6)  
Output discharge resistor  
Output inductor  
RDIS  
L
VEN = 0V, VOUT = 1.2V  
Test frequency = 1MHz  
1
1
kΩ  
μH  
DCR  
0.24  
0.32  
0.4  
NOTES:  
5) Guaranteed by characterization.  
6) Guaranteed by design.  
MPM3804 Rev.1.0  
www.MonolithicPower.com  
4
5/2/2018  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2018 MPS. All Rights Reserved.  
MPM3804 0.6A, 5.5V INPUT STEP-DOWN MODULE SYNCHRONOUS  
REGULATOR WITH INTEGRATED INDUCTOR IN ULTRA-SMALL 2X2X0.9MM QFN PACKAGE  
TYPICAL PERFORMANCE CHARACTERISTICS  
VIN = 5V, VOUT = 1.2V, COUT = 22μF, TA = +25°C, unless otherwise noted.  
MPM3804 Rev.1.0  
5/2/2018  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2018 MPS. All Rights Reserved.  
5
MPM3804 0.6A, 5.5V INPUT STEP-DOWN MODULE SYNCHRONOUS  
REGULATOR WITH INTEGRATED INDUCTOR IN ULTRA-SMALL 2X2X0.9MM QFN PACKAGE  
TYPICAL PERFORMANCE CHARACTERISTICS (continued)  
VIN = 5V, VOUT = 1.2V, COUT = 22μF, TA = +25°C, unless otherwise noted.  
MPM3804 Rev.1.0  
5/2/2018  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2018 MPS. All Rights Reserved.  
6
MPM3804 0.6A, 5.5V INPUT STEP-DOWN MODULE SYNCHRONOUS  
REGULATOR WITH INTEGRATED INDUCTOR IN ULTRA-SMALL 2X2X0.9MM QFN PACKAGE  
TYPICAL PERFORMANCE CHARACTERISTICS (continued)  
VIN = 5V, VOUT = 1.2V, COUT = 22μF, TA = +25°C, unless otherwise noted.  
MPM3804 Rev.1.0  
5/2/2018  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2018 MPS. All Rights Reserved.  
7
MPM3804 0.6A, 5.5V INPUT STEP-DOWN MODULE SYNCHRONOUS  
REGULATOR WITH INTEGRATED INDUCTOR IN ULTRA-SMALL 2X2X0.9MM QFN PACKAGE  
TYPICAL PERFORMANCE CHARACTERISTICS (continued)  
VIN = 5V, VOUT = 1.2V, COUT = 22μF, TA = +25°C, unless otherwise noted.  
MPM3804 Rev.1.0  
5/2/2018  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2018 MPS. All Rights Reserved.  
8
MPM3804 0.6A, 5.5V INPUT STEP-DOWN MODULE SYNCHRONOUS  
REGULATOR WITH INTEGRATED INDUCTOR IN ULTRA-SMALL 2X2X0.9MM QFN PACKAGE  
PIN FUNCTIONS  
Pin #  
Name  
Description  
Supply voltage. The MPM3804 operates from a +2.3V to +5.5V unregulated input. A  
decoupling capacitor is needed to prevent large voltage spikes from appearing at the  
input.  
1
VIN  
Output switching node. SW is the drain of the internal, high-side, P-channel  
MOSFET. SW is not for testing and is for internal use only.  
2, 3, 4  
5
SW  
EN  
On/off control.  
Output voltage power rail and output voltage input sense. Connect the load to  
OUT. An output capacitor is needed to decrease the output voltage ripple.  
6, 7, 8  
OUT  
MPM3804GG: Feedback. An external resistor divider from the output to GND tapped  
to FB sets the output voltage.  
MPM3804GG-XX: Power good indicator. The output of PG is an open-drain output.  
9
FB/PG  
GND  
10  
Power ground.  
MPM3804 Rev.1.0  
5/2/2018  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2018 MPS. All Rights Reserved.  
9
MPM3804 0.6A, 5.5V INPUT STEP-DOWN MODULE SYNCHRONOUS  
REGULATOR WITH INTEGRATED INDUCTOR IN ULTRA-SMALL 2X2X0.9MM QFN PACKAGE  
BLOCK DIAGRAM  
VIN  
Bias  
&
Voltage  
Soft start  
EN  
+
VTH  
COMP  
Reference  
-
SW  
Lo-Iq  
Main  
Switch  
(PCH)  
0.6V  
RST  
PDRV  
+
+
-
Constant  
On- Time  
Pulse  
PWM  
E.A.  
PWM  
Lo-Iq  
+
+
-
EN  
OUT  
FBCOMP  
Lo-Iq  
Driver  
FB  
(Option 1)  
VOUT  
Synchronous  
Rectifier  
Ramp  
generator  
SW  
( NCH)  
NDRV  
Hi-Z  
Lo-Iq  
OUT  
GND  
Fixed Rev  
+
FB for  
fixed output  
COMP  
-
+
COMP  
-
Lo Iq  
0.54V  
-
PG  
(Option 2)  
Figure 1: Functional Block Diagram  
NOTE: FB is only for the MPM3804GG (option 1); PG is only for the MPM3804GG-XX (option 2).  
MPM3804 Rev.1.0  
5/2/2018  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2018 MPS. All Rights Reserved.  
10  
MPM3804 0.6A, 5.5V INPUT STEP-DOWN MODULE SYNCHRONOUS  
REGULATOR WITH INTEGRATED INDUCTOR IN ULTRA-SMALL 2X2X0.9MM QFN PACKAGE  
When the loading becomes lighter, the ripple of  
OPERATION  
the output voltage is bigger and drives the error  
amplifier output (EAO) lower. When the EAO  
reaches the internal low threshold, it is clamped  
at that level, and the MPM3804 enters sleep  
mode. During sleep mode, the valley of the FB  
voltage is regulated to the internal reference  
voltage, and the average output voltage is  
slightly higher than the output voltage in  
discontinuous conduction mode (DCM) or  
continuous conduction mode (CCM). The on-  
time pulse in sleep mode is around 40% larger  
than that in DCM or CCM. Figure 3 shows the  
average FB voltage relationship with the  
internal reference in sleep mode.  
The MPM3804 uses a constant-on-time (COT)  
control with input voltage feed-forward to  
stabilize the switching frequency over the full  
input range. The MPM3804 achieves 0.6A of  
continuous output current from a 2.3V to 5.5V  
input voltage range with excellent load and line  
regulation. The output voltage can be regulated  
as low as 0.6V.  
Constant-On-Time (COT) Control  
Compared to fixed-frequency PWM control,  
constant-on-time (COT) control offers a simpler  
control loop and faster transient response. By  
using an input voltage feed-forward, the  
FB  
MPM3804 maintains  
a
nearly constant  
Average FB  
switching frequency across the input and output  
voltage ranges. The switching pulse on time  
can be estimated with Equation (1):  
Vref  
Figure 3: FB Average Voltage in Sleep Mode  
When the MPM3804 is in sleep mode, the  
average output voltage is higher than the  
internal reference voltage. The EAO is kept low  
and clamped in sleep mode. When the load  
V
OUT .0.417s  
(1)  
TON  
V
IN  
To prevent inductor current runaway during the  
load transient, the MPM3804 has a fixed  
minimum off time of 60ns. This minimum off  
time limit will not affect operation in steady state  
in any way.  
increases, the PWM switching  
period  
decreases to keep the output voltage regulated,  
and the output voltage ripple decreases  
relatively. Once the EAO is higher than the  
internal low threshold, the MPM3804 exits sleep  
mode and enters DCM or CCM depending on  
the load. In DCM or CCM, the error amplifier  
regulates the average output voltage to the  
internal reference (see Figure 4).  
Sleep-Mode Operation  
The MPM3804 uses sleep mode to achieve  
high efficiency at extremely light loads. In sleep  
mode, most of the circuit blocks are turned off  
except for the error amplifier and PWM  
comparator. Therefore, the operation current is  
reduced to a minimal value (see Figure 2).  
FB+Ramp  
Average FB= REF  
EA out  
Figure 4: DCM Control  
Bias  
&
Voltage  
Reference  
There is always a loading hysteresis when  
entering and exiting sleep mode due to the  
error amplifier clamping response time.  
Soft start  
0.6V  
AAM Operation at Light-Load Operation  
+
+
-
The MPM3804 uses advanced asynchronous  
modulation (AAM) power-save mode together  
with a zero-current cross detection (ZCD) circuit  
for light load.  
E.A.  
Lo-Iq  
+
+
-
FBCOMP  
Lo-Iq  
FB  
The MPM3804 has AAM power-save mode for  
light load. Figure 5 shows the simplified AAM  
control theory. The AAM current (IAAM) is set  
Ramp  
generator  
SW  
Figure 2: Operation Blocks at Sleep Mode  
MPM3804 Rev.1.0  
5/2/2018  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2018 MPS. All Rights Reserved.  
11  
MPM3804 0.6A, 5.5V INPUT STEP-DOWN MODULE SYNCHRONOUS  
REGULATOR WITH INTEGRATED INDUCTOR IN ULTRA-SMALL 2X2X0.9MM QFN PACKAGE  
internally. In light-load condition, the SW on  
pulse time is determined by the on-time  
Power  
MPM3804GG-XX)  
Good  
Indicator  
(only  
for  
generator and AAM comparator.  
The MPM3804 has an open drain and requires  
an external pull-up resistor (100kΩ~500kΩ) for  
the power good (PG) indicator. When VFB is  
within -10% of regulation voltage, VPG is pulled  
up to VIN by the external resistor. If VFB  
exceeds the -10% window, the internal  
MOSFET pulls PG to ground. The MOSFET  
has a maximum RDS(ON) of less than 100Ω.  
VFB  
EN  
COT  
Generator  
HS_driver  
VREF  
S
Q
FBCOMP  
R
IL_ sense  
IAAM  
AAMCOMP  
Figure 5: Simplified AAM Control Logic  
The MPM3804 uses a ZCD to determine when  
the inductor current starts to reverse. When the  
inductor current reaches the ZCD threshold, the  
low-side switch is turned off.  
Current Limit  
The MPM3804 has a 1.3A, high-side, switch-  
current limit, typically. When the high-side  
switch reaches its current limit, the MPM3804  
remains in hiccup mode until the current drops.  
This prevents the inductor current from  
continuing to rise and damaging components.  
AAM mode together with the ZCD circuit makes  
the MPM3804 work in DCM at light load  
continuously, even if VOUT is close to VIN.  
Short Circuit and Recovery  
Enable (EN)  
The MPM3804 enters short-circuit protection  
(SCP) mode when it reaches the current limit  
and attempts to recover with hiccup mode. The  
MPM3804 disables the output power stage,  
discharges the soft-start capacitor, and  
attempts to soft start automatically. If the short-  
circuit condition remains after the soft start  
ends, the MPM3804 repeats this cycle until the  
short circuit is removed and the output rises  
back to regulation levels.  
When the input voltage is greater than the  
under-voltage lockout (UVLO) threshold  
(typically 2V), the MPM3804 can be enabled by  
pulling EN higher than 1.2V. Leave EN floating  
or pull EN down to ground to disable the  
MPM3804. There is an internal 1MΩ resistor  
from EN to ground.  
When the device is disabled, the part goes into  
output discharge mode automatically. The  
internal discharge MOSFET provides a resistive  
discharge path for the output capacitor.  
Soft Start (SS)  
The MPM3804 has a built-in soft start (SS) that  
ramps up the output voltage at a controlled slew  
rate to avoid overshooting at start-up. The soft-  
start time is about 0.5ms, typically.  
MPM3804 Rev.1.0  
5/2/2018  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2018 MPS. All Rights Reserved.  
12  
MPM3804 0.6A, 5.5V INPUT STEP-DOWN MODULE SYNCHRONOUS  
REGULATOR WITH INTEGRATED INDUCTOR IN ULTRA-SMALL 2X2X0.9MM QFN PACKAGE  
The input capacitor requires an adequate ripple  
APPLICATION INFORMATION  
Setting the Output Voltage (only for  
MPM3804GG)  
current rating since it absorbs the input  
switching current. Estimate the RMS current in  
the input capacitor with Equation (3):  
The external resistor divider sets the output  
voltage (see the Typical Application Circuits on  
page 15). Select the feedback resistor (R1) to  
reduce the VOUT leakage current, typically  
between 40kΩ to 200kΩ. There is no strict  
requirement on the feedback resistor. R1 >  
10kΩ is reasonable for most applications. R2  
can be calculated with Equation (2):  
VOUT  
VOUT  
1  
(3)  
IC1 ILOAD  
V
V
IN  
IN  
The worst-case scenario occurs at VIN = 2VOUT  
shown in Equation (4):  
,
ILOAD  
IC1   
(4)  
2
For simplification, choose an input capacitor  
with an RMS current rating greater than half of  
the maximum load current.  
R1  
(2)  
R2   
Vout  
1  
0.6  
The input capacitor can be electrolytic,  
tantalum, or ceramic. When using electrolytic or  
tantalum capacitors, add a small, high-quality,  
0.1μF, ceramic capacitor as close to the IC as  
possible. When using ceramic capacitors,  
ensure that they have enough capacitance to  
provide a sufficient charge to prevent excessive  
voltage ripple at the input. The input voltage  
ripple caused by the capacitance can be  
estimated with Equation (5):  
Figure 6 shows the feedback circuit.  
VOUT  
MPM3804  
R1  
FB  
R2  
ILOAD VOUT  
V
OUT   
IN  
Figure 6: Feedback Network  
(5)  
V   
1  
IN  
fS C1  
VIN  
V
Table 1 lists the recommended resistor values  
for common output voltages.  
Selecting the Output Capacitor  
Table 1: Resistor Values for Common Output  
Voltages  
The output capacitor (C2) stabilizes the DC  
output voltage. Low ESR ceramic capacitors  
are recommended to limit the output voltage  
ripple. Estimate the output voltage ripple with  
Equation (6):  
VOUT (V)  
1.0  
R1 (kΩ)  
200 (1%)  
200 (1%)  
200 (1%)  
200 (1%)  
200 (1%)  
R2 (kΩ)  
300 (1%)  
200 (1%)  
100 (1%)  
63.2 (1%)  
44.2 (1%)  
1.2  
   
VOUT  
VOUT  
1
1.8  
(6)  
VOUT  
1  
RESR   
   
fS L1  
V
8fS C2  
IN    
2.5  
3.3  
Where L1 is the inductor value, and RESR is the  
equivalent series resistance (ESR) value of the  
output capacitor. The MPM3804 has an  
internal, co-packaged, 1µH power inductor.  
Selecting the Input Capacitor  
The input current to the step-down converter is  
discontinuous and therefore requires  
a
When  
using  
ceramic  
capacitors,  
the  
capacitor to supply AC current to the step-down  
converter while maintaining the DC input  
voltage. Use low ESR capacitors for the best  
performance. Ceramic capacitors with X5R or  
X7R dielectrics are highly recommended  
because of their low ESR and small  
temperature coefficients. Typically, a 10µF input  
capacitor is sufficient for most applications.  
capacitance dominates the impedance at the  
switching frequency and causes most of the  
output voltage ripple. For simplification, the  
MPM3804 Rev. 1.0  
5/2/2018  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2018 MPS. All Rights Reserved.  
13  
MPM3804 0.6A, 5.5V INPUT STEP-DOWN MODULE SYNCHRONOUS  
REGULATOR WITH INTEGRATED INDUCTOR IN ULTRA-SMALL 2X2X0.9MM QFN PACKAGE  
output voltage ripple can be estimated with  
Equation (7):  
N E  
5
VOUT  
V
OUT   
IN  
(7)  
ΔVOUT  
1  
T U O  
T U O  
T U O  
B F  
W S  
W S  
2
8fS L1 C2  
V
VOUT  
For tantalum or electrolytic capacitors, the ESR  
dominates the impedance at the switching  
frequency. For simplification, the output ripple  
can be approximated with Equation (8):  
W S  
N I V  
VOUT  
VOUT  
(8)  
D N G  
ΔVOUT  
1  
RESR  
fS L1  
V
IN  
CIN  
The characteristics of the output capacitor also  
affect the stability of the regulation system.  
Typically, a 10µF output capacitor is sufficient  
to meet most applications. Add a 22μF output  
capacitor to achieve a low output voltage ripple.  
GND  
VIN  
Figure 7: Single-Layer PCB Layout  
N E  
Top Layer  
5
VOUT  
T U O  
T U O  
T U O  
B F  
W S  
W S  
PCB Layout Guidelines  
Efficient PCB layout of the switching power  
supplies is critical for stable operation. For the  
high-frequency switching converter, a poor  
layout design can result in poor line or load  
regulation and stability issues. For best results,  
refer to Figure 7 and Figure 8 and follow the  
guidelines below.  
W S  
N I V  
D N G  
1. Place the high-current paths (GND and IN)  
very close to the device with short, direct,  
and wide traces.  
CIN  
GND  
VIN  
2. Place the input capacitor as close to IN and  
GND as possible.  
Bottom Layer  
3. Place the external feedback resistors next  
to FB (only for the MPM3804GG).  
VOUT  
R2  
FB  
GND  
via  
Figure 8: Double-Layer PCB Layout  
MPM3804 Rev.1.0  
5/2/2018  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2018 MPS. All Rights Reserved.  
14  
MPM3804 0.6A, 5.5V INPUT STEP-DOWN MODULE SYNCHRONOUS  
REGULATOR WITH INTEGRATED INDUCTOR IN ULTRA-SMALL 2X2X0.9MM QFN PACKAGE  
TYPICAL APPLICATION CIRCUITS  
VIN  
VOUT  
2.3V to 5.5V  
1.2V/0.6A  
VIN  
OUT  
C2  
22µF  
C1  
10µF  
R3  
100kΩ  
MPM3804GG  
R1  
200kΩ  
FB  
EN  
EN  
R2  
200kΩ  
GND  
Figure 9: Typical Application Circuit for MPM3804GG  
VIN  
2.3V to 5.5V  
VOUT  
XXV/0.6A  
VIN  
OUT  
C2  
10µF  
C1  
10µF  
R1  
100kΩ  
MPM3804GG-XX  
PG  
EN  
EN  
PG  
R2  
499kΩ  
GND  
Figure 10: Typical Application Circuit for MPM3804GG-XX  
NOTE: VIN > VOUT for application.  
MPM3804 Rev.1.0  
5/2/2018  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2018 MPS. All Rights Reserved.  
15  
MPM3804 0.6A, 5.5V INPUT STEP-DOWN MODULE SYNCHRONOUS  
REGULATOR WITH INTEGRATED INDUCTOR IN ULTRA-SMALL 2X2X0.9MM QFN PACKAGE  
PACKAGE INFORMATION  
QFN-10 (2mmx2mm)  
PIN 1 ID  
0.125X45º TYP  
PIN 1 ID  
MARKING  
PIN 1 ID  
INDEX AREA  
TOP VIEW  
BOTTOM VIEW  
SIDE VIEW  
NOTE:  
0.125X45º  
1) ALL DIMENSIONS ARE IN MILLIMETERS.  
2) EXPOSED PADDLE SIZE DOES NOT  
INCLUDE MOLD FLASH.  
3) LEAD COPLANARITY SHALL BE 0.10  
MILLIMETERS MAX.  
4) JEDEC REFERENCE IS MO-220.  
5) DRAWING IS NOT TO SCALE.  
RECOMMENDED LAND PATTERN  
NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that third  
party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not  
assume any legal responsibility for any said applications.  
MPM3804 Rev.1.0  
5/2/2018  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2018 MPS. All Rights Reserved.  
16  

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