MPM3506AGQV [MPS]
Switching Regulator, Current-mode, 2000kHz Switching Freq-Max, QFN-19;
| 型号： | MPM3506AGQV |
| 厂家： | 
MONOLITHIC POWER SYSTEMS |
| 描述： | Switching Regulator, Current-mode, 2000kHz Switching Freq-Max, QFN-19 开关 输出元件 |
| 文件： | 总22页 (文件大小：1386K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MPM3506A
36V/0.6A Module
Synchronous Step-Down Converter
with Integrated Inductor
DESCRIPTION
FEATURES
The MPM3506A is a synchronous, rectified,
step-down converter with built-in power
MOSFETs, inductor, and two capacitors. It
offers a compact solution with only 4 external
components to achieve a 0.6A continuous
output current with excellent load and line
regulation over a wide input supply range. The
MPM3506A operates in a 1.15MHz switching
frequency, which provides fast load transient
response.
Complete Switch-Mode Power Supply
4.5V to 36V Wide Operating Input Range
0.6A Continuous Load Current
90mΩ/60mΩ Low RDS(ON) Internal Power
MOSFETs
Fixed 1.15MHz Switching Frequency
800kHz-2MHz Frequency Sync
Power-Save Mode for Light Load
Power Good Indicator
OCP with Valley Current Detection and
Hiccup
Thermal Shutdown
Output Adjustable from 0.8V
Available in a QFN-19 (3mmx5mmx1.6mm)
Package
Full protection features include over-current
protection (OCP) and thermal shutdown (TSD).
The MPM3506A eliminates design and
manufacturing
risks
while
dramatically
improving time-to-market.
Total Solution Size 6.7mmx6.3mm
The MPM3506A is available in a space-saving
QFN-19
(3mmx5mmx1.6mm)
package.
APPLICATIONS
Industrial Controls
Automotive
Medical and Imaging Equipment
Telecom Applications
LDO Replacement
Space and Resource-Limited Applications
Distributed Power Systems
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
VOUT
3.3V/0.6A
4.5V-36V
VIN
EN
IN
OUT
MPM3506A
C1
4.7uF
C2
47uF
R1
75k
EN/SYNC
FB
R2
24k
PGND AGND
MPM3506A Rev. 1.0
7/21/2015
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 MPS. All Rights Reserved.
1
MPM3506A – SYNCHRONOUS STEP-DOWN MODULE CONVERTER
ORDERING INFORMATION
Part Number*
Package
Top Marking
QFN-19
(3mmx5mmx1.6mm)
MPM3506AGQV
See Below
* For Tape & Reel, add suffix –Z (eg. MPM3506AGQV –Z)
TOP MARKING
MP: MPS prefix
Y: Year code
W: Week code
3506A: First four digits of the part number
LLL: Lot number
M: Module
PACKAGE REFERENCE
TOP VIEW
EN/
SYNC
PG
17
VIN
15
NC
14
PGND
13
16
FB
VCC
AGND
SW
1
12 PGND
BST
NC
11
10
2
3
4
19
NC
18
NC
OUT
9
8
SW
OUT
OUT
5
6
SW
7
All “NC” pins
must be left floating.
MPM3506A Rev. 1.0
7/21/2015
www.MonolithicPower.com
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© 2015 MPS. All Rights Reserved.
2
MPM3506A – SYNCHRONOUS STEP-DOWN MODULE CONVERTER
ABSOLUTE MAXIMUM RATINGS (1)
VIN ................................................ -0.3V to 40V
VSW ....................................................................
-0.3V (-5V for <10ns) to VIN + 0.3V (43V for
<10ns)
Thermal Resistance (5)
QFN-19 (3mmx5mmx1.6mm). 46...... 10... °C/W
θJA θJC
NOTES:
1) Absolute maximum ratings are rated under room temperature
unless otherwise noted. Exceeding these ratings may
damage the device.
2) Please refer to the “ENABLE/SYNC” section on page 12 for
the absolute maximum rating of EN/SYNC.
3) 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 will produce an excessive die temperature,
causing the regulator to go into thermal shutdown. Internal
thermal shutdown circuitry protects the device from
permanent damage.
VBST .....................................................VSW + 6V
(2)
All other pins................................-0.3V to 6V
(3)
Continuous power dissipation (TA = +25°C)
............................................................2.7W
Junction temperature...............................150°C
Lead temperature ....................................260°C
Storage temperature..................-65°C to 150°C
Recommended Operating Conditions (4)
Supply voltage (VIN) ........................ 4.5V to 36V
Output voltage (VOUT)..............0.81V to VIN*DMax
Operating junction temp. (TJ). ..-40°C to +125°C
4) The device is not guaranteed to function outside of its
operating conditions.
5) Measured on JESD51-7, 4-layer PCB.
MPM3506A Rev. 1.0
7/21/2015
www.MonolithicPower.com
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© 2015 MPS. All Rights Reserved.
3
MPM3506A – SYNCHRONOUS STEP-DOWN MODULE CONVERTER
ELECTRICAL CHARACTERISTICS
VIN = 24V, TJ = -40°C to +125°C(6), unless otherwise noted. Typical values are at TJ = +25°C.
Parameter
Symbol Condition
Min
Typ
Max
8
Units
μA
mA
mΩ
mΩ
mΩ
μA
Supply current (shutdown)
Supply current (quiescent)
HS switch-on resistance
LS switch-on resistance
Inductor DC resistance
Switch leakage
IIN
Iq
VEN = 0V
VFB = 1V
0.58
90
0.8
165
115
HSRDS-ON VBST-SW = 5V
LSRDS-ON VCC = 5V
LDCR
60
75
SWLKG
VEN = 0V, VSW = 24V
1
High-side peak current limit IPEAK_LIMIT 20% duty cycle
Low-side valley current limit IVALLEY_LIMIT Vout short to GND
2
4
A
1.3
A
Oscillator frequency
fSW
VFB = 700mV
VFB = 700mV
800
89
1150
1500
kHz
Maximum duty cycle
Minimum on time(7)
DMAX
92
50
%
ns
τON_MIN
TJ = 25°C
798
790
810
822
830
100
mV
mV
nA
Feedback voltage
VFB
TJ = -40°C to +125°C
VFB = 850mV
Feedback current
EN rising threshold
IFB
10
VEN_RISING
1.1
1.45
1.8
1.65
7
V
V
EN falling threshold
EN input current
VEN_FALLING
IEN
0.95
1.3
4
VEN = 2V
μA
μs
kHz
EN turn-off delay(7)
ENTd-off
fSYNC
3
SYNC frequency range
800
2000
4.35
VIN under-voltage lockout
threshold—rising
INUVVth
3.75
4.05
400
V
VIN under-voltage lockout
threshold—hysteresis
INUVHYS
mV
PG rising threshold
PG falling threshold
PG rising delay
PGVth-Hi
PGVth-Lo
PGTd_Rising
PGTd_Falling
VPG
84%
79%
30
87.5%
82.5%
90
91%
86%
160
95
VFB
VFB
μs
μs
V
PG falling delay
25
55
PG sink current capability
PG leakage current
VCC regulator
Sink 4mA
0.4
100
5.2
4
IPG-LEAK
VCC
nA
V
4.6
0.5
4.9
1.5
VCC load regulation
Soft-start time
Thermal shutdown (7)
Thermal hysteresis (7)
NOTES:
ICC = 5mA
%
tSS
VOUT from 10% to 90%
1.45
165
20
2.5
ms
°C
°C
6) Not tested in production and guaranteed by over-temperature correlation.
7) Derived from characterization test. Not tested in production.
MPM3506A Rev. 1.0
7/21/2015
www.MonolithicPower.com
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© 2015 MPS. All Rights Reserved.
4
MPM3506A – SYNCHRONOUS STEP-DOWN MODULE CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
Typical performance characteristic waveforms are captured from the evaluation board.
VIN = 24V, VOUT = 3.3V, TA = 25°C, unless otherwise noted.
MPM3506A Rev. 1.0
7/21/2015
www.MonolithicPower.com
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© 2015 MPS. All Rights Reserved.
5
MPM3506A – SYNCHRONOUS STEP-DOWN MODULE CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Typical performance characteristic waveforms are captured from the evaluation board.
VIN = 24V, VOUT = 3.3V, TA = 25°C, unless otherwise noted.
MPM3506A Rev. 1.0
7/21/2015
www.MonolithicPower.com
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© 2015 MPS. All Rights Reserved.
6
MPM3506A – SYNCHRONOUS STEP-DOWN MODULE CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Typical performance characteristic waveforms are captured from the evaluation board.
VIN = 24V, VOUT = 3.3V, TA = 25°C, unless otherwise noted.
MPM3506A Rev. 1.0
7/21/2015
www.MonolithicPower.com
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© 2015 MPS. All Rights Reserved.
7
MPM3506A – SYNCHRONOUS STEP-DOWN MODULE CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Typical performance characteristic waveforms are captured from the evaluation board.
VIN = 24V, VOUT = 3.3V, TA = 25°C, unless otherwise noted.
MPM3506A Rev. 1.0
7/21/2015
www.MonolithicPower.com
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© 2015 MPS. All Rights Reserved.
8
MPM3506A – SYNCHRONOUS STEP-DOWN MODULE CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Typical performance characteristic waveforms are captured from the evaluation board.
VIN = 24V, VOUT = 3.3V, TA = 25°C, unless otherwise noted.
MPM3506A Rev. 1.0
7/21/2015
www.MonolithicPower.com
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© 2015 MPS. All Rights Reserved.
9
MPM3506A – SYNCHRONOUS STEP-DOWN MODULE CONVERTER
PIN FUNCTIONS
Package
Pin #
Name
Description
Feedback. Connect FB to the tap of an external resistor divider from the output to
AGND to set the output voltage. The frequency foldback comparator lowers the
oscillator frequency (when the FB voltage is below 400mV) to prevent current-limit
runaway during a short-circuit fault. Place the resistor divider as close to FB as
possible. Avoid placing vias on the FB traces.
1
FB
Internal 5V LDO output. The internal circuit integrates an LDO output capacitor, so
an external capacitor is NOT necessary.
2
3
VCC
Analog ground. AGND is the reference ground of the logic circuit. AGND is
connected internally to PGND.
AGND
Switch output. No connection is needed for the SW pins, but a large copper plane is
recommended on pins 4, 5, and 6 for improved heat sink.
4, 5, 6
7, 8, 9
SW
OUT
NC
Power output. Connect the load to OUT; an output capacitor is needed.
10, 14, 18,
19
No connection. Do NOT connect; NC must be left floating.
Bootstrap. A bootstrap capacitor is integrated internally, so an external connection is
NOT necessary.
11
BST
Power ground. PGND is the reference ground of the power device. PCB layout
requires extra care (please see recommended “PCB Layout Guidelines” on page 16.
For best results, connect to PGND with copper and vias.
12, 13,
PGND
Supply voltage. VIN supplies power for the internal MOSFET and regulator. The
MPM3506A operates from a +4.5V to +36V input rail. VIN requires a low ESR and
low inductance capacitor to decouple the input rail. Place the input capacitor very
close to VIN and connect it with wide PCB traces and multiple vias.
15
VIN
Enable/Synchronize. EN/SYNC = high to enable the module. Floating EN/SYNC or
16
17
EN/SYNC connecting it to ground will disable the converter. Apply an external clock to
EN/SYNC to change the switching frequency.
PG
Power good indicator. PG is an open-drain structure.
MPM3506A Rev. 1.0
7/21/2015
www.MonolithicPower.com
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10
MPM3506A – SYNCHRONOUS STEP-DOWN MODULE CONVERTER
FUNCTIONAL BLOCK DIAGRAM
VIN
Current-Sense
Amplifier
EN/SYNC
OUT
Comparator
On-Time Control
Logic Control
Current-Limit
Comparator
10k
PGND
AGND
PG
Figure 1: Functional Block Diagram
MPM3506A Rev. 1.0
7/21/2015
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MPM3506A – SYNCHRONOUS STEP-DOWN MODULE CONVERTER
OPERATION
.
The
MPM3506A
is
a
high-frequency,
4
synchronous, rectified, step-down, switch-mode
converter with built-in power MOSFETs,
inductor, and two capacitors. It offers a very
compact solution that achieves
a
0.6A
continuous output current with excellent load
and line regulation over a 4.5V to 36V input
supply range.
Figure 2: Simplified AAM Control Logic
Error Amplifier (EA)
The error amplifier compares the FB voltage to
the internal 0.81V reference (VREF) and outputs
a current proportional to the difference between
the two. This output current then charges or
discharges the internal compensation network
to form the COMP voltage (which controls the
power MOSFET current). The optimized
internal compensation network minimizes the
external component count and simplifies the
control loop design.
The MPM3506A operates in a fixed-frequency,
peak-current–control mode to regulate the
output voltage. An internal clock initiates a
PWM cycle. The integrated high-side power
MOSFET (HS-FET) turns on and remains on
until the current reaches the value set by the
COMP voltage. When the power switch is off, it
remains off until the next clock cycle starts. If
the current in the HS-FET does not reach the
value set by the COMP value within 92% of one
PWM period, the HS-FET is forced off.
Under-Voltage Lockout (UVLO)
Internal Regulator
Under-voltage lockout (UVLO) protects the chip
from operating at an insufficient supply voltage.
The MPM3506A UVLO comparator monitors
the output voltage of the internal regulator
(VCC). The UVLO rising threshold is about
4.05V while its falling threshold is 3.65V.
A 5V internal regulator powers most of the
internal circuitries. This regulator takes VIN and
operates in the full VIN range. When VIN
exceeds 5.0V, the output of the regulator is in
full regulation. When VIN is less than 5.0V, the
output will decrease. The part integrates an
internal decoupling capacitor, so an external
VCC output capacitor is NOT necessary.
EN/SYNC
EN/SYNC is a digital control pin that turns the
regulator on and off. Drive EN/SYNC high to
turn on the regulator; drive EN/SYNC low to
turn off the regulator. An internal 1MΩ resistor
from EN/SYNC to GND allows EN/SYNC to be
floated to shut down the chip.
AAM Operation
The MPM3506A has advanced asynchronous
modulation (AAM) power-save mode for light
load. AAM voltage (VAAM) is fixed internally. The
internal 250mV AAM voltage sets the transition
point from AAM to PWM. Under a heavy-load
condition, the VCOMP is higher than VAAM. When
the clock goes high, the HS-FET turns on and
remains on until VILsense reaches the value set
by the COMP voltage. The internal clock re-sets
EN/SYNC is clamped internally using a 6.5V
series Zener diode (see Figure 3). Connecting
the EN/SYNC input through a pull-up resistor to
the voltage on VIN limits the EN/SYNC input
current to less than 100µA.
For example, with 12V connected to VIN,
every time VCOMP is higher than VAAM
.
RPULLUP ≥ (12V – 6.5V) ÷ 100µA = 55kΩ.
Under a light-load condition, the value of VCOMP
is low. When VCOMP is less than VAAM and VFB is
less than VREF, VCOMP ramps up until it exceeds
VAAM. At this time, the internal clock is blocked,
causing the MPM3506A to skip pulses for pulse
frequency modulation (PFM) mode, achieving
the light-load power save (see Figure 2).
Connecting EN/SYNC directly to a voltage
source without a pull-up resistor requires
limiting the amplitude of the voltage source to
≤6V to prevent damage to the Zener diode.
MPM3506A Rev. 1.0
7/21/2015
www.MonolithicPower.com
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12
MPM3506A – SYNCHRONOUS STEP-DOWN MODULE CONVERTER
the average short-circuit current to alleviate
thermal issues and protect the regulator. The
MPM3506A exits hiccup mode once the over-
current condition is removed.
Thermal Shutdown (TSD)
Figure 3: 6.5V Zener Diode Connection
Connect an external clock with a range of
800kHz to 2MHz to synchronize the internal
clock rising edge to the external clock rising
edge. The pulse width of the external clock
signal should be less than 700ns.
Thermal shutdown prevents the chip from
operating at exceedingly high temperatures.
When the die temperature exceeds 165°C, the
device stops switching. When the temperature
drops below its lower threshold (145°C,
typically) the power supply resumes operation.
Internal Soft Start (SS)
Floating Driver and Bootstrap Charging
The soft start prevents the converter output
voltage from overshooting during start-up.
When the chip starts up, the internal circuitry
generates a soft-start voltage (SS) that ramps
An internal bootstrap capacitor powers the
floating power MOSFET driver. A dedicated
internal regulator (see Figure 4) charges and
regulates the bootstrap capacitor voltage to ~5V.
When the voltage between the BST and SW
nodes drops below regulation, a PMOS pass
transistor connected from VIN to BST turns on.
The charging current path is from VIN, BST, and
then to SW. The external circuit should provide
enough voltage headroom to facilitate charging.
As long as VIN is significantly higher than SW,
the bootstrap capacitor remains charged. When
the HS-FET is on (VIN≈VSW), the bootstrap
capacitor cannot charge. When the LS-FET is
on, VIN–VSW reaches its maximum value for fast
charging. When there is no inductor current
(VSW = VOUT), the difference between VIN and
VOUT can charge the bootstrap capacitor. The
floating driver has its own UVLO protection,
with a rising threshold of 2.2V and a hysteresis
of 150mV.
up from 0V to 5V. When SS is lower than VREF
,
the error amplifier uses SS as the reference.
When SS is higher than VREF, the error amplifier
uses VREF as the reference. The SS time is set
internally to 1.3ms.
Over-Current Protection and Hiccup
The MPM3506A has cycle-by-cycle peak
current limit protection and valley-current
detection protection. The inductor current is
monitored during the HS-FET on state. If the
inductor current exceeds the current limit value
set by the COMP high-clamp voltage, the HS-
FET turns off immediately. Then the low-side
MOSFET (LS-FET) turns on to discharge the
energy, and the inductor current decreases.
The HS-FET remains off unless the inductor
valley current is lower than a certain current
threshold (the valley current limit), even though
the internal CLK pulses high. If the inductor
current doesn’t drop below the valley current
limit when the CLK pulses high, the HS-FET will
miss the CLK, and the switching frequency will
decrease to half the nominal value. Both the
peak and valley current limits assist in keeping
the inductor current from running away during
an over-load or short-circuit condition.
If the output voltage drops below the under-
voltage (UV) threshold, 50% below the
reference, typically the MPM3506A enters
hiccup mode to re-start the part periodically
(simultaneously the peak current limit is kicked).
This protection mode is useful when the output
is dead shorted to ground and greatly reduces
Figure 4: Internal Bootstrap Charging Circuit
MPM3506A Rev. 1.0
7/21/2015
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MPM3506A – SYNCHRONOUS STEP-DOWN MODULE CONVERTER
Start-Up and Shutdown
If VIN exceeds its thresholds, the chip starts up.
The reference block starts first, generating
stable reference voltage and currents; then the
internal regulator is enabled. The regulator
provides a stable supply for the remaining
circuitries.
Three events can shut down the chip: VIN low,
EN low, and thermal shutdown. During the
shutdown procedure, the signaling path is
blocked first to avoid any fault triggering. The
COMP voltage and the internal supply rail are
then pulled down. The floating driver is not
subject to this shutdown command.
MPM3506A Rev. 1.0
7/21/2015
www.MonolithicPower.com
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© 2015 MPS. All Rights Reserved.
14
MPM3506A – SYNCHRONOUS STEP-DOWN MODULE CONVERTER
APPLICATION INFORMATION
Setting the Output Voltage
Since C1 absorbs the input switching current, it
requires an adequate ripple current rating. The
RMS current in the input capacitor can be
estimated with Equation (2) and Equation (3):
The external resistor divider sets the output
voltage (see “Typical Application” on page 1).
Also, the feedback resistor (R1) sets the
feedback loop bandwidth with the internal
VOUT
VOUT
compensation
capacitor
(see
“Typical
IC1 ILOAD
1
(2)
=
V
V
IN
IN
Application” on page 1). Choose R1 around
75kΩ when VOUT 1V. R2 is then given using
Equation (1):
The worse-case condition occurs at VIN
2VOUT, where:
R1
ILOAD
R2
IC1
(3)
(1)
2
V
OUT
1
For simplification, choose an input capacitor
with an RMS current rating greater than half of
the maximum load current.
0.81V
C3
FB
The input capacitor can be electrolytic,
tantalum, or ceramic. When using electrolytic or
tantalum capacitors, add a small, high-quality
ceramic capacitor (e.g. 0.1μF) placed as close
to the IC as possible. When using ceramic
capacitors, ensure that they have enough
capacitance to provide sufficient charge in order
to prevent excessive voltage ripple at the input.
The input voltage ripple caused by capacitance
can be estimated with Equation (4):
Vout
R1
R2
Figure 5: Feedback Network
See Figure 5 for the feedback network and
Table 1 for a list of the recommended resistor
values for common output voltages.
Table 1: Resistor Selection for Common Output
Voltages
ILOAD
VOUT
VOUT
(4)
V
1
IN
fS C1
VIN
V
IN
VOUT (V)
R1 (kΩ)
R2 (kΩ)
C3(pF)
Selecting the Output Capacitor
1.0
1.2
1.5
1.8
2.5
3.3
5
75
75
75
75
75
75
75
300
150
91
33
33
22
22
22
22
22
The output capacitor (C2) maintains the DC
output voltage. Use ceramic, tantalum, or low
ESR electrolytic capacitors. For best results,
use low ESR capacitors to keep the output
voltage ripple low. The output voltage ripple can
be estimated with Equation (5):
62
36
24
VOUT
VOUT
1
14.3
(5)
VOUT
1
R
ESR
fS L1
V
8 fS C2
IN
Selecting the Input Capacitor
The input current to the step-down converter is
discontinuous, therefore it requires a capacitor
to supply the AC current while maintaining the
DC input voltage. Use low ESR capacitors for
the best performance. Use ceramic capacitors
with X5R or X7R dielectrics for best results
because of their low ESR and small
temperature coefficients. For most applications,
use a 4.7µF capacitor.
Where L1 is the inductor value and RESR is the
equivalent series resistance (ESR) value of the
output capacitor.
For ceramic capacitors, the capacitance
dominates the impedance at the switching
frequency, and the capacitance causes the
majority of the output voltage ripple. For
MPM3506A Rev. 1.0
7/21/2015
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MPM3506A – SYNCHRONOUS STEP-DOWN MODULE CONVERTER
2. Ensure the high-current paths at GND and
VIN have short, direct, and wide traces.
simplification, the output voltage ripple can be
estimated with Equation (6):
3. Place the ceramic input capacitor close to
VIN and PGND.
VOUT
8 fS2 L1 C2
VOUT
(6)
ΔVOUT
1
V
IN
4. Keep the connection of the input capacitor
and VIN as short and wide as possible.
For tantalum or electrolytic capacitors, the ESR
dominates the impedance at the switching
frequency. For simplification, the output ripple
can be approximated with Equation (7):
5. Place the external feedback resistors next
to FB.
6. Keep the feedback network away from the
VOUT
VOUT
(7)
ΔVOUT
1
RESR
switching node.
fS L1
VIN
NOTE:
8) The recommended layout is based on Figure 8 and the
The characteristics of the output capacitor
affect the stability of the regulation system. The
MPM3506A can be optimized for a wide range
of capacitance and ESR values.
“Typical Application Circuits” on page 18.
VIN
GND
VOUT
External Bootstrap Diode
An external bootstrap diode can enhance the
efficiency of the regulator given the following
conditions:
C1
VOUT is 5V or 3.3V;
PGND
FB
VOUT
VCC
BST
the duty cycle is high: D=
>65%
AGND
SW
VIN
NC
In these cases, add an external BST diode from
VCC to BST (see Figure 6).
OUT
6.3mm
Top Layer
MPM3506A
OUT
GND
Figure 6: Optional External Bootstrap Diode to
Enhance Efficiency
VOUT
The recommended external BST diode is
IN4148.
PCB Layout Guidelines(8)
Efficient PCB layout is critical to achieve stable
operation, especially for input capacitor
placement. For best results, refer to Figure 7
and follow the guidelines below:
1. Use a large ground plane connected
directly to PGND. If the bottom layer is
ground plane, add vias near PGND.
Bottom Layer
Figure 7: Recommended PCB Layout
MPM3506A Rev. 1.0
7/21/2015
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16
MPM3506A – SYNCHRONOUS STEP-DOWN MODULE CONVERTER
Design Example
Table 2 is a design example following the
application guidelines for the specifications
below:
Table 2: Design Example
VIN
VOUT
Io
24V
3.3V
0.6A
The detailed application schematic is shown in
Figure 8. The typical performance and circuit
waveforms have been shown in the “Typical
Performance Characteristics” section. For more
device applications, please refer to the related
evaluation board datasheets.
MPM3506A Rev. 1.0
7/21/2015
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17
MPM3506A – SYNCHRONOUS STEP-DOWN MODULE CONVERTER
TYPICAL APPLICATION CIRCUITS
BST
SW
VOUT
5V/0.6A
Continuous:4.5V-36V
VIN
IN
OUT
M3506A
MP
C1
4.7µF
R3
1M
C3
C2
R1
75k
22pF 47µF
EN/ SYNC
VCC
EN
PG
FB
R4
100k
R2
14.3k
PG
PGND
AGND
Figure 8: VOUT = 5V, IOUT = 0.6A
BST
VOUT
SW
3.3V/0.6A
Continuous:4.5V-36V
VIN
IN
OUT
C1
4.7µF
R3
1M
MPM3506A
C3
C2
R1
75k
22pF 47µF
EN/ SYNC
VCC
EN
PG
FB
R4
100k
R2
24k
PG
PGND
AGND
Figure 9: VOUT = 3.3V, IOUT = 0.6A
MPM3506A Rev. 1.0
7/21/2015
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18
MPM3506A – SYNCHRONOUS STEP-DOWN MODULE CONVERTER
BST
VOUT
SW
2.5V/0.6A
Continuous:4.5V-36V
VIN
IN
OUT
MPM3506A
C1
4.7µF
R3
1M
C3
C2
R1
75k
22pF 47µF
EN/ SYNC
VCC
EN
PG
FB
R4
100k
R2
36k
PG
PGND
AGND
Figure 10: VOUT = 2.5V, IOUT = 0.6A
BST
SW
VOUT
Continuous:4.5V-32V
Transient: 36V
1.8V/0.6A
VIN
IN
OUT
MPM3506A
C1
R3
1M
4.7µF
C3
C2
R1
75k
22pF 47µF
EN/ SYNC
VCC
EN
PG
FB
R4
100k
R2
62k
PG
PGND
AGND
Figure 11: VOUT = 1.8V, IOUT = 0.6A
MPM3506A Rev. 1.0
7/21/2015
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19
MPM3506A – SYNCHRONOUS STEP-DOWN MODULE CONVERTER
BST
VOUT
SW
Continuous:4.5V-30V
Transient: 36V
1.5V/0.6A
VIN
IN
OUT
MPM3506A
C1
R3
1M
4.7µF
C3
C2
R1
75k
22pF 47µF
EN/ SYNC
VCC
EN
PG
FB
R4
100k
R2
91k
PG
PGND
AGND
Figure 12: VOUT = 1.5V, IOUT = 0.6A
BST
SW
VOUT
Continuous:4.5V-24V
Transient: 36V
1.2V/0.6A
VIN
IN
OUT
MPM3506A
C1
R3
1M
4.7µF
C3
C2
R1
75k
33pF 47µF
EN/ SYNC
VCC
EN
PG
FB
R4
100k
R2
150k
PG
PGND
AGND
Figure 13: VOUT = 1.2V, IOUT = 0.6A
MPM3506A Rev. 1.0
7/21/2015
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20
MPM3506A – SYNCHRONOUS STEP-DOWN MODULE CONVERTER
BST
VOUT
SW
Continuous:4.5V-20V
Transient: 36V
1V/0.6A
VIN
IN
OUT
MPM3506A
C1
R3
1M
4.7µF
C3
C2
R1
75k
33pF 47µF
EN/ SYNC
VCC
EN
PG
FB
R4
100k
R2
300k
PG
PGND
AGND
Figure 14: VOUT = 1V, IOUT = 0.6A
MPM3506A Rev. 1.0
7/21/2015
www.MonolithicPower.com
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© 2015 MPS. All Rights Reserved.
21
MPM3506A – SYNCHRONOUS STEP-DOWN MODULE CONVERTER
PACKAGE INFORMATION
QFN-19 (3mmx5mmx1.6mm)
PIN 1 ID
0.15X45º TYP
PIN 1 ID
MARKING
NOTE 2
PIN 1 ID
INDEX AREA
TOP VIEW
BOTTOM VIEW
SIDE VIEW
0.15X45º
NOTE 2
NOTE:
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) SHADED AREA IS THE KEEP-OUT ZONE. ANY PCB
METAL TRACE AND VIA ARE NOT ALLOWED TO
CONNECT TO THIS AREA ELECTRICALLY OR
MECHANICALLY.
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.
MPM3506A Rev. 1.0
7/21/2015
www.MonolithicPower.com
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© 2015 MPS. All Rights Reserved.
22
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