MP2318GJ-Z [MPS]
Switching Regulator, Current-mode, 2000kHz Switching Freq-Max, PDSO8, MO-193BA, TSOT-23, 8 PIN;
| 型号： | MP2318GJ-Z |
| 厂家： | 
MONOLITHIC POWER SYSTEMS |
| 描述： | Switching Regulator, Current-mode, 2000kHz Switching Freq-Max, PDSO8, MO-193BA, TSOT-23, 8 PIN 开关 光电二极管 输出元件 |
| 文件： | 总18页 (文件大小：1074K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MP2318
High Efficiency 2A, 24V, 2MHz
Synchronous Step-Down Converter
DESCRIPTION
FEATURES
The MP2318 is a high frequency synchronous
rectified step-down switch mode converter with
built-in internal power MOSFETs. It offers a
very compact solution to achieve 2A continuous
output current over a wide input supply range
with excellent load and line regulation.
•
•
•
Wide 4.5V to 24V Operating Input Range
2A Load Current
90mΩ/40mΩ Low Rds(on) Internal Power
MOSFETs
Low Quiescent Current
High Efficiency Synchronous Mode
Operation
Fixed 2MHz Switching Frequency
AAM Power Save Mode
Internal Soft Start
OCP Protection and Hiccup
Thermal Shutdown
•
•
Current mode operation provides fast transient
response and eases loop stabilization.
•
•
•
•
•
•
•
Full protection features include OCP and
thermal shut down.
The MP2318 requires a minimum number of
readily available standard external components
and is available in a space saving 8-pin
TSOT23 package.
Output Adjustable from 0.8V
Available in an 8-pin TSOT-23 package
APPLICATIONS
•
•
•
Notebook Systems and I/O Power
Digital Set Top Boxes
Flat Panel Television and Monitors
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
R5
4.5V- 24V
20
VIN
EN/
IN
BST
SW
C5
0.1µF
C1
22 µF
MP2318
VOUT
L1
1uH
V/2A
3.3
EN
C2
22µF
R1
20k
VCC
FB
C4
0.1µF
R2
AAM
GND
4
6.34k
R3
40.2k
MP2318 Rev. 1.0
3/2/2014
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MP2318 – 24V, 2A SYNC STEP-DOWN CONVERTER
ORDERING INFORMATION
Part Number*
Package
Top Marking
MP2318GJ
TSOT23-8
AHG
* For Tape & Reel, add suffix –Z (e.g. MP2318GJ-Z);
PACKAGE REFERENCE
TSOT23-8
ABSOLUTE MAXIMUM RATINGS (1)
VIN............................................... –0.3V to +28V
Thermal Resistance (5)
TSOT23-8…………………...…….100…..55..°C/W
θJA θJC
V
SW .......–0.3V (-5V<10ns) to +28V (30V <10ns)
Notes:
VBST ...................................................... VSW+6V
1) Exceeding these ratings may damage the device.
2) About the details of EN pin’s ABS MAX rating, please refer to
Page 10, EN control section.
(2)
All Other Pins ............................ -0.3V to +6V
(3)
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 cause excessive die temperature, and the
regulator will go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
Continuous Power Dissipation (TA=+25°C) ...
................................................................1.25W
Junction Temperature..............................150°C
Lead Temperature ...................................260°C
Storage Temperature.................-65°C to 150°C
Recommended Operating Conditions (4)
Supply Voltage VIN .............................4.5 to 24V
Output Voltage VOUT............... 0.8V 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.
MP2318 Rev. 1.0
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MP2318 – 24V, 2A SYNC STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS
VIN = 12V, TA = 25°C, unless otherwise noted.
Parameter
Symbol Condition
Min
Typ
Max
Units
Supply Current (Shutdown)
IIN
VEN = 0V
1
μA
VEN = 2V, VFB = 1V, AAM=0.5V
VEN = 2V, VFB = 1V, AAM=5V
0.2
0.7
90
Supply Current (Quiescent)
Iq
mA
HS Switch On Resistance
LS Switch On Resistance
Switch Leakage
HSRDS-ON VBST-SW=5V
LSRDS-ON VCC=5V
mΩ
mΩ
μA
A
40
SWLKG VEN = 0V, VSW =12V
1
Current Limit
ILIMIT
fSW
Duty Cycle=40%
VFB=750mV
3.6
4.6
2000
0.3
83
Oscillator Frequency
Fold-back Frequency
Maximum Duty Cycle
Minimum On Time (6)
Feedback Voltage
Feedback Current
EN Rising Threshold
EN Hysteresis
1700
2400
kHz
fSW
%
fFB
VFB<400mV
DMAX
TON MIN
VFB
VFB=700mV
78
35
ns
TA=25ºC
786
798
10
810
50
mV
nA
V
IFB
VFB=820mV
VEN RISING
VEN HYS
1.2
80
1.4
150
1.6
220
mV
VEN=2V
VEN=0
2
0
μA
EN Input Current
IEN
nA
VIN Under Voltage Lockout
Threshold-Rising
INUVVth
3.7
3.9
4.1
V
VIN Under Voltage Lockout
Threshold-Hysteresis
INUVHYS
VCC
650
mV
VCC Regulator
4.9
1.5
1.5
150
20
V
VCC Load Regulation
Soft-Start Period
Thermal Shutdown(6)
Thermal Hysteresis(6)
AAM Source Current
ICC=5mA
%
TSS
VOUT from 10% to 90%
0.8
5.6
2.2
6.8
ms
ºC
ºC
μA
IAAM
6.2
Notes:
6) Guaranteed by design
MP2318 Rev. 1.0
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MP2318 – 24V, 2A SYNC STEP-DOWN CONVERTER
TYPICAL CHARACTERISTICS
VIN = 19V, VOUT = 3.3V, L=1μH, TA = 25°C, unless otherwise noted.
MP2318 Rev. 1.0
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MP2318 – 24V, 2A SYNC STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 19V, VOUT = 3.3V, L = 1uH, TA = 25°C, unless otherwise noted.
MP2318 Rev. 1.0
3/2/2014
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MP2318 – 24V, 2A SYNC STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 19V, VOUT = 3.3V, L = 1uH, TA = 25°C, unless otherwise noted.
MP2318 Rev. 1.0
3/2/2014
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MP2318 – 24V, 2A SYNC STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 19V, VOUT = 3.3V, L = 1uH, TA = 25°C, unless otherwise noted.
MP2318 Rev. 1.0
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MP2318 – 24V, 2A SYNC STEP-DOWN CONVERTER
PIN FUNCTIONS
Package
Pin #
Name Description
A resistor is connected from AAM pin to ground to set a AAM voltage force MP2318 into
non-synchronous mode when load is small. Drive AAM pin high (=VCC) or float AAM pin
will force MP2318 into CCM.
1
AAM
Supply Voltage. The MP2318 operates from a +4.5V to +24V input rail. C1 is needed to
decouple the input rail. Use wide PCB trace to make the connection.
2
3
IN
SW
Switch Output. Use wide PCB trace to make the connection.
System Ground. This pin is the reference ground of the regulated output voltage.
For this reason care must be taken in PCB layout. Suggested to be connected to GND with
copper and vias.
4
GND
Bootstrap. A capacitor and a 20Ω resistor connected between SW and BST pins are
required to form a floating supply across the high-side switch driver.
5
6
7
BST
EN
EN=1 to enable the MP2318.
Bias Supply. Decouple with 0.1μF-0.22μF cap. And the capacitance should be no more
than 0.22μF
VCC
Feedback. An external resistor divider from the output to GND, tapped to the FB pin, sets
the output voltage. To prevent current limit run away during a short circuit fault condition
the frequency fold-back comparator lowers the oscillator frequency when the FB voltage is
below 400mV.
8
FB
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MP2318 – 24V, 2A SYNC STEP-DOWN CONVERTER
FUNCTION BLOCK DIAGRAM
Figure 1: Functional Block Diagram
MP2318 Rev. 1.0
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MP2318 – 24V, 2A SYNC STEP-DOWN CONVERTER
Under the 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. During this time, the internal
clock is blocked, thus the MP2318 skips some
pulses for PFM (Pulse Frequency Modulation)
mode and achieves the light load power save.
OPERATION
The MP2318 is a high frequency synchronous
rectified step-down switch mode converter with
built in internal power MOSFETs. It offers a
very compact solution to achieve 2A continuous
output current over a wide input supply range
with excellent load and line regulation.
The MP2318 operates in a fixed frequency,
peak current control mode to regulate the
output voltage. A PWM cycle is initiated by the
internal clock. The integrated high-side power
MOSFET is turned on and remains on until its
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, in
83% of one PWM period, the current in the
power MOSFET does not reach the COMP set
current value, the power MOSFET will be
forced to turn off.
.
56
260
Figure 2: Simplified AAM Control Logic
Enable control
EN is a digital control pin that turns the
regulator on and off. Drive EN high to turn on
the regulator, drive it low to turn it off. There is
an internal 1MEG resistor from EN to GND thus
EN can be floated to shut down the chip. Also
EN pin voltage was clamped to around 6.5V by
an internal zener-diode. Please use large
enough pull up resistor connecting between VIN
and EN to limit the EN input current which
should be less than 100uA. Generally, around
100k resistor should be large enough for all the
applications.
Internal Regulator
Most of the internal circuitries are powered from
the 5V internal regulator. This regulator takes
the VIN input and operates in the full VIN range.
When VIN is greater than 5.0V, the output of
the regulator is in full regulation. When VIN is
lower than 5.0V, the output decreases, a 0.1uF
ceramic capacitor for decoupling purpose is
required.
For example, with 12V connected to Vin,
R
PULLUP ≥ (12V – 6.5V) ÷ 100µA = 55kΩ.
Error Amplifier
The error amplifier compares the FB pin voltage
with the internal 0.8V reference (REF) and
outputs a COMP voltage, which is used to
control the power MOSFET current. The
optimized internal compensation network
minimizes the external component counts and
simplifies the control loop design.
Connecting the EN pin is directly to a voltage
source without any pullup resistor requires
limiting the amplitude of the voltage source to
≤6V to prevent damage to the Zener diode.
AAM Operation
The
MP2318
has
AAM
(Advanced
Asynchronous Modulation) power-save mode
for light load. Connect a resistor from AAM pin
to GND to set AAM voltage. Under the heavy
load condition, the VCOMP is higher than VAAM
.
When the clock goes high, the high-side power
MOSFET turns on and remains on until VILsense
reaches the value set by the COMP voltage.
The internal clock resets every time when VCOMP
is higher than VAAM
.
MP2318 Rev. 1.0
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MP2318 – 24V, 2A SYNC STEP-DOWN CONVERTER
temperatures. When the silicon die temperature
is higher than 150°C, it shuts down the whole
chip. When the temperature is lower than its
lower threshold, typically 130°C, the chip is
enabled again.
Figure 3: 6.5V Zener Diode Connection
Floating Driver and Bootstrap Charging
The floating power MOSFET driver is powered
by an external bootstrap capacitor. This floating
driver has its own UVLO protection. This
UVLO’s rising threshold is 2.2V with a
hysteresis of 150mV. The bootstrap capacitor
voltage is regulated internally by VIN through
D1, R5, C5, L1 and C2 (Figure 4). If (VIN-VSW)
is more than 5V, U2 will regulate M3 to maintain
a 5V BST voltage across C5.
Under-Voltage Lockout (UVLO)
Under-voltage lockout (UVLO) is implemented
to protect the chip from operating at insufficient
supply voltage. The MP2318 UVLO comparator
monitors the output voltage of the internal
regulator, VCC. The UVLO rising threshold is
about 3.9V while its falling threshold is
consistent 3.25V.
Internal Soft-Start
The soft start is implemented to prevent the
converter output voltage from overshooting
during start up. When the chip starts, the
internal circuitry generates a soft-start voltage
(SS) ramping up from 0V. The soft-start period
lasts until the voltage on the soft-start capacitor
exceeds the reference voltage of 0.8V. At this
point the reference voltage takes over. The soft-
start time is internally set to be around 1.5ms.
R5
5
Over-Current-Protection and Hiccup
Figure 4: Internal Bootstrap Charging Circuit
Startup and Shutdown
The MP2318 has cycle-by-cycle over current
limit when the inductor current peak value
exceeds the set current limit threshold.
Meanwhile, output voltage starts to drop until
FB is below the Under-Voltage (UV) threshold,
typically 50% below the reference. Once a UV
is triggered, the MP2318 enters hiccup mode to
periodically restart the part. This protection
mode is especially useful when the output is
dead-short to ground. The average short circuit
current is greatly reduced to alleviate the
thermal issue and to protect the regulator. The
MP2318 exits the hiccup mode once the over
current condition is removed.
If both VIN and EN are higher than their
appropriate thresholds, the chip starts. The
reference block starts first, generating stable
reference voltage and currents, and then the
internal regulator is enabled. The regulator
provides stable supply for the remaining
circuitries.
Three events can shut down the chip: EN low,
VIN low and thermal shutdown. In the shutdown
procedure, the signaling path is first blocked 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.
Thermal Shutdown
Thermal shutdown is implemented to prevent
the chip from operating at exceedingly high
MP2318 Rev. 1.0
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MP2318 – 24V, 2A SYNC STEP-DOWN CONVERTER
APPLICATION INFORMATION
COMPONENT SELECTION
Setting the Output Voltage
VOUT ×(V − VOUT
)
IN
L1 =
V × ∆IL × fOSC
IN
Where ΔIL is the inductor ripple current.
The external resistor divider is used to set the
output voltage (see Typical Application on page
1). The feedback resistor R1 also sets the
feedback loop bandwidth with the internal
compensation capacitor (see Typical Application
on page 1). R2 is then given by:
Choose inductor current to be approximately
30% of the maximum load current. The maximum
inductor peak current is:
∆IL
IL(MAX) = ILOAD
+
2
Under light load conditions below 100mA, larger
inductance is recommended for improved
efficiency.
The feedback network is as Figure 5 shows.
Setting the AAM Voltage
The AAM voltage is used to setting the transition
point from AAM to PWM. It should be chosen to
provide the best combination of efficiency,
stability, ripple, and transient.
If the AAM voltage is set lower, then stability and
ripple improves, but efficiency during AAM mode
and transient degrades. Likewise, if the AAM
voltage is set higher, then the efficiency during
AAM and transient improves, but stability and
ripple degrades. So the optimal balance point of
AAM voltage for good efficiency, stability, ripple
and transient should be found out.
Figure 5: Feedback Network
Table 1 lists the recommended feedback
resistors value for common output voltages.
Table 1—Resistor Selection for Common
Output Voltages
VOUT (V) R1 (kΩ) R2 (kΩ) Cf (pF) L(µH)
Adjust the AAM threshold by connecting a
resistor from AAM pin to ground. Take Figure 6
as reference. An internal 6.2µA current source
charges the external resistor.
1.05
1.2
1.8
2.5
3.3
5
80.6
80.6
40.2
40.2
20
255
160
12
12
12
12
22
22
0.68
0.68
0.82
0.82
1
31.6
18.7
6.34
3.74
1
AAM
20
1.5
3
Selecting the Inductor
A 0.47µH to 4.7µH inductor with a DC current
rating of at least 25% percent higher than the
maximum load current is recommended for most
applications. For highest efficiency, the inductor
DC resistance should be less than 15mΩ. For
most designs, the inductance value can be
derived from the following equation.
Figure 6: AAM Network
Generally, R3 is then given by:
VAAM=R3 x 6.2uA
The optimized AAM can be got from Figure 7.
MP2318 Rev. 1.0
3/2/2014
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MP2318 – 24V, 2A SYNC STEP-DOWN CONVERTER
ILOAD
IC1
=
2
For simplification, choose the input capacitor
whose RMS current rating greater than half of
the maximum load current.
The input capacitor can be electrolytic, tantalum
or ceramic. When using electrolytic or tantalum
capacitors, a small, high quality ceramic
capacitor, i.e. 0.1μF, should be placed as close
to the IC as possible. When using ceramic
capacitors, make sure that they have enough
capacitance to provide sufficient charge to
prevent excessive voltage ripple at input. The
input voltage ripple caused by capacitance can
be estimated by:
ILOAD
VOUT
VOUT
∆V
=
×
× 1−
IN
fS ×C1
V
IN
V
IN
Selecting the Output Capacitor
The output capacitor (C2) is required to
maintain the DC output voltage. Ceramic,
tantalum, or low ESR electrolytic capacitors are
recommended. Low ESR capacitors are
preferred to keep the output voltage ripple low.
The output voltage ripple can be estimated by:
VOUT
VOUT
1
∆VOUT
=
× 1−
× R
+
Figure 7: AAM Selection for Common
Output Voltages
ESR
fS ×L1
V
8× fS ×C2
IN
Where L1 is the inductor value and RESR is the
equivalent series resistance (ESR) value of the
output capacitor.
Selecting the Input Capacitor
The input current to the step-down converter is
discontinuous, therefore a capacitor is required
to supply the 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. For most applications,
a 22µF capacitor is sufficient.
In the case of ceramic capacitors, the
impedance at the switching frequency is
dominated by the capacitance. The output
voltage ripple is mainly caused by the
capacitance. For simplification, the output
voltage ripple can be estimated by:
VOUT
8× fS2 ×L1 ×C2
VOUT
ΔVOUT
=
× 1−
V
IN
Since the input capacitor (C1) absorbs the input
switching current it requires an adequate ripple
current rating. The RMS current in the input
capacitor can be estimated by:
In the case of tantalum or electrolytic capacitors,
the ESR dominates the impedance at the
switching frequency. For simplification, the
output ripple can be approximated to:
VOUT
VOUT
IC1 = ILOAD
×
× 1−
V
V
IN
IN
The worse case condition occurs at VIN =
2VOUT, where:
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MP2318 – 24V, 2A SYNC STEP-DOWN CONVERTER
3) Ensure all feedback connections are short
and direct. Place the feedback resistors and
compensation components as close to the chip
as possible.
VOUT
VOUT
ΔVOUT
=
× 1−
×RESR
fS ×L1
V
IN
The characteristics of the output capacitor also
affect the stability of the regulation system. The
MP2318 can be optimized for a wide range of
capacitance and ESR values.
4) Route SW away from sensitive analog areas
such as FB.
Notes:
6) The recommended layout is based on the Figure 10 Typical
Application circuit on the page 16.
External Bootstrap Diode
An external bootstrap diode may enhance the
efficiency of the regulator, the applicable
conditions of external BST diode are:
C4
VOUT is 5V or 3.3V; and
R5
C3
C5
R1
VOUT
8
1
7
2
6
5
4
Duty cycle is high: D=
>65%
VIN
L1
In these cases, an external BST diode is
recommended from the VCC pin to BST pin, as
shown in Figure 8.
R3 R2
3
R4
C6
GND
RBST
C2
C1
V
OUT
V
IN
MP2318
Figure 8: Add Optional External
Bootstrap Diode to Enhance Efficiency
The recommended external BST diode is
IN4148, and the BST cap is 0.1─1μF.
PC Board Layout (6)
PCB layout is very important to achieve stable
operation. Please follow these guidelines and
take Figure 9 as reference.
1) Keep the connection of input ground and
GND pin as short and wide as possible.
Figure 9: Sample Board Layout
2) Keep the connection of input capacitor and
IN pin as short and wide as possible.
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MP2318 – 24V, 2A SYNC STEP-DOWN CONVERTER
Design Example
Below is a design example following the
application guidelines for the specifications:
Table 2: Design Example
VIN
VOUT
IO
19V
3.3V
2A
The detailed application schematics are shown
in Figures 10 through 15. 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.
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MP2318 – 24V, 2A SYNC STEP-DOWN CONVERTER
TYPICAL APPLICATION CIRCUITS
5
20
24
5
C4
1.5uH
MP2318
5
R
54.9k
20
22
4
100
6
3.74k
Figure 10: Vin=19V, Vo=5V, Io=2A
5
20
24
5
C4
1uH
MP2318
3.3
R
40.2k
20
22
4
6
100
6.34k
Figure 11: Vin=19V, Vo=3.3V, Io=2A
5
20
24
5
C4
0.82uH
MP2318
2.5
R
28.7k
40.2
12
4
6
100
18.7k
Figure 12: Vin=19V, Vo=2.5V, Io=2A
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MP2318 – 24V, 2A SYNC STEP-DOWN CONVERTER
5
20
21
5
C4
0.82uH
1.8
MP2318
R
32.4k
40.2
12
4
6
100
31.6k
Figure 13: Vin=12V, Vo=1.8V, Io=2A
5
20
14
5
C4
0.68uH
MP2318
1.2
R
19.1k
80.6
12
4
100
6
160k
Figure 14: Vin=12V, Vo=1.2V, Io=2A
5
20
13
5
C4
0.68uH
MP2318
1.05
R
13k
80.6
12
4
100
6
255k
Figure 15: Vin=12V, Vo=1.05V, Io=2A
MP2318 Rev. 1.0
3/2/2014
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
17
MP2318 – 24V, 2A SYNC STEP-DOWN CONVERTER
PACKAGE INFORMATION
TSOT23-8
See note 7
EXAMPLE
TOP MARK
IAAAA
PIN 1 ID
RECOMMENDED LAND PATTERN
TOP VIEW
SEATING PLANE
SEE DETAIL ''A''
FRONT VIEW
SIDE VIEW
NOTE:
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) PACKAGE LENGTH DOES NOT INCLUDE MOLD
FLASH, PROTRUSION OR GATE BURR.
3) PACKAGE WIDTH DOES NOT INCLUDE
INTERLEAD FLASH OR PROTRUSION.
4) LEAD COPLANARITY (BOTTOM OF LEADS
AFTER FORMING) SHALL BE 0.10 MILLIMETERS
MAX.
DETAIL ''A''
5) JEDEC REFERENCE IS MO-193, VARIATION BA.
6) DRAWING IS NOT TO SCALE.
7) PIN 1 IS LOWER LEFT PIN WHEN READING TOP
MARK FROM LEFT TO RIGHT, (SEE EXAMPLE TOP
MARK)
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.
MP2318 Rev. 1.0
3/2/2014
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
18
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