MP3414AGJ [MPS]
3A, 1MHz, 22uA Iq, 5.5V Synchronous Step-Up Converter with Output Disconnect;
| 型号： | MP3414AGJ |
| 厂家： | 
MONOLITHIC POWER SYSTEMS |
| 描述： | 3A, 1MHz, 22uA Iq, 5.5V Synchronous Step-Up Converter with Output Disconnect 开关 光电二极管 输出元件 |
| 文件： | 总17页 (文件大小：1298K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MP3414A
3A, 1MHz, 22μA Iq, 5.5V Synchronous
Step-Up Converter with Output Disconnect
DESCRIPTION
FEATURES
The MP3414A is a high-efficiency, synchronous
current mode, step-up converter with output
disconnect.
Supports 5V/1A Output at 2.8V Input
1.8V to 5.5V Input Voltage Range
Up to 5.5V Output Voltage
Internal Synchronous Rectifier
1MHz Fixed Switching Frequency
22μA Quiescent Current
<1μA Shutdown Current
True Output Disconnect from Input
Up to 97% Efficiency
Internal Compensation, Inrush Current
Limiting, and Internal Soft Start
Tiny External Components
OVP, SCP, and OTP
The MP3414A can start up from an input
voltage as low as 1.8V while providing inrush
current limiting and output short-circuit
protection (SCP). The integrated P-channel
synchronous rectifier improves efficiency and
eliminates the need for an external Schottky
diode. The PMOS disconnects the output from
the input when the MP3414A shuts down. The
output disconnect feature allows the output to
be discharged completely, allowing the
MP3414A to draw a supply current of under
1μA in shutdown mode.
TSOT23-8 Package
APPLICATIONS
The 1MHz switching frequency allows small
external components while the internal
compensation and soft start minimize the
external component count. These features
produce a compact solution for a wide current
load range.
Two-Cell and Three-Cell Alkaline, NiCd or
NiMH, or Single-Cell Li Battery-Power
Products
Personal Medical Devices
Portable Media Players
Wireless Peripherals
The MP3414A features an integrated power
MOSFET that supports an output of up to 5.5V
and a peak switching current above 3A.
Gaming Accessories
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.
The MP3414A is available in a small 8-pin
TSOT23 package.
TYPICAL APPLICATION
L1 1.5uH
SW
VIN
VOUT
IN
OUT
C1
10μF
C2
22μF
R1
1MΩ
MP3414A
FB
AGND
OFF
ON
EN
PGND
R2
137kΩ
MP3414A Rev. 1.1
6/26/2017
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2017 MPS. All Rights Reserved.
1
MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT
ORDERING INFORMATION
Part Number*
Package
Top Marking
MP3414AGJ
TSOT23-8
See Below
* For Tape & Reel, add suffix –Z (e.g. MP3414AGJ–Z)
TOP MARKING
AKT: Product code of MP3414AGJ
Y: Year code
PACKAGE REFERENCE
TOP VIEW
1
2
3
4
8
7
6
5
IN
OUT
EN
FB
SW
AGND
FTY
PGND
MP3414A Rev. 1.1
6/26/2017
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© 2017 MPS. All Rights Reserved.
2
MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT
ABSOLUTE MAXIMUM RATINGS (1)
SW, OUT ................................... -0.3V to +6.5V
SW (<5ns) .................................... -0.3V to +9V
All other pins............................... -0.3V to +6.5V
Continuous power dissipation (TA = +25°C) (2)
................................................................1.25W
Junction temperature...............................150C
Lead temperature ....................................260C
Storage temperature................-65C to +150C
Recommended Operating Conditions (3)
Supply voltage (VIN) ....................... 1.8V to 5.5V
VOUT .............................VIN-MAX x 106% to 5.5V(4)
Operating junction temp. (TJ). ..-40°C to +125°C
Thermal Resistance (5)
TSOT23-8 ..............................100 ....55 ... °C/W
θJA θJC
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 will produce an excessive die temperature,
causing the regulator to go into thermal shutdown. Internal
thermal shutdown circuitry protects the device from
permanent damage.
3) The device is not guaranteed to function outside of its
operating conditions.
4) If VIN is close to VOUT, the boost converter may trigger
minimum on-time. When VIN is higher than VOUT, the boost
converter will switch between boost mode and linear charge
mode. Both conditions will result in a VOUT-RIPPLE that is too
high. Therefore, this is not suggested.
5) Measured on JESD51-7, 4-layer PCB.
MP3414A Rev. 1.1
6/26/2017
www.MonolithicPower.com
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© 2017 MPS. All Rights Reserved.
3
MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT
ELECTRICAL CHARACTERISTICS
VIN = VEN = 3.3V, VOUT = 5V, TJ = -40°C to 125°C, typical value is tested at TJ = 25°C, unless
otherwise noted.
Parameters
Symbol Condition
Min
Typ Max Units
Voltage Range
VEN = VIN = 3.3V, VOUT = 5V,
no load, VFB = 0.65V,
measured on OUT, TJ = 25°C
22
30
12
µA
Quiescent current
IQ
VEN = VIN = 3.3V, VOUT = 5V,
no load, VFB = 0.65V,
measured on IN, TJ=25°C
8
µA
µA
VEN = VOUT = 0V,
Shutdown current
ISD
0.1
1
measured on IN TJ = 25oC
IN under-voltage lockout
VIN_UVLO
VIN rising, TJ = 25°C.
1.65
100
1.7
V
IN under-voltage lockout
hysteresis
mV
Step-Up Converter
Operation frequency
FSW
VFB
0.8
594
591
1.0
600
600
1
1.2
606
609
50
MHz
mV
mV
nA
TJ = 25°C
Feedback voltage reference
TJ = -40°C to 125°C
VFB = 0.63V
Feedback input current
NMOS on resistance
NMOS leakage current
PMOS on resistance
PMOS leakage current
Maximum duty cycle
IFB
RNDS_ON
IN_LK
70
mΩ
µA
mΩ
µA
%
VSW = 6.5V, TJ = 25°C.
VSW = 6.5V, VOUT = 0V, TJ = 25°C.
VIN = 4V, Vo = 0V
0.1
80
1
1
RPDS_ON
IP_LK
0.1
95
DMAX
85
0.3
A
Start-up current limit
IST_LIMIT
ISW_LIMIT
VIN = 4V, Vo setting = 3.6V,
pull Vo to 3.3V
0.8
3.6
A
A
NMOS current limit
Logic Interface
Duty = 40%
3
EN input high-level voltage
EN input low-level voltage
EN input current
VEN_H
VEN_L
IEN
1.2
V
V
0.4
Connect to VIN
10
nA
Protection
Thermal shutdown(6)
Over-temperature hysteresis(6)
NOTE:
155
25
°C
°C
6) Guaranteed by characterization, not production tested.
MP3414A Rev. 1.1
6/26/2017
www.MonolithicPower.com
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4
MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.3V, VOUT = 5V, L = 1.5µH, TA = 25°C, unless otherwise noted.
MP3414A Rev. 1.1
6/26/2017
www.MonolithicPower.com
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© 2017 MPS. All Rights Reserved.
5
MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 3.3V, VOUT = 5V, L = 1.5µH, TA = 25°C, unless otherwise noted.
MP3414A Rev. 1.1
6/26/2017
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6
MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 3.3V, VOUT = 5V, L = 1.5µH, TA = 25°C, unless otherwise noted.
NOTE:
7) Tested with a 3A inductor peak current with the schematic in Figure 3. The maximum load current may decrease if the temperature rising
is limited on the real application board.
MP3414A Rev. 1.1
6/26/2017
www.MonolithicPower.com
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7
MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 3.3V, VOUT = 5V, L = 1.5µH, TA = 25°C, unless otherwise noted.
MP3414A Rev. 1.1
6/26/2017
www.MonolithicPower.com
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8
MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 3.3V, VOUT = 5V, L = 1.5µH, TA = 25°C, unless otherwise noted.
MP3414A Rev. 1.1
6/26/2017
www.MonolithicPower.com
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© 2017 MPS. All Rights Reserved.
9
MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT
PIN FUNCTIONS
Pin #
Name Pin Function
Power supply input. The start-up bias is derived from IN and must be bypassed locally.
Once the OUT voltage exceeds the IN voltage, the bias power comes from OUT.
1
IN
Output. OUT is the drain of the internal synchronous rectifier MOSFET. Bias power is
derived from OUT when VOUT is higher than VIN. The PCB trace length from OUT to the
output filter capacitor(s) should be as short and wide as possible. The output disconnect
feature allows OUT to be disconnected completely from IN when EN is low.
2
3
OUT
Power switch output. SW is the connection node of the internal low-side MOSFET and
synchronous MOSFET. Connect the power inductor between SW and the input power. Keep
the PCB trace length as short and wide as possible to reduce EMI and voltage spikes.
SW
4
5
6
PGND Power ground.
FTY
Factory use only. Leave FTY floating or connect it to ground in application.
AGND Analog ground.
Feedback. Connect to the tap of an external resistive voltage divider from the output to FB
to set the output voltage.
7
8
FB
EN
Chip enable control input. Set EN higher than 1.2V to turn on the regulator. Set EN lower
than 0.4V to turn off the regulator.
MP3414A Rev. 1.1
6/26/2017
www.MonolithicPower.com
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10
MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT
FUNCTION DIAGRAM
VIN
L
CIN
PGND
SW
IN
Enable
EN
Bias and
Voltage Ref
VIN
OFF
ON
Body
Control
VOUT
VBETTER
VDD
OVP
OUT
HS
Thermal
Control
COUT
Current Sense
Driver and
Control logic
OUT
Start-Up
Mode Control
R1
PGND
LS
PGND
Current
Limit
Oscillator
S
Current Sense
Amplifier
+
-
Slope
COMP
PGND
FB
+
-
+
+
PWM
COMP
-
EA
Soft Start
R2
AGND
0.6V
Clamp
PGND
Figure 1: Functional Block Diagram
MP3414A Rev. 1.1
6/26/2017
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11
MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT
OPERATION
The MP3414A is a 1MHz synchronous step-up
converter in a compact TSOT23 package with
true output disconnect. The device features a
fixed-frequency, current-mode PWM control for
good line and load regulation. Internal soft start
and loop compensation simplify the design
process and minimize external components.
The combined internal low RDS (ON) MOSFETs
and frequency stretching allow the MP3414A to
maintain high efficiency over a wide current
load range.
circuits switch off, and the output disconnects
from the input completely.
Power-Save Mode (PSM)
The MP3414A enters power-save mode (PSM)
automatically when the load decreases. It
switches back to PWM mode when the load
increases. In PSM, the converter stretches the
frequency down to save switching and driver
losses. In addition, the switch frequency is
stretched down too when the input voltage is
close to the output voltage (which triggers the
minimum on-time if kept at a 1MHz frequency).
This helps decrease the output ripple by
avoiding group-pulse mode. Under a very light-
load condition, the MP3414A continues to run in
group-pulse mode to regulate the output
voltage and save more power.
Start-Up
When enabled, the MP3414A starts up in linear
charge mode. During the linear charge, the
rectified PMOS turns on until the output voltage
is charged close to VIN. To avoid inrush current,
the PMOS current is limited to about 0.3A
(when VOUT is 0V). The PMOS linear charge
current limit is increased to about 0.8A while
VOUT rises to 3.3V (if VIN is higher than 3.3V).
This circuit helps limit the output current under
short-circuit conditions. Once the output voltage
reaches VIN, the linear charging period elapses,
and the device starts switching. VOUT starts to
rise under the control of the internal soft start
(SS). In boost switching conditions, the current
limit is 3.6A, typically.
Error Amplifier (EA)
The error amplifier (EA) is an internally
compensated amplifier. The EA compares the
internal 0.6V reference voltage against VFB to
generate an EA signal, which in turn controls
VOUT. The output voltage of the MP3414A is
adjusted via FB by an external resistor divider.
See Equation (1):
R1
(1)
VOUT 0.6V(1
)
R2
When the output voltage is higher than VIN, the
MP3414A powers its internal circuits from VOUT
instead of VIN. This allows strong driving
capabilities and high efficiency, even if VIN
drops as low as 1.8V.
Setting a high value for R1 and R2 achieves a
low quiescent current. However, a resistance
set too high will be sensitive to noise and lead
to a low loop bandwidth. Set the R1 value
between 499kΩ to 1MΩ for good leakage,
stability and transient balance.
Soft Start (SS)
The MP3414A provides a soft start (SS) by
charging an internal capacitor with a current
source. During the linear charge period, the SS
signal keeps rising, following FB. Once the
linear charge elapses, the voltage on the SS
capacitor is charged and ramps up the
reference voltage based on the internal fixed
slew-rate. The SS capacitor is discharged
completely during a commanded shutdown,
thermal shutdown, or short circuit at the output.
Current Sensing
In a linear charge condition, the high-side
PMOS current is sensed and compared with the
current limit threshold. The compared output
manages the linear charge current.
In a boost switching condition, lossless current
sensing converts the NMOS switch current
signal to a voltage that is summed with the
internal slope compensation. The summed
signal is compared with the EA output to
provide a peak current control command for the
PWM. The peak switch current is limited to
approximately 3.6A. The switch current signal is
Device Enable (EN)
The device begins operating if EN is set higher
than 1.2V. It enters shutdown mode if EN is
lower than 0.4V. In shutdown mode, the
regulator stops switching, all internal control
MP3414A Rev. 1.1
6/26/2017
www.MonolithicPower.com
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© 2017 MPS. All Rights Reserved.
12
MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT
blanked for 60ns internally to enhance noise
Over-Voltage Protection (OVP)
immunity.
If the voltage on VOUT is higher than the typical
6V threshold, the boost switching stops. After
the output drops to about 5.7V, the switching
recovers automatically. This protects the
internal power MOSFET from over-voltage
stress.
Output Disconnect
The MP3414A is designed to allow a true
output disconnect by eliminating body diode
conduction of the internal PMOS rectifier. This
allows VOUT to reach 0V during shutdown,
drawing zero current from the input source.
Thermal Shutdown (TSD)
The device has an internal temperature monitor.
If the die temperature exceeds 155°C, the
converter turns off. Once the temperature drops
below 130°C, the converter restarts.
This also allows for inrush current limiting at
start-up, which minimizes the surge current
seen by the input supply. To obtain the
advantages of the output disconnect, there
must NOT be an external Schottky diode
connected between SW and VOUT
.
Overload (OLP) and Short-Circuit Protection
(SCP)
When an overload or a short circuit occurs, the
output voltage drops. If VOUT drops below VIN
(0.3V), the MP3414A stops for about 50µs and
then runs in a linear charge mode at start-up. If
the overload or short circuit is removed, the
MP3414A restarts automatically under SS
control.
MP3414A Rev. 1.1
6/26/2017
www.MonolithicPower.com
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13
MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT
ΔIL = Acceptable inductor current ripple
APPLICATION INFORMATION
Typically, the inductor current ripple is set to
30% to 50% of the maximum inductor current.
Maintain a low DCR (series resistance of the
inductor) to reduce resistive power loss. The
saturated current (ISAT) should be large enough
to support the peak current.
COMPONENT SELECTION
Input Capacitor Selection
Low equivalent series resistance (ESR) input
capacitors reduce input switching noise and
reduce the peak current drawn from the battery.
Ceramic capacitors are recommended for input
decoupling and should be placed as close to
the device as possible. A ceramic capacitor
larger than 10μF is recommended to limit the
VIN ripple.
PCB Layout Guidelines
Efficient PCB layout is critical for high-
frequency switching power supplies.
Poor
layout can result in reduced performance,
excessive EMI, resistive loss, system instability,
and even over-voltage stress.
Output Capacitor Selection
To ensure stability over the full operating range,
the output capacitor requires a minimum
capacitance value of 22μF at the programmed
output voltage. A higher capacitance value may
be required to lower the output and transient
ripple. Low ESR capacitors such as X5R or
X7R type are recommended. Supposing the
ESR is zero, use Equation 2 to calculate the
minimum output capacitor to support the ripple
in the PWM mode:
For best results, refer to Figure 2 and follow the
guidelines below:
1. Place the output capacitor as close as
possible to OUT with minimal distance to
PGND. A small decoupling capacitor
should be in parallel with the bulk output
capacitor.
2. Place the small decoupling capacitor as
close as possible to OUT and PGND. This
is very important to reduce the spikes on
SW and improve EMI performance.
3. Place the input capacitor and inductor as
close as possible to IN and SW. The trace
between the inductor and SW should be as
wide and short as possible.
4. Place the feedback loop far away from all
noise sources (such as SW). The feedback
divider resistors should be as close as
possible to FB and AGND.
IO (VOUT(MAX) V
)
IN(MIN)
CO
(2)
fS VOUT(MAX)ΔV
VOUT(MAX) = Maximum output voltage
VIN(MIN) = Minimum input voltage
IO = Output current
fS = Switching frequency
ΔV = Acceptable output ripple
A 1μF ceramic capacitor is recommended
between VOUT and PGND with a short loop. This
reduces spikes on the SW node and improves
EMI performance.
5. Tie the ground return of the input/output
capacitors as close as possible to PGND
using a large copper GND area. Vias
around GND are recommended to lower
the die temperature.
Inductor Selection
The MP3414A utilizes small surface mounted
chip inductors due to its 1MHz switching
frequency. Inductor values between 1μH and
2.2μH are suitable for most applications. Larger
values of inductance allow for slightly greater
output current capabilities by reducing the
inductor ripple current. However, larger value
inductances will increase the component size.
The minimum inductance value is given using
Equation (3):
V
IN(MIN) (VOUT(MAX) V
)
IN(MIN)
L
(3)
VOUT(MAX) IL fS
MP3414A Rev. 1.1
6/26/2017
www.MonolithicPower.com
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© 2017 MPS. All Rights Reserved.
14
MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT
Top Layer
Design Example
Bottom Layer
Via
See Table 1 below for a design example
following the application guidelines for the
R1
specifications below:
R2
Table 1: Design Example
L1
VIN
VOUT
IOUT
2.8V-4.2V
5V
0A-1A
MP3414A
C2A
C1
The typical application circuit for VOUT = 5V in
Figure 3 shows the detailed application
schematic and the basis for the typical
performance waveforms. For additional detailed
device applications, please refer to the related
evaluation board datasheet (EVB).
C2B
VIN
GND VOUT GND
Figure 2: Recommended PCB Layout
MP3414A Rev. 1.1
6/26/2017
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15
MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT
TYPICAL APPLICATION CIRCUITS
L1 1.5μH
VOUT
SW
OUT
FB
C2B
1μF
C2A
22μF
R1
1MΩ
U1
MP3414A
VIN
GND
GND
IN
R2
137kΩ
C1
10μF
R3
100k
EN
AGND
GND
GND
GND
Figure 3: Typical Boost Application Circuit, VIN = 2.8V to 4.2V, VOUT = 5V, IOUT = 0A-1A
L1 1.5μH
VOUT
SW
IN
OUT
FB
C2B
1μF
C2A
22μF
R1
1MΩ
U1
MP3414A
VIN
GND
GND
R2
C1
10μF
R3
100k
220k
Ω
EN
AGND
GND
GND
GND
Figure 4: Typical Boost Application Circuit, VIN = 1.8V to 3V, VOUT = 3.3V, IOUT = 0A-1A
MP3414A Rev. 1.1
6/26/2017
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16
MP3414A—3A, 1MHz STEP-UP CONVERTER WITH OUTPUT DISCONNECT
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.
5) JEDEC REFERENCE IS MO-193, VARIATION BA.
6) DRAWING IS NOT TO SCALE.
DETAIL ''A''
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.
MP3414A Rev. 1.1
6/26/2017
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17
Preliminary Specifications Subject to Change
© 2017 MPS. All Rights Reserved.
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9A, 600kHz High Efficiency, Synchronous Step-Up Converter with Output Disconnect in 2x2mm QFN Package
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