MP2324
High Efficiency 2A, 24V, 500kHz
Synchronous Step-Down Converter
DESCRIPTION
The MP2324 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
MP2324 has synchronous mode operation for
higher efficiency over output current load range.
Current mode operation provides fast transient
response and eases loop stabilization.
Full protection features include OCP and
thermal shut down.
The MP2324 requires a minimum number of
readily available standard external components
and is available in a space saving 8-pin
TSOT23 package.
FEATURES
Wide 4.5V to 24V Operating Input Range
120mΩ/50mΩ Low Rds(on) Internal Power
MOSFETs
Low Quiescent Current
High Efficiency Synchronous Mode
Operation
Fixed 500kHz Switching Frequency
Frequency Sync from 200kHz to 2MHz
External Clock
Power Save Mode at light load
Internal Soft Start
Power Good Indicator
OCP Protection and Hiccup
Thermal Shutdown
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
MP2324 Rev. 1.0
12/4/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
1
MP2324 – 24V, 2A SYNC STEP-DOWN CONVERTER
ORDERING INFORMATION
Part Number*
MP2324GJ
Package
TSOT23-8
Top Marking
AHV
* For Tape & Reel, add suffix –Z (e.g. MP2324GJ–Z);
PACKAGE REFERENCE
TSOT23-8
ABSOLUTE MAXIMUM RATINGS
(1)
V
IN
............................................... –0.3V to +28V
V
SW
.......–0.3V (-5V<10ns) to +28V (30V <10ns)
V
BST
...................................................... V
SW
+6V
All Other Pins ................................. -0.3V to +6V
(2)
Continuous Power Dissipation (TA=+25°C) ...
................................................................ 1.25W
Junction Temperature .............................. 150°C
Lead Temperature ................................... 260°C
Storage Temperature ................. -65°C to 150°C
Thermal Resistance
(4)
θ
JA
θ
JC
TSOT23-8…………………...……
.100…..55..°C/W
Notes:
1) Exceeding these ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature T
J
(MAX), the junction-to-
ambient thermal resistance θ
JA
, and the ambient temperature
T
A
. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by P
D
(MAX) = (T
J
(MAX)-T
A
)/θ
JA
. 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.
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on JESD51-7, 4-layer PCB.
Recommended Operating Conditions
(3)
Supply Voltage V
IN
............................. 4.5 to 24V
Output Voltage V
OUT
................. 0.8V to V
IN
*D
MAX
Operating Junction Temp (T
J
). . -40°C to +125°C
MP2324 Rev. 1.0
12/4/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
2
MP2324 – 24V, 2A SYNC STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS
V
IN
= 12V, T
A
= 25°C, unless otherwise noted.
Parameter
Supply Current (Shutdown)
Supply Current (Quiescent)
HS Switch On Resistance
LS Switch On Resistance
Switch Leakage
Current Limit
(5)
Symbol
I
IN
I
q
Condition
V
EN
= 0V
V
EN
= 2V, V
FB
= 1V
Min
130
Typ
5.5
180
120
50
Max
240
Units
μA
μA
mΩ
mΩ
HS
RDS-ON
V
BST-SW
=5V
LS
RDS-ON
V
CC
=5V
SW
LKG
I
LIMIT
f
SW
f
FB
D
MAX
T
ON_MIN
f
SYNC
V
FB
I
FB
V
EN_RISING
V
EN_HYS
I
EN
EN
Td-off
PG
VTH-Hi
PG
VTH-LO
PG
Td
V
EN
=2V
V
EN
=0
T
A
=25ºC
V
FB
=820mV
1.2
80
1.5
0.2
783
V
EN
= 0V, V
SW
=12V
Duty Cycle=40%
V
FB
=750mV
V
FB
=200mV
V
FB
=750mV
90
3
420
1
4
500
0.5
95
60
2
791
10
1.4
150
2
0
6
10
0.9
0.85
40
799
50
1.6
220
2.5
50
14
620
μA
A
kHz
f
SW
%
ns
MHz
mV
nA
V
mV
μA
nA
μs
V
FB
V
FB
μs
Oscillator Frequency
Fold-back Frequency
Maximum Duty Cycle
Minimum On Time
Feedback Voltage
Feedback Current
EN Rising Threshold
EN Hysteresis
EN Input Current
EN Turn Off Delay
Power Good Rising Threshold
Power Good Falling Threshold
Power Good Delay
Power Good
Capability
Sink
Current
(5)
Sync Frequency Range
V
PG
I
PG-LEAK
INUV
Vth
Sink 1mA
0.4
1
3.7
550
4.65
3.9
650
4.9
1
1.5
150
20
4.1
750
5.15
3
2.2
V
μA
V
mV
V
%
ms
ºC
ºC
Power Good Leakage Current
VIN Under Voltage Lockout
Threshold-Rising
VIN Under Voltage Lockout
INUV
HYS
Threshold-Hysteresis
VCC Regulator
VCC Load Regulation
Soft-Start Period
Thermal Shutdown
(5)
(5)
V
CC
I
CC
=5mA
T
SS
0
0.8
Thermal Hysteresis
Notes:
5) Guaranteed by design
MP2324 Rev. 1.0
12/4/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
3
MP2324 – 24V, 2A SYNC STEP-DOWN CONVERTER
TYPICAL CHARACTERISTICS
V
IN
= 12V, V
OUT
= 3.3V, L = 6.5μH, T
A
= 25°C, unless otherwise noted.
MP2324 Rev. 1.0
12/4/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
4
MP2324 – 24V, 2A SYNC STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
V
IN
= 12V, V
OUT
= 3.3V, L = 6.5μH, T
A
= 25°C, unless otherwise noted.
MP2324 Rev. 1.0
12/4/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
5
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