MP2136
2.5V to 6V Input, 2MHz, 1A
Synchronous Step-Down Converter
The Future of Analog IC Technology
DESCRIPTION
The MP2136 is a 2MHz constant frequency,
current mode, PWM step-down converter with
integrated main switch and synchronous
rectifier that is ideal for powering portable
equipment that runs from a single Li-Ion or Li-
Polymer battery.
The MP2136 can supply up to 1A load current
from a 2.5V to 6V input voltage. The output
voltage can be as low as 0.6V.
Additional features include <1µA shutdown
current, internal soft-start, cycle-by-cycle over
current protection, short circuit protection, and
thermal shutdown.
The MP2136 is available in a 6-pin, QFN6
2mm×2mm package.
FEATURES
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2MHz Constant Switching Frequency
1A Available Load Current
2.5V to 6V Input Voltage Range
Output Voltage as Low as 0.6V
Current Mode Control
Cycle-by-Cycle Over Current Protection
Short Circuit Protection
Thermal Shutdown
<1µA Shutdown Current
Internal Soft-Start
Space-Saving 6-pin, QFN6 2mm×2mm
package
Cellular Phones
Microprocessors and DSP Core Supplies
PDAs and Smart Phones
MP3 and Portable Media Players
Digital Still and Video Cameras
Portable Instruments
APPLICATIONS
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“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
Efficiency vs.
Output Current
U1
L1
1.2uH
100
R1
300k
1%
R2
300k
1%
L=2.2uH Vo=1.2V
Vin=3.3V
EFFICIENCY (%)
VIN
2.5V - 6V
C1
4.7uF
3
IN
4
SW
MP2136EG
C2
10uF
VOUT
1.2V/1A
90
80
70
60
50
40
30
20
10
0
OFF ON
EN
2
EN
1
NC
FB
GND
6
5
Vin=6V
Vin=5V
Vin=2.5V
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
OUTPUT CURRENT (A)
MP2136 Rev. 0.9
8/23/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
1
MP2136 – 2.5V TO 6V INPUT, 2MHz, 1A SYNCHRONOUS STEP-DOWN CONVERTER
ORDERING INFORMATION
Part Number*
MP2136EG
Package
QFN6 (2mmx2mm)
Top Marking
6Q
Free Air Temperature(
T
A
)
–
20°C to +85°C
* For Tape & Reel, add suffix –Z (eg. MP2136EG–Z).
For RoHS Compliant Packaging, add suffix –LF (eg. MP2136EG–LF–Z)
PACKAGE REFERENCE
TOP VIEW
NC
1
6
FB
EN
2
5
GND
VIN
3
4
SW
ABSOLUTE MAXIMUM RATINGS
(1)
IN to GND ..................................
–
0.3V to +6.5V
SW to GND ..........................
–
0.3V to V
IN
+ 0.3V
FB, EN to GND .............................
–
0.3V to +6.5V
(2)
Continuous Power Dissipation. (T
A
= +25°C)
QFN6 (2mmx2mm) .................................... 2.5W
Junction Temperature ...............................150°C
Lead Temperature ....................................260°C
Storage Temperature...............
–
65°C to +150°C
Thermal Resistance
(4)
QFN6 (2mmx2mm) ................. 50 ...... 12...
°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.
θ
JA
θ
JC
Recommended Operating Conditions
(3)
Supply Voltage V
IN
.............................2.5V to 6V
Output Voltage V
OUT
...........................0.6V to 6V
Operating Junct.Temp. (T
J
)......
–
20°C to +125°C
MP2136 Rev. 0.9
8/23/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
2
MP2136 – 2.5V TO 6V INPUT, 2MHz, 1A SYNCHRONOUS STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS
(5)
V
IN
= V
EN
= 3.6V, T
A
= +25°C, unless otherwise noted.
Parameters
Supply Current
Condition
V
EN
= V
IN
, V
FB
= 0.65V
1.8
0.582
0.576
-50
Min
Typ
350
0.01
2.1
250
0.594
0.594
1.5
200
150
–1
1.6
0.4
150
2
150
20
1
1
2.3
0.606
0.612
50
Max
Units
µA
µA
V
mV
V
V
nA
A
mΩ
mΩ
µA
V
V
µs
MHz
°C
°C
Shutdown Current
V
EN
= 0V, V
IN
= 6V
IN Under Voltage Lockout Threshold Rising Edge
IN Under Voltage Lockout Hysteresis
T
A
= +25°C
Regulated FB Voltage
–40°C
≤
T
A
≤
+85°C
FB Input Bias Current
V
FB
= 0.65V
PFET Current Limit
Duty=100%
PFET On-Resistance
I
SW
= 100mA
NFET On-Resistance
I
SW
= –100mA
V
EN
= 0V; V
IN
= 6V
SW Leakage Current
V
SW
= 0V or 6V
EN High Threshold
–40°C
≤
T
A
≤
+85°C
EN Low Threshold
–40°C
≤
T
A
≤
+85°C
Internal Soft-Start Time
Oscillator Frequency
Thermal Shutdown Threshold
Hysteresis=20°C
Note:
5) Production test at +25°C. Specifications over the temperature range are guaranteed by design and characterization.
MP2136 Rev. 0.9
8/23/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
3
MP2136 – 2.5V TO 6V INPUT, 2MHz, 1A SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
V
OUT
=1.2V, L=1.2uH, C2=10uF, T
A
=25°C, unless otherwise noted.
Steady State Operation
Vin=2.5V, Vo=1.2V, Io=0A
V
OUT
/AC
10mV/div.
V
OUT
/AC
10mV/div.
Steady State Operation
Vin=2.5V, Vo=1.2V, Io=1A
V
OUT
/AC
10mV/div.
Steady State Operation
Vin=6V, Vo=1.2V, Io=0A
V
SW
2V/div.
I
INDUCTOR
500mA/div.
V
SW
2V/div.
V
SW
5V/div.
I
INDUCTOR
500mA/div.
I
INDUCTOR
500mA/div.
200ns/div.
200ns/div.
200ns/div.
Steady State Operation
Vin=6V, Vo=1.2V, Io=1A
V
OUT
/AC
10mV/div.
V
EN
2V/div.
Start-up Through Enable
Vin=2.5V, Vo=1.2V, Io=0A
V
EN
2V/div.
Start-up Through Enable
Vin=2.5V, Vo=1.2V, Io=1A
V
SW
5V/div.
V
OUT
500mV/div.
V
SW
2V/div.
I
INDUCTOR
500mA/div.
V
OUT
500mV/div.
V
SW
2V/div.
I
INDUCTOR
1A/div.
I
INDUCTOR
500mA/div.
200ns/div.
40us/div.
40us/div.
Start-Up Through EN
Vin=6V, Vo=1.2V, Io=0A
V
EN
2V/div.
V
OUT
500mV/div.
V
EN
2V/div.
V
OUT
500mV/div.
V
SW
5V/div.
Start-Up Through EN
Vin=6V, Vo=1.2V, Io=1A
V
EN
2V/div.
V
OUT
500mV/div.
V
SW
2V/div.
Power-Down Through EN
Vin=2.5V
, Vo=1.2V, Io=0A
V
SW
5V/div.
I
INDUCTOR
500mA/div.
I
INDUCTOR
1A/div.
I
INDUCTOR
500mA/div.
40us/div.
40us/div.
2s/div.
MP2136 Rev. 0.9
8/23/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
4
MP2136 – 2.5V TO 6V INPUT, 2MHz, 1A SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
(continued)
V
OUT
=1.2V, L=1.2uH, C2=10uF, T
A
=25°C, unless otherwise noted.
2.1
2.05
2
1.95
1.9
1.85
1.8
1.75
1.7
-40 -25 -10 5 20 35 50 65 80 95 110125
1.210
1.208
1.206
1.204
1.202
1.200
1.198
1.196
1.194
1.192
1.190
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Vin=5V
Vin=3.3V
1.4
1.2
1
0.8
0.6
0.4
0.2
0
2.5
3
3.5
4
4.5
5
5.5
6
Falling
Rising
MP2136 Rev. 0.9
8/23/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
5
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