MPQ4560 – 2A, 2MHz, 55V, STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS
V
IN
= 12V, V
EN
= 2.5V, V
COMP
= 1.4V, T
J
= –40°C to +125°C, unless otherwise noted. Typical Values
are at T
J
=25°C.
Parameter
Feedback Voltage
Feedback Leakage Current
Upper Switch On Resistance
Upper Switch Leakage
Current Limit
COMP to Current Sense
(5)
Transconductance
Error Amp Voltage Gain
(6)
(5)
Symbol
V
FB
I
FB
R
DS(ON)
I
SW
I
LIM
G
CS
Condition
T
J
=25°C
4.5V < V
IN
<
55V
−40°C
≤ T
J
≤85°C
−40°C
≤ T
J
≤125°C
Min
0.780
0.772
0.766
Typ
0.797
Max
0.820
0.829
0.829
Units
V
μA
mΩ
μA
0.1
V
BST
– V
SW
= T
J
=25°C
5V
V
EN
= 0V, V
SW
= 0V
T
J
=25°C
Duty Cycle ≤ 60%
2.6
2.2
5.7
400
I
COMP
= ±3µA
V
FB
= 0.7V
V
FB
= 0.9V
T
J
=25°C
2.7
2.4
0.35
0V < V
FB
< 0.8V
0.19
0.8
0.7
12
140
150
100
100
T
J
=25°C
1.4
1.3
320
1.55
0.5
1
T
J
=25°C
120
10
−10
3.0
175
160
1
3.2
250
1.0
330
400
4.5
4.7
A
A/V
V/V
µA/V
µA
µA
Error Amp Transconductance
Error Amp Min Source current
Error Amp Min Sink current
VIN UVLO Threshold
VIN UVLO Hysteresis
Soft-Start Time
(5)
3.3
3.6
V
V
ms
Oscillator Frequency
Shutdown Supply Current
Quiescent Supply Current
Thermal Shutdown
Minimum Off Time
Minimum On Time
(5)
(5)
(5)
f
SW
I
S
I
Q
t
OFF
t
ON
R
FREQ
=
95kΩ
V
EN
< 0.3V
1.2
1.3
20
200
MHz
µA
µA
°C
ns
ns
No load, V
FB
= 0.9V (no switching)
Hysteresis = 20°C
EN Rising Threshold
EN Threshold Hysteresis
1.7
1.8
V
mV
Note:
5) Derived from bench characterization. Not tested in production.
6) Guaranteed by design. Not tested in production.
MPQ4560 Rev. 1.1
www.MonolithicPower.com
3/29/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
3
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