MP1567 – 1.2A SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS
(continued)
V
IN
= 5V, T
A
= +25°C, unless otherwise noted.
Parameter
Error Amplifier
Voltage Gain
Transconductance
COMP Maximum Output Current
FB Regulation Voltage
FB Input Bias Current
Soft-Start
Soft-Start Current
Output Switch On-Resistance
Switch On Resistance
Synchronous Rectifier On Resistance
Switch Current Limit (Source)
Synchronous Rectifier Current Limit (Sink)
Thermal Shutdown
Symbol
A
VEA
G
EA
V
FB
I
FB
I
SS
V
IN
= 5V
V
IN
= 3V
V
IN
= 5V
V
IN
= 3V
1.5
875
FB = 0.9V
Condition
Min
Typ
400
300
±30
905
–100
2
265
330
220
270
2.0
350
160
Max
Units
V/V
µA/V
µA
mV
nA
µA
mΩ
mΩ
mΩ
mΩ
A
mA
°C
935
TYPICAL PERFORMANCE CHARACTERISTICS
V
IN
= 3.3V, V
OUT
= 1.8V, T
A
= +25°C, unless otherwise noted.
Current Limit vs.
Load Transient
0.1A to 1A Load Step
Duty Cycle
2.5
2.0
1.5
1.0
0.5
0
I
LOAD
0.5A/div.
V
OUT
50mV/div.
CURRENT LIMIT (A)
V
SS
1V/div.
V
OUT
1V/div.
I
IN
0.5A/div.
0
20
40
60
DUTY CYCLE (%)
80
MP1567-TPC01
MP1567-TPC02
2ms/div.
MP1567-TPC03
Output Short Circuit
I
OUT
= 1.2A
Steady State
V
OUT
1V/div.
V
SW
2V/div.
V
SS
1mV/div.
I
INDUCTOR
1A/div.
I
INDUCTOR
1A/div.
2ms/div.
MP1567-TPC04
MP1567-TPC05
MP1567 Rev. 2.4
9/21/2007
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
3
MPS [ MONOLITHIC POWER SYSTEMS ]
