MP28259 Datasheet, PDF (3/18 Pages) Monolithic Power Systems – High Efficiency, Fast Transient, 2A, 4.2V-20V Input Synchronous Step-down Converter in QFN12

MP28259 – 2A, 4.2V-20V INPUT, FAST TRANSIENT SYNCHRONOUS STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS
V_IN = 12V, T_A = 25°C, unless otherwise noted.
Parameters
Symbol Condition
Supply current (shutdown)
Supply current (quiescent)
HS switch-on resistance
LS switch On-resistance
Switch leakage
Current limit ⁽⁵⁾
One-shot on time
Minimum off time
Fold-back off time
OCP hold-off time
Feedback toltage
Feedback current
Soft-start time
EN rising threshold
EN threshold hysteresis
EN input current
Power-good rising threshold
Power-good falling threshold
Power-good delay
I_IN
I_IN
HS_RDS-ON
LS_RDS-ON
SW_LKG
I_LIMIT
T_ON
T_OFF
T_FB
T_OC
V_FB
I_FB
T_SS
EN_Vth-Hi
EN_Vth-Hys
IEN
PG_Vth-Hi
PG_Vth-Lo
PGTd
V_EN = 0V
V_EN = 2V, V_FB = 0.9V
V_EN = 0V, V_SW = 0V or
12V
After soft-start time-out
R₇ = 300kΩ, V_OUT = 1.2V
I_LIM = 1
I_LIM = 1
T_A = 25°C
T_A = -40°C to 85°C
V_FB = 800mV
V_EN = 2V
V_EN = 0V
Power-good sink current
capability
V_PG
Sink 4mA
Power-good leakage current
VIN under-voltage lockout
Threshold Rising
I_{PG_LEAK}
INUV_Vth
V_PG = 3.3V
VIN under-voltage lockout
threshold hysteresis
INUV_HYS
Thermal shutdown
Thermal shutdown hysteresis
T_SD
T_SD-HYS
Note:
5) Guaranteed by design.
Min
3
807
803
1.05
Typ
0
360
130
80
0
4
250
220
4.5
50
815
10
1
1.35
500
2
0
0.9
0.85
0.5
300
150
25
Max Units
μA
μA
mΩ
mΩ
10
μA
A
ns
ns
μs
μs
823
mV
827
mV
50
nA
ms
1.6
V
mV
μA
V_FB
V_FB
ms
0.4
V
10
nA
3.1
V
mV
°C
°C
MP28259 Rev. 1.34
www.MonolithicPower.com
3
4/27/2012
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