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MIC2225 Datasheet(PDF) 4 Page - Micrel Semiconductor

Part No. MIC2225
Description  2MHz 600mA Synchronous Buck Regulator with 300mA LDO
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Maker  MICREL [Micrel Semiconductor]
Homepage  http://www.micrel.com
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MIC2225 Datasheet(HTML) 4 Page - Micrel Semiconductor

 
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Micrel, Inc.
MIC2225
February 2008
4
M9999-022008-D
Absolute Maximum Ratings
(1)
Supply Voltage (VIN).......................................................+6V
Output Switch Voltage (VSW) ..........................................+6V
Output Switch Current (ISW)..............................................1A
Logic Input Voltage (VEN,VLOWQ)........................ –0.3V to VIN
Storage Temperature (Ts) .........................–60°C to +150°C
ESD Rating
(3).................................................................. 2kV
Operating Ratings
(2)
Supply Voltage (VIN)..................................... +2.7V to +5.5V
Logic Input Voltage (VEN,VLOWQ)........................ –0.3V to VIN
Junction Temperature (TJ) ........................–40°C to +125°C
Junction Thermal Resistance
Thin MLF-10L (
θJA) ............................................90°C/W
Electrical Characteristics DC/DC
(4)
VEN = VIN = 3.6V, L = 2.2µH; COUTDC/DC = 2.2µF, CLDO = 2.2µF; IOUTDC/DC = 100mA; CBIAS = 0.1µF
VENLDO = 0V; TJ = 25°C, bold values indicate –40°C < TJ < +125°C; unless noted.
Parameter
Condition
Min
Typ
Max
Units
UVLO Threshold
Rising input voltage during turn-on
2.45
2.55
2.65
V
UVLO Hysteresis
70
mV
Switcher Ground Pin Current
ENLDO = 0V, VFB = GND ; IL=0mA
850
1100
µA
LDO Ground Pin Current
EN = 0V
67
110
µA
Ground Pin Current in
Shutdown
EN +ENLDO = 0V
0.2
5
µA
Over-temperature Shutdown
160
°C
Over-temperature Shutdown
Hysteresis
23
°C
Logic Low
0.2
V
Enable Input Voltage
Logic High
1.0
V
VIL < 0.2V
0.1
1
µA
Enable Input Current
VIH > 1.0V
0.1
1
µA
Turn-on Time
ILOAD = 5mA
50
µs
Fixed Output Voltages
Nominal VOUT tolerance Io=50mA
–2
–3
+2
+3
%
%
Current Limit in PWM Mode
VFB = 0.9*VNOM
0.675
0.95
A
Output Voltage Line Regulation
VIN = 2.7V to 5.5V, ILOAD= 100mA
0.12
1
%
%
Output Voltage Load Regulation
20mA < ILOAD < 300mA
0.2
1.5
%
Maximum Duty Cycle
VFB ≤ 0.4V
100
%
PWM Switch ON-Resistance
ISW = 150mA; VFB = 0.7VFB_NOM
ISW = -150mA; VFB = 1.1VFB_NOM
0.4
0.4
Oscillator Frequency
1.8
2
2.2
MHz


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