MIC2225 Datasheet, PDF (3/14 Pages) Micrel Semiconductor – 2MHz 600mA Synchronous Buck Regulator with 300mA LDO

Micrel, Inc.
MIC2225
Absolute Maximum Ratings⁽¹⁾
Supply Voltage (V_IN) .......................................................+6V
Output Switch Voltage (V_SW) ..........................................+6V
Output Switch Current (I_SW)..............................................1A
Logic Input Voltage (V_EN,V_LOWQ)........................ –0.3V to V_IN
Storage Temperature (T_s) .........................–60°C to +150°C
ESD Rating⁽³⁾.................................................................. 2kV
Operating Ratings⁽²⁾
Supply Voltage (V_IN)..................................... +2.7V to +5.5V
Logic Input Voltage (V_EN,V_LOWQ)........................ –0.3V to V_IN
Junction Temperature (T_J) ........................ –40°C to +125°C
Junction Thermal Resistance
Thin MLF-10L (θ_JA) ............................................90°C/W
Electrical Characteristics DC/DC⁽⁴⁾
V_EN = V_IN = 3.6V, L = 2.2µH; C_OUTDC/DC = 2.2µF, C_LDO = 2.2µF; I_OUTDC/DC = 100mA; C_BIAS = 0.1µF
V_ENLDO = 0V; T_J = 25°C, bold values indicate –40°C < T_J < +125°C; unless noted.
Parameter
Condition
Min Typ
UVLO Threshold
Rising input voltage during turn-on
2.45 2.55
UVLO Hysteresis
70
Switcher Ground Pin Current
ENLDO = 0V, V_FB = GND ; I_L=0mA
850
LDO Ground Pin Current
EN = 0V
67
Ground Pin Current in
Shutdown
Over-temperature Shutdown
Over-temperature Shutdown
Hysteresis
Enable Input Voltage
Enable Input Current
Turn-on Time
Fixed Output Voltages
EN +ENLDO = 0V
Logic Low
Logic High
V_IL < 0.2V
V_IH > 1.0V
I_LOAD = 5mA
Nominal V_OUT tolerance Io=50mA
0.2
160
23
1.0
0.1
0.1
50
–2
–3
Current Limit in PWM Mode
Output Voltage Line Regulation
V_FB = 0.9*V_NOM
V_IN = 2.7V to 5.5V, I_LOAD= 100mA
0.675 0.95
0.12
Output Voltage Load Regulation
Maximum Duty Cycle
PWM Switch ON-Resistance
Oscillator Frequency
20mA < I_LOAD < 300mA
V_FB ≤ 0.4V
I_SW = 150mA; V_FB = 0.7V_{FB_NOM}
I_SW = -150mA; V_FB = 1.1V_{FB_NOM}
0.2
100
0.4
0.4
1.8
2
Max
2.65
1100
110
5
0.2
1
1
+2
+3
1
1.5
2.2
Units
V
mV
µA
µA
µA
°C
°C
V
V
µA
µA
µs
%
%
A
%
%
%
%
Ω
Ω
MHz
October 2007
3
M9999-101107-B