MIC2224 Datasheet, PDF (3/13 Pages) Micrel Semiconductor – High Efficiency 2MHz PWM Buck Converter with DAC Input and 40mOHM Bypass Switch

Micrel
MIC2224
Absolute Maximum Rating (Note 1)
Supply Voltage (V_IN) ..................................... 0V to 6V
Output Switch Voltage (V_SW) ................................. 6V
DAC Input Voltage (V_DAC) ................... 0V to V_in+0.3V
Output Switch Current (I_SW) ................................ 2.5A
Logic Input Voltage (V_EN).................... 0V to V_IN+0.3V
Storage Temperature (T_S) ............... -65°C to +150°C
Operating Ratings
Supply Voltage (V_IN)................................2.7V to 5.5V
Output Voltage (V_OUT) ................................0V to 5.5V
DAC Input Voltage (V_DAC) ......................... 0.1V to V_in
Junction Temperature Range (T_J) .. -40°C to +125°C
Thermal Resistance
θ_JA MLF .................................................... 60°C/W
Electrical Characteristics ⁽⁴⁾
V_IN = V_EN = 3.6V;V_DAC=0.6V; L = 4.7µH; C_OUT = 1µF; T_A = 25°C, unless noted. Bold values indicate –40°C< T_J < +125°C
Parameter
Condition
Min
Typ Max
Supply Voltage Range
2.7
5.5
Total Quiescent Current
V_DAC = 0.6V V_OUT = 2.4V
(regulator on, not switching)
360 450
Shutdown Current
Maximum Duty Cycle
V_EN = 0V (regulator off)
1
5
100
Regulation
Output Voltage
Output Voltage Line Regulation
Output Voltage Load Regulation
Output
V_DAC = 0.6V, I_LOAD =0mA
3.0V ≤ V_IN ≤ 4.5, I_LOAD= 10mA
0mA < I_OUT < 500mA
1.746 1.8 1.854
0.05 0.5
0.2
Switch On-Resistance
Current limit (Peak SW Current)
I_SW = -100mA, High-Side Switch
I_SW = 100mA , Low-Side Switch
0.55 0.75
0.6 0.85
0.65 0.85 1.6
Oscillator
Frequency
1.8
2
2.2
Enable / UVLO
Enable Pin Threshold
0.5
0.9
1.3
Enable Pin Hysteresis
30
Enable Pin Input Current
0.01
1
EN high to 90% V_OUT
Under-Voltage Lockout Threshold
(turn-on)
25
50
2.6
2.7
UVLO Hysteresis
85
DAC Input
DAC Input Current
0.15
2
Output Voltage/DAC Voltage
(internally set)
3
Units
V
µA
µA
%
V
%/V
%
Ω
A
MHz
V
mV
µA
µs
V
mV
µA
V/V
January 2005
3
M9999-012705
www.micrel.com