MIC2224_06 Datasheet, PDF (3/13 Pages) Micrel Semiconductor – High Efficiency 2MHz PWM Buck Converter with DAC Input and 40mΩ Bypass Switch

Micrel, Inc.
Absolute Maximum Ratings⁽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
MIC2224
Operating Ratings⁽²⁾
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 (T_J) ........................ –40°C to +125°C
Thermal Resistance
MLF^®-10 (θ_JA) ....................................................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, bold values indicate –40°C< T_J < +125°C, unless noted.
Parameter
Condition
Min Typ Max Units
Supply Voltage Range
2.7
5.5
V
Total Quiescent Current
VDAC = 0.6V VOUT = 2.4V (regulator on, not switching)
360
450
µA
Shutdown Current
VEN = 0V (regulator off)
1
5
µA
Maximum Duty Cycle
100
%
Regulation
Output Voltage
VDAC = 0.6V, ILOAD =0mA
1.746 1.8 1.854
V
Output Voltage Line Regulation
3.0V ≤ VIN ≤ 4.5, ILOAD= 10mA
0.05
0.5
%/V
Output Voltage Load Regulation 0mA < IOUT < 500mA
0.2
%
Output
Switch On-Resistance
ISW = -100mA, High-Side Switch
ISW = 100mA , Low-Side Switch
0.55 0.75
Ω
0.6
0.85
Ω
Current limit (Peak SW Current)
0.65 0.85
1.6
A
Oscillator
Frequency
1.8
2
2.2
MHz
Enable / UVLO
Enable Pin Threshold
0.5
0.9
1.3
V
Enable Pin Hysteresis
30
mV
Enable Pin Input Current
0.01
1
µA
EN high to 90% VOUT
25
50
µs
Under-Voltage Lockout Threshold (turn-on)
2.6
2.7
V
UVLO Hysteresis
85
mV
DAC Input
DAC Input Current
0.15
2
µA
Output Voltage/DAC Voltage
(internally set)
3
V/V
Bypass Switch
Bypass Switch Threshold
1.176 1.2 1.224
V
Bypass Switch Hysteresis
35
mV
Bypass Transition Time
10
µs
Bypass Switch On-Resistance
40
mΩ
Bypass Switch Leakage
5
µA
Bypass Over-Current Limit
1
1.4
2.5
A
Current Limit Retry Time
32
µs
Current Limit Retry Duty Cycle
12.5
%
September 2006
3
M9999-091106