MIC22400 Datasheet, PDF (4/19 Pages) Micrel Semiconductor – 4A Integrated Switch Synchronous Buck Regulator with Frequency Programmable up to 4MHz

Micrel, Inc.
MIC22400
Absolute Maximum Ratings⁽¹⁾
Supply Voltage (V_IN) .........................................................6V
Output Switch Voltage (V_SW) ............................................6V
Output Switch Current (I_SW)..............................................6A
Logic Input Voltage (V_EN, V_LQ)........................... V_IN to –0.3V
Storage Temperature (T_s) .........................–65°C to +150°C
ESD Rating⁽³⁾.................................................................. 2kV
Operating Ratings⁽²⁾
Supply Voltage (V_IN)......................................... 2.6V to 5.5V
Junction Temperature (T_J) ..................–40°C ≤ T_J ≤ +125°C
Thermal Resistance
3x4 MLF-20 (θ_JA) ...............................................45°C/W
e-TSSOP-20 (θ_JA) ...........................................32.2°C/W
Electrical Characteristics⁽⁴⁾
T_A = 25°C with V_IN = V_EN = 3.3V; V_OUT = 1.2V, C_OSC = 400pF, unless otherwise specified. Bold values indicate
–40°C< T_J < +125°C.
Parameter
Condition
Min Typ Max
Supply Voltage Range
2.6
5.5
Under-Voltage Lockout Threshold
(turn-on)
2.4
2.5
2.6
UVLO Hysteresis
280
Quiescent Current, PWM Mode
Shutdown Current
[Adjustable] Feedback Voltage
V_EN =>1.34V; V_FB = 0.9V (not switching)
V_EN = 0V
± 1%
± 2% (over temperature)
1.3
2.0
5
10
0.693 0.7
0.686
0.707
0.714
Oscillator Current
320 400
480
FB Pin Input Current
1
100
Current Limit in PWM Mode
Output Voltage Line Regulation
Output Voltage Load Regulation
Maximum Duty Cycle
Switch ON-Resistance PFET
Switch ON-Resistance NFET
Oscillator Frequency
V_FB = 0.5V
V_OUT 1.2V; V_IN = 2.6 to 5.5V, I_LOAD= 100mA
100mA < I_LOAD < 4000mA, V_IN = 3.3V
V_FB ≤ 0.5V
I_SW = 1000mA; V_FB=0.5V
I_SW = 1000mA; V_FB=0.9V
4.4
6
7.5
0.2
0.2
100
0.060
0.035
0.8
1
1.2
EN/DLY Threshold Voltage
1.14 1.24 1.34
EN/DLY Source Current
RC Pin I_RAMP
Power On Reset I_PG(LEAK)
V_IN = 2.6 to V_IN = 5.5V
Ramp Control Current
V_PORH = 5.5V; POR = High
0.7
1
1.3
0.7
1
1.3
1
2
Power On Reset V_PG(LO)
Power On Reset V_PG
Output Logic-Low Voltage (undervoltage condition),
I_POR = 5mA
Threshold, % of V_OUT below nominal
Hysteresis
135
7.5
10
12.5
2.7
Over-Temperature Shutdown
150
Over-Temperature Shutdown
10
Hysteresis
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended.
4. Specification for packaged product only.
Units
V
V
mV
mA
µA
V
V
µA
nA
A
%
%
%
Ω
Ω
MHz
V
µA
µA
µA
µA
mV
%
%
°C
°C
February 2008
4
M9999-022108-A