MIC22400_10 Datasheet, PDF (4/28 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
Lead Temperature...................................................... 260°C
Storage Temperature (T_s) .........................–65°C to +150°C
ESD Rating.................................................................Note 3
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_F = 400pF, unless otherwise specified. Bold values indicate –40°C< T_J < +125°C.
Parameter
Condition
Min. Typ. Max. Units
Supply Voltage Range
2.6
5.5
V
Undervoltage Lockout Threshold
(turn-on)
2.4
2.5
2.6
V
UVLO Hysteresis
280
mV
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
mA
5
10
µA
0.693
0.686
0.7
0.707
0.714
V
V
Oscillator Frequency
0.8
1
1.2
MHz
FB Pin Input Current
1
nA
Current Limit
Output Voltage Line Regulation
Output Voltage Load Regulation
Maximum Duty Cycle
Switch ON-Resistance PFET
Switch ON-Resistance NFET
EN/DLY Threshold Voltage
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
7
10
A
0.2
%
0.2
%
100
%
0.060
Ω
0.035
Ω
1.14 1.24 1.34
V
EN/DLY Source Current
RC Pin I_RAMP
POR 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
µA
0.7
1
1.3
µA
1
µA
2
µA
POR V_PG(LO)
POR V_PG
Output Logic-Low Voltage (undervoltage condition),
I_POR = 5mA
Threshold, % of V_OUT below nominal
Hysteresis
135
mV
7.5
10
12.5
%
2.7
%
Over-Temperature Shutdown
150
°C
Over-Temperature Shutdown
Hysteresis
10
°C
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.
December 2010
4
M9999-120310-F