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MIC23051 Datasheet, PDF (3/13 Pages) Micrel Semiconductor – 4MHz PWM Buck Regulator 4MHz PWM Buck Regulator and Voltage Scaling
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Micrel, Inc.
MIC23051
Absolute Maximum Ratings(1)
Supply Voltage (VIN) .........................................................6V
Output Switch Voltage (VSW) ............................................6V
Output Switch Current (ISW)..............................................2A
Logic Input Voltage (VEN, VLQ)........................... VIN to –0.3V
Storage Temperature Range (Ts)..............–65°C to +150°C
ESD Rating(3).................................................................. 3kV
Operating Ratings(2)
Supply Voltage (VIN)......................................... 2.7V to 5.5V
Logic Input Voltage (VEN).................................... -0.3V to VIN
Junction Temperature (TJ) ..................–40°C ≤ TJ ≤ +125°C
Thermal Resistance
2x2 MLF-8 (θJA) .................................................90°C/W
Electrical Characteristics(4)
TA = 25°C with VIN = VEN = VSC = 3.6V; L = 1µH; CFF = 560pF; COUT = 4.7µF; IOUT = 20mA unless otherwise specified.
Bold values indicate –40°C< TJ < +125°C. Important design targets are in italics.
Parameter
Condition
Min Typ Max Units
Supply Voltage Range
2.7
5.5
V
Under-Voltage Lockout Threshold (turn-on)
2.45 2.55 2.65
V
UVLO Hysteresis
100
mV
Quiescent Current,
Hyper LL mode
IOUT = 0mA , SNS > 1.8V
20
35
µA
Shutdown Current
Output Voltage Accuracy
VIN = 5.5V; VEN = 0V;
VSC High, VIN = 3.0V, ILOAD = 20mA
VSC Low, VIN = 3.0V, ILOAD = 20mA
0.01
4
µA
-2.5
+2.5
%
%
-2.5
+2.5
%
%
SNS pin input current
Current Limit in PWM Mode
Output Voltage Line Regulation
Output Voltage Load Regulation
Output Voltage Line Regulation
Output Voltage Load Regulation
Maximum Duty Cycle
PWM Switch ON-Resistance**
See Design Note
Frequency
SoftStart Time
VSC threshold voltage
VOUT = 1V
SNS = 0.9*VNOM
VIN = 3.0V to 5.5V, ILOAD = 20mA, VSC = 3.6V
20mA < ILOAD < 500mA, VSC = 3.6V
VIN = 3.0V to 5.5V, ILOAD = 20mA, VSC = 0V
20mA < ILOAD < 500mA, VSC = 0V
SNS ≤ VNOM, VOUT = 1.8V
ISW = 100mA PMOS
ISW = -100mA NMOS
VSC = 3.6V, ILOAD = 120mA
VSC = 0V, ILOAD = 120mA
VOUT = 90%
1
µA
0.65
1
1.7
A
0.5
%
0.3
%
0.5
%
0.3
%
80
89
%
0.45
Ω
0.5
Ω
3.4
4
4.6
MHz
3.4
4
4.6
MHz
650
µs
0.5
1.2
V
VSC hysteresis
20
mV
Output transition time
VSC from low to high
VSC from high to low
800
µs
800
Enable Threshold
(turn-on)
0.5
1.2
V
Enable Hysteresis
35
mV
Enable Input Current
0.1
2
µA
Over-temperature Shutdown
Over-temperature Shutdown
Hysteresis
165
°C
20
°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. Human body model, 1.5kΩ in series with 100pF.
4. Specification for packaged product only.
October 2007
3
M9999-101207-C
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