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MIC2245 bảng dữ liệu(PDF) 3 Page - Micrel Semiconductor

tên linh kiện MIC2245
Giải thích chi tiết về linh kiện  4MHz PWM Synchronous Buck Regulator with LDO Standby Mode
PDF  14 Pages
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nhà sản xuất  MICREL [Micrel Semiconductor]
Trang chủ  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC2245 bảng dữ liệu(HTML) 3 Page - Micrel Semiconductor

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Micrel, Inc.
MIC2245
January 2006
3
M9999-012406
www.micrel.com
Absolute Maximum Ratings
(1)
Supply Voltage (VIN) ............................................ +6V
Output Switch Voltage (VSW) ............................... +6V
Output Switch Current (ISW) ................................... 2A
Logic Input Voltage (VEN,VLOWQ) .............. -0.3V to VIN
Storage Temperature (Ts)................ -60°C to +150°C
ESD Rating
(3) ....................................................... 3kV
Operating Ratings
(2)
Supply Voltage (VIN)............................+2.7V to +5.5V
Logic Input Voltage (VEN,VLOWQ) .............. -0.3V to VIN
Junction Temperature (TJ) .............. –40°C to +125°C
Junction Thermal Resistance
3x3 MLF-10L (θJA)................................... 60°C/W
Electrical Characteristics
(4)
VIN = VEN = VLOWQ =3.6V; L = 1.0µH; COUT = 4.7µF; TA = 25°C, unless noted. Bold values indicate –40°C< TJ < +125°C
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, PWM
mode
VFB = 0.9 * VNOM (not switching)
710
900
µA
Quiescent Current, LDO
mode
VLOWQ = 0V;IOUT = 0mA
20
29
µA
Shutdown Current
VEN = 0V
0.01
5
µA
[Adjustable] Feedback
Voltage
± 2% (over temperature)
0.98
1
1.02
V
FB pin input current
1
nA
Current Limit in PWM Mode
VFB = 0.9 * VNOM
0.675
1
1.85
A
Output Voltage Line
Regulation
VOUT > 2V; VIN = VOUT+300mV to 5.5V; ILOAD= 100mA
VOUT < 2V; VIN = 2.7V to 5.5V; ILOAD= 100mA
0.13
%
Output Voltage Load
Regulation, PWM Mode
20mA < ILOAD < 300mA
0.2
0.8
%
Output Voltage Load
Regulation, LDO Mode
100µA < ILOAD < 50mA
VLOWQ = 0V
0.5
1
%
Maximum Duty Cycle
VFB ≤ 0.4V
100
%
PWM Switch ON-
Resistance
ISW = 50mA VFB = 0.7VFB_NOM (High Side Switch)
ISW = -50mA VFB = 1.1VFB_NOM (Low Side Switch)
0.4
0.4
Ω
Oscillator Frequency
3.6
4
4.4
MHz
LOWQ threshold voltage
0.5
0.85
1.3
V
LOWQ Input Current
0.1
2
µA
Enable Threshold
0.5
0.85
1.3
V
Enable Input Current
0.1
2
µA
LDO Dropout Voltage
IOUT = 50mA Note 5
110
mV



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