參數(shù)資料
型號(hào)： MIC2205
廠商： Micrel Semiconductor,Inc.
英文描述： 2MHz PWM Synchronous Buck Regulator with LDO Standby Mode
中文描述： 2MHz的PWM同步降壓穩(wěn)壓器與LDO的待機(jī)模式
文件頁數(shù)： 3/16頁
文件大?。?/td> 453K
代理商： MIC2205
Micrel, Inc.
MIC2205
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ............................................ +6V
Output Switch Voltage (V
SW
) ............................... +6V
Output Switch Current (I
SW
)................................... 2A
Logic Input Voltage (V
EN
,V
LOWQ
).............. -0.3V to V
IN
Storage Temperature (T
s
)................ -60°C to +150°C
ESD Rating
(3)
.......................................................
3kV
April 2005
3
M9999-041105
www.micrel.com
Operating Ratings
(2)
Supply Voltage (V
IN
)............................+2.7V to +5.5V
Logic Input Voltage (V
EN
,V
LOWQ
) ..............-0.3V to V
IN
Junction Temperature (T
J
).............. –40°C to +125°C
Junction Thermal Resistance
3x3 MLF-10L (
θ
JA
)...................................60°C/W
Electrical Characteristics
(4)
V
IN
= V
EN
= V
LOWQ
=3.6V; L = 2.2
μ
H; C
OUT
= 2.2
μ
F; T
A
= 25°C, unless noted.
Bold
values indicate –40°C< T
J
< +125°C
Parameter
Condition
Supply Voltage Range
Under-Voltage Lockout
Threshold
UVLO Hysteresis
Quiescent Current, PWM
mode
Quiescent Current, LDO
mode
Shutdown Current
V
EN
= 0V
±
1%
±
2% (over temperature)
Min
2.7
2.45
Typ
2.55
Max
5.5
2.65
Units
V
V
(turn-on)
100
690
mV
μA
V
FB
= 0.9 * V
NOM
(not switching)
900
V
LOWQ
= 0V;I
OUT
= 0mA
16
29
μA
0.01
1
5
μA
[Adjustable] Feedback
Voltage
0.99
0.98
1.01
1.02
V
[Fixed Output] Voltages
Nominal V
OUT
tolerance
-1
-2
0.75
+1
+2
1.85
%
FB pin input current
Current Limit in PWM Mode
Output Voltage Line
Regulation
Output Voltage Load
Regulation, PWM Mode
Output Voltage Load
Regulation, LDO Mode
V
FB
= 0.9 * V
NOM
V
OUT
> 2V; V
IN
= V
OUT
+300mV to 5.5V; I
LOAD
= 100mA
V
OUT
< 2V; V
IN
= 2.7V to 5.5V; I
LOAD
= 100mA
20mA < I
LOAD
< 300mA
1
1
nA
A
%
0.13
0.2
0.5
%
100
μ
A < I
LOAD
< 50mA
V
LOWQ
= 0V
V
FB
≤
0.4V
I
SW
= 50mA V
FB
= 0.7V
FB_NOM
(High Side Switch)
I
SW
= -50mA V
FB
= 1.1V
FB_NOM
(Low Side Switch)
0.1
0.2
%
Maximum Duty Cycle
100
%
PWM Switch ON-
Resistance
0.4
0.4
2
Oscillator Frequency
1.8
2.2
MHz
LOWQ threshold voltage
0.5
0.85
1.3
V
LOWQ Input Current
Enable Threshold
Enable Input Current
LDO Dropout Voltage
I
OUT
= 50mA
Note 5
0.1
0.85
0.1
110
2
μA
V
μA
mV
0.5
1.3
2
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