MIC5156 Datasheet, PDF (6/11 Pages) Micrel Semiconductor – Super LDO™ Regulator Controller

MIC5156/5157/5158
Block Diagram MIC5156
+12V Input
0.1µF
V_P
+5V Input
V_DD
Micrel
Internal
Bias
EN
Enable
Shutdown
R_S
3mΩ
12k
+5V Input
1.235V
Bandgap
Reference
to all
internal blocks
I_LIMIT
Comparator
35mV
D (Drain)
[I_LIMIT]
Switched
5V Load
Q2
FLAG
V_OUT
Comparator
Error
Amp
75mV
* fixed version only
† _{3.3V = 17k, 5V = 32k}
16.6V
17k^†
10k
G (Gate)
S* (Source)
Q1
SMP60N03-10L
Regulated
+3.3V Output
C_L
GND
‡ _{adjustable version only}
EA^‡
3
Block Diagram with External Components
Fixed 3.3V Power Supply with 5.0V Load Switch
Block Diagram MIC5157
0.1µF C1 0.1µF C2
C1+ C1– C2+ C2– V_CP
C3
1µF
+5V Input
V_DD
Oscillator
Charge Pump
Tripler
FLAG
1.235V
Bandgap
Reference
V_OUT
Comparator
Error
Amp
75mV
V_CP
Clamp
Internal
Bias
EN
Enable
Shutdown
R_S
3mΩ
to all
internal blocks
I_LIMIT
Comparator
35mV
D (Drain)
[I_LIMIT]
G (Gate)
16.6V
S (Source)*
58k
5V
C_L
15k
3.3V
Q1
IRFZ44
Regulated
+3.3V Output
17k
10k
GND
March 1999
Block Diagram with External Components
Fixed 3.3V 10A Power Supply
3-117