MIC5156 Micrel Semiconductor, MIC5156 Datasheet - Page 6

• Manufacturer Part Number: MIC5156
• Description: Super LDO Regulator Controller
• Manufacturer: Micrel Semiconductor

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