MIC5157BM Micrel Inc, MIC5157BM Datasheet - Page 6

• Manufacturer Part Number: MIC5157BM
• Description: IC CTRLR LDO REG SELECTBL 14SOIC
• Manufacturer: Micrel Inc
• Type: Positive Fixedr

Specifications of MIC5157BM

• Number Of Outputs: 1
• Voltage - Output: 3.3V, 5V, 12V
• Current - Supply: 4.5mA
• Voltage - Input: 3 ~ 36 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

MIC5156/5157/5158
Block Diagram MIC5156
Block Diagram MIC5157
MIC5156/5157/5158
Switched
5V Load
+5V Input
12k
Q2
F L A G
F L A G
Oscillator
Fixed 3.3V Power Supply with 5.0V Load Switch
C1+ C1– C2+ C2–
V
Comparator
V
Comparator
0.1µF
Block Diagram with External Components
Block Diagram with External Components
OU T
OU T
Charge Pump
Reference
Reference
C1
Bandgap
Bandgap
1.235V
1.235V
75mV
75mV
Fixed 3.3V 10A Power Supply
Tripler
0.1µF
0.1µF
Error
Error
Amp
Amp
* fixed version only
†
‡
3.3V = 17k, 5V = 32k
adjustable version only
C2
+12V Input
V
V
C P
P
6
C3
Clamp
1µF
V
C P
I
Comparator
I
Comparator
LIMIT
LIMIT
17k
10k
58k
15k
17k
10k
Internal
Bias
Internal
Bias
internal blocks
i nternal blocks
†
+5V Input
+5V Input
V
V
to all
to all
35mV
35mV
16.6V
DD
16.6V
DD
[ I
S* (Source)
GND
E A
E N
D (Drain)
G (Gate)
E N
D (Drain)
[ I
G (Gate)
S (Source)*
5V
3.3V
GND
LIMIT
LIMIT
‡
Enable
Shutdown
Enable
Shutdown
]
]
C
L
C
L
IRFZ44
R
3mΩ
Q1
SMP60N03-10L
Regulated
+3.3V Output
R
3mΩ
Q1
Regulated
+3.3V Output
S
S
August 2005
Micrel, Inc.