Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI
LDO with a latchup release function MM1897 Series
LDO with a latchup release function
Monolithic IC MM1897 Series
Outline
Package
DIP-8D
Applications
1. Play equipment
2. Industrial equipment
3. Weather observation equipment
4. Outdoor equipment
This IC is a features a built-in latch-up release function (patent pending) with (1) Latch-up detection (2)
Power source shut-off (3) Latch-up release (4) Automatic recovery sequence, which helps to prevent
damage to micro-computers caused by latch-up. The use of bi-polar processing and a noise suppression
element result in a design that makes it diffi cult for the IC itself to cause damage due to latch-up or static
electricity. Results of static electricity noise/electric eld noise/magnetic eld noise tests that comply with
IEC61000-4-2 (Electrostatic Discharge Immunity Tests) have show a much better ability to withstand noise
than Mitsumi's previous products.
Features
1. Latch-up Release Function
(current detection threshold, detection delay time and recovery delay time can be set)
2. Resilient against noise
(IEC61000-4-2 Contact Discharge Test immunity 25kV)
3. Wide operating voltage range
(maximum operating voltage 14V)
Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.
The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI
LDO with a latchup release function MM1897 Series
Block Diagram
VOUT
R_Lat
V
O_D
EN2
GND CD
CR
V
in
Vin_D
Vin
Vin
Vin
EN3
TSD
GND
Thermal
Shutdown
Vref
Iref
Vref
Iref
Discharge Tr
Detection
Current Tr
PWTr
Vref_xx
Vref_D
EN3
V
in
Vin
Vin
Vin
Vref_R
Vref_out
Vref_REG
Vref_Latch
FB
EN3
EN2
TSD
REG_CONT
EN3
Set Q
Reset
RS_FF
I_LAT_DET
I_LAT_DET
I_LAT_DET_COMP
LOGIC CONT
V
OUT_COMP
V
OUT_COMP
CR_COMP
V
OUT_COMP
REG_CONT
CD_COMP
CD_COMP
CR_COMP
Pin Assignment
12 34
87 65
DIP-8D
(TOP VIEW)
1 
2 
3 
4 
5

6 
7

8 
Pin Description
Pin No. Pin name Functions
1
 ���
2  
3  
4 

5  
6
 
7
 
8  