Step Down DC - DC Converter Power IC
MD1323R
Feature
Block Diagram
V
ref
11
Frequency
adjustable
Output adjustable
Small
footprint
Remote On/Off
Input Voltage range 8V to 30V
Maximum Output Current 1.8A
Included main switch MOSFET and fly wheel SBD
Adjustable output voltage from 2.5V to 12V with external resistors
Adjustable oscillation frequency from 100kHz to 500kHz
with external resistors
High Efficiency typ. 94%
(at:Vin=8V, Vout=5V, Iout=1A, f=100kHz)
Over Current Protection
Thermal Shut Down
Remote On / Off
V
cc
19
V
boot
20
V
B
8
V
G
7
V
DD
3∼6
R/C
18
ON/OFF
Control
UVLO
Start=7.2V
Stop=6.7V
BOOT
Vref=6.5V
150℃
HighSide
Vref=V
OUT
+5.8V
100℃
Bandgap
Reference
5.0V±5％
Error Amp
−
＋
HighSide
Driver
Main Switch
MOS OFF
TSD
V
OUT
PWM Comp
＋
−
3V
2.45V
1V
1,2,22∼25
OSC
R
Q
S
＋
−
P.GND
CLM Vth=
0.1∼0.2V
26
13
12
10
14
15
16
9,17
amp-
ampOUT
OSC
S/S OCL- OCL+
GND
※N/C：21
Standard Connection Diagram
Pin Assignment ( LSSOP26)
INPUT
8∼30V
3∼6
20
8
1,2,22∼25
16
OUTPUT
2.5∼12V
V
OUT
V
OUT
V
DD
V
DD
V
DD
V
DD
V
G
V
B
GND
OSC
Vref
ampOUT
amp-
1
26
2
3
4
5
6
7
8
9
10
11
12
13
25
24
23
22
21
20
19
18
17
16
15
14
19
MD1323R
18
15
13
＋
14
＋
12
11
ON
10
9,17
26
P.GND
V
OUT
V
OUT
V
OUT
V
OUT
N/C
V
boot
V
CC
R/C
GND
OCL+
OCL-
S/S
SHINDENGEN
MD1323R
P □□□□□
GND
GND
*Please consult with us when it is desired to make
output adjustable in a range over 5.3V.
(See
the marking specification for the indication on the device)
U097−2
17
SHINDENGEN [ SHINDENGEN ELECTRIC MFG.CO.LTD ]
