MD3221R Shindengen Electric Manufacturing Co.,Ltd, MD3221R Datasheet
MD3221R
Manufacturer Part Number
MD3221R
Description
Step Down Dc - Dc Converter Power Ic
Manufacturer
Shindengen Electric Manufacturing Co.,Ltd
Datasheet
1.MD3221R.pdf
(2 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MD3221R
Manufacturer:
SHINDENG
Quantity:
20 000
U097−2
Step Down DC - DC Converter Power IC
MD3221R
Feature
Block Diagram
Standard Connection Diagram
4.5∼20V
GND
wiring for f=300kHz
INPUT
（L.Active）
ampOUT
amp-
R/C
S/S
＋
14
13
11
12
GND
ON
9,17
V
Input Voltage range 4.5V to 20V
Maximum Output Current 3A
Built_in MOSFETs for main switch and synchronous rectification
Adjustable output from 0.8V to 14V with external resistors
High Efficiency typ. 96% ( at:Vin=5V, Vout=3.3V, Iout=1A, f=100kHz )
100kHz / 300kHz selectable switching frequency
Error Amp
ref
−
＋
ON/OFF
Control
3∼6
18
14
13
15
OSC
OSC
16
MD3221R
19
16
＋
＋
−
1.26V±1％
Reference
V
Bandgap
＋
−
CC
20
PWM Comp
V
18
cc
−
＋
9,17 26
UVLO
8
1,2,22∼25
S R Q
Latch
10
12
11
Shutdown
Thermal
VTS
10
＋
−
Current
Limit2
0.8∼14V
OUTPUT
S R Q
Q R S
footprint
＋
−
GND
Latch
Latch
7
Small
V
15
ref
Current
Limit1
Pin Assignment ( LSSOP26 )
＋
−
adjustable
(See the marking specification for the indication on the device)
＋
−
Output
ampOUT
amp-
V
V
GND
VTS
V
V
V
V
V
S/S
OUT
OUT
DD
DD
DD
DD
GH
V
B
Over Current Protection
Under Voltage Lockout
Thermal Shut Down
Remote On / Off
Supply current at remote off 25μA typ.
10
11
12
13
1
2
3
4
5
6
7
8
9
Remote
On/Off
P.GND1
V
boot
19
20
INVL
V
8
B
Synchronous
Rectification
V
7
GH
V
21
GL
P.GND2
V
3∼6
26
26
25
24
23
22
21
20
19
18
17
16
15
14
DD
5V Input
1,2,22∼25
P.GND2
V
V
V
V
V
P.GND1
V
V
GND
OSC
Vref
R/C
OUT
OUT
OUT
OUT
GL
boot
CC
V
OUT
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MD3221R Summary of contents
Page 1
... Error Amp amp- − 12 ＋ OSC 9,17 16 OSC GND Standard Connection Diagram wiring for f=300kHz 19 INPUT 4.5∼20V 3∼6 18 MD3221R 14 ＋ GND U097−2 Small footprint ref 18 15 ＋ − Thermal Shutdown − Current ＋ ...
Page 2
... Vcc＝5V Itimer Vcc＝ Vcc＝5V / Vth ＿ lat Vcc＝5V V ＿ Vcc＝4.5V to 20V 0.784 ＿ TSD − 8 MD3221R Unless otherwise specified : Ta=25ºC Units ℃ ℃ ℃ ℃ ℃ ℃ ...