MD3221N Просмотр технического описания (PDF) - Shindengen
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MD3221N Datasheet PDF : 26 Pages
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2 Outline
The MD3221N is a non-insulated DC-DC converter
power IC incorporating a dedicated main switch
MOSFET and a synchronous rectification MOSFET.
Integration of a control IC and a power device in a
single chip minimizes the effects of wiring and
simplifies large-current power supply circuit design.
The PWM-controlled output voltage may be set
over a wide range of 0.8V to 14V, and 2.5V / 3.3V may
be set without the use of an external resistor. A
wide range of input voltages (4.5V to 20V) are
possible, and 5V input and battery input are also
accommodated. An over-current protection circuit is
incorporated to detect voltage drop with the ON
resistance of the internal MOSFET and thus provide
a simple DC-DC converter of high efficiency. The
oscillation frequency is selected from the 100kHz or
300kHz set internally, not only reducing the number
of external components required, but also facilitating
flexible design in applications. A surface mount
S/SOP32 package is used to ensure a small and thin
power supply circuit.
◆Features
□ Input voltage range of 4.5V to 20V.
□ Adjustable output voltage range of 0.8V to 14V.
□ Internal power MOSFET
□ High efficiency of 96% (Vi=5V, Vo=3.3V, Io=1A)
□ Over-Current protection function (external resistor not required)
□ Over temperature protection function
□ Remote ON / OFF function
(current consumption at OFF : Typ . 25μA)
□ Switching frequency of 100kHz or 300kHz
(external C.R not required)
□ The L Cut (Cut off derect) function
□ Ambient temperature range: −30℃ to 85℃
◆Product Code
MD3221N 4072
Specification code
Product name
◆Standard Connection Diagram
● Basic Circuit
Wiring for 3.3V output
+Vi
+
G
7
24
Vboot
VB
18~21 VDD
VOUT 11~14
6 VCC
32 S/S
MD3221N
OCL+ 25
OCL- 27
1 R/C
ampOUT 28
amp- 29
5 LC
Vref
2
ampIN 30
2.5V/3.3V 31
OSC GND P.GND1 P.GND2
3 4,26 8 16
+V0
+
G
3
Efficiency and circuit loss characteristics
5V input, 3.3V output
100
2
90
1.8
80
1.6
70
1.4
60
1.2
50
1
40
0.8
30
0.6
20
0.4
10
0.2
0
0
0
0.5
1
1.5
2
2.5
3
Output current Io [A]
※ f=300kHz
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