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參數(shù)資料
| 型號： | MD1332F |
| 廠商： | Shindengen Electric Manufacturing Company, Ltd. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | High-Efficiency Step Down DC-DC Converter Power Integrated Circuit |
| 中文描述： | 高效率下降的DC升壓DC轉(zhuǎn)換器電源集成電路 |
| 文件頁數(shù)： | 1/2頁 |
| 文件大?。?/td> | 29K |
| 代理商： | MD1332F |
1
-
8
0
0
-
6
3
4
-
3
6
5
4
2.5V to 12V
Output MD1322F
Company Name
Type No.
Lot No.
28
15
TAB2
TAB1
14
1
8
+
0
1
+
–
0
SHINDENGEN
MD1322F
5030N
PIN AS S IGNMENT
DES CRIPT ION
The MD1322F is a high-efficiency step down DC-DC converter
power integrated circuit with main MOSFET switch and Schottky
Barrier Diode. The MD1322F can deliver 7.5 watts maximum
(5V, 3.0A) with high efficiency over a wide input voltage range.
This device has output voltage digitally selectable from 2.5V to 12V.
With the MD1322F you can construct a complete DC-DC converter
using only a few external components. Featuring an HSOP 28-pin
surface mount package, the MD1322F allows you to incorporate
a very small and thin power supply on your circuit board.
Vref
26
5
Vcc
Vboot
6
VB
23
VG
22
TAB2
TAB1
VOUT
8-11
4.24
28
OCL-
STOP=6.7V
BOOT Reference
Vref=6.5V
Driver
Vref=Vout+5.8V
Reference
TSD
MOS OFF
driver
100
C
Error amp
-
+
PWM comp
+
-
-
+
f=OSC
3V
1V
CLM Vth=
0.1~0.2V
V
DD
P.GND
GND
OCL+
S/S
ampOUT
amp-
27
3
1
2
2.45V
150
C
R
S
Q
Pin# S ymbol Func tion desc ription
1
2
3
4
5
6
7
8 ~ 11
12 ~ 21
22
23
24
25
26
27
28
TAB1
TAB2
S/S
OCL-
OCL+
GND
Vcc
Vboot
N/C
P.GND
N/C
VG
VB
GND
VTS
Vref
AmpOUT
amp-
VOUT
VDD
Capacitor for softstart
Overcurrent protection (OCL) (-)
Overcurrent protection (OCL) (+)
Signal GND
Input voltage
High side drive supply for main MOS
Non-connection
Power GND
Non-connection
Gate terminal of main MOS
Bootstrap capacitor between VB and VOUT
Signal GND
Output voltage selectable terminal
Internal voltage reference
Error Amp out
Error Amp (-) input
Power stage output
Drain of main MOS Switch
VOUT:TAB1
S/S: 1
OCL-: 2
OCL+: 3
GND: 4
Vcc: 5
Vboot: 6
N/C: 7
TAB2:V
DD
P.GND: 8
P.GND: 9
P.GND: 10
P.GND: 11
N/C: 12
N/C: 13
N/C: 14
28: amp-
27: ampOUT
26: Vref:
25: VTS
24: GND
23: VB
22: VG
21: N/C
20: N/C
19: N/C
18: N/C
17: N/C
16: N/C
15: N/C
I
Vref
- Temperature compensated internal voltage. You can pull 1mA
maximum for external circuit.
I
OSC
- Uses internal oscillator without external component.
Frequency (Saw tooth wave form) is trimmed to 250kHz on chip.
I
Error Amp
- Error Amp detects output voltage of DC-DC converter
and controls PWM signal. You can adjust the loop gain when you
connect feedback resistor and capacitor between AmpOUT and
Amp (-). It will provide stable phase compensation.
I
Overcurrent protection
- Uses pulse-by-pulse current
protection. Current will be sensed voltage drop of external current
sensing resistor. Threshold of OCL is 0.19V.
BLOCK DIAGRAM
FEAT URES
I
High efficiency
I
Wide input voltage load range
8VDC to 30VDC
Up to 3ADC
I
Output voltage selectable function
2.5V to 12V
I
Internal Switching power device
Main MOSFET for switch
SBD for rectification
I
Fixed 250kHz PWM frequency
Without external resistor and capacitor
I
Overcurrent protection
I
Thermal shutdown function
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