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MD1332F Schematic ( PDF Datasheet ) - Shindengen Electric

Teilenummer MD1332F
Beschreibung High-Efficiency Step Down DC-DC Converter Power Integrated Circuit
Hersteller Shindengen Electric
Logo Shindengen Electric Logo 




Gesamt 2 Seiten
MD1332F Datasheet, Funktion
2.5V to 12V Output MD1322F
28 TAB2 15
SHINDENGEN
MD1322F
5030N
1 TAB1
14
Company Name
Type No.
Lot No.
DESCRIPTION
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.
BLOCK DIAGRAM
Vref
26
Vcc
5
START UP
START=7.2V
STOP=6.7V
Vboot
6
BOOT Reference
Vref=6.5V
VB
23
Driver
Vref=Vout+5.8V
VG VDD
22 TAB2
Reference
Vref=5V±5%
Error amp
-
+
2.45V
TSD
100˚C
150˚C
Main Switch
MOS OFF
PWM comp
+
-
3V
1V
OSC
f=250kHz
Q
RS
+
-
CLM Vth=
0.1~0.2V
driver
28
amp-
27
ampOUT
1 23
4.24
S/S OCL- OCL+ GND
TAB1
VOUT
8-11
P.GND
FEATURES
s High efficiency
s Wide input voltage load range
8VDC to 30VDC
Up to 3ADC
s Output voltage selectable function
2.5V to 12V
s Internal Switching power device
Main MOSFET for switch
SBD for rectification
s Fixed 250kHz PWM frequency
Without external resistor and capacitor
s Overcurrent protection
s Thermal shutdown function
PIN ASSIGNMENT
S/S: 1
OCL-: 2
OCL+: 3
GND: 4
Vcc: 5
Vboot: 6
N/C: 7
28: amp-
27: ampOUT
26: Vref:
25: VTS
24: GND
23: VB
22: VG
VOUT:TAB1
TAB2:VDD
P.GND: 8
P.GND: 9
P.GND: 10
P.GND: 11
N/C: 12
N/C: 13
N/C: 14
21: N/C
20: N/C
19: N/C
18: N/C
17: N/C
16: N/C
15: N/C
s Vref - Temperature compensated internal voltage. You can pull 1mA
maximum for external circuit.
s OSC - Uses internal oscillator without external component.
Frequency (Saw tooth wave form) is trimmed to 250kHz on chip.
s 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.
s 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.
Pin#
1
2
3
4
5
6
7
8 ~ 11
12 ~ 21
22
23
24
25
26
27
28
TAB1
TAB2
Symbol
S/S
OCL-
OCL+
GND
Vcc
Vboot
N/C
P.GND
N/C
VG
VB
GND
VTS
Vref
AmpOUT
amp-
VOUT
VDD
Function description
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
1-800-634-3654





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