2.5V to 12V Output MD1322F
DESCRIPTION
Company Name 28 TAB2 15 Type No.
The MD1322F is a high-efficiency step down DC-DC...
2.5V to 12V Output MD1322F
DESCRIPTION
Company Name 28 TAB2 15 Type No.
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
SHINDENGEN MD1322F 5030N
1 TAB1 14
– 0.3 12.23 +
– 0.1 8.8 +
Lot No.
surface mount package, the MD1322F allows you to incorporate a very small and thin power supply on your circuit board.
BLOCK DIAGRAM
Vref
26
FEATURES
Vboot
6
Vcc
5
VB
23
VG
22
VDD
TAB2
s High efficiency s Wide input
voltage load range 8VDC to 30VDC Up to 3ADC s Output
voltage selectable function
START UP START=7.2V STOP=6.7V
BOOT Reference Vref=6.5V
Driver Vref=Vout+5.8V
Reference Vref=5V±5%
TSD
100˚C 150˚C
Main Switch MOS OFF
driver
2.5V to 12V s Internal Switching power device
TAB1
Error amp
+
2.45V
PWM comp
+
VOUT
Main
MOSFET for switch SBD for rectification s Fixed 250kHz PWM frequency Without external resistor and capacitor s Overcurrent protection
Q 3V 1V OSC f=250kHz CLM Vth= 0.1~0.2V R S
+
-
28
27
1
2
3
4.24
8-11
amp-
ampOUT
S/S
OCL-
OCL+
GND
P.GND
s Thermal shutdown function
PIN ASSIGNMENT
Pin# 1 2 3 4
VOUT:TAB1 TAB2:VDD
S/S: 1 OCL-: 2 OCL+: 3 GND: 4 Vcc...
