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MPDRX312S Short Form
2
■ OUTPUT VOLTAGE ADJUSTMENT
Internal Circuit
MPDRX312S
Vout
(a) 0.8V ≦ Vout ＜ 0.9V (F.T. : open)
5440
6.8 k ?
RVAR ＝
Voadj[V] ? 0.8[V]
? 1800 [O]
VAR pin
1.8 k ?
(b)0.9 ≦ Vout ≦ 1.8V
(FT-pin ： SHORT to GND)
RVAR
FT pin
Error amp
RVAR ＝
5440
Voadj[V] ? 0.9[V]
? 1800 [O]
<RVAR CALCULATION EXAMPLE>
Voadj [V] Calculated RVAR
[ Ω ]
RVAR Example
[ Ω ]
F.T. pin
1.8 4240 3.9k+330
1.5 7270 6.8k+470
1.2 16330 16k+330
1.0 52600 47k+5.6k
Short to GND
Short to GND
Short to GND
Short to GND
0.9
0.8
∞
∞
Open
Open
Short to GND
Open
■ TEST CIRCUIT
SENSE
2
12,13,14,15
Vin
Vout
3,4,5
C1
MPDRX312S
C2
RL
16,17,18
GND
GND
6,7,8,9
1 OVPOUT
RVAR
19 SS
20 N.C.
VAR
FT
11
10
21 PWRGD
22 ON/OFF
C1 ： 100 μ F ／ 10V Ceramic Capacitor
C2 ： 100 μ F ／ 6.3V Ceramic Capacitor
Please make sure to place C1 and C2 nearby input and output terminal of DC-DC converter.
Note:
1. This datasheet is downloaded from the website of Murata Manufacturing co., ltd. Therefore, it’ s specifications are subject to change or our
products in it may be discontinued without advance notice. Please check with our sales representatives or product engineers before ordering.
2. This datasheet has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product
specifications or transact the approval sheet for product specifications before ordering.
2009.9.3
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