BU34DV7NUX Datasheet, PDF (3/27 Pages) Rohm – 1.8V to 5.5V, 300mA 1ch Synchronous Boost DC/DC Converter

BU34DV7NUX
Datasheet
●Block diagram
VIN
MODE
EN
UVLO
RSTBC
DELAY
VIN
RSTBO
SOFT
START
CONTROL
LOGIC
VIN
+
-
SWN3
LEVEL
SHIFT
DRIVER
TSD
OSC
+
-
SWN2
SWP1
SWP2
SW
SWN1
VOUT
SW
●MODE
INPUT PIN
MODE EN
PIN
PIN
0V
0V
0V
VIN
VIN
0V
VIN
VIN
COMP
AGND
Figure 3. Circuit Block
UVLO
ON
ON
OFF
ON
UVLO
RELEASE
VOLTAGE
2.0V(typ)
2.0V(typ)
-
2.0V(typ)
FUNCTION
DC/DC-control
PWM
or
PFM/PWM
-
PWM
-
PFM/PWM
RSTBO
0V
While Soft Start : 0V
After Soft Start : VIN
0V
While Soft Start : 0V
After Soft Start : VIN
SWP2
ON
OFF
OFF
OFF
PGND
SW-ON/OFF
SWN2 SWN3
SWP1
OFF
OFF
ON
OFF
OFF
ON
OFF
ON
OFF
Switching
OFF
Switching
SWN1
OFF
Switching
OFF
Switching
●Pin Configuration
Symbol Pin No.
Function
VIN
1
Power supply input
SW
2
Inductor connection terminal
COMP
3
Phase Compensation Pin
MODE
4
Function Select Pin
Soft Start Output Pin
RSTBO
5
While Soft Start : LOW(GND)
After Soft Start : High(VIN)
EN
6
EN=VIN: Power-ON
EN=GND: Power-OFF
RSTBC
7
Low Battery Detect Delay Pin
AGND
8
GND
PGND
9
GND
VOUT
10
Boost voltage output Pin
※ Don’t use EN PIN and MODE PIN at open.
●Input-Output Equivalent Circuit
I/O equivalent circuit diagram is as follows.
Terminal
circuit
C
C
A
C
A
C
A
B
B
C
VSON010X3030
3.0±0.1
1PIN MARK
S
0.08 S
C0.25
2.0±0.1
0.5
1
5
10
0.5
6 _+0.05
0.25 -0.04
Figure 4. Package
(Unit : mm)
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
3/24
TSZ02201-0Q1Q0AH00100-1-2
02.Aug.2012 Rev.001