BU9829GUL-W_10 Datasheet, PDF (13/17 Pages) Rohm – WL-CSP EEPROM family SPI BUS

BU9829GUL-W
Technical Note
●LDO regulator part
LDO regulator part of BU9829GUL-W is CMOSLDO of low power consumption. The data are stored into EEPROM and
output voltage change among 2.7~3.0V. 1step is 0.1V. LDO regulator part had LDOEN pin and VOUT pin. To make this
LDOEN pin LOW is standby mode of low power consumption.
○LDOEN Input Terminals
Input equivalent circuit of LDOEN is showed Fig.54. Input terminal is connected between input circuits made from NMOS
and pull up and input protection circuit. This pin is not pull up or pull down, therefore please don’t input Hi-z. If LDOEN is
LOW, all circuit don’t move and LDO part is standby mode of low power consumption.
LDOEN
VREF
-
+
VOUT
Fig.54 VOUT output terminals
Fig.55 VOUT output terminals
○VOUT Output Terminals
Output equivalent circuit of VOUT is showed Fig.55. If LDOEN is HIGH, LDO regulator output regulate voltage from
VOUT pin. If LDOEN is LOW, VOUT pin is GND by VOUT-GND resistance. Output overshoots change by output capacity,
in actual use, please evaluate and decide output capacity.
VOUT
172mV
13.6us
Oscilloscope Tektronix TDS3034B
Power source SHOWA 317B
rising 1us
IOUT=0→4mA
V CC=3. 0V
VCC
VOUT
LDO _E N
0.1uF
current
probe
700Ω
Input pulse
Rohm
K2095N
measurement circuit
VOUT
88mV
20us
Oscilloscope Tektronix TDS3034B
Power source SHOWA 317B
rising 1us
IOUT=0→4mA
V CC=3. 0V
VCC
VOUT
LDO _E N
0.1uF
current
probe
700Ω
Input pulse
Rohm
K2095N
measurement circuit
BU9829GUL-W Evaluation result
(I_OUT=0mA→4mA,C_OUT=1.0uF)
Fig.56 CL=0µF Transitional response
VOUT
40mV
12us
Oscilloscope Tektronix TDS3034B
Power source SHOWA 317B
rising1us
IOUT=0→4mA
V CC=3. 0V
VCC
VOUT
LDO _E N
0.1uF
current
probe
700Ω
Input pulse
Rohm
K2095N
measurement circuit
BU9829GUL-W Evaluation result
(I_OUT=0mA→4mA,C_OUT=0.1uF)
Fig.57 CL=0.1µF Transitional response
VOUT
40mV
120us
Oscilloscope Tektronix TDS3034B
Power source SHOWA 317B
rising 1us
IOUT=0→4mA
V CC=3. 0V
VCC
VOUT
LDO _E N
0.1uF
current
probe
700Ω
Input pulse
Rohm
K2095N
measurement circuit
BU9829GUL-W Evaluation result
(I_OUT=0mA→4mA,C_OUT=1.0uF)
Fig.58 CL=1.0µF Transitional response
BU9829GUL-W Evaluation result
(I_OUT=0mA→4mA,C_OUT=1.0uF)
Fig.59 CL=10µF Transitional response
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13/16
2010.09 - Rev.A