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PDF BD9123MUV Data sheet ( Hoja de datos )

Número de pieza BD9123MUV
Descripción 1.2A 1ch Synchronous Buck Converter
Fabricantes ROHM Semiconductor 
Logotipo ROHM Semiconductor Logotipo



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No Preview Available ! BD9123MUV Hoja de datos, Descripción, Manual

Datasheet
2.7V to 5.5V, 1.2A 1ch
Synchronous Buck Converter with
Integrated FET
BD9123MUV
General Description
BD9123MUV is ROHM’s high efficiency step-down
switching regulator designed to produce voltage as low
as 0.85V to 1.2V from a supply voltage of 5V/3.3V. It
offers high efficiency by using pulse skip control
technology and synchronous switches, and provides
fast transient response to sudden load changes by
implementing current mode control.
Features
Fast Transient Response with Current Mode PWM
Control System.
High Efficiency for All Load Range with
Synchronous Rectifier (Nch/Pch FET) and SLLMTM
(Simple Light Load Mode)
Output Voltage Selector (3 bit)
PGOOD Function
Soft-Start Function
Thermal Shutdown and UVLO Functions.
Short-Circuit Protection Circuit with Time Delay
Function.
Shutdown Function
Applications
Power Supply for LSI including DSP, Microcomputer and
ASIC
Key Specifications
Input Voltage Range:
Output Voltage Range:
Output Current:
Switching Frequency:
Pch FET ON-Resistance:
Nch FET ON-Resistance:
Standby Current:
Operating Temperature Range:
2.7V to 5.5V
0.85V to 1.2V
1.2A (Max)
1MHz(Typ)
0.35(Typ)
0.25(Typ)
0μA (Typ)
-40°C to +95°C
Package
W(Typ) x D(Typ) x H(Max)
VQFN016V3030
3.00mm x 3.00mm x 1.00mm
Typical Application Circuit
VIN CIN
VOUT
VID<2:0>
RITH
CITH
EN
VOUT
VCC,PVCC
PGOOD
VID<2:0)
ITH
GND,PGND
SW
VCC
RPG
L
CO
VOUT
Figure 1. Typical Application Circuit
Product structureSilicon monolithic integrated circuit
www.rohm.com
©2012 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
This product has no designed protection against radioactive rays
1/24
TSZ02201-0J3J0AJ00120-1-2
02.Oct.2014 Rev.002

1 page




BD9123MUV pdf
BD9123MUV
Typical Performance Curves
[VOUT=1.0V]
IO=1.2A
Ta=25°C
Input Voltage: VCC[V]
Figure 4. Output Voltage vs Input Voltage
[VOUT=1.0V]
Datasheet
VCC=5V
IO=0A
Ta=25°C
EN Voltage:VEN[V]
Figure 5. Output Voltage vs EN Voltage
[ VOUT = 1.0V]
[ VOUT = 1.0V]
VCC=5V
Ta=25°C
EN Voltage:VVEENN[[VV]]
Figure 6. Output Voltage vs EN Volatge
VCC=5V
IO=0A
Input Voltage: VCC[V]
Figure 7. Output Voltage vs Input Voltage
www.rohm.com
©2012 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
5/24
TSZ02201-0J3J0AJ00120-1-2
02.Oct.2014 Rev.002

5 Page





BD9123MUV arduino
BD9123MUV
Datasheet
2. Description of Functions
(1) Soft-Start Function
When EN terminal is shifted to “High” activates a soft-starter to gradually establish the output voltage with the current
being limited during startup. It prevents an overshoot of output voltage and an inrush current.
The slope of input signal is different and the soft start time is different depending on the value offset output voltage.
When set to 1V ,tSS=1msec(Typ)
VCC,EN
VOUT
1.2V
0.85V
tSS
tSS
[ms]
Figure 25. Soft-Start Action
(2) Shutdown Function
When EN terminal is shifted to “Low”, the device turns to Standby Mode, and all the functional blocks including
reference voltage circuit, internal oscillator and drivers are turned to OFF. Circuit current during standby is 0µA(Typ).
(3) UVLO Function
It detects whether the input voltage supplied is sufficient to secure the output voltage of this IC. A hysteresis of 50mV
(Typ) is designed to prevent output chattering.
Hysteresis 50mV
Vcc
EN
VOUT
Standby Mode
tss
Soft start
Operating Mode
tss tss
Standby
Mode
Standby
Operating Mode Mode
Operating Mode
Standby Mode
UVLO
UVLO
EN UVLO
Figure 26. Soft-Start, Shutdown, UVLO Timing Chart
(4) PGOOD Function
When the output voltage falls below 75% (Typ) of a set value, the output of an Open-Drain PGOOD pin is turned OFF. A
hysteresis width of 15% (Typ) is designed to prevent output chattering.
VOUT
90%
75%
PGOOD
The hysteresis width
tGP
Figure 27. PGOOD Timing Chart
www.rohm.com
©2012 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
11/24
TSZ02201-0J3J0AJ00120-1-2
02.Oct.2014 Rev.002

11 Page







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