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PDF BH6952GU Data sheet ( Hoja de datos )

Número de pieza BH6952GU
Descripción Power Management IC
Fabricantes ROHM Semiconductor 
Logotipo ROHM Semiconductor Logotipo



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TECHNICAL NOTE
Power Management IC Series for Mobile Phones
High-efficiency
Power Management IC
BH6053GU, BH6951GU, BH6952GU
zDescription
The High-Efficiency Power Management IC is considered to be the best power supply for CPU application. It integrates a
step-down DC/DC converter and a multi channel LDO for portable devices. Each LDO can be controlled externally.
zFeatures
1) Fixed operation frequency (f=1.1MHz)
2) Low-current consumption at low load by using a LDO configured with a DC/DC converter
3) Includes soft start
4) Compact package
5) Includes over current limiter
6) Includes TSD (Thermal Shut Down)
7) Includes UVLO (Under Voltage Look Out)
zApplications
The device is suitable for use with all portable equipment, such as cellular phones, digital cameras, portable music players,
portable video games and PDAs.
z Product Lineup
Parameter
LDO ch number
DC/DC converter ch number
Package
BH6053GU
5ch
1ch
VCSP85H3 (32pin)
3.54mm×3.54mm
BH6951GU
-
1ch
VCSP85H2 (16pin)
2.60mm×2.60mm
BH6952GU
2ch
1ch
VCSP85H3 (24pin)
3.06 mm×3.06mm
Ver.B Nov.2005

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BH6952GU pdf
[REG4]
Unless otherwise specified, Ta=25 oC, VCC=VBAT =3.6V
Parameter
Symbol Min. Typ.
Max.
Unit
Condition
[REG4]
Circuit current
Iq - 35 54
µA Io=0mA
Output voltage
Vo 1.755 1.800 1.845
V Io=50mA
Output current
Io 50
-
- mA
Load stability
dVo1
-
8
60
mV Io=1~50mA
Input stability
dVo2
-
1
30
mV VBAT=3.0~4.5V, Io=50mA
Output voltage temperature
coefficient
dVo3 - +100
- ppm/ oC Ta=-30~75 oC, Io=50mA
Ripple rejection ratio
RR52
50
60
-
dB Io=50mA, *1
Current overload limiter
Iolim
-
90
-
mA Fold back, Vo=0V
Output noise voltage
VNO
-
110 190 µVrms BW=20~80kHz, Io=50mA
*1 Input signal level : -14dBV, Input frequency : 1KHz, Measurement frequency band width : 20Hz to 80kHz
[REG5]
Unless otherwise specified, Ta=25 oC, VCC=VBAT =3.6V
Parameter
Symbol Min. Typ.
Max.
Unit
Condition
[REG5]
Circuit current
Iq - 20 38 µA Io=0mA
1.5V output voltage
Vo1 1.460 1.500 1.540
V Io=30mA,SWVSEL=0V
1.2V output voltage
Vo2 1.160 1.200 1.240
V Io=30mA,SWVSEL=3.6V
Output current
Io 50
-
- mA
Load stability
dVo1
-
8
60
mV Io=1~30mA
Input stability
dVo2
-
1
30
mV VBAT=3.0~4.5V, Io=30mA
Output voltage temperature
coefficient
dVo3 - +100
- ppm/ oC Ta=-30~75 oC, Io=30mA
Ripple rejection ratio
RR62
50
60
-
dB Io=30mA
Current overload limiter
Iolim
-
90
-
mA Fold back, Vo=0V
Output noise voltage
VNO
-
110 160 µVrms BW=20~80kHz, Io=30mA
*1 Input signal level : -14dBV, Input frequency : 1KHz, Measurement frequency band width : 20Hz to 80kHz
[Interface, UVLO]
Unless otherwise specified, Ta=25 oC, VCC=VBAT= 3.6V
Parameter
Symbol Min. Typ.
[CPU Interface 1 (CNT1,2,3,4,5,SWEN,MODE)]
H Level Input current
IIH1 -10
L Level Input current
IIL1 -10
[CPU Interface 2 (SWVSEL,REG1VSEL)]
H Level Input current
IIH2 -10
L Level Input current
IIL2 -10
[CPU Interface 3 (CNT1,2,3,4,5,SWEN,MODE)]
H Level Input voltage
VIH 1.4
L Level Input voltage
VIL -
[CPU Interface 4 (SWVSEL,REG1VSEL)]
H Level Input voltage
VIH VCC×0.8
L Level Input voltage
VIL -
[UVLO (Under Voltage Lock Out)]
Detecting voltage 1
VDETHL 2.4
Detection release hysteresis
VHYS 25
1.95
0
0
0
-
0
-
-
2.5
50
5/16
Max.
10
10
10
10
-
0.25
VCC
VCC×0.2
2.6
100
Unit Condition
µA VIH=3.6V
µA VIL=0V
µA VIH=3.6V
µA VIL=0V
V
V
V
V
V VBAT=3.60V SWEEP
mV

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BH6952GU arduino
z Timing chart
The DC/DC converter is operated by the control of SWEN, MODE Pins.
SWEN
MODE
REG_L function
DC/DC function
OFF
-120mV offset
ON
658µsec (Min.)
At OFF wait time *2
ON
ON
488µsec (Typ.)
488µsec (Typ.)
OFF
OFF
REG_L->DC/DC switching time *1
DC/DC->REG_L switching time *1
Time is calculated by the standard operation frequency.
*1 REG_LDC/DC mode switching time and DC/DCREG_L mode switching time are defined by 512 counts of the
switching frequency. The resulting time is 488µsec when switching frequency is 1.05MHz.
*2. When the DC/DC converter is turned off (SWEN=MODE=HSWEN=L),
1. switch MODE to LOW to change REGL,
2. switch SWEN to L after 658usec.
Note: BH6952GU can turn off the DC/DC converter directly from DC/DC MODE without changing to REG_L.
zSelection of application parts
Decoupling capacitor
LDO block
Output terminal Recommended value
BH6053GU
REG1 ~ 3V
REG4V, 5V
2.2µF
1.0µF
BH6952GU
REG1V, 2V
2.2µF
Put these elements near each output part for stable operation.
Type
Ceramic capacitor
Ceramic capacitor
Ceramic capacitor
Reference voltage block
To stabilize the reference voltage, mount the ceramic capacitor of 0.1µF between VREF12, VREF24, and GND pin.
Put 0.1µF at the SOFT pin.
The SOFT Pin is a time setup pin of the Soft start, of the DC/DC converter.
Input voltage block
Connect a capacitor to the power supply pin for stable input voltage supply.
Connect a capacitor near each input pin for a stable operation.
[External component of DC/DC converter]
Inductor
Capacitor
Output terminal Recommended Recommended
value
value
Type
BH6053GU
BH6951GU
SWOUT
4.7µH
10µF
ceramic capacitor
BH6952GU
Put these elements near each output part for stable operation.
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