BD9639MWV_16 Datasheet, PDF (7/26 Pages) Rohm – Switching Regulator ICs

BD9639MWV
Application Information
1. Function Description
(1) Features Summary
CH
Function
CH1
CH2
CH3
CH4
CH5
CH6
Boost converter
Buck converter
H-BRIDGE converter
H-BRIDGE converter
Buck converter
Boost converter
Output voltage
3.70[V] to 5.50[V]
1.05[V] to 1.80[V]
1.80[V] to 3.30[V]
3.25[V]
1.50[V] to 1.80[V]
2 LED to 6 LED
Power output
Embedded
Embedded
Embedded
Embedded
Embedded
Embedded
Setting res.
External
External
External
Embedded
External
External
USE
Start-up CH, Motor
Core
CMOS
Digital
CMOS, Memory
LED
(2) CONTROL
(a) Stand-by function related terminals
Following table shows start-up condition of each block.
XSHDN1 XSHDN24 XSHDN3
XSHDN5
XSHDN6
CH1 PFM CH1 PWM
Internal
supply
L
-
-
-
L
L
L
H
H
L
H
H
L
L
(Note) - symbol mean without conditions.
OFF
-
OFF
OFF
ON
L
L
OFF
ON
ON
H
CH2
CH4
CH3
CH5
CH6
OFF
OFF
OFF
OFF
ON
ON
ON
OFF
OFF ON
(b) Other setting terminals
(c) XSHDN24 to XSHDN6 terminal equivalent circuit
VBAT
VBAT
30[kΩ ]
400[kΩ ]
AGND
XSHDN1 terminal does not have a pull down.
it is necessary to process the VBAT input and the GND input.
(3) Start-up Circuit
CH1 begins operating using PFM when XSHDN1 goes “HIGH”.
Afterwards, when XSHDN24 goes “HIGH” an internal power supply turns ON and CH1 starts operating using PWM.
From the time XSHDN24 goes “HIGH”, CH2 to CH6 enters standby mode for about 5 ms after which CH2 and CH4
begin a soft start. Similarly, when XSHDN24 to XSHDN6 goes High synchronously, CH2 to CH6 starts soft-start
after the normal wait time.
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TSZ22111・15・001
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TSZ02201-0313AA400630-1-2
09.Feb.2016 Rev.001