bd9132muv ROHM Co. Ltd., bd9132muv Datasheet - Page 4

• Manufacturer Part Number: bd9132muv
• Description: Step-down Switching Regulator
• Manufacturer: ROHM Co. Ltd.

●Information on advantages
Advantage 1：Offers fast transient response with current mode control system.
Advantage 2： Offers high efficiency for all load range.
Advantage 3：・Supplied in smaller package due to small-sized power MOS FET incorporated.
・For lighter load:
・For heavier load:
Utilizes the current mode control mode called SLLM for lighter load, which reduces various dissipation such as switching
dissipation (P
(P
Utilizes the synchronous rectifying mode and the low on-resistance MOS FETs incorporated as power transistor.
Offers high efficiency for all load range with the improvements mentioned above.
RON
V
Conventional product (Load response I
I
OUT
OUT
EN
Gm Amp
ON resistance of Highside MOS FET : 82mΩ(Typ.)
ON resistance of Lowside MOS FET : 70mΩ(Typ.)
) that may otherwise cause degradation in efficiency for lighter load.
VREF
R1 R2
ADJ
+
Start
Soft
Reduces a mounting area required.
SLOPE
R
VCC
ITH
ITH
UVLO
SCP
TSD
SW
OSC
Current
Comp
+
C
V
ITH
), gate charge/discharge dissipation, ESR dissipation of output capacitor (P
CC
CLK
R
S
Q
Current
Sense/
Protect
Driver
Logic
Voltage drop due to sudden change in load was reduced by about 50%.
+
PVCC
Achieves efficiency improvement for lighter load.
Achieves efficiency improvement for heavier load.
GND
PVCC
SW
PGND
VCC
BST
Fig.18 Comparison of transient response
145mV
・Output capacitor Co required for current mode control: 22μF ceramic capacitor
・Inductance L required for the operating frequency of 1 MHz: 2.2μH inductor
・Incorporates FET + Boot strap diode
3.3V
Input
O
Output
=1A→3A)
Fig.20 Example application
4/15
V
I
OUT
OUT
BD9132MUV (Load response I
15mm
R
C
ITH
ITH
R
R
2
1
Rf
C
f
100
50
20mm
0
0.001
ESR
C
BST
) and on-resistance dissipation
①
①inprovement by SLLM system
②improvement by synchronous rectifier
C
SLLM
Fig.19 Efficiency
IN
O
Output current Io[A]
=1A→3A)
PWM
0.01
Co
L
62mV
0.1
②
1