bd8962muv ROHM Co. Ltd., bd8962muv Datasheet - Page 4

• Manufacturer Part Number: bd8962muv
• 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 with synchronous rectifier.
Advantage 3：・Supplied in smaller package due to small-sized power MOS FET incorporated.
Utilizes the synchronous rectifying mode and the low on-resistance
MOS FETs incorporated as power transistor.
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.)
VREF
R1 R2
ADJ
+
Start
Soft
Reduces a mounting area required.
SLOPE
R
VCC
ITH
ITH
UVLO
SCP
TSD
OSC
Current
Comp
+
C
V
ITH
CC
CLK
R
S
Q
Current
Sense/
Protect
Driver
Logic
Voltage drop due to sudden change in load was reduced by about 50%.
+
PVCC
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
BD8962MUV (Load response I
15mm
R
C
ITH
ITH
R
R
2
1
Rf
C
100
90
80
70
60
50
40
30
20
10
f
0
10
20mm
【 VOUT=1.2 】
C
BST
C
OUTPUT CURRENT:I
IN
O
Fig.19 Efficiency
=1A→3A)
Co
100
L
62mV
VCC=5V
Ta=25℃
1000
OUT
[mA]
10000