BU90002GWZ_11 Datasheet, PDF (2/14 Pages) Rohm – Output 1.0A High-efficiency Step-down Switching regulators with Built-in Power MOSFET

BU90002GWZ, BU90003GWZ, BU90004GWZ, BU90005GWZ, BU90006GWZ
●Absolute maximum ratings
Parameter
Symbol
Rating
Maximum input power supply voltage
VIN
7
Maximum voltage at EN, FB, LX, MODE
VEN, VFB,
VLX, VMODE
7
Power dissipation
Pd
0.39(*1)
Operating temperature range
Topr
-40 ～ +85
Storage temperature range
Tstg
-55 ～ +125
Junction temperature
Tjmax
+125
(*1) When mounted on the specified PCB (55mm x 63mm), Deducted by 3.9m W/c when used over Ta=25c
Technical Note
Unit
V
V
W
℃
℃
℃
●Operating conditions Ta=25c, VIN=3.6V(BU90003GWZ～BU90006GWZ),VIN=5.0V(BU90002GWZ)
Item
【Switching regulator】
Symbol
Rating
Min.
Typ.
Max.
Unit
Condition
Output voltage accuracy
【Soft start】
-2
VOUTA
-2
IoutMax1
-
IoutMax2
-
IoutMax3
-
-
+2
MODE:H(PWM Operation)
-
+3
%
MODE:L(PWM/PFM Operation)
-
1.0
A
3.0V≦VIN＜5.5V
-
0.8
A
2.7V≦VIN＜3.0V
-
0.6
A
2.3V≦VIN＜2.7V
Soft start time
Tss
65
120
240 usec
【Frequency control】
No load
5.4
6.0
6.6
MHz BU90002GWZ,BU90005GWZ
BU90006GWZ
Switching frequency
fosc
4.8
5.4
6.0
MHz
No load
BU90004GWZ
【Driver】
3.6
4.0
4.4
MHz
No load
BU90003GWZ
PchFET on resistance
RonP1
-
250
400 mOhm VIN=5.0V
RonP2
300
450 mOhm VIN=3.6V
NchFET on resistance
【Control】
RonN1
-
RonN2
220
350 mOhm VIN=5.0V
250
380 mOhm VIN=3.6V
EN pin
Operation
VENH
1.4
-
VIN
V
control
voltage
Non Operation
VENL
0
-
0.4
V
MODE pin _Operation
VMODEH 1.4
-
VIN
V Forced PWM
control
voltage
Non Operation VMODEL
0
-
0.4
V Automatic PFM/PWM
【UVLO】
Protect threshold voltage
Uvth
1.95
2.05
2.15
V
Hysteresis
【Current limit】
Uvhy
50
100
150
mV
Current limit threshold
ILIMIT
1.5
1.7
1.9
A
PMOS current detect,
Open loop
【Output discharge】
Output discharge resistance
DRES
55
110
220 Ohm EN=0V
【Circuit current】
Operating quiescent current
EN:H, MODE:L,
IINS
-
45
65
uA VOUT=3.6V forced
Not switching
Shutdown current
SHD
-
0
1
uA EN=0V
○No design for durability against radiation
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Target spec. ver.1.7