1-1-2 Switching Mode Regulator ICs
SAI Series
Surface-Mount, Separate Excitation Step-down Switching Mode Regulator ICs
sFeatures
• Surface-mount power package
• Output current: 0.4 to 0.5A
• High efficiency: 75 to 89%
• Requires only 4 discrete components
• Internally-adjusted phase correction and
output voltage
• Built-in reference oscillator (60kHz)
• Built-in overcurrent and thermal protection
circuits
sLine
up
Part Number
V
O
(V)
I
O
(A)
SAI01
5.0
0.5
SAI02
3.3
SAI03
12.0
0.4
SAI06
9.0
sAbsolute
Maximum Ratings
Parameter
DC Input Voltage
Power Dissipation
Junction Temperature
Storage Temperature
Thermal Resistance(junction to case)
Symbol
V
IN
P
D
T
j
T
stg
Ratings
35
0.75
+125
–40 to +125
20
Unit
V
W
°C
°C
°C/W
θ
j-c
sApplications
• Power supplies for telecommunication
equipment
• Onboard local power supplies
sRecommended
Operating Conditions
Ratings
Parameter
DC Input Voltage Range
Output Current Range
Operating Junction Temperature Range
Symbol
V
IN
I
O
T
jop
SAI01
7 to 33
0 to 0.5
–30 to +125
SAI02
5.3 to 28
SAI03
15 to 33
0 to 0.4
SAI06
12 to 33
Unit
V
A
°C
sElectrical
Characteristics
Ratings
Parameter
Symbol
min.
Output Voltage
Efficiency
Oscillation Frequency
Line Regulation
Load Regulation
Temperature Coefficient of Output Voltage
Ripple Rejection
Overcurrent Protection
Starting Current
V
O
Conditions
4.80
SAI01
typ.
5.00
V
IN
=20V, I
O
=0.3A
80
V
IN
=20V, I
O
=0.3A
60
V
IN
=20V, I
O
=0.3A
80
V
IN
=10 to 30V, I
O
=0.3A
30
V
IN
=20V, I
O
=0.1 to 0.4A
±0.5
45
f=100 to 120H
Z
0.55
V
IN
=10V
0.55
V
IN
=8V
40
100
max.
5.20
min.
3.17
SAI02
typ.
3.30
V
IN
=15V, I
O
=0.3A
75
V
IN
=15V, I
O
=0.3A
60
V
IN
=15V, I
O
=0.3A
60
V
IN
=8 to 28V, I
O
=0.3A
20
V
IN
=15V, I
O
=0.1 to 0.4A
±0.5
45
f=100 to 120H
Z
0.45
V
IN
=18V
30
80
max.
3.43
min.
11.40
SAI03
typ.
12.00
V
IN
=24V, I
O
=0.3A
88
V
IN
=24V, I
O
=0.3A
60
V
IN
=24V, I
O
=0.3A
100
V
IN
=18 to 30V, I
O
=0.3A
70
V
IN
=24V, I
O
=0.1 to 0.4A
±1.5
45
f=100 to 120H
Z
0.45
V
IN
=15V
95
130
max.
12.60
min.
8.55
SAI06
typ.
9.00
V
IN
=21V, I
O
=0.3A
86
V
IN
=21V, I
O
=0.3A
60
V
IN
=21V, I
O
=0.3A
90
V
IN
=15 to 30V, I
O
=0.3A
50
V
IN
=21V, I
O
=0.1 to 0.4A
±1.0
45
f=100 to 120H
Z
80
110
max.
9.45
(T
a
=25°C)
Unit
V
%
kH
Z
mV
mV
mV/°C
dB
A
η
Conditions
f
Conditions
∆V
OLINE
Conditions
∆V
OLOAD
Conditions
∆V
O
/∆T
a
R
REJ
Conditions
I
S1
Conditions
46
ICs
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