1-1-3 DC/DC Converter ICs
SAI Series Surface-Mount, Separate Excitation Step-down Switching Mode
■Features
■Line up
• Surface-mount power package
• Output current: 0.4 to 0.5A
• High efficiency: 75 to 88%
• Requires only 4 discrete components
Part Number
SAI01
5.0
SAI02
3.3
SAI03
12.0
0.4
VO(V)
IO(A)
0.5
■Absolute Maximum Ratings
• Internally-adjusted phase correction and
output voltage
Parameter
Symbol
Ratings
Unit
V
DC Input Voltage
VIN
35
0.75
• Built-in reference oscillator (60kHz)
Power Dissipation
PD
W
• Built-in overcurrent and thermal protection
circuits
Junction Temperature
Storage Temperature
Tj
+125
°C
°C
Tstg
θj-c
–40 to +125
20
Thermal Resistance(junction to case)
°C/W
■Applications
• Power supplies for telecommunication
equipment
• Onboard local power supplies
■Recommended Operating Conditions
Ratings
SAI02
Parameter
Symbol
Unit
SAI01
SAI03
15 to 33
0 to 0.4
DC Input Voltage Range
VIN
IO
7 to 33
5.3 to 28
V
A
Output Current Range
0 to 0.5
Operating Junction Temperature Range
Tjop
–30 to +125
°C
■Electrical Characteristics
(Ta=25°C)
Ratings
Parameter
Symbol
SAI01
typ.
SAI02
typ.
SAI03
typ.
Unit
min.
max.
min.
3.17
max.
3.43
min.
11.40
max.
12.60
VO
4.80
5.00
5.20
3.30
12.00
Output Voltage
V
Conditions
η
V
V
V
IN=20V, I
O
O
O
=0.3A
V
V
V
IN=15V, I
O=0.3A
O=0.3A
O=0.3A
V
IN=24V, I
O
O
O
=0.3A
80
IN=20V, I
60
75
88
IN=24V, I
60
Efficiency
%
Conditions
f
=0.3A
=0.3A
IN=15V, I
60
V
V
=0.3A
=0.3A
Oscillation Frequency
Line Regulation
kHZ
mV
Conditions
∆VOLINE
Conditions
∆VOLOAD
Conditions
∆VO/∆Ta
RREJ
IN=20V, I
80
IN=15V, I
60
IN=24V, I
100
40
80
30
100
130
95
V
IN=10 to 30V, I
O
=0.3A
V
IN=8 to 28V, I
20
O
=0.3A
V
IN=18 to 30V, I
O=0.3A
30
70
Load Regulation
mV
V
IN=20V, IO=0.1 to 0.4A
V
IN=15V, IO=0.1 to 0.4A
VIN=24V, IO=0.1 to 0.4A
Temperature Coefficient of Output Voltage
±0.5
45
±0.5
45
±1.5
45
mV/°C
Ripple Rejection
dB
A
Conditions
IS1
f=100 to 120H
Z
f=100 to 120H
Z
f=100 to 120HZ
Overcurrent Protection
Starting Current
0.55
0.55
0.45
Conditions
V
IN=10V
VIN=8V
VIN=18V
ICs
12
ETC [ ETC ]
