58 ICs
1-1-3 DC/DC Converter ICs
■Recommended Operating Conditions*1
Parameter
Input Voltage Range
Output Voltage Range
Output Current Range
Operating Junction Temperature Range
Operating Temperature Range
Symbol
VIN
VCC
VC/E
VO
IO
Tjop
Top
Unit
V
V
V
V
A
°C
°C
■Absolute Maximum Ratings*1
Unit
V
V
V
W
°C
°C
°C/W
°C/W
Symbol
VIN
VCC
VC/E
PD
Tj
Tstg
θ
j-c
θ
j-a
Parameter
Input Voltage
Power Dissipation*2, *3
Junction Temperature
Storage Temperature
Thermal Resistance (junction to case)
*2
Thermal Resistance (junction to ambient air)
*2
Ratings
SPI-8001TW SPI-8002TW SPI-8003TW
21 40 40
21 40 40
21 40 40
3.0
+135 +150
–40 to +135 –40 to +150
9.0
35.8
■Features
•2 regulators combined in one package
•Output current: 1.5A × 2 (HSOP 16 Pin
Surface mount package)
•High efficiency: TYP80% (SPI-8001TW),
TYP78% (SPI-8002TW)
•Variable output voltage: 1.0 to 16V (SPI-
8001TW), 1.0 to 24V (SPI-8002TW)
•Built-in reference oscillator (250kHz): Enables
to downsize a choke-coil
•Low circuit current consumption: ≤ 1
µ
A (at
output OFF)
•High accuracy reference voltage: ±1%
•Built-in foldback-overcurrent and thermal
protection circuits
•Built-in ON/OFF circuit (soft start available) –
per output
*1: Absolute maximum ratings show the destructive limit. No parameter should exceed the ratings in transient or normal
operations.
*2: When mounted on glass-epoxy board 70cm2 (copper laminate area 30.8cm2).
*3: Limited by thermal protection.
Ratings
SPI-8001TW SPI-8002TW SPI-8003TW
min. max. min. max. min. max.
VO+3 20 VO+3 38 VO+3 38
4.5 20 4.5 38 4.5 38
20 38 38
116 1241 24
1.5 1.5 1.5
–30 +135 –30 +135 –30 +125
–30 +135 –30 +135 –30 +85
*1: Recommended operating conditions show the operating conditions required for the normal circuit function described in the electrical characteristics.
These conditions must be followed in actual use.
2-Output, Step-down Switching Mode
SPI-8001TW/SPI-8002TW/SPI-8003TW
■Applications
•Onboard local power supplies
•OA equipment
•For stabilization of the secondary-side output voltage of switching power supplies
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59
ICs
SPI-8001TW/SPI-8002TW/SPI-8003TW
■Electrical Characteristics*1
Unit
V
mV/°C
%
%
kHz
mV
mV
A
mA
mA
µ
A
µ
A
mA
mA
V
V
µ
A
V
µ
A
Parameter
Reference Voltage
Temperature Coefficient
of Reference Voltage
Efficiency 1*2
Efficiency 2*2
Oscillation Frequency
Line Regulation
Load Regulation
Overcurrent Protection
Starting Current
Quiescent Circuit Current 1
Quiescent Circuit Current 2
Quiescent Circuit Current 3
Quiescent Circuit Current 4
Quiescent Circuit Current 5
Quiescent Circuit Current 6
High Level Voltage
C/E Pin
Low Level Voltage
Inflow Current
at High
Low Level Voltage
SS Pin*3
Inflow Current
at Low
Symbol
VREF
Conditions
∆VREF/∆T
Conditions
Eff1
Conditions
Eff2
Conditions
fosc
Conditions
VLINE
Conditions
VLOAD
Conditions
IS
Conditions
IIN
Conditions
ICC
Conditions
IIN (off)
Conditions
ICC (off)
Conditions
IIN (ssov)
Conditions
ICC (ssov)
Conditions
VC/EH
Conditions
VC/EL
Conditions
IC/EH
Conditions
VSSL
Conditions
ISSL
Conditions
(Ta=25°C)
*1: Electrical characteristics show the characteristic ratings guaranteed when operating the ICs under the measurement conditions described in the above table.
*2: Efficiency is calculated from the following formula.
η
(%) = VO·IO× 100
VIN·IIN
*3: Pin 6 and pin 11 are the SS pins. Soft start at power on can be performed with capacitors connected to these pins. The outputs can also be turned ON/OFF with these pins. The
outputs are stopped by setting the voltages of these pins to VSSL or lower. SS-pin voltages can be changed with open-collector drive circuits of transistors.
When using both the soft-start and ON/OFF functions together, the discharge currents from C4 and C5 flow into the ON/OFF control transistors respectively. Therefore, limit the
currents securely to protect the transistors if C4 and C5 capacitances are large. The SS pins are pulled up to the power supply in the ICs, so applying the external voltages are
prohibited.
Ratings
SPI-8001TW SPI-8002TW SPI-8003TW
min. typ. max. min. typ. max. min. typ. max.
0.996 1.006 1.016 0.996 1.006 1.016 0.966 1.006 1.016
VIN=10V, VO=1V, IO=0.1A VIN=14V, IO=0.1A
±0.1 ±0.1 ±0.1
VIN=10V, VO=1V, IO=0.1A, Ta=–30 to +135°C
VIN=14V, IO=0.1A, Ta=–30 to +125°C
80 78 78
VIN=VCC=15V, VO=5V, IO=0.5A, IIN: including ICC
V
IN
= V
CC
=14V, V
O
=5V, I
O
=0.5A, I
IN
: including I
CC
83 81 81
VIN=15V, VO=5V, IO=0.5A, VCC=5V, IIN: excluding ICC
V
IN
=14V, V
CC
=5V, V
O
=5V, I
O
=0.5A, I
IN
: excluding I
CC
250 215 250 285 200 400
VIN=VCC=15V, VO=5V, IO=0.5A VIN=14V, IO=0.1A, COSC=100pF
30 60 30 60 30 60
VIN=VCC=10 to 20V, VO=5V, IO=1A VIN=VCC=9 to 18V, VO=5V, IO=1A
10 40 10 40 10 40
VIN=VCC=15V, VO=5V, IO=0.2 to 1.5A
V
IN
=V
CC
=14V, V
O
=5V, I
O
=0.2 to 1.5A
1.6 1.6 1.6
VIN=VCC=15V VIN=VCC=14V
444
VIN=15V, VCC=5V, IO=0V, VO≤12V VIN=14V, VCC=5V, IO=0A, VO≤12V
8.5 8.5 8.5
VCC=15V, IO=0A VCC=14V, IO=0A
111
VIN=15V, VC/E=0V or Open VIN=14V, VC/E=0V or Open
111
VCC=15V, VC/E=0V or Open VIN=14V, VC/E=0V or Open
—4
— VIN=14V, VCC=5V, IO=0A, SS1=SS2=0V
—8.5
—VCC=14V, IO=0V, SS1=SS2=0V
22 2
VIN=VCC=15V VIN=VCC=14V
0.8 0.8 0.8
VIN=VCC=15V VIN=VCC=14V
95 95 95
VC/E=20V VC/E=20V
0.5 0.5 0.5
VIN=VCC=15V VIN=VCC=14V
60 80 60 80 60 80
VSSL=0V, VIN=VCC=15V VSSL=0V, VIN=VCC=14V
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60 ICs
1-1-3 DC/DC Converter ICs
(Unit : mm)
■External Dimensions (HSOP16)
10.5±0.2
2.5±0.2
2.75MAX
7.5±0.2
0.4+0.15/–0.051.27±0.25
2.0+0.2/–0.08
A
10.5±0.3
0.9±0.3
0 to 0.1
0 to 8°
0.25+0.15/–0.05
(2)
(4.5)
1+0.1/–0.05
(Heatsink thickness)
1.35±–0.2
(Between the root of leads and
back side)
12.2±–0.2
(Gate remains: Not included in dimensions)
S 0.10 S
Enlarged View of A
16 9
18
(11)
916
Pin Assignment
(SPI-8001TW, SPI-8002TW)
qAGND oAGND
wVIN1 !0 VREF2
eVCC !1 SS2
rSWout1 !2 DGND2
tDGND1 !3 SWout2
ySS1 !4 C/E
uVREF1 !5 VIN2
iN.C !6 N.C
■Block Diagram
SPI-8001TW/SPI-8002TW
RESET
3V
1V
3V
AGND
SS16
Amp
Buffer-Amp
V
REF1
7
R5
C4
V
REF
V
C/E
V
CC
3
14 C/E
V
IN1
2
TSDfdown
+
SW
OUT1
DGND1
DGND2
V
IN2
4
5
15
13
L1
Di1
L2
C2
R1
R2
R3
R4
V
O1
V
O2
AGND
f down
cut
+
–+
–
PWM
AGND
1, 9
+
–
–
C7
+
C1 C6
V
IN
Di2
3V
SS211
Amp
Buffer-Amp
V
REF2
10
R6
C5
+
12
SW
OUT2
C3
+
–+
–
PWM
+
–
C8
OSC
RESET
PRegStart
f down
cut
Drive
PWM
Logic
OCP
OCP
Drive
PWM
Logic
UVLO
–
Pin Assignment
(SPI-8003TW)
qAGND oAGND
wVIN1 !0 ROSC
eVCC !1 VREF2
rSWout1 !2 SS2
tDGND1 !3 DGND2
ySS1 !4 SWout2
uVREF1 !5 C/E
iCOSC !6 VIN2
SPI-8003TW
3V
1V
3V
AGND
SS16
Amp
Buffer-Amp
V
REF1
7
R5
R7 C9
C5
C6
V
REF
V
C/E
V
CC
3
15 C/E
V
IN1
2
TSDfdown
+
SW
OUT1
DGND1
DGND2
V
IN2
4
5
16
14
L1
Di1
L2
C2
R1
R2
R3
R4
V
O1
V
O2
AGND
f down
cut
+
–+
–
PWM
AGND
1, 9
+
–
–
C7
+
C1 C4
V
IN
Di2
3V
SS212
Amp
Buffer-Amp
V
REF2
11
10
8
R6
+
13
SW
OUT2
C3
+
–+
–
PWM
+
–
C8
OSC
RESET
PRegStart
f down
cut
Drive
PWM
Logic
OCP
OCP
Drive
PWM
Logic
UVLO
–
Cosc
Rosc
Product Mass : Approx.0.86g
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61
ICs
SPI-8001TW/SPI-8002TW/SPI-8003TW
■Typical Connection Diagram
V
IN
GND
V
C/E
V
CC
3
V
IN1
SWout1
R5
C4
C1C6
+
24
SS1
6
11
DGND1
5
V
IN2
15
SS2
DGND2
12
7
V
REF1
13
SWout2
10
V
REF2
R6
C5
C/E
AGND
Ch2
Ch1
14
1, 9
Di2
L2
I
REF2
C3
V
02
C8
+
GND
Di1
L1
I
REF1
C2
R1
R2
R3
R4
V
01
C7
+
SPI-8000TW
Diodes Di1, Di2
• Be sure to use Schottky-barrier diodes for Di1 and Di2.
If other diodes like fast recovery diodes are used, IC may be destroyed because of the reverse voltage generated by the recovery voltage or ON voltage.
Choke coils L1, L2
•If the winding resistance of the choke coil is too high, the efficiency may drop below the rated value.
•As the overcurrent protection starting current is about 2.0A, take care concerning heat radiation from the choke coil caused by magnetic saturation due to
overload or short-circuited load.
•Use a closed-magnetic-path coil to prevent interference between the channels SWout1 and SWout2.
Capacitors C1, C2, C3
•As large ripple currents flow through C1, C2 and C3, use high-frequency and low-impedance capacitors suitable for switching mode power supplies.
Especially when the impedance of C2 and C3 are high, the switching waveforms may become abnormal at low temperatures. For C2 and C3, do not use
capacitors with extremely low equivalent series resistance (ESR) such as OS capacitors or tantalum capacitors, which may cause abnormal oscillation.
Resistors R1, R2, R3, R4
•R1, R2, R3 and R4 are resistors for setting output voltages. Set the resistors so that IREF is approx. 1 mA. For example, R1 and R2 can be calculated as
shown below.
(V
O1
–V
REF1
)(V
O1
–V) V
REF1
1
R1= I
REF1
=1
×
10
–3
(
Ω
), R2= I
REF1
= 1
×
10
–3
1(K
Ω
)
To create the optimum operating conditions, place the components as close as possible to each other.
C1 : 220
µ
F/50V
C2, C3 : 470
µ
F/25V
C4, C5 : 1
µ
F
C6, C7, C8 : 0.1
µ
F
Note 1: The efficiency depends on the input voltage and the output current. Therefore, obtain the value from the efficiency graph and substitute the percent-
age in the formula above.
Note 2: Thermal design for D1 must be considered separately.
■Ta-PD Characteristics
VO:Output Voltage
VIN :Input Voltage
IO:Output Current
ηχ
:Efficiency (%)
VF:D1 Forward Voltage
SJPB-H6···0.45V (IO=1A)
PD = VO·IO 100 –1 – VF·IO 1– VO
ηχ
VIN
–25
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0255075100
125 135150
Power Dissipation PD (W)
Ambient Temperature Ta (°C)
69.2°C/W (0.84 cm2)
52.3°C/W (3.34 cm2)
42.6°C/W (8.64 cm2)
35.8°C/W (30.8 cm2)
(Copper Laminate Area)
θ
j-a
38.2°C/W (15.6 cm2)
=
..
V
IN
GND
V
C/F
V
CC
3
V
IN1
SWout1
R5
C5
C1C4
C9 R7
+
24
SS1
6
12
DGND1
5
V
IN2
16
SS2
DGND2
13
7
V
REF1
14
SWout2
11
V
REF2
R6
C6
C/E
AGND C
ORC
R
CSC
Ch2
Ch1
15
1, 9 10
Di2
L2
I
REF2
C3
V
C2
C8
+
GND
Di1
L1
I
REF1
C2
R1
R2
R3
R4
V
C1
C7
+
8
SPI-8003TW
R5, R6 : 1kΩ
L1, L2 : 47
µ
H
Di1, Di2 : SJPB-H6
(Sanken)
C1 : 220
µ
F/50V
C2, C3 : 470
µ
F/25V
C4 : 1
µ
F/50V
C5, C6 : 1
µ
F/10V
C7, C8 : 0.1
µ
F/50V
C9 : 100pF/10V
L1, L2 : 47
µ
H
R2, R4 : 1kΩ
R5, R6 : 1kΩ
Di1, Di2 : SJPB-H6 (Sanken)
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