s-8460 Seiko Instruments Inc., s-8460 Datasheet - Page 5

• Manufacturer Part Number: s-8460
• Description: Step-up Or Down, Single-coil, Pwm Control Switching Regulator Controller
• Manufacturer: Seiko Instruments Inc.

External parts
Output voltage at step-down
Output voltage at step-up
Input voltage
Current consumption 1
Current consumption 2
Current consumption at
shutdown
VL pin output voltage
EXT1, 2, 3 pin output current
Line regulation
Load regulation
Output voltage temperature
coefficient
Oscillation frequency
Maximum duty ratio
FB pin input current
ON/OFF pin input voltage
ON/OFF pin input leakage
current
Soft-start time
Integration time of protection
circuit
Efficiency at step-down
Efficiency at step-up
Rev.2.1
Electrical Characteristics
STEP-UP OR DOWN, SINGLE-COIL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Parameter
_00
Coil :
Diode :
Capacitor :
Transistor : Fairchild Semiconductor Corporation
C
C
C
R
R
C
C
VL
SS
PRO
BST
FB1
FB2
fzfb
:
:
:
:
:
:
:
V
V
V
I
I
I
V
I
I
ΔV
ΔV
f
MaxDuty
I
V
V
I
I
t
t
EFFI1
EFFI2
SS1
SS2
SSS
EXT1, 2, 3H
EXT1, 2, 3L
Δ
OSC
FB
SH
SL
SS
PRO
Symbol
OUTD
OUTU
IN
L
SH
SL
Ta V
Δ
OUT1
OUT2
V
Sumida Corporation
Rohm Corporation
Nichicon Corporation
4.7 μF (ceramic)
4700 pF
2200 pF
0.1 μF
230 kΩ
100 kΩ
330 pF
•
Matsushita Electric Industrial Co., Ltd.
OUT
OUT
V
V
No external parts, V
(step-up mode at MaxDuty)
No external parts, V
(step-down mode at 0% Duty)
V
The same condition as I
V
V
V
I
V
Ta = −40 to +85°C
The same condition as I
pin is measured.
The same condition as I
pin is measured.
The same condition as I
The same condition as I
output at VL pin.
The same condition as I
output at VL pin.
The same condition as I
The same condition as I
The same condition as I
start is measured.
The same condition as I
C
measured.
V
V
OUT
(Unless otherwise specified : V
IN
IN
ON/OFF
VL
EXT1, 2, 3
IN
IN
IN
IN
PRO
= 2.2 to 18.0 V
= 4.95 V
= 2.64 V
= 4.95 V
= 4.95 V, I
= 2.64 V, I
= 4.5 V, V
= 10 μA to 1.25 × 66 mA
: 2200 pF, repeat time of C
= 0 V
= 0.2 V
Seiko Instruments Inc.
EXT1, 2, 3
OUT
OUT
= 200 to 600 mA
= 50 to 400 mA
Conditions
OUT
OUT
= V
Table 3
= 3.3 V × 0.95 V
= 3.3 V + 0.5 V
−
SS2
SS1
SS1
SS1
SS2
SS2
SS1
SS1
SS1
SS1
VL
, waveform at EXT3
, waveform at EXT3
, judged by voltage
, judged by voltage
, V
, V
, time for EXT3 pin to
, CSS pin : OPEN,
− 0.2
ON/OFF
ON/OFF
IN
PRO
= 5.0 V, I
= V
= 0 V
pin is
CDRH104R (22 μH)
MA2Q737 (Schottky)
RB411D (Schottky)
F93 (16 V, 47 μF, tantalum) × 4
FDN337N × 3
IN
OUT
= 66 mA, output voltage is set to 3.3 V, Ta = 25°C)
3.234
3.234
Min.
4.32
−0.1
−0.1
1.25
255
2.2
1.6
6.0
30
40
70
−
−
−
−
−
−
−
−
−
−
× 1.0%
× 1.0%
V
V
±100
Typ.
4.50
12.0
900
300
3.3
3.3
0.5
0.0
2.5
75
40
60
OUTD
OUTD
78
87
83
−
−
−
−
−
× 2.0%
× 2.0%
3.366
3.366
V
V
Max.
1380
18.0
4.68
24.0
150
345
2.0
0.1
0.4
0.1
0.1
5.0
OUTD
OUTD
85
−
−
−
−
−
−
ppm/°C
Unit
kHz
mA
mA
μA
μA
μA
μA
μA
μA
ms
ms
%
%
%
V
V
V
V
V
V
V
V
S-8460
Measurement
Circuit
2
2
2
1
1
1
1
1
1
2
2
−
1
1
1
1
1
1
1
1
1
2
2
5