S-8340A25AFT-T2-X Datasheet, PDF (11/55 Pages) Seiko Instruments Inc – SWITCHABLE SWITCHING REGULATOR CONTROLLER

STEP-UP, 600 kHz, PWM CONTROL OR PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.4.0_01
S-8340/8341 Series
(3) 300 kHz, Output Voltage Fixed Type (C Type)
Table 7
Parameter
Symbol
Conditions
Output voltage^*1
Input voltage
Oscillation start voltage
Current consumption 1
V_OUT(E)
V_IN
V_ST
I_SS1
Current consumption 2
Current consumption
at shutdown
EXT pin output current
I_SS2
I_SSS
I_EXTH
I_EXTL
Line regulation
ΔV_OUT1
V_IN = V_OUT(S) × 0.6,
I_OUT = V_OUT(S)/50 Ω
−
No external parts.
The voltage is applied to V_OUT.
V_OUT = V_OUT(S) × 0.95,
EXT pin open
S-834xC25 − 34
S-834xC35 − 44
S-834xC45 − 54
S-834xC55 − 60
V_OUT = V_OUT(S) + 0.5 V, EXT pin open
V_OUT = V_OUT(S) × 0.95, V_ON/OFF = 0 V
V_EXT = V_OUT(E) − 0.2 V
S-834xC25 − 34
S-834xC35 − 44
S-834xC45 − 54
S-834xC55 − 60
V_EXT = 0.2 V
S-834xC25 − 34
S-834xC35 − 44
S-834xC45 − 54
S-834xC55 − 60
V_IN = V_OUT(S) × 0.4 to V_OUT(S) × 0.6
I_OUT = V_OUT(S)/50 Ω
Load regulation
ΔV_OUT2
V_IN = V_OUT(S) × 0.6, 10 μA ≤ I_OUT ≤ V_OUT(S)/40 Ω
Output voltage
temperature coefficient^*2
Oscillation frequency
ΔV_OUT
ΔTa•V_OUT
f_OSC
V_IN = V_OUT(S) × 0.6, I_OUT = V_OUT(S)/50 Ω
Ta = −40 to +85°C
V_OUT = V_OUT(S) × 0.95
Measure waveform at the EXT pin
Maximum duty ratio
MaxDuty
V_IN = V_OUT(S) × 0.95
Measure waveform at the EXT pin
PWM/PFM switching
duty ratio
(S-8341 Series C type)
PFMDuty V_IN = V_OUT(E) − 0.1 V, under no load
Current limit detection
voltage
V_SENSE
V_OUT = V_OUT(S) × 0.95
Judge oscillation at the EXT pin or oscillation
stop at “L”
ON/OFF pin input voltage V_SH
V_SL
V_OUT = V_OUT(S) × 0.95
Judge oscillation at the EXT pin.
V_OUT = V_OUT(S) × 0.95
Judge oscillation stop at the EXT pin.
ON/OFF pin input
I_SH
V_OUT = 6 V, V_ON/OFF = 6 V
leakage current
I_SL
V_OUT = 6 V, V_ON/OFF = 0 V
Soft-start time
t_SS
V_IN = V_OUT(S) × 0.6, C_SS = 4700
pF, I_OUT = V_OUT(S)/50 Ω,
S-8340Cxx
Measure time until oscillation
occurs at EXT pin.
S-8341Cxx
Efficiency
EFFI
V_IN = V_OUT(S) × 0.6,
I_OUT = V_OUT(S)/50 Ω
S-834xC25 − 34
S-834xC35 − 44
S-834xC45 − 54
S-834xC55 − 60
(Ta = 25°C unless otherwise specified)
Min.
Typ.
Max.
Unit ^Measurement
Circuit
V_OUT(S)
× 0.98
V_OUT(S)
V_OUT(S)
× 1.02
V
1
−
−
6
V
1
−
−
0.9
V
2
−
210
430
μA
2
−
270
520
μA
2
−
350
650
μA
2
−
440
740
μA
2
−
110
185
μA
2
−
−
3.0
μA
2
−13
−24
−
mA
−
−17
−30
−
mA
−
−21
−34
−
mA
−
−23
−37
−
mA
−
32
56
−
mA
−
42
69
−
mA
−
50
78
−
mA
−
56
85
−
mA
−
−
V_OUT(S)
× 0.5%
V_OUT(S)
× 1%
V
1
−
V_OUT(S)
× 0.5%
V_OUT(S)
× 1%
V
1
−
±100
− ppm/°C
1
255
300
345
kHz
2
73
82
89
%
2
15
21
31
%
1
90
120
150
mV
2
0.8
−
−
V
2
−
−
0.3
V
2
−0.1
−
0.1
μA
2
−0.1
−
0.1
μA
2
6.0
14.3 28.0
ms
1
6.0
17.2 28.0
ms
1
−
83
−
%
1
−
85
−
%
1
−
87
−
%
1
−
87
−
%
1
11