S-8340A25AFT-T2-X Datasheet, PDF (13/55 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
(4) 300 kHz, Output Voltage External Setting Type (D Type)
Table 8
Parameter
Symbol
Conditions
Output voltage^*1
FB pin voltage
Input voltage
Oscillation start voltage
Current consumption 1
Current consumption 2
Current consumption
at shutdown
V_OUT(E)
V_FB
V_IN
V_ST2
I_SS1
I_SS2
I_SSS
V_IN = 2.4 V, I_OUT = 80 mA
V_IN = 2.4 V, I_OUT = 80 mA
−
No external parts.
The voltage is applied to V_DD.
V_OUT = 3.8 V
V_OUT = 4.5 V
V_OUT = 3.8 V, V_ON/OFF = 0 V
EXT pin output current
Line regulation
Load regulation
Output voltage
temperature coefficient^*2
Oscillation frequency
Maximum duty ratio
PWM/PFM switching
I_EXTH
I_EXTL
ΔV_OUT1
ΔV_OUT2
ΔV_OUT
ΔTa•V_OUT
f_OSC
MaxDuty
V_EXT = V_OUT(E) − 0.2 V
V_EXT = 0.2 V
1.6 V ≤ V_IN ≤ 2.4 V, I_OUT = 80 mA
V_IN = 2.4 V, 10 μA ≤ I_OUT ≤ 100 mA
V_IN = 2.4 V, I_OUT = 80 mA, Ta = −40 to +85°C
V_OUT = 3.8 V, Measure waveform at the EXT pin
V_IN = 3.8 V, Measure waveform at the EXT pin
duty ratio
(S-8341 Series D type)
PFMDuty V_IN = V_OUT(E) − 0.1 V, Under no load
Current limit detection
voltage
V_SENSE
V_OUT = 3.8 V
Judge oscillation at the EXT pin or oscillation
stop at “L”
FB pin input current
I_FB
ON/OFF pin input voltage V_SH
V_OUT = 6 V, V_FB = 1.5 V
V_OUT = 3.8 V
Judge oscillation at the EXT pin.
V_SL
V_OUT = 3.8 V
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 = 2.4 V,
C_SS = 4700 pF,
S-8340D00
I_OUT = 80 mA,
Measure time until oscillation
occurs at the EXT pin.
S-8341D00
Efficiency
EFFI
V_IN = 2.4 V, I_OUT = 80 mA
(Ta = 25°C unless otherwise specified)
Min.
Typ.
Max.
Unit ^Measurement
Circuit
3.920 4.000 4.080
V
3
0.980 1.000 1.020
V
3
−
−
6
V
3
−
−
0.9
V
4
−
255
460
μA
4
−
110
185
μA
4
−
−
3.0
μA
4
−19
−30
−
mA
−
46
69
−
mA
−
−
20
40
mV
3
−
20
40
mV
3
−
±100
− ppm/°C
3
255
300
345
kHz
4
73
82
89
%
4
15
21
31
%
3
90
120
150
mV
4
−50
−
50
nA
4
0.8
−
−
V
4
−
−
0.3
V
4
−0.1
−
0.1
μA
4
−0.1
−
0.1
μA
4
6.0
14.3 28.0
ms
3
6.0
17.2 28.0
ms
3
−
85
−
%
3
13