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S-8337ABDA-P8T1G Datasheet(PDF) 8 Page - Seiko Instruments Inc

Part # S-8337ABDA-P8T1G
Description  SWITCHING REGULATOR CONTROLLER
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Manufacturer  SII [Seiko Instruments Inc]
Direct Link  http://www.sii.co.jp
Logo SII - Seiko Instruments Inc

S-8337ABDA-P8T1G Datasheet(HTML) 8 Page - Seiko Instruments Inc

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STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series
Rev.4.0_01
8
2. S-8338 Series
Table 5 Electrical Characteristics
(Unless otherwise specified: VIN
= 3.3 V, Ta = 25°C)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Test
Circuit
Operating input voltage
VIN
1.8
6.0
V
2
FB voltage
VFB
0.985
1.000
1.015
V
2
Current consumption
ISS1
fosc
= 700 kHz
VFB
= 0.95 V
400
700
μA
1
Shutdown current
consumption
ISSS
VIN
= 6.0 V
1.0
μA
1
EXT pin output current
IEXTH
VEXT
= VIN − 0.4 V
−100
−60
mA
1
IEXTL
VEXT
= 0.4 V
100
160
mA
1
FB voltage temperature
coefficient
ΔVFB
ΔTa
Ta
= −40°C to +85°C
±100
ppm/
°C2
FB pin input current
IFB
−0.1
+0.1
μA
1
Oscillation frequency*1
fosc
fosc
= 1133 kHz (ROSC = 120 kΩ)
fosc
= 700 kHz (ROSC = 200 kΩ)
fosc
= 286 kHz (ROSC = 510 kΩ)
VFB
= 0.9 V
Waveform on EXT pin is measured
fosc
× 0.9
fosc
fosc
× 1.1
kHz
1
Oscillation frequency
temperature coefficient
Δfosc
ΔTa
Ta
= −40°C to +85°C
fosc
= 700 kHz
1000
ppm/
°C1
Max. duty ratio
MaxDuty fosc
= 700 kHz (ROSC = 200 kΩ)
83
88
93
%
1
Soft-start time
tSS
tSS
= 10 ms, 15 ms, 20 ms
Selectable in three steps
tSS
× 0.75
tSS
tSS
× 1. 5
ms
1
Short-circuit protection
delay time*2
tPRO
tPRO
= 50 ms
(CSP
= 0.1 μF)
37.5
50
75
ms
1
UVLO detection voltage
VUVLO
VUVLO
= 1.5 V to 2.3 V
Selected in 0.1 V steps
VUVLO
× 0.95
VUVLO
VUVLO
× 1.05
V
1
UVLO hysteresis width
VUVLOHYS
VUVLOHYS
= 0.1 V to 0.3 V
Selected in 0.1 V steps
VUVLOHYS
× 0.6
VUVLOHYS
VUVLOHYS
× 1.4
mV
1
CC pin output current
ICCH
VFB
= 2 V
−75
−50
−37.5
μA
1
ICCL
VFB
= 0 V
37.5
50
75
μA
1
Timer latch reset
voltage
VRTLT
0.7
1.0
1.3
V
1
Shutdown pin input
voltage (High level)
VSH
1.8
V
1
Shutdown pin input
voltage (Low level)
VSL
0.3
V
1
Shutdown pin input
current (High level)
ISH
−0.1
+0.1
μA
1
Shutdown pin input
current (Low level)
ISL
−0.1
+0.1
μA
1
*1. The recommended range of the resistance (Rosc) for setting the oscillation frequency is Rosc
= 120 kΩ to 510 kΩ (fosc = 286 kHz to 1.133
MHz). However, the oscillation frequency is in the range of typical values when an ideal resistor is externally connected, so actually
the fluctuation of the IC (
±10%) must be considered.
*2. The short-circuit protection time can be set by the external capacitor, and the maximum set value by the external capacitor is unlimited
when an ideal case is assumed. But, use CSP
= approximately 0.47 μF as a target maximum value due to the need to consider the
discharge time of the capacitor.


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