S-8337AAAA-P8T1G Datasheet, PDF (8/51 Pages) Seiko Instruments Inc – SWITCHING REGULATOR CONTROLLER

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8337/8338 Series
Rev.4.0_01
2. S-8338 Series
Parameter
Operating input voltage
FB voltage
Current consumption
Shutdown current
consumption
EXT pin output current
FB voltage temperature
coefficient
FB pin input current
Oscillation frequency^*1
Oscillation frequency
temperature coefficient
Max. duty ratio
Soft-start time
Short-circuit protection
delay time^*2
UVLO detection voltage
UVLO hysteresis width
CC pin output current
Timer latch reset
voltage
Shutdown pin input
voltage (High level)
Shutdown pin input
voltage (Low level)
Shutdown pin input
current (High level)
Shutdown pin input
current (Low level)
Symbol
VIN
VFB
ISS1
ISSS
IEXTH
IEXTL
ΔVFB
ΔTa
IFB
fosc
Δfosc
ΔTa
MaxDuty
tSS
tPRO
VUVLO
VUVLOHYS
ICCH
ICCL
VRTLT
VSH
VSL
ISH
ISL
Table 5 Electrical Characteristics
(Unless otherwise specified: VIN = 3.3 V, Ta = 25°C)
Conditions
Min.
Typ.
Max.
Unit
Test
Circuit
⎯
1.8
⎯
6.0
V
2
⎯
0.985 1.000 1.015
V
2
fosc = 700 kHz
VFB = 0.95 V
⎯
400
700
μA
1
VIN = 6.0 V
⎯
⎯
1.0
μA
1
VEXT = VIN − 0.4 V
VEXT = 0.4 V
⎯
−100
−60
mA
1
100
160
⎯
mA
1
Ta = −40°C to +85°C
⎯
±100
⎯ ppm/°C 2
⎯
−0.1
⎯
+0.1
μA
1
fosc = 1133 kHz (ROSC = 120 kΩ)
fosc = 700 kHz (ROSC = 200 kΩ)
fosc = 286 kHz (ROSC = 510 kΩ)
VFB = 0.9 V
fosc
× 0.9
fosc
fosc
× 1.1
kHz
1
Waveform on EXT pin is measured
Ta = −40°C to +85°C
fosc = 700 kHz
⎯
1000
⎯ ppm/°C 1
fosc = 700 kHz (ROSC = 200 kΩ)
83
88
93
%
1
tSS = 10 ms, 15 ms, 20 ms
Selectable in three steps
tSS
× 0.75
tSS
tSS
× 1. 5
ms
1
tPRO = 50 ms
(CSP = 0.1 μF)
37.5
50
75
ms
1
VUVLO = 1.5 V to 2.3 V
Selected in 0.1 V steps
VUVLO
× 0.95
VUVLO
VUVLO
× 1.05
V
1
VUVLOHYS = 0.1 V to 0.3 V
Selected in 0.1 V steps
VUVLOHYS
× 0.6
VUVLOHYS
VUVLOHYS
× 1.4
mV
1
VFB = 2 V
−75
−50 −37.5
μA
1
VFB = 0 V
37.5
50
75
μA
1
⎯
0.7
1.0
1.3
V
1
⎯
1.8
⎯
⎯
V
1
⎯
⎯
⎯
0.3
V
1
⎯
−0.1
⎯
+0.1
μA
1
⎯
−0.1
⎯
+0.1
μA
1
*1. The recommended range of the resistance (R_osc) for setting the oscillation frequency is R_osc = 120 kΩ to 510 kΩ (f_osc = 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 C_SP = 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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