S-8337AAAA-P8T1G Datasheet, PDF (7/51 Pages) Seiko Instruments Inc – SWITCHING REGULATOR CONTROLLER

STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.0_01
S-8337/8338 Series
 Electrical Characteristics
1. S-8337 Series
Parameter
Symbol
Operating input voltage
FB voltage
Current consumption
EXT pin output current
FB voltage temperature
coefficient
FB pin input current
VIN
VFB
ISS1
IEXTH
IEXTL
ΔVFB
ΔTa
IFB
Oscillation frequency^*1
fosc
Oscillation frequency
temperature coefficient
Δfosc
ΔTa
Max. duty^*2
MaxDuty
Soft-start time
Short-circuit protection
delay time^*3
UVLO detection voltage
tSS
tPRO
VUVLO
UVLO hysteresis width VUVLOHYS
CC pin output current
Timer latch reset voltage
ICCH
ICCL
VRTLT
Table 4 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
VEXT = VIN − 0.4 V
⎯
400
700
μA
1
⎯
−100
−60
mA
1
VEXT = 0.4 V
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)
MaxDuty = 88.5% (RDuty = 100 kΩ)
MaxDuty = 77% (RDuty = 300 kΩ)
MaxDuty
−5
MaxDuty
MaxDuty
+5
%
1
MaxDuty = 47% (RDuty = 820 kΩ)
tSS = 10 ms, 15 ms, 20 ms
Selected 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. 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 recommended range of the resistance (R_Duty/R_osc) for setting the maximum duty is R_Duty/R_osc = 0.5 to 4.1 (MaxDuty = 47 to 88.5%).
However, the maximum duty is in the range of typical values when an ideal resistor is externally connected, so actually the fluctuation
of the IC (±5%) must be considered.
*3. 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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