S-8365AAABA-M5T1Y2 Datasheet, PDF (11/63 Pages) Seiko Instruments Inc – PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER

STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Rev.2.1_01
S-8365/8366 Series
2. 600 kHz product
Table 9 Electrical Characteristics
(VDD = 3.3 V, Ta = 25°C unless otherwise specified)
Item
Symbol
Conditions
Min. Typ. Max.
Unit
Test
Circuit
Input voltage^*1
VDD
−
1.8
−
5.5
V
2
Operating start
voltage^*2
VST1
Product without UVLO function,
IOUT = 1 mA
−
−
1.0
V
3
Oscillation start
voltage
VST2
No external parts
for product without UVLO function,
−
−
0.9
V
1
Operation holding
voltage
Product without UVLO function,
VHLD
IOUT = 1 mA, Determined by decreasing 0.8
−
VDD gradually
−
V
3
FB voltage
VFB
⎯
0.588 0.6 0.612 V
1
FB voltage temperature ΔVFB
coefficient
ΔTa
Ta = −40°C to +85°C
− ±100 − ppm/°C 1
FB pin input current
IFB
VDD = 1.8 V to 5.5 V, FB pin
−0.1
−
0.1
μA
1
Current consumption
at operation^*3
ISS1
At switching operation, no load
VFB = VFB(S) × 0.95
−
300
−
μA
1
Current consumption
at switching off
ISS2
At switching stop, VFB = VFB(S) × 1.5
−
70 120 μA
1
Current consumption
at shutdown
ISSS
VON / OFF = 0 V
−
−
1.0
μA
1
EXT pin output current
IEXTH
IEXTL
VEXT = VDD − 0.4 V
VEXT = 0.4 V
− −130 −60 mA
1
100 200
−
mA
1
Oscillation frequency fosc
−
510 600 690 kHz
1
Maximum duty ratio
Max
Duty
VFB = VFB(S) × 0.95
85
90
95
%
1
PWM / PFM switching PFM
Duty ratio^*4
Duty
VDD = VOUT(S) − 0.1 V, no load
20
28
36
%
2
Short-circuit
delay time^*5
protection
tPRO
Product with short-circuit protection,
At CSP = 0.1 μF
37.5 50
75
ms
1
UVLO release voltage VUVLO+ Product with UVLO function
1.60 1.70 1.78
V
1
UVLO hysteresis width VUVLOHYS Product with UVLO function
0.05 0.10 0.15
V
1
High level input voltage VSH
VDD = 1.8 V to 5.5 V, ON/OFF pin
0.75
−
−
V
1
Low level input voltage VSL
VDD = 1.8 V to 5.5 V, ON/OFF pin
−
−
0.3
V
1
High level input current ISH
Product without ON/OFF pin pull-down,
VDD = 1.8 V to 5.5 V, ON/OFF pin
−0.1
−
0.1
μA
Product with ON/OFF pin pull-down,
VDD = 1.8 V to 5.5 V, ON/OFF pin
0.2 1.0
2.5
μA
1
1
Low level input current ISL
VDD = 1.8 V to 5.5 V, ON/OFF pin
−0.1
−
0.1
μA
1
Soft-start time
tSS
−
5
7
10
ms
2
*1. The S-8365/8366 Series steps up from VDD = 1.0 V, but set the input voltage as to 1.8 V ≤ VDD ≤ 5.5 V for stabilizing
the output voltage and oscillation frequency.
*2. This is the guaranteed value measured with external parts shown in “Table 10 External Parts List” and with test
circuits shown in Figure 10. The operating start voltage varies largely depending on diode’s forward voltage.
Evaluate sufficiently with actual device.
*3. VFB(S) is a setting value for FB voltage.
*4. VOUT(S) is a setting value for output voltage. VOUT is the typical value of actual output voltage.
VOUT(S) can be set by using the rate of VFB and the output voltage setting resistors (RFB1, RFB2).
For details, refer to “ External Parts Selection”.
*5. 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.
For details, refer to “ External Parts Selection”.
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