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S-8365 Datasheet(PDF) 10 Page - Seiko Instruments Inc

Part No. S-8365
Description  STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
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Maker  SII [Seiko Instruments Inc]
Homepage  http://www.sii.co.jp
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S-8365 Datasheet(HTML) 10 Page - Seiko Instruments Inc

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STEP-UP, SUPER-SMALL PACKAGE, 1.2 MHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8365/8366 Series
Rev.1.1_00
Seiko Instruments Inc.
10
Electrical Characteristics
1. 1.2 MHz product
Table 8 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
1.1
V
3
Oscillation start
voltage
VST2
No external parts
for product without UVLO function,
1.0
V
1
Operation holding
voltage
VHLD
Product without UVLO function,
IOUT = 1 mA, Determined by decreasing
VDD gradually
0.8
V
3
FB voltage
VFB
0.588
0.6
0.612
V
1
FB voltage temperature
coefficient
∆VFB
∆Ta
Ta =
−40°C to +85°C
±100
ppm/
°C1
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
500
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
OFF
/
ON
V
= 0 V
1.0
µA
1
IEXTH
VEXT = VDD
− 0.4 V
−130
−60
mA
1
EXT pin output current
IEXTL
VEXT = 0.4 V
100
200
mA
1
Oscillation frequency
fosc
1.0
1.2
1.4
MHz
1
Maximum duty ratio
Max
Duty
VFB = VFB(S)
× 0.95
80
85
90
%
1
PWM / PFM switching
Duty ratio
*4
PFM
Duty
VDD = VOUT(S)
− 0.1 V, no load
20
28
36
%
2
Short-circuit protection
delay time
*5
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,
OFF
ON/
pin
0.75
V
1
Low level input voltage VSL
VDD = 1.8 V to 5.5 V,
OFF
ON/
pin
0.3
V
1
Product without
OFF
ON/
pin pull-down,
VDD = 1.8 V to 5.5 V,
OFF
ON/
pin
−0.1
0.1
µA
1
High level input current ISH
Product with
OFF
ON/
pin pull-down,
VDD = 1.8 V to 5.5 V,
OFF
ON/
pin
0.2
1.0
2.5
µA
1
Low level input current
ISL
VDD = 1.8 V to 5.5 V,
OFF
ON/
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 = 1.1 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).
*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.


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