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S-882140AMH-M2PTFG

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER
Rev.5.0_00
S-8821 Series
Seiko Instruments Inc. 7
Electrical Characteristics
Table 5
(V
IN
=(V
OUT(S)
× 0.60) V
*1
, Ta=25°C unless otherwise specified)
Items Symbols Conditions Min. Typ. Max. Units
Test
circuits
V
OUT(S)
≤ 2.9 V 1.6 ⎯ 5.0 V 2
Operation input voltage V
IN
V
OUT(S)
> 2.9 V
V
OUT(S)
×
0.54
⎯ 5.0 V 2
Output voltage
*2
V
OUT(E)
I
OUT
=10 mA
V
OUT(S)
×
0.98
V
OUT(S)
V
OUT(S)
×
1.02
V 2
V
IN
=(V
OUT(S)
× 0.54) V
*6
5 ⎯ ⎯ mA 2
V
IN
=(V
OUT(S)
× 0.60) V
*1
15 ⎯ ⎯ mA 2
Output current
*3
I
OUT
V
IN
=(V
OUT(S)
× 0.80) V 25 ⎯ ⎯ mA 2
Line regulation
ΔV
OUT1
V
IN
=(V
OUT(S)
× 0.60) V
*1
to (V
OUT(S)
− 0.10) V,
I
OUT
=10 mA
⎯ 50 100 mV 2
Load regulation
ΔV
OUT2
I
OUT
=0.1 mA to 10 mA ⎯ 40 80 mV 2
Ripple voltage
*4
V
RIP
I
OUT
=10 mA
⎯ 70 ⎯ mV
p
−
p
2
Maximum oscillation
frequency
f
osc
V
OUT
=(V
OUT(S)
× 0.60) V,
Measure waveform at C− pin
800 1000 1200 kHz 2
Efficiency
*5
η
V
IN
=(V
OUT(S)
× 0.54) V,
V
OUT(S)
≥ 3.0 V, I
OUT
=5 mA
⎯ 90 ⎯ % 1
Operation consumption
current
I
SS1
V
IN
=V
OUT(S)
,
V
OUT
=(V
OUT(S)
+ 0.5) V
⎯ 35 60 μA 2
Standby consumption
current
I
SSS
V
IN
=(V
OUT(S)
× 0.54) V
*6
to 5.0 V,
V
ON/OFF
=0 V
⎯ 0.3 1.0 μA 1
ON/OFF pin input
voltage (high level)
V
SH
V
IN
=(V
OUT(S)
× 0.54) V
*6
to 5.0 V
1.5 ⎯ ⎯ V 1
ON/OFF pin input
voltage (low level)
V
SL
V
IN
=(V
OUT(S)
× 0.54) V
*6
to 5.0 V
⎯ ⎯ 0.3 V 1
ON/OFF pin input
current (high level)
I
SH
V
IN
=(V
OUT(S)
× 0.54) V
*6
to 5.0 V
−0.1 ⎯ 0.1 μA 1
ON/OFF pin input
current (low level)
I
SL
V
IN
=(V
OUT(S)
× 0.54) V
*6
to 5.0 V
−0.1 ⎯ 0.1 μA 1
Soft start time t
SS
I
OUT
=10 mA 0.2 1.0 4.0 ms 1
*1. In case of V
OUT
≤ 3.3 V, V
IN
=2.0 V
*2. V
OUT(E)
: Actual output voltage
V
OUT(S)
: Specified output voltage
*3. The output current at which the output voltage becomes 97 % of V
OUT(E)
after gradually increasing the
output current.
*4. Design assurance
*5. The ideal efficiency is indicated by the following expression.
Efficiency (η)=(V
OUT
× I
OUT
) / (2.0 × V
IN
× I
OUT
)
*6. In case of V
OUT
≤ 2.9 V, V
IN
=1.6 V
VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER
S-8821 Series
Rev.5.0_00
Seiko Instruments Inc. 8
Test Circuits
1.
VOUT
GND
ON/OFF
C
−
C
+
VIN
A
A
AA A
4.7
μ
F
Figure 5
2.
VOUT
GND
ON/OFF
C
−
C
+
VIN
AA
4.7
μ
F
0.1
μ
F
10
μ
F
Figure 6
VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER
Rev.5.0_00
S-8821 Series
Seiko Instruments Inc. 9
Operation
1. Basic operation
Figure 7 shows the block diagram of the S-8821 Series.
The S-8821 series controls the output voltage by using the pulse frequency modulation (PFM) method.
The SW1 to SW4 switching transistors are switched ON/OFF with the clock generated by the internal
oscillator circuit, and operates the step-up charge pump.
The output voltage is fed back and the voltage split by feedback resistances R
s
and R
f
and reference
voltage (V
ref
) are compared by a comparator. This comparator signal is used to modulate the oscillation
pulse frequency in order to keep the output voltage constant.
VIN
Switch
control
circuit
SW1
SW
SW
SW
C
+
C
−
C
PUMP
=0.10
μ
F
Soft start
circuit
ON/OFF
circuit
ON/OFF
PFM control
oscillator
circuit
(
1.0 MHz
)
Reference
voltage
+
-
VOUT
GND
C
OUT
=10
μ
F
R
s
R
f
C
IN
=4.7
μ
F
Figure 7
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

S-882140AMH-M2PTFG

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Manufacturer:
ABLIC
Description:
Switching Voltage Regulators STEP UP CHARGE PUMP
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