S-882136AMH-M2LTFG Seiko Instruments, S-882136AMH-M2LTFG Datasheet - Page 9
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S-882136AMH-M2LTFG
Manufacturer Part Number
S-882136AMH-M2LTFG
Description
IC CHARGE PUMP CONV 3.6V SOT23-6
Manufacturer
Seiko Instruments
Type
Step-Up (Boost), Switched Capacitor (Charge Pump)r
Datasheet
1.S-882130AMH-M2FTFG.pdf
(24 pages)
Specifications of S-882136AMH-M2LTFG
Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
3.6V
Current - Output
25mA
Frequency - Switching
1MHz
Voltage - Input
1.6 ~ 5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
SOT-23-6
Power - Output
300mW
Function
Step Up
Output Voltage
3.6 V
Output Current
25 mA
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Rev.5.0
Operation
1. Basic operation
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
voltage (V
pulse frequency in order to keep the output voltage constant.
Figure 7 shows the block diagram of the S-8821 Series.
C
PUMP
_00
C
IN
=0.10 μF
=4.7 μF
ref
VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER
) are compared by a comparator. This comparator signal is used to modulate the oscillation
VIN
C+
C−
SW2
SW1
SW3
SW4
Switch
control
circuit
Seiko Instruments Inc.
Soft start
circuit
ON/OFF
Figure 7
PFM control
(1.0 MHz)
oscillator
circuit
ON/OFF
circuit
Reference
voltage
+
-
R
R
s
s
f
and R
GND
S-8821 Series
f
and reference
VOUT
C
OUT
=10 μF
9