S-8821 Series
www.sii-ic.com
VOLTAGE REGULATION
STEP-UP CHARGE PUMP DC-DC CONVERTER
© Seiko Instruments Inc., 2002-2010 Rev.5.0_00
Seiko Instruments Inc. 1
The S-8821 series is a CMOS step-up charge pump DC-DC converter with a voltage regulation function.
The S-8821 series consists of an oscillation circuit, a controller, a reference voltage circuit, an error amplifier
circuit, and an output switching transistor, and can regulate the output voltage by PFM control.
Since small ceramic capacitors can be used for the pump capacitor, input capacitor, and output capacitor, the
mounting area can be minimized.
Features
Step-up PFM control CMOS charge pump
Power supply voltage:
1.6 to 5.0 V
Output voltage:
2.5 to 5.5 V, selectable in 0.1 V steps.
Output voltage accuracy: ±2 % max.
Built-in soft start circuit:
1.0 ms typ.
Output current 25 mA (V
IN
=(V
OUT(S)
× 0.80) V)
Oscillation frequency:
1.0 MHz typ.
ON/OFF function: During standby: 1 μA max.
Lead-free, Sn 100%, halogen-free
*1
*1. Refer to “ Product Name Structure” for details.
Applications
Lithium ion battery driven applications
Local power supply
Power supply for white LED display backlights
Packages
SOT-23-6W
SNT-8A
VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER
S-8821 Series
Rev.5.0_00
Seiko Instruments Inc. 2
Block Diagram
VIN
Switch
control
circuit
SW1
SW
2
SW
3
SW
4
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 1
VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER
Rev.5.0_00
S-8821 Series
Seiko Instruments Inc. 3
Product Name Structure
The output voltage and packages for the S-8821 Series can be selected at the users request. Refer to
the “Product name” for the meanings of the characters in the product name, “Package” regarding the
package drawings and “Product name list” for the full product names.
1. Product name
(1) SOT-23-6W
S-8821 xx A MH xxx TF x
Output voltage
25 to 55
(E.g., when the output voltage is 2.5 V, it is
expressed as 25.)
IC direction in ta
p
e s
p
ecifications
*1
Package name (abbreviation)
MH: SOT-23-6W
Environmental code
S: Lead-free, halogen-free
G: Lead-free (for details, please contact our sales office)
Product name (abbreviation)
*2
*1. Refer to the tape specifications at the end of this book.
*2. Refer to the product name list.
(2) SNT-8A
S-8821 xx A PH xxx TF U
Output voltage
25 to 55
(E.g., when the output voltage is 2.5 V, it is
expressed as 25.)
IC direction in tape specifications
*1
Package name (abbreviation)
PH: SNT-8A
Environmental code
U: Lead-free (Sn 100%), halogen-free
Product name (abbreviation)
*2
*1. Refer to the tape specifications at the end of this book.
*2. Refer to the product name list.
2. Package
Drawing Code
Package Name
Package Tape Reel Land
SOT-23-6W MP006-B-P-SD MP006-B-C-SD MP006-B-R-SD
SNT-8A PH008-A-P-SD PH008-A-C-SD PH008-A-R-SD PH008-A-L-SD

S-882145AMH-M2UTFG

Mfr. #:
Manufacturer:
ABLIC
Description:
Switching Voltage Regulators Step Up Charge Pump
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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