Document
S-8821 Series
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VOLTAGE REGULATION BOOST CHARGE PUMP DC-DC CONVERTER
Rev.5.2_00
The S-8821 series is a CMOS boost 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
• PFM control CMOS boost charge pump • Power supply voltage: • Output voltage: • Output voltage accuracy: • Built-in soft start circuit: • Output current • Oscillation frequency: • ON/OFF function: • Lead-free, Sn 100%, halogen-free*1
1.6 to 5.0 V 2.5 to 5.5 V, selectable in 0.1 V steps. ±2 % max. 1.0 ms typ. 25 mA (VIN=(VOUT(S) × 0.80) V) 1.0 MHz typ. During standby: 1 μA max.
*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
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VOLTAGE REGULATION BOOST CHARGE PUMP DC-DC CONVERTER S-8821 Series
Block Diagram
VIN CIN=4.7 μF
SW1
C+ CPUMP=0.10 μF
C−
SW2 SW3 SW4
Switch control circuit
Soft start circuit
PFM control oscillator circuit (1.0 MHz)
Rs
+
Rf
-
ON/OFF circuit
Reference voltage
Rev.5.2_00
VOUT COUT=10 μF
ON/OFF
Figure 1
GND
2
Rev.5.2_00
VOLTAGE REGULATION BOOST CHARGE PUMP DC-DC CONVERTER S-8821 Series
Product Name Structure
• The output voltage and packages for the S-8821 Series can be selected at the user’s 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
Environmental code S: Lead-free, halogen-free G: Lead-free (Contact our sales representatives for details) U: Lead-free (Sn 100%), halogen-free
IC direction in tape specifications*1
Product name (abbreviation)*2
Package name (abbreviation) MH: SOT-23-6W
Output voltage 25 to 55 (E.g., when the output voltage is 2.5 V, it is expressed as 25.)
*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
Environmental code U: Lead-free (Sn 100%), halogen-free
IC direction in tape specifications*1
Product name (abbreviation)*2
Package name (abbreviation) PH: SNT-8A
Output voltage 25 to 55 (E.g., when the output voltage is 2.5 V, it is expressed as 25.)
*1. Refer to the tape specifications at the end of this book. *2. Refer to the product name list.
2. Package
Package Name
SOT-23-6W SNT-8A
Package
MP006-B-P-SD PH008-A-P-SD
Drawing Code
Tape
Reel
MP006-B-C-SD MP006-B-R-SD
PH008-A-C-SD PH008-A-R-SD
Land ⎯
PH008-A-L-SD
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VOLTAGE REGULATION BOOST CHARGE PUMP DC-DC CONV.