S-882125AMH-M2ATFG

Manufacturer Part NumberS-882125AMH-M2ATFG
DescriptionVOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER
ManufacturerSII [Seiko Instruments Inc]
S-882125AMH-M2ATFG datasheet
 


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Rev.3.1
_00
VOLTAGE REGULATION
STEP-UP CHARGE PUMP DC-DC CONVERTER
Features
• Step-up PFM control CMOS charge pump
• Power supply voltage:
• Output voltage:
• Output voltage accuracy:
• Built-in soft start circuit:
• Output current
• Oscillation frequency:
• ON/OFF function:
• Ultra-small package:
• Lead-free products
Applications
• Lithium ion battery driven applications
• Local power supply
• Power supply for white LED display backlights
Packages
Package Name
SOT-23-6W
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,
capacitor, the mounting area can be minimized.
1.6 to 5.0 V
2.5 to 5.5 V, selectable in 0.1 V steps.
±2 % max.
1.0 ms typ.
× 0.80) V)
25 mA (V
=(V
IN
OUT(S)
1.0 MHz typ.
During standby: 1 μA max.
SOT-23-6W
Drawing Code
Package
Tape
MP006-B
MP006-B
Seiko Instruments Inc.
S-8821 Series
input
capacitor,
and
output
Reel
MP006-B
1

S-882125AMH-M2ATFG Summary of contents

  • Page 1

    ... Power supply for white LED display backlights Packages Package Name SOT-23-6W 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 ...

  • Page 2

    ... VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER S-8821 Series Block Diagram VIN =4.7 μ SW1 SW2 C + =0.10 μ PUMP C − SW3 SW4 2 PFM control Switch oscillator control circuit circuit (1.0 MHz) Soft start circuit ON/OFF circuit ON/OFF Figure 1 Seiko Instruments Inc. Rev.3.1 _00 VOUT =10 μ ...

  • Page 3

    ... Product name S-8821 *1. Refer to the taping specifications at the end of this book. *2. Refer to the product name list. 2. Product name list Table 1 Output Voltage 2.5 V S-882125AMH-M2ATFG 3.0 V S-882130AMH-M2FTFG 3.3 V S-882133AMH-M2ITFG 3.5 V S-882135AMH-M2KTFG 3.6 V S-882136AMH-M2LTFG 4.0 V S-882140AMH-M2PTFG 4.5 V S-882145AMH-M2UTFG 5 ...

  • Page 4

    ... C+ (positive pin) Charge-pump pump capacitor connection pin 3 C− (negative pin) Shutdown pin 4 ON/OFF High level (H) : normal operation (step-up) Low level (L) : step-up halt (all circuit halt) 5 GND GND pin 6 VOUT Voltage output pin Seiko Instruments Inc. Rev.3.1 Table 2 Pin Description ...

  • Page 5

    ... Board size: (2) Board name: JEDEC STANDARD51-7 Caution The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions. (1) When mounted on board 800 ...

  • Page 6

    ... In case of V =2.0 V OUT IN * Actual output voltage OUT( Specified output voltage OUT(S) *3. The output current at which the output voltage becomes output current. *4. Design assurance *5. The ideal efficiency is indicated by the following expression. × I Efficiency (η)=(V OUT OUT ≤ 2 *6. In case ...

  • Page 7

    ... VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER Rev.3.1 _00 Test Circuits 1. 4.7 μ 0.1 μF 4.7 μF A VIN VOUT C+ GND C− ON/OFF A Figure 4 VIN VOUT C+ GND C− ON/OFF 10 μF A Figure 5 Seiko Instruments Inc. S-8821 Series A 7 ...

  • Page 8

    ... Figure 6 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. ...

  • Page 9

    ... SW4 to ON (charge cycle). Following charging the electricity, in order to discharge the charged electricity to the output capacitance (C and SW4 to OFF (discharge cycle). The input voltage can be stepped constant voltage value by repeating this charge cycle and discharge cycle. Figure 7 shows the charge cycle, and Figure 8 shows the discharge cycle. ...

  • Page 10

    ... S-8821 Series 3. Shutdown Pin (ON/OFF Pin) Setting the ON/OFF pin to the Low level ("L") causes the voltage of the VOUT pin to change to the GND level and simultaneously the operation of all the internal circuit to stop. At this time, the consumption current is largely reduced level of approximately 0.3 μA. ...

  • Page 11

    ... Select a ceramic IN capacitor with a small equivalent series resistance (ESR). Although this figure varies according to the impedance of the power supply that is used as well as the load current value generally in the range of 4.7 μ μF. For the output capacitor (C voltage. A value of 10 μ ...

  • Page 12

    ... Moreover, in selecting C PUMP • The ON/OFF pin is configured as shown in Figure 9 and is neither pulled up or down internally not use this pin in a floating state. When not using the ON/OFF pin, connect it to the VIN pin. Moreover, please do not apply voltage higher than VIN + 0 ON/OFF pin. Current flows for a VIN pin through the protection diode inside IC. • ...

  • Page 13

    ... VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER Rev.3.1 _00 Characteristics (Typical Data) (1) Output voltage vs. Operation input voltage S-882133A I OUT 3.50 3.45 3.40 3.35 3.30 3.25 3.20 3.15 3.10 1.5 2.0 2.5 3.0 3.5 4.0 V [V] IN (2) Output voltage vs. Output current S-882133A V 3.50 3.45 3.40 3.35 3.30 3.25 3.20 3.15 3. [mA] OUT (3) Operation consumption vs. Operation input voltage S-882133A 1.5 2.0 2.5 3.0 3.5 4.0 V [V] IN S-882150A =10 mA, Ta=25° ...

  • Page 14

    ... V [ (5) Efficiency vs. Operation input voltage S-882133A I OUT 100 1.5 2.0 2.5 3.0 3.5 V [V] IN *1. The ideal efficiency is indicated by the following expression. × I Efficiency (η)=(V OUT (6) Maximum oscillation frequency vs. Operation input voltage S-882133A 1300 1200 1100 1000 900 800 700 1.5 2.0 2.5 3.0 3 S-882150A =10 mA, Ta=25° ...

  • Page 15

    ... VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER Rev.3.1 _00 (7) Load fluctuation S-882133A CH1 10 mA CH2 ms/div.] CH1: V CH2: I (8) Input voltage fluctuation S-882133A CH1 3.3 V CH2 1 ms/div.] CH1: V CH2: V S-882150A V =2 CH1 CH2 [20 mV/div.] OUT [2 mA/div.] OUT S-882150A I =10 mA OUT CH1 CH2 [20 mV/div ...

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    ... Use of the information described herein for other purposes and/or reproduction or copying without the express permission of Seiko Instruments Inc. is strictly prohibited. The products described herein cannot be used as part of any device or equipment affecting the human body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus installed in airplanes and other vehicles, without prior written permission of Seiko Instruments Inc ...