S-882150ABD-M2ZTFG - Seiko Instruments

Rev.3.1_00

VOLTAGE REGULATION

STEP-UP CHARGE PUMP DC-DC CONVERTER S-8821 Series

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 mini mized.

 Features

• Step-up PFM control CM OS charge pump

• Power supply voltage: 1.6 to 5.0 V

• Output voltage: 2.5 to 5.5 V, select able in 0.1 V steps.

• Output voltage accuracy: ±2 % max.

• Built-in soft start circuit: 1.0 ms typ.

• Output current 25 mA (VIN=(VOUT(S) × 0.80) V)

• Oscillation frequency: 1.0 MHz typ.

• ON/OFF function: During standby: 1 μA max.

• Ultra-small package: SOT-23-6W

• Lead-free products

 Applications

• Lithium ion battery driven applications

• Local power supply

• Power supply for white LED displ ay backlights

 Packages

Drawing Code

Package Name Package Tape Reel

SOT-23-6W MP006-B MP006-B MP006-B

VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER

S-8821 Series Rev.3.1_00

Seiko Instruments Inc. 2

 Block Diagram

VIN

Switch

control

circuit

SW1

−

CPUMP=0.10 μ

Soft start

circuit ON/OFF

circuit

ON/OFF

PFM control

oscillator

circuit

(1.0 MHz)

Reference

voltage

VOUT

GND

COUT=10 μF

CIN=4.7 μ

Figure 1

VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER

Rev.3.1_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 user ’s request. Refer to

the “Product name” for the meanings of the characters in the product name and “Product name list” for

the full product names.

1. Product name

S-8821 xx A MH – xxx TF G

IC direction in t ape specifications*1

Product name (abbreviatio n)*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 taping sp ecifications at the end of this book.

*2. Refer to the product name list.

2. Product name list

Table 1

Output Voltage SOT-23-6W

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

5.0 V S-882150AMH-M2ZTFG

5.2 V S-882152AMH-M3BTFG

5.5 V S-882155AMH-M3ETFG

Remark Contact the SII sales department for products with an output voltage other than those

specified above.

VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER

S-8821 Series Rev.3.1_00

Seiko Instruments Inc. 4

 Pin Configurations

Table 2

Pin No. Symbol Pin Description

1 VIN Voltage input pin

2 C+ Charge-pump pump capacitor connection pin

(positive pin)

3 C− Charge-pump pump capacitor connection pin

(negative pin)

4 ON/OFF

Shutdown pin

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

6 4

1 3 2

SOT-23-6W

Top view

Figure 2

VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER

Rev.3.1_00 S-8821 Series

Seiko Instruments Inc. 5

 Absolute Maximum Ratings

Table 3

(Ta=25°C unless otherwi se specified)

Items Symbols Absolute Maximum Ratings Units

C+ pin voltage VC+ V

GND−0.3 to VGND+7.5 V

C− pin voltage VC− V

GND−0.3 to VGND+7 V

VIN pin voltage VIN VGND−0.3 to VGND+5.5 V

VOUT pin vol tage VOUT VGND−0.3 to VGND+7 V

ON/OFF pin voltage VON/OFF VGND−0.3 to VIN+0.3 V

300 (When not mounted on board) mW

Power dissipation PD 650*1 mW

Operating ambient temperature Topr −40 to +85 °C

Storage temperatu re Tstg −40 to +125 °C

*1. When mounted on bo ard

[Mounted board]

(1) Board size: 114.3 mm × 76.2 mm × t1.6 mm

(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 exc eeded under any conditions.

(1) When mounted on board (2) When not mounted on board

050 100 150

600

400

200

Power Dissipation P

(mW)

Ambient Temperature Ta (°C)

500

300

100

700

800

050 100 150

300

200

100

Power Dissipation P

(mW)

Ambient Temperature Ta (°C)

250

150

350

400

Figure 3 Power Dissipation of Package

VOLTAGE REGUL ATION STEP-UP CHARGE PUMP DC-DC CONVERTER

S-8821 Series Rev.3.1_00

Seiko Instruments Inc. 6

 Electrical Characteristics

Table 4

(VIN=(VOUT(S) × 0.60) V*1, Ta=25°C unless otherwise specified)

Items Symbols Conditions Min. Typ. Max. Units

Test

circuits

VOUT(S) ≤ 2.9 V 1.6 ⎯ 5.0 V 2

Operation input voltage VIN VOUT(S) > 2.9 V VOUT(S) ×

0.54 ⎯ 5.0 V 2

Output volt age*2 V

OUT(E) IOUT=10 mA VOUT(S) ×

0.98 VOUT(S) VOUT(S) ×

1.02 V 2

VIN=(VOUT(S) × 0.54) V*6 5 ⎯ ⎯ mA 2

VIN=(VOUT(S) × 0.60) V*1 15 ⎯ ⎯ mA 2

Output current*3 I

OUT VIN=(VOUT(S) × 0.80) V 25 ⎯ ⎯ mA 2

Line regulation ΔVOUT1 VIN=(VOUT(S) × 0.60) V*1

to (VOUT(S) − 0.10) V,

IOUT=10 mA ⎯ 50 100 mV 2

Load regulation ΔVOUT2 IOUT=0.1 mA to 10 mA ⎯ 40 80 mV 2

Ripple voltage*4 V

RIP IOUT=10 mA ⎯ 70 ⎯ mVp−p 2

Maximum oscillation

frequency fosc VOUT=(VOUT(S) × 0.60) V,

Measure waveform at C− pin 800 1000 1200 kHz 2

Efficiency*5 η VIN=(VOUT(S) × 0.54) V,

VOUT(S) ≥ 3.0 V, IOUT=5 mA ⎯ 90 ⎯ % 1

Operation consumption

current ISS1 VIN=VOUT(S),

VOUT=(VOUT(S) + 0.5) V ⎯ 35 60 μA 2

St andby consumption

current ISSS VIN=(VOUT(S) × 0.54) V*6 to 5.0 V,

VON/OFF=0 V ⎯ 0.3 1.0 μA 1

ON/OFF pin input

voltage (high level) VSH VIN=(VOUT(S) × 0.54) V*6 to 5.0 V 1.5 ⎯ ⎯ V 1

ON/OFF pin input

voltage (low level) VSL VIN=(VOUT(S) × 0.54) V*6 to 5.0 V ⎯ ⎯ 0.3 V 1

ON/OFF pin input

current (high level) ISH VIN=(VOUT(S) × 0.54) V*6 to 5.0 V −0.1 ⎯ 0.1 μA 1

ON/OFF pin input

current (low level) ISL VIN=(VOUT(S) × 0.54) V*6 to 5.0 V −0.1 ⎯ 0.1 μA 1

Soft start time tSS IOUT=10 mA 0.2 1.0 4.0 ms 1

*1. In case of VOUT ≤ 3.3 V, VIN=2.0 V

*2. V

OUT(E): Actual output voltage

VOUT(S): Specified output voltage

*3. The output current at which the output voltage becomes 97 % of VOUT(E) after grad ually increasing the

output current.

*4. Design assurance

*5. The ideal efficiency is indicated by the following expression.

Efficiency (η)=(VOUT × IOUT) / (2.0 × VIN × IOUT)

*6. In case of VOUT ≤ 2.9 V, VIN=1.6 V

VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER

Rev.3.1_00 S-8821 Series

Seiko Instruments Inc. 7

 Test Circuits

VOUT

GND

ON/OFF

C−

C+

VIN

AA A

4.7 μF

Figure 4

VOUT

GND

ON/OFF

C−

C+

VIN

4.7 μF

0.1 μF

10 μF

Figure 5

VOLTAGE REGUL ATION STEP-UP CHARGE PUMP DC-DC CONVERTER

S-8821 Series Rev.3.1_00

Seiko Instruments Inc. 8

 Operation

1. Basic operation

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.

The output voltage is fed b ack and the voltage split by feedback resistances Rs and Rf and reference

voltage (Vref) are compared by a comparator. This co mparator signal is used to modulate the oscillation

pulse frequency in order to keep the output voltage constant.

VIN

Switch

control

circuit

SW1

−

CPUMP=0.10 μ

Soft start

circuit ON/OFF

circuit

ON/OFF

PFM co ntrol

oscillator

circuit

(

1.0 MHz

)

Reference

voltage

VOUT

GND

COUT=10 μF

CIN=4.7 μ

Figure 6

VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER

Rev.3.1_00 S-8821 Series

Seiko Instruments Inc. 9

2. Step-up Charge Pump

The step-up charge pump steps up the voltage by switching ON/OFF of the SW1 to SW4 switching

transistors.

First, in order to charge the pump capa citance (CPUMP), set SW1 to OFF, SW2 to ON, SW3 to OFF, and

SW4 to ON (charge cycle). Following charging the electricity, in order to discharge the charged

electricity to the output capacitance (COUT), SW1 set the switches as to ON, SW2 to OFF, SW3 to ON,

and SW4 to OFF (dischar ge cycle).

The input voltage can be stepped up to a constant voltage value by repeating this charge cycle and

discharge cycle.

Figure 7 shows the charge cycle, and Figure 8 shows the discharge cycle.

VIN

SW1: OF F

SW3: OFFSW4: ON

SW2: ON

COUT

10 μF

CPUMP

0.10 μF

Current flo

Figure 7

VIN

SW1: ON

SW3: ONSW4: OFF

SW2: OFF

COUT

10 μF

CPUMP

0.10 μFCurrent flow

Figure 8

VOLTAGE REGUL ATION STEP-UP CHARGE PUMP DC-DC CONVERTER

S-8821 Series Rev.3.1_00

Seiko Instruments Inc. 10

3. Shut down 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 simultane ously the operation of all the internal circuit to stop. At this time, the consumption

current is largely reduced, to a level of approximately 0.3 μA.

The structure of the ON/OFF pin is as shown in Figure 9. Since the ON/OFF pin is neithe r p ulled do wn

nor pulled up internally, do not use it in the floating st ate.

When the ON/OFF pin is not used, connect it to the VIN pin.

Table 5

ON/OFF pin Internal circuit VOUT pin vol tage

“H”: Power on Operating Set value

“L”: Power of f Stop VGND level

GND

ON/OFF

VIN

Figure 9

4. Sof t Start Function

The S-8821 Series features a built-in soft start circuit. Upon power application or when the OFFON/ pin

is switched from "L" to "H", the output voltage graduall y rises over the soft start time, and the output

current is gradually output as a result. This soft start function reduces the input current rush.

VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER

Rev.3.1_00 S-8821 Series

Seiko Instruments Inc. 11

 External Capacitor Selection

1. Input and Output Capacitors (CIN, COUT)

The input capacitor (CIN) lo wers the power supply impedance and averages the input current.

The CIN value is selected according to the impedance of the power supply that is used. Select a ceramic

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, it is generally in the range

of 4.7 μF to 10 μF.

For the output cap acitor (COUT), select a ceramic capacitor with a small ESR for smoothing the ripple

voltage. A value of 10 μF is recommended for the ca pacitance valu e. Use of a capacitor with a

capa citance lower than 10 μF results in a larger ripple voltage. Conversely, use of a capacitor with a

capacitance greater than 10 μF results in the output voltage not being able to rise up to setting value

and the impossibility to obt ain the desired output current.

2. Pump Capacitor (CPUMP)

The pump cap acitor (CPUMP) is required for stepping up the volt age. Select a ceramic capacitor with a

small ESR. A capacitance value of 0.10 μF is recommended. Use of a ca pacitor with a capacitance

greater than 0.10 μF results in a larger ripple voltage. Conversely, use of a capacitor with a capacitance

lower than 0.10 μF results in the output voltage not being able to raise up to setting value and the

impossibility to obtain the desired output current.

VOLTAGE REGUL ATION STEP-UP CHARGE PUMP DC-DC CONVERTER

S-8821 Series Rev.3.1_00

Seiko Instruments Inc. 12

 Precautions

• Regarding the wiring to the VIN pin, VOUT pin, C+ pin, C− pin and GND pin, be careful to perform

pattern wiri ng so as to obtain low impedance.

• Always con nect a capacitor to the VOUT pin, C + pin, and C− pin.

• Connect CIN and COUT in the vicinity of the IC and sufficiently strengthen the wiring for GND pin and VIN

pin in order to lower the impedance of the wirin g resistance, etc. High impedance may cause unstable

operation.

Moreover, in selecting CIN and COUT, perform a full evaluation of the actual usag e conditions.

• Connect CPUMP in the vicinity of the IC and sufficiently strengthen the wiring for the C+ pin and C− pin in

order to lower the impedance of the wiring resistance, etc. High impedance may cause instable

operation.

Moreover, in selecting CPUMP, perform a full evaluation of the actual usage conditions.

• The ON/OFF pin is configured as shown in Figure 9 and is neither pulled up or down internally, so do not

use this pin in a floating state. When not using the ON/OFF pin, connect it to the VIN pin.

Moreover, please d o not apply voltage higher than VIN + 0.3 V to an ON/OFF pin. Current flows for a

VIN pin through the protection diod e inside IC.

• Since this IC consists of double step-up circuits, it cannot set more than twice voltage of VIN to VOUT(S).

• Be careful about the usage conditions for the input/output voltages and output current to make sure that

dissipation within the IC does not exceed the allowable power dissipation of the package.

For reference, the calculation of the power consumption in this IC is shown below.

PD=(VIN × 2.0 − VOUT) × (IOUT)

Reference: VIN=4.2 V, VOUT=5.5 V, IOUT=10 mA

D=(4.2 × 2.0 − 5.5) × 0.010=29 mW

• Since the information described herein is subject to change without notice, confirm that this is the latest

one before using.

• Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in

electrostatic protection circuit.

• SII claims no responsibility for any and all disputes a rising out of or in connectio n with any infringe ment

of the product s including this IC upon pat ents owned by a third party.

VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER

Rev.3.1_00 S-8821 Series

Seiko Instruments Inc. 13

 Characteristics (Typical Data)

(1) Output voltage vs. Operation input voltage

S-882133A S-882150A

IOUT=10 mA, Ta=25°C IOUT=10 mA, Ta=25°C

VOUT [V]

1.5

2.0

2.5

3.0

3.5 5.5

3.15

3.10

3.50

3.20

3.25

3.35

3.30

3.40

3.45

4.0

4.5

5.0

VOUT [V]

1.5 2.5 3.0 3.5

5.5

4.80

4.70

5.30

5.20

5.10

5.00

4.90

2.0 4.0

4.5

5.0

VIN [V] VIN [V]

(2) Output voltage vs. Output curre nt

S-882133A S-882150A

VIN=2.0 V, Ta=25°C VIN=3.0 V, Ta=25°C

VOUT [V]

3.15

3.10

3.50

3.40

3.35

3.30

3.25

3.20

3.45

VOUT [V]

010 15

4.70

5.30

5.20

5.10

5.00

4.90

4.80

525

IOUT [mA] IOUT [mA]

(3) Operation consumption vs. Operation input voltage

S-882133A S-882150A

Ta=25°C Ta=25°C

ISS1 [μA]

1.5 3.5 4.0 5.5

5.0 4.5

2.0 2.5 3.0

ISS1 [μA]

1.5 2.5 5.5

3.5

3.0 4.0

2.0 4.5

5.0

VIN [V] VIN [V]

VOLTAGE REGUL ATION STEP-UP CHARGE PUMP DC-DC CONVERTER

S-8821 Series Rev.3.1_00

Seiko Instruments Inc. 14

(4) Ripple voltage vs. Operation input voltage

S-882133A S-882150A

IOUT=10 mA, Ta=25°C IOUT=10 mA, Ta=25°C

VRIP [mVp-p]

1.5

3.0

3.5 4.0

5.0

5.5

100

4.5

2.0

2.5

VRIP [mVp-p]

1.5 2.5 3.0 3.5

5.0 5.5

100

4.5

4.0

2.0

VIN [V] VIN [V]

(5) Efficiency*1 vs. Operation input voltage

S-882133A S-882150A

IOUT=10 mA, Ta=25°C IOUT=10 mA, Ta=25°C

η [%]

1.5

2.0

3.5 4.5

5.5

100

4.0

5.0

3.0

2.5

η [%]

1.5 2.5 3.5

5.5

100

4.0

3.0 4.5

5.02.0

VIN [V] VIN [V]

*1. The ideal efficiency is indicated by the following expression.

Efficiency (η)=(VOUT × IOUT) / (2.0 × VIN × IOUT)

(6) Maximum oscillation frequency vs. Operation input voltage

S-882133A S-882150A

Ta=25°C Ta=25°C

fOSC [kHz]

1.5

2.0

2.5

3.5

5.0 5.5

700

800

900

1000

1100

1200

1300

4.0

4.5

3.0

fOSC [kHz]

1.5 2.0 2.5 4.0

5.0 5.5

700

800

900

1000

1100

1200

1300

4.5

3.5

3.0

VIN [V] VIN [V]

VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER

Rev.3.1_00 S-8821 Series

Seiko Instruments Inc. 15

(7) Load fluctuation

S-882133A S-882150A

VIN=2.0 V VIN=3.0 V

CH1

CH2

1 mA

10 mA

CH1

CH2

1 mA

10 mA

[1 ms/div.] [1 ms/div.]

CH1: VOUT [20 mV/div.]

CH2: IOUT [2 mA/div.] CH1: VOUT [20 mV/div.]

CH2: IOUT [2 mA/div.]

(8) Input voltage fluctuation

S-882133A S-882150A

IOUT=10 mA IOUT=10 mA

CH1

CH2

1.8 V

3.3 V

CH1

CH2 3.0 V

5.0 V

[1 ms/div.] [1 ms/div.]

CH1: VOUT [20 mV/div.]

CH2: VIN [1 V/div.]

CH1: VOUT [20 mV/div.]

CH2: VIN [1 V/div.]

2.9±0.2

0.15

1.9±0.2

123

No.

TITLE

SCALE

UNIT mm

0.4

0.95

+0.1

-0.08

0.95

+0.1

-0.05

No. MP006-B-P-SD-1.0

SOT236-B-PKG Dimensions

MP006-B-P-SD-1.0

Seiko Instruments Inc.

No. MP006-B-C-SD-1.0

SOT236-B-Carrier Tape

MP006-B-C-SD-1.0

Seiko Instruments Inc.

123

ø1.5 +0.1

-0 2.0±0.05

ø1.0 +0.2

-0 4.0±0.1

1.4±0.2

0.25±0.1

3.2±0.2

Feed direction

4.0±0.1(10 pitches:40.0±0.2)

No.

TITLE

SCALE

UNIT

12.5max.

9.0±0.3

ø13±0.2

(60°) (60°)

QTY 3,000

SOT236-B-Reel

MP006-B-R-SD-1.0

Seiko Instruments Inc.

No. MP006-B-R-SD-1.0

Enlarged drawing in the central part

No.

TITLE

SCALE

UNIT

•

The information described herein is subject to change without notice.

• Seiko Instruments Inc. is not responsible for any problems caused by circuits or diagrams described herein

whose related industrial properties, patents, or other rights belong to third parties. The application circuit

examples explain typical applications of the products, and do not guarantee the success of any specific

mass-production design.

• When the products described herein are regulated products subject to the Wassenaar Arrangement or other

agreements, they may not be exported without authorization from the appropriate governmental authority.

• 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.

• Although Seiko Instruments Inc. exerts the greatest possible effort to ensure high quality and reliability, the

failure or malfunction of semiconductor products may occur. The user of these products should therefore

give thorough consideration to safety design, including redundancy, fire-prevention measures, and

malfunction prevention, to prevent any accidents, fires, or community damage that may ensue.