Rev.3.1
_00
VOLTAGE REGULATION
STEP-UP CHARGE PUMP DC-DC CONVERTER
S-8821 Series
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:
•
Output voltage:
•
Output voltage accuracy:
•
Built-in soft start circuit:
•
Output current
•
Oscillation frequency:
•
ON/OFF function:
•
Ultra-small package:
•
Lead-free products
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 (V
IN
=(V
OUT(S)
×
0.80) V)
1.0 MHz typ.
During standby: 1
μA
max.
SOT-23-6W
Applications
•
Lithium ion battery driven applications
•
Local power supply
•
Power supply for white LED display backlights
Packages
Package Name
Package
Drawing Code
Tape
Reel
SOT-23-6W
MP006-B
MP006-B
MP006-B
Seiko Instruments Inc.
1
VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER
S-8821 Series
Block Diagram
VIN
C
IN
=4.7
μF
SW1
Rev.3.1
_00
VOUT
C
OUT
=10
μF
R
s
C+
C
PUMP
=0.10
μ
F
SW2
Switch
control
circuit
PFM control
oscillator
circuit
(1.0 MHz)
+
-
R
f
C−
SW3
Soft start
circuit
SW4
ON/OFF
circuit
Reference
voltage
ON/OFF
GND
Figure 1
2
Seiko Instruments Inc.
Rev.3.1
_00
VOLTAGE REGULATION STEP-UP 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 and “Product name list” for
the full product names.
1. Product name
S-8821
xx
A
MH
– xxx
TF
G
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 taping specifications 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.
Seiko Instruments Inc.
3
VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER
S-8821 Series
Pin Configurations
SOT-23-6W
Top view
6
5
4
Rev.3.1
_00
Table 2
Pin No.
1
2
3
4
Symbol
VIN
C+
C−
ON/OFF
GND
VOUT
Pin Description
Voltage input pin
Charge-pump pump capacitor connection pin
(positive pin)
Charge-pump pump capacitor connection pin
(negative pin)
Shutdown pin
High level (H) : normal operation (step-up)
Low level (L) : step-up halt (all circuit halt)
GND pin
Voltage output pin
1
2
3
5
6
Figure 2
4
Seiko Instruments Inc.
Rev.3.1
_00
VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER
S-8821 Series
Absolute Maximum Ratings
Table 3
Items
C+ pin voltage
C− pin voltage
VIN pin voltage
VOUT pin voltage
ON/OFF pin voltage
Power dissipation
Symbols
V
C+
V
C−
V
IN
V
OUT
V
ON/OFF
P
D
(Ta=25°C unless otherwise specified)
Absolute Maximum Ratings
Units
V
V
GND
−0.3
to V
GND
+7.5
V
V
GND
−0.3
to V
GND
+7
V
V
GND
−0.3
to V
GND
+5.5
V
V
GND
−0.3
to V
GND
+7
V
V
GND
−0.3
to V
IN
+0.3
300 (When not mounted on board)
mW
*1
mW
650
−40
to
+85
°C
−40
to
+125
°C
Operating ambient temperature T
opr
Storage temperature
T
stg
*1.
When mounted on board
[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 exceeded under any conditions.
(2) When not mounted on board
400
Power Dissipation P
D
(mW)
150
350
300
250
200
150
100
50
0
0
50
100
150
(1) When mounted on board
800
Power Dissipation P
D
(mW)
700
600
500
400
300
200
100
0
0
50
100
Ambient Temperature Ta (°C)
Ambient Temperature Ta (°C)
Figure 3 Power Dissipation of Package
Seiko Instruments Inc.
5
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