Rev.1.1
_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:
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, 6-Pin SNB(B), 6-Pin SON(A)
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
6-Pin SNB(B)
6-Pin SON(A)
MP006-B
BD006-A
PB006-A
MP006-B
BD006-A
PB006-A
MP006-B
BD006-A
PB006-A
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
R
s
C+
C
PUMP
=0.10
µF
SW2
Switch
control
circuit
C−
SW3
Soft start
circuit
PFM control
oscillator
circuit
(1.0 MHz)
+
-
Rev.1.1
_00
VOUT
C
OUT
=10
µF
R
f
SW4
ON/OFF
circuit
Reference
voltage
ON/OFF
GND
Figure 1
2
Seiko Instruments Inc.
Rev.1.1
_00
VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER
S-8821 Series
Selection Guide
•
The output voltage and packages for the S-8821 Series can be selected at the user’s request. Refer to
the “Product name selection guide” for the meanings of the characters in the product name and “Product
name list” for the full product names.
1. Product name selection guide
S-8821
xx
A
xx
– xxx
–
TF
IC direction in tape specifications
*1
Product name (abbreviation)
*2
Package name (abbreviation)
MH: SOT-23-6W
BD: 6-Pin SNB(B)
PB: 6-Pin SON(A)
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
6-Pin SNB(B)
3.0 V
S-882130AMH-M2F-TF
S-882130ABD-M2F-TF
3.3 V
S-882133AMH-M2I-TF
S-882133ABD-M2I-TF
3.6 V
S-882136AMH-M2L-TF
―
4.5 V
S-882145AMH-M2U-TF
―
5.0 V
S-882150AMH-M2Z-TF
S-882150ABD-M2Z-TF
5.5 V
S-882155AMH-M3E-TF
―
Remark
Contact the SII sales department for products with an output
specified above.
6-Pin SON(A)
S-882130APB-M2F-TF
S-882133APB-M2I-TF
―
―
S-882150APB-M2Z-TF
―
voltage other than those
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.1.1
_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
6-Pin SNB(B)
Top view
6 5 4
Table 3
Pin No.
1
2
3
Symbol
VOUT
ON/OFF
GND
C−
C+
VIN
Pin Description
Voltage output pin
Shutdown pin
High level (H) : normal operation (step-up)
Low level (L) : step-up halt (all circuit halt)
GND pin
Charge-pump pump capacitor connection pin
(negative pin)
Charge-pump pump capacitor connection pin
(positive pin)
Voltage input pin
1
2
3
4
5
6
*1
Bottom view
1 2 3
*1.
6 5 4
Connect the heatsink of
back side at shadowed
area to the board, and
set
electric
potential
open or GND.
However, do not use it as
the function of electrode.
Figure 3
4
Seiko Instruments Inc.
Rev.1.1
_00
VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER
S-8821 Series
6-Pin SON(A)
Top view
6
5
4
Table 4
Pin No.
1
2
3
4
5
6
Symbol
ON/OFF
GND
C−
C+
VIN
VOUT
Pin Description
Shutdown pin
High level (H) : normal operation (step-up)
Low level (L) : step-up halt (all circuit halt)
GND pin
Charge-pump pump capacitor connection pin (negative pin)
Charge-pump pump capacitor connection pin (positive pin)
Voltage input pin
Voltage output pin
1
2
3
Figure 4
Seiko Instruments Inc.
5
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