Rev.1.0
_10
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 drawing code: MP006-B)
•
SOT-23-6W
•
6-Pin SNB(B) (Package drawing code: BD006-A)
•
6-Pin SON(A) (Package drawing code: 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.1.0
_10
VOUT
C
OUT
=10
µF
R
f
SW4
ON/OFF
circuit
Reference
voltage
ON/OFF
GND
Figure 1
2
Seiko Instruments Inc.
Rev.1.0
_10
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
Product name (abbreviation)
*2
*1
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)
6-Pin SON(A)
3.3 V ±2.0%
S882133AMH-M2I-TF
S882133ABD-M2I-TF
S882133APB-M2I-TF
5.0 V ±2.0%
S882150AMH-M2Z-TF
S882150ABD-M2Z-TF
S882150APB-M2Z-TF
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
Table 2
Pin No.
1
2
3
4
5
6
1
2
Figure 2
3
Symbol
VIN
C+
C−
ON/OFF
GND
VOUT
Pin Description
Rev.1.0
_10
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
6-Pin SNB(B)
Top view
6 5 4
Table 3
Pin No.
1
2
3
4
5
6
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
Figure 3
6-Pin SON(A)
Top view
6
5
4
Pin No.
1
2
3
4
5
6
1
2
3
Symbol
ON/OFF
GND
C−
C+
VIN
VOUT
Table 4
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
Figure 4
4
Seiko Instruments Inc.
Rev.1.0
_10
VOLTAGE REGULATION STEP-UP CHARGE PUMP DC-DC CONVERTER
S-8821 Series
Absolute Maximum Ratings
Table 5
Items
C+ pin voltage
C− pin voltage
VIN pin voltage
VOUT pin voltage
ON/OFF pin voltage
Operating temperature range
Storage temperature range
Power dissipation
Symbols
V
C+
V
C−
V
IN
V
OUT
V
ON/OFF
T
OPR
T
STG
P
D1
P
D2
P
D3
(Ta=25°C unless otherwise specified)
Absolute Maximum Ratings
Units
V
V
GND
−0.3
to V
GND
+7.5
V
GND
−0.3
to V
GND
+7
V
GND
−0.3
to V
GND
+5.5
V
GND
−0.3
to V
GND
+7
V
GND
−0.3
to V
IN
+0.3
−40
to
+85
°C
−40
to
+125
SOT-23-6W
300
mW
6-Pin SON(A)
200
6-Pin SNB(B)
90
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.
Seiko Instruments Inc.
5
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