S1F81210Y0A Epson Electronics America, Inc., S1F81210Y0A Datasheet - Page 5

• Manufacturer Part Number: S1F81210Y0A
• Description: Step-up Dc-dc Converter
• Manufacturer: Epson Electronics America, Inc.

1. OVERVIEW
2. FEATURES
3. BLOCK DIAGRAM
S1F81210Y0A (Rev.1.0)
● White LED of 2-6 lights (connected in series) lighted
● Output current value can be set by external resistors
● Brightness adjustable by PWM control of CE pin
● Current variation among LED decreased by high precision
● High efficient drive by step-up model
● Small package (SOT23-5)
● Supply voltage range
● Maximum output voltage
● Quiescent current
● Standby current
● R
● Switching frequency
● Output current detection accuracy ±2%
realizing 25V output supply as maximum value, white LED of 2–6 lights connected in series can be lighted.
By connecting in series, current variation among LED is eliminated. Current value sent to white LED can be
set by external resistors.
The S1F81210Y0A is a high efficiency step-up DC-DC converter. Due to high voltage CMOS process
In addition, brightness can also be adjusted by PWM control to CE (chip enable) pin.
(51Ω:9.8mA, 33Ω:15.2mA, 24Ω:20.8mA)
ON
(Switching MOS-Tr)
VDD
CE
SW
VSS
2.3 to 5.5V
25V
400μA (typ)
2Ω (Typ.)
1.0MHz (Typ.)
1.0μA (Max.)
Buff
EPSON
COMP
PWM
GENERATOR
RAMP
OSC
ERR
AMP
START
VREF
SOFT
FB
1. OVERVIEW
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