SM8120A
SM8120A is White LED Driver manufactured by Nippon Precision Circuits Inc.
URES
PINOUT
(Top view)
I I I I I I I I I
Boost-up control using PFM White LED of 2-4 lights (connected in series) lighted Output current value can be set by external resistors (51Ω: 9.8m A, 33Ω: 15.2m A, 24Ω: 20.8m A) Brightness adjustable by control to FB pin or CE pin Current variation among LED decreased by high precision High efficient drive by step-up model Supply voltage range: 2.4 to 5.5V Maximum output voltage: 24V Quiescent current: 80µA (typ) Standby current: 1.0µA (max) RON (Switching MOS-Tr): 2Ω (typ) Maximum switching frequency: 500k Hz (typ) Output current detection accuracy: ± 2% Small package: SOT23-5
PACKAGE DIMENSIONS
(Unit: mm)
I I I I I I I I I
Cellular phone Pager Digital still camera Handy terminal PDAs Portable games White LED drive LCD bias supply Flash memory supply
+ 0.2 1.6
- 0.1 + 0.2 2.8
- 0.3
1.9 ± 0.2 2.9 ± 0.2 0.4 ± 0.1
+ 0.1 0.15
- 0.05
0.12 M 1.1 ± 0.1 0 ~ 0.10
0.8 ± 0.1
0.95 0.1
ORDERING INFORMATION
Device SM8120AH Package SOT23-5
NIPPON PRECISION CIRCUITS INC.- 1
0.20MIN
APPLICATIONS
BLOCK DIAGRAM
VDD FB Buff Q R VREF OSC CE SOFT START S P
PIN DESCRIPTION
Number 1 2 3 4 5 Name VDD VSS SW FB CE I/O
- - O I Ip1 Power supply GND Coil switching Feed back (Output current detection) Chip enable (High active) Description
1. Input with built-in pull-down resistor
NIPPON PRECISION CIRCUITS INC.-...
