L1937 Datasheet, PDF (2/7 Pages) Unisonic Technologies – WHITE LED STEP-UP CONVERTER

UTC L1937
BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
( PIN 6 FOR SOT-363 ^VIN
FB
SW
PACKAGE ) ⁵
3
1
VREF
1.25V
SHDN
4
-
95mV A1
+
COMPARATOR
DRIVER
-
A2
Rc ⁺
RSQ
Q1
Cc
Ʋ
+
0.2Ƹ
-
RAMP
GENERATOR
SHUTDOWN
2 GND
1.2MHz
OSCILIATOR
( PINS 2 AND 5 FOR
SOT-363 PACKAGE )


ABSOLUTE MAXIMUM RATINGS
PARAMETER
Input Voltage
SW Voltage
FB Voltage
SHDN Voltage
Operating Temperature
Storage Temperature
Maximum Junction Temperature
Lead Temperature (Soldering, 10 sec)
SYMBOL
VIN
VSW
VFB
VSHDN
Topr
Tstg
Tj
TLead
RATINGS
10
36
10
10
-40 ~ +85
-65 ~ +150
125
300
UNIT
V
V
V
V
Ċ
Ċ
Ċ
Ċ
ELECTRICAL CHARACTERISTICS (Ta=25Ċ, VIN=3V, VSHDN=3V, unless otherwise noted.)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNIT
Operating Voltage
VIN
10 V
Feedback Voltage
VFB ISW=100mA,Duty Cycle=66%
86 95 104 mV
FB Pin Bias Current
IFB
10 45 100 nA
Supply Current
Icc
SHDN=0V
1.9 2.5 mA
0.1 1.0 µA
Switching Frequency
fosc
0.8 1.2 1.6 MHz
Maximum Duty Cycle
DC
85 90
%
Switch Current Limit
ISW
320
mA
Switch VCESAT
VCESAT(SW) ISW=250mA
350
mV
Switch Leakage Current
ISW(OFF) VSW=5V
0.01 5 µA
SHDN Voltage High
VIH
1.5
V
SHDN Voltage Low
VIL
0.4 V
SHDN Pin Bias Current
ISHDN
65
µA
UTC UNISONIC TECHNOLOGIES CO., LTD. 2
QW-R103-021,A