(*Vcc =15 V, RT=10kΩ ,CT=3.3nF, TA=0 to 70° C, unless otherwise specified )
Characteristics Symbol Test Conditions Min Typ Max Unit
Reference Section
Reference Output Voltage VREF TJ =25°C, IREF=1mA 4.9 5.0 5.1 V
Line Regulation ∆VREF 12V≤VCC≤25V 6.0 20
Load Regulation ∆ VREF 1mA≤ IREF≤20mA 6.0 25 mV
Short Circuit Output
Current ISC TA=25°C100 180 mA
Oscillator Section
Oscillation Frequency f TJ=25°C47 52 57 KHz
Frequency change with
Voltage ∆f/∆Vcc 12V≤VCC≤25V 0.05 1.0 %
Oscillator Amplitude V(OSC) (Peak to Peak) 1.6 V
Error Amplitude Section
Input Bias Current IBIAS VFB=3V -0.1 -2 µA
Input Voltage VI(E,A) Vpin1=2.5V 2.5 2.58 V
Open Loop Voltage Gain AVOL 2V≤VO≤4V 65 90
Power Supply Rejection
ratio PSRR 12V≤VCC≤25V 60 70 dB
Output Sink Current ISINK Vpin2 =2.7V, Vpin1=1.1V 2 7 mA
Output Source current ISOURCE Vpin2=2.3V, Vpin1=5V -0.5 -1.0 mA
High Output Voltage VOH Vpin2=2.3V,RL=15kΩ to
GND 5.0 6.0
Low Output Voltage VOL Vpin2=2.7V,RL=15kΩ t o
PIN 8 0.8 1.1
V
Current Sense Section
Gain GV(Note 1& 2) 2.85 3.0 3.15 V/V
Maximum Input Signal VI(MAX) Vpin1 =5V(note 1) 0.9 1.0 1.1 V
Supply Voltage rejection SVR 12V≤Vcc≤25V(note 1) 70 dB
Input Bias Current IBIAS Vpin3= 3V -3.0 -10 µA
Output Section
Isink=20mA 0.08 0.4
Low Output Voltage VOL Isink=200mA 1.4 2.2
Isink=20mA 13 13.5
High Output Voltage VOH Isink=200mA 12 13.0
V
Rise Time tRTJ=25°C, CL =1nF(note
3) 45 150 nS
Fall time tFTJ=25°C, CL =1nF(note
3) 35 150 nS
Undervoltage Lockout Section
LND3842A,B/44A,B 14.5 16.0 17.5
Start Threshold VTH(ST) LND3842A,B/45A,B 7.8 8.4 9.0 V
LND3842A,B/44A,B 8.5 10 11.5
Min. Operating Voltage
(After Turn on) VOPR(MIN) LND3842A,B/45A,B 7.0 7.6 8.2 V
PWM Section
LND3842A,B/43A,B 95 97 100
Max. Duty Cycle D(MAX) LND3842A,B/45A,B 47 48 50 %
Min. Duty cycle D(MAX) 0
Total Standby Current
LND3842A/43A/44A/45A 0.17 0.3
Start-Up current IST LND3842B/43B/44B/45B 0.45 1 mA
Operating Supply Current ICC(OPR) VPIN3=VPIN2 =0V 13 17 mA
Zener Voltage VZICC=25mA 30 38 V
ELECTRICAL CHARACTERISTICS
LND3842/43/44/45
• Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com •
*Adjust VCC above the start threshold before setting it to 15V.