LT3465 LINER [Linear Technology], LT3465 Datasheet
LT3465
Available stocks
Related parts for LT3465
LT3465 Summary of contents
Page 1
... LEDs are disconnected, one- pin shutdown and dimming control. The LT3465 has internal soft-start. The LT3465 switches at 1.2MHz, allowing the use of tiny external components. The faster LT3465A switches at 2.4MHz. Constant frequency switching results in low input noise and a small output capacitor. Just 0. required for 3 5-LED applications ...
Page 2
... V Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LT3465E/LT3465AE are guaranteed to meet performance specifications from Specifications over the – operating temperature range are assured by design, characterization and correlation with statistical process controls. ...
Page 3
... SWITCH CURRENT (mA) 3465A G01 CTRL 250 200 150 100 0.5 1.5 CONTROL VOLTAGE (V) 3465A G04 Switching Waveforms (LT3465 10V/DIV I L 100mA/DIV V OUT 100mV/DIV V = 3.6V 200ns/DIV IN 3465A G07a 4 LEDs 20mA Schottky Forward Voltage Drop 300 ...
Page 4
... TEMPERATURE ( C) 3465A G09 V = 3.6V, 4 LEDs IN 85 LT3465 LT3465A 80 75 15mA –50 0 TEMPERATURE ( CTIO S V (Pin 1): Output Pin. Connect to output capacitor and OUT LEDs. Minimize trace between this pin and output capaci- tor to reduce EMI ...
Page 5
... The block diagram for the LT3465A (not shown) is identical except that the oscillator frequency is 2.4MHz. Minimum Output Current The LT3465 can drive a 3-LED string at 1.5mA LED current without pulse skipping. As current is further reduced, the device will begin skipping pulses. This will – ...
Page 6
... LEDs at a 0.2mA load. Peak inductor current is less than 30mA. Inductor Selection inductor is recommended for most LT3465 appli- cations. Although small size and high efficiency are major concerns, the inductor should have low core losses at 1.2MHz and low DCR (copper wire resistance). Some inductors in this category with small size are listed in Table 1 ...
Page 7
... U U APPLICATIO S I FOR ATIO Soft-Start (LT3465) The LT3465 has an internal soft-start circuit to limit the input current during circuit start-up. The circuit start-up waveforms are shown in Figure 5. I 50mA/DIV IN V 5V/DIV OUT V 100mV/DIV FB CTRL 5V/DIV V = 3.6V 200 s/DIV IN 4 LEDs, 20mA ...
Page 8
... In the cases of output open circuit, when the LEDs are disconnected from the circuit or the LEDs fail, the V is clamped at 30V. The LT3465 and OUT LT3465A will then switch at a very low frequency minimize the input current. V output open circuit are shown in the Typical Performance Characteristics ...
Page 9
... OUT 3465A TA01a Li-Ion to Three White LEDs OUT 0. 3465A TA02a LT3465/LT3465A LEDs LT3465 LT3465A LED CURRENT (mA) 3465A TA01b LEDs LT3465 LT3465A LED CURRENT (mA) 3465A TA02b 3465af 9 ...
Page 10
... Li-Ion to Five White LEDs OUT LT3465 LT3465A CTRL FB GND TAIYO YUDEN JMK107BJ105 TAIYO YUDEN GMK212BJ224 OUT L1: MURATA LQH32CN220 3. LEDs LT3465 LT3465A LED CURRENT (mA) 3465A TA03b C OUT 0.22 F 3465A TA03a 3465af ...
Page 11
... U S6 Package 6-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1636) 1.22 REF 1.50 – 1.75 2.80 BSC 1.4 MIN (NOTE 4) 0.95 BSC 0.80 – 0.90 1.00 MAX 0.09 – 0.20 (NOTE 3) LT3465/LT3465A 2.90 BSC (NOTE 4) PIN ONE ID 0.30 – 0.45 6 PLCS (NOTE 3) 0.01 – 0.10 1.90 BSC S6 TSOT-23 0302 11 3465af ...
Page 12
... FB GND C : TAIYO YUDEN JMK107BJ105 TAIYO YUDEN GMK212BJ474 OUT L1: MURATA LQH32CN470 (LT3465) L1: MURATA LQH32CN220 (LT3465A) RELATED PARTS PART NUMBER DESCRIPTION LT1618 Constant Current, Constant Voltage, 1.4MHz, High Efficiency Boost Regulator LT1932 Constant Current, 1.2MHz, High Efficiency White LED Boost Regulator LT1937 Constant Current, 1 ...