lt3473a Linear Technology Corporation, lt3473a Datasheet
lt3473a
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lt3473a Summary of contents
Page 1
... Operation at Light Load ■ Constant Switching Frequency: 1.2MHz ■ Thermal Shutdown ■ Input Range: 2.2V to 16V ■ Low Profile (3mm × 3mm) DFN Package (LT3473) ■ Low Profile (4mm × 3mm) DFN Package (LT3473A) U APPLICATIO S ■ OLED Bias ■ CCD Bias U TYPICAL APPLICATIO PGOOD CTRL 6.8µ ...
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... MUST BE SOLDERED TO PCB (NOTE 3) CONDITIONS SHDN = 3V, Not Switching SHDN = 0V 3V < V < 16V 1.27V CTRL = 0.5V CTRL = 1V CTRL = 2V CTRL = 0.5V ORDER PART TOP VIEW NUMBER LT3473AEDE IN 10 SHDN 13 9 PGOOD 8 CTRL PART MARKING DE PACKAGE 3473A = 43° 25°C. A MIN TYP MAX 2 ...
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... Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LT3473EDD and LT3473AEDE are guaranteed to meet performance specifications from 0°C to 70°C. Specifications over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls ...
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... LT3473/LT3473A W U TYPICAL PERFOR A CE CHARACTERISTICS Sleep Mode Quiescent Current 105 SHDN = 100 95 90 – 100 TEMPERATURE (°C) 3473 G04 Switch V CE(SAT) 450 400 350 300 250 200 150 100 200 400 600 800 1000 1200 SWITCH CURRENT (mA) ...
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... EMI. Exposed Pad (Pin 9/Pin 13): Ground. Solder directly to PCB ground plane through multiple vias under the pack- age for optimum thermal performance. LT3473A Only NB1 (Pin 3): NPN1 Base. NE1 (Pin 4): NPN1 Emitter. NB2 (Pin 5): NPN2 Base. NE2 (Pin 6): NPN2 Emitter. ...
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... SHDN IN ERROR AMPLIFIER – BTH V REF POWER SECTION – COMPARATOR Σ RAMP 1.2MHz GENERATOR OSCILLATOR Figure 2. LT3473A Block Diagram 8 SW CAP 1 Q2 ENABLE OUT 2 PNP DRIVER Q1 DRIVER – 3437 F01 12 SW CAP 1 Q2 ENABLE OUT 2 PNP DRIVER ...
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... L 500mA/DIV 55mA I LOAD 5mA 3473 AI04 V = 3.6V 500µs/DIV 20V OUT V OUT 10V/DIV IL 500mA/DIV SHDN 2V/DIV 3473 AI07 LT3473/LT3473A increases causing A1 C Transient Response V OUT 200mV/DIV I L 200mA/DIV 11mA I LOAD 1mA 3473 AI02 500µs/DIV 20V OUT Transient Response ...
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... LT3473/LT3473A U U APPLICATIO S I FOR ATIO resulting sum is fed into the positive terminal of the PWM comparator A2. When this voltage exceeds the level of the error signal V , the SR latch is reset, turning off the power C switch Q1. The error amplifier sets the peak current level to keep the output in regulation. If the error amplifier’ ...
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... The drive circuit 0.47 1.83 maintains the PNP at the edge of saturation, adaptively 0.47 0.58 according to the load, thus yielding the best compromise 0.47 0.67 between V loss. To remain stable, it requires a bypass capacitor connected between the OUT pin and the CAP pin or LT3473/LT3473A R 2 ⎛ ⎞ V • ⎜ ⎟ REF ⎝ ...
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... CESAT REF Auxiliary NPN Devices (LT3473A Only) The LT3473A has two auxiliary NPNs as shown in the Block Diagram that can provide intermediate outputs less than OUT. The collectors of the NPNs are connected to the OUT pin internally. Each NPN can dissipate 100mW safely and has a minimum beta of 60 ...
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... LTC DWG # 05-08-1708) 4.00 ±0.10 (2 SIDES) 0.65 ±0.05 PIN 1 TOP MARK (NOTE 6) PACKAGE OUTLINE 0.200 REF 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE LT3473/LT3473A R = 0.115 0.38 ± 0.10 TYP 5 8 3.00 ±0.10 1.65 ± 0.10 (4 SIDES) (2 SIDES) (DD8) DFN 1203 4 1 0.25 ± ...
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... LT3473/LT3473A U TYPICAL APPLICATIO OLED Bias 100k PGOOD OUT CTRL L1 6.8µH LT3473 4.2V CAP V IN 20k SHDN GND 100nF 4.7µ TAIYO YUDEN JMK107BJ475 TAIYO YUDEN GMK212BJ474 INT C : TAIYO YUDEN GMK325BJ225 OUT L1: TOKO A915AY-6R8M (TYPE D53LC) RELATED PARTS PART NUMBER ...