el7551 Intersil Corporation, el7551 Datasheet
el7551
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el7551 Summary of contents
Page 1
... QSOP package. With proper external components, the whole converter fits into a less 2 than 0.4 in area. The minimal external components and small size make this EL7551 ideal for desktop and portable applications. The EL7551 is specified for operation over the -40°C to +85°C temp erature range. Pinout ...
Page 2
... Output Temperature Stability FB_TC I Feedback Input Pull Up Current Input High Level EN_HI V EN Input Low Level EN_LO I Enable Pull Up Current EN 2 EL7551 Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +15 0°C +0.3V Operating Ambient Temperature . . . . . . . . . . . . . . . .-40°C to +85°C IN +0.3V Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . +135° ...
Page 3
... Voltage feedback input. Connected to an external resistor divider between VOUT and GND. A 125nA pull-up current forces VOUT the event that FB is floating. 15 VREF Bandgap reference bypass capacitor. Typically 0.1µF to GND. 16 PGND Ground return of the regulator. 3 EL7551 5V 25° 1.2nF, unless otherwise specified ...
Page 4
... V =3.3V O 100 V =4. = =5. 0.2 0.4 Load Current I Line Regulation V =3.3V O 0.6 0.5 0.4 I =0.1A 0.3 O 0.2 0 -0.1 -0.2 -0.3 -0.4 4.5 4.7 4 EL7551 0.25 V =1.8V V =1. 0.2 0.15 V =1. =1V O 0.1 0.05 F =500kHz S L=Coilcraft DO3316P-472 0 0.6 0.8 1 (A) O 0.6 0.4 0.2 0 -0.2 -0.4 F =500kHz S L=Coilcraft DO3316P-472 -0.6 0.6 0.8 1 (A) O 1.258 1.256 1.254 1.252 1.25 1.248 1.246 1 ...
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... Temperature (°C) Switching Frequency vs C 1400 1200 1000 800 600 400 200 0 0 200 400 C OSC Transient Response V =5V, V =3.8V, I =0A- EL7551 (Continued) 0.96 0.94 0.92 0.9 0.88 0.86 0.84 0.82 0 120 -40 OSC ' 600 800 1000 (pF ...
Page 6
... Shut-Down V =5V, V =3.8V Block Diagram Controller Supply 39: VDD 0.1µF EN SGND 6 EL7551 (Continued) Releasing Short-Circuit Protection 0.1µF 270pF VREF COSC Voltage Thermal Oscillator Reference Shut-down Power FET PWM Drivers Controller ...
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... Applications Information Circuit Description General The EL7551 is a fixed frequency, current mode controlled DC:DC converter with integrated N-channel power MOSFETs and a high precision reference. The device incorporates all the active circuitry required to implement a cost effective, user-programmable 1A synchronous step- down regulator suitable for use in DSP core power supplies. ...
Page 8
... FET, via the VHI pin. A value of 0.1µF for CVHI is recommended. Reference A 1.5% temperature compensated bandgap reference is integrated in the EL7551. The external VREF capacitor acts as the dominant pole of the amplifier and can be increased in size to maximize transient noise rejection. A value of 0.1µF is recommended. ...
Page 9
... In addition, a solid ground plane is always helpful for the EMI performance. The demo board is a good example of layout based on these principles. Please refer to the EL7551 Application Brief for the layout. All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. ...