el7556b Intersil Corporation, el7556b Datasheet
el7556b
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el7556b Summary of contents
Page 1
... OUTEN to provide automatic thermal shutdown. Adjustable oscillator frequency and slope compensation allow added flexibility in overall system design. The EL7556B is available in a 28-pin SO package and is specified for operation over the full -40°C to +85°C temperature range. Pinout ...
Page 2
... OT V VCC2DET, OUTEN Input High IH V VCC2DET, OUTEN Input Low IL V Powergood Drive High OH PWGD V Powergood Drive Low OL PWGD 2 EL7556B Output Pins . . . . . . . . . . . . . . . -0.3V below GND, +0.3V above V Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . 135°C Peak Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V 1nF 470pF OSC ...
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... Output Leakage to V LEAK Composite FET Resistance DSON R R Tempco DSONTC DSON t FET break before make delay BRM t High side FET minimum on time (LEB) LEB 3 EL7556B = 5V 1nF 470pF OSC SLOPE A CONDITIONS REF 0<I <100µA LOAD 10mA DD LOAD 0.2V< ...
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... SLOPE 3.54 3.53 3.52 I =0.5A 3.51 OUT 3.50 3.49 I =3A OUT 3.48 I =6A OUT 3.47 3.46 4.5 5 Line Regulation vs C SLOPE V =V =5.0V ±10 0.8 0.7 0.6 0.5 V =3.5A OUT 0.4 0.3 0.2 0.1 V =1A OUT 0 100 C SLOPE 4 EL7556B 100 V =4. =25° 4.5 5.5 6.5 (A) 3.54 3.53 3.52 3.51 3.50 3.49 3.48 3.47 T =25°C A 3.46 5.5 (V) (I =3A) OUT 0.6 T =25°C A 0.5 0.4 0.3 V =2.5A OUT 0.2 0.1 0.0 125 150 175 (pF) ...
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... C OUT SLOPE (V =5.0V, I =0.5A) IN LOAD 1.5 1.0 0.5 V =1V OUT 0.0 -0.5 -1.0 V =3.5V OUT -1.5 -2.0 -2.5 -3 100 C SLOPE OSC OSC 10000 1000 100 100 C OSC 5 EL7556B (Continued) 0.8 T =25°C A 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 125 150 175 (pF) 1.5 1.0 0.5 V =2.5V OUT 0.0 -0.5 -1.0 T =25°C A -1.5 125 150 175 (pF) 520 T =25°C A 510 500 490 480 ...
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... A 45 OUTEN =5. =4. 200 400 600 F (kHz) OSC Power On Reset 40 T =25°C A OUTEN 2.5 3.0 3 EL7556B (Continued = Continuous Mode 0 800 1000 2.0 1.5 V =5V DD 1.0 800 1000 2.3 2.1 F =500k 1.9 OSC 1.7 1.5 1.3 1.1 0.9 0.7 4.0 4.5 5.0 I OSC T =25° ...
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... Board with 0.00 1.00 2.00 3.00 Bare Cu Area ( Temperature DSON Temperature (° EL7556B (Continued) Components Board with Inductor 4.00 5.00 6. 100 125 Maximum I vs Temperature LOAD 7556 Demo Board (31°C /W) 8.0 7.5 7.0 100 LFPM 6.5 6.0 5.5 Still Air 5.0 4.5 OUTEN connected to OT 4.0 ...
Page 8
... Connected to voltage doubler output. Supplies gate drive to the low-side driver Drives the negative side of charge pump capacitor at one-half the oscillator frequency F 28 FB2 I Voltage feedback pin. Active when VCC2DET is logic 1. Internally preset EL7556B FUNCTION (Hz) can be approximated by: F OSC = 3.500V. When driven to logic 0 the PWM uses OUT : V = 1.0V*(1+R3/R4). OUT OUT ...
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... R + Applications Information Circuit Description General The EL7556B 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 of the active circuitry required to implement a cost effective, user-programmable 6A synchronous buck converter suitable for use in CPU power supplies. By ...
Page 10
... In the continuous mode of operation the low-side switch will remain on until the end of the oscillator period. In order to improve the low current efficiency of the EL7556B, a zero- crossing comparator senses when the inductor transitions through zero. Turning off the low-side switch at zero inductor ...
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... PCB in order to dissipate heat out and away from the device. The conductive paths for the EL7556B package are the fused leads 10, 11, 12, 18, and 19 sufficient amount of PCB metal area is connected to the fused package leads, a junction-to-ambient thermal resistance of approximately 31° ...