mic4102 Micrel Semiconductor, mic4102 Datasheet
mic4102
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mic4102 Summary of contents
Page 1
... The single input control also reduces system complexity and greatly simplifies the overall design. The MIC4102 also features a low-side drive disable pin. This gives the MIC4102 the capability to operate in a non- synchronous buck mode. This feature allows the MIC4102 to start up into applications where a bias voltage may already be present without pulling the output voltage down ...
Page 2
... HS drive is not affected by the LS signal. Here is the logic table: LS PWM Chip negative supply, generally will be grounded. Low-Side Output. Connect to gate of Low-Side power MOSFET. 2 Package SOIC-8L VSS LS PWM MIC4102 M9999-112806 ...
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... ........................ –40°C to +125°C J )...................................................140°C/W JA < +125°C. J Min Typ Max 150 450 600 3 3.5 4.0 25 150 200 1.5 2 1.5 0.8 1.5 2.2 200 100 500 7.3 6.5 8.0 0.5 7.0 6.0 8.0 0.4 0.4 0.55 0.70 0.7 0.8 1.0 1.0 1.5 2.0 M9999-112806 MIC4102 + 16V HS + 100V DD Units µA mA µA mA µ kΩ Ω ...
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... OHL 12V 160mA -100mA – OHH 12V 1000pF 1000pF 1000pF 0.1µ 0.1µF 4 MIC4102 Min Typ Max Units 0.18 0.3 V 0.4 0.25 0 0.22 0.3 V 0.4 0.25 0 ...
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... Specification for packaged product only. 5. All voltages relative to pin7, V unless otherwise specified Guaranteed by design. Not production tested. November 2006 Condition Note Note Note Note 6 5 MIC4102 Min Typ Max Units M9999-112806 ...
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... Micrel, Inc. Typical Characteristics November 2006 6 MIC4102 M9999-112806 ...
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... Micrel, Inc. Typical Characteristics (cont.) November 2006 7 MIC4102 M9999-112806 ...
Page 8
... LO output will turn off within 36ns ( will remain off. The LS pin LSOFF overrides all shoot through control logic low at the start of the next cycle when PWM signal goes high then HO shall switch transition 1-4 as normal. I.e. PWM signal equals HO output 0V. MIC4102 M9999-112806 ...
Page 9
... The VDD pin voltage is supplied to the HS pin through the internal bootstrap diode. The HB pin voltage will always be a diode drop less than VDD. Input Stage The MIC4102 utilizes a TTL compatible input stage. The November 2006 LEVE L UVLO SHIFT ...
Page 10
... applied to the gate of the B from discharging. B Vin C B Vdd HB C VDD Level HO shift HS Q PWM Vss Figure 4. High-Side Driver and Bootstrap Circuit MIC4102 to charge B is the forward the HS and IN Q1 Lout Vout Cout Q2 M9999-112806 ...
Page 11
... Reverse current flow Diode Reverse Voltage REV = = D Duty Cycle switching frequency of external diode C B Vdd HB Level HO shift Vss Figure 5. Optional Bootstrap Diode MIC4102 RR An external The reverse at V and T REV J the power supply Vin M9999-112806 ...
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... Rg_fet. The power dissipated in the MIC4102 due to driving the external MOSFET is: Pdiss Supply Current Power Dissipation Power is dissipated in the MIC4102 even if is there is nothing being driven. The supply current is drawn by the bias for the internal circuitry, the level shifting circuitry and shoot-through current in the output drivers. ...
Page 13
... The timing diagram helps illustrate how the anti-shoot- through circuitry works. A high level on the PWM pin causes the LO pin to go low. The MIC4102 monitors the LO pin voltage and prevents the HO pin from turning on simple, ...
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... Grounding, Component Placement and Circuit Layout Nanosecond switching speeds and ampere peak currents in and around the MIC4102 driver require proper placement and trace routing of all components. Improper immunity, false switching, excessive ringing or circuit latch-up. ...
Page 15
... Minimizing these parameters decreases the parasitic inductance and the radiated EMI generated by fast rise A typical layout of a synchronous Buck converter power stage using the MIC4102 (Figure 11) is shown in Figure 12. MIC4102 Low-side drive turn-off current path LO LO Vss ...
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... This close placement is necessary to efficiently charge capacitor C when the HS node is low. B traces are 0.025” wide or greater to reduce impedance. Cin is used to decouple the high current path through the MIC4102 and C are VDD All MOSFETs. M9999-112806 ...
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... Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully November 2006 8-Pin SOIC (M) indemnify Micrel for any damages resulting from such use or sale. © 2006 Micrel, Incorporated. 17 MIC4102 nt M9999-112806 ...