MIC9130 Micrel, Inc. MIC9130 High-Voltage, High-Speed Telecom DC-to-DC Controller General Description Features The MIC9130 is a current-mode PWM controller that ef ciently Input voltages up to 180V converts 48V telecom voltages to logic levels. The MIC9130 Internal oscillator capable of >2.5MHz operation features a high voltage start-up circuit that allows the device to Synchronisation capability to 4MHz be connected to input voltages as high as 180V. The high input Current sense delay of 34ns voltage capability protects the MIC9130 from line transients Minimum pulse width <25ns that are common in telecom systems. The start-up circuitry 90% ef ciency also saves valuable board space and simpli es designs by 1.3mA quiescent current integrating several external components. 1 A shutdown current Soft-start The MIC9130 is capable of high speed operation. Typically Resistor programmable current sense threshold the MIC9130 can control a sub-25ns pulse width on the gate Selectable soft-start retry out pin. Its internal oscillator can operate over 2.5MHz, with 4 sink, 12 source output driver even higher frequencies available through synchronisation. Programmable under-voltage lockout The high speed operation of the MIC9130 is made safe by Constant-frequency PWM current-mode control the very fast, 34ns response from current sense to output, 16-pin SOIC and 16-pin QSOP minimizing power dissipation in a fault condition. The MIC9130 allows for the designs of high ef ciency power supplies. It can achieve ef ciencies over 90% at high output Applications currents. Its low 1.3mA quiescent current allows high ef ciency Telecom power supplies even at light loads. Line cards The MIC9130 has a maximum duty cycle of 50%. For de- ISDN network terminators signs requiring a high duty cycle, refer to the MIC9131. The Micro- and pico-cell base stations MIC9130 is available in a 16-pin SOP and 16-pin QSOP Low power (< 30W) dc-dc converters package options. The rated junction temperature range is from 40C to +125C. Typical Application MBR0540 40V/0.5A 20 12V N = 5 T1 1 F 16V VIN VOUT 2.5 H 36V to 72V 3.3V 4A 0.1 F N = 20 N = 4 1M Si4800DY 330 F (x2) B330 6.3V 38.3k 13 1 2 10 Si4884DY 20k 7 FB 6 COMP FQD10N20 1.21k 5 16 0.2 SYNC OUT 200V 8 MIC9130 CPWR Slope 3 Compensation RBIAS 332k 12 SS 14 ISNS 9 332k VBIAS 0.2 0.1 F 1W OSC AGND PGND 4 11 15 4.75k 10nF 47pF OPTO FEEDBACK 1.5MHz DSL Power Supply Micrel, Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 MIC9130 Micrel, Inc. Ordering Information Part Number Max. Duty Cycle Junction Temp. Range Package Standard Pb-Free MIC9130BM MIC9130YM 50% -40C to +125C 16-Pin SOP MIC9130BQS MIC9130YQS 50% -40C to +125C 16-Pin QSOP Pin Con guration LINE 1 16 OUT 15 VCC 2 PGND 14 RBIAS 3 ISNS OSC 4 13 UVLO 12 SYNC 5 SS COMP 6 11 AGND 10 FB 7 EN CPWR 9 VBIAS 8 16-Pin SOP (M) 16-Pin QSOP (QS) Pin Description Pin Number Pin Name Pin Function 1 LINE Line (Input): 180Vdc maximum supply input. May be oated if unused. 2 VCC Supply (Input): MIC9130 internal supply input. 3 RBIAS Bias Resistor (External Component): Connect 562K to ground. 4 OSC Oscillator RC Network (External Components): Connect external resistor- capacitor network to set oscillator frequency. 5 SYNC Synchronization (Input): External oscillator input for slave operation of controller. See OSC. Do not oat. 6 COMP Compensation (External Components): Error ampli er output for external compensation network connection. 7 FB Feedback (Input): Error ampli er inverting input. 8 CPWR Current Limit Selection (Input): When CPWR is high, an over-current condition at the ISNS input will terminate the gate drive and reset the soft-start latch. If the CPWR pin is low, an over-current condition at the ISNS input will terminate the gate drive signal, but will not cause a reset of the soft-start circuit. 9 VBIAS Reference (Output): Internal 5V supply. Will source 5mA maximum. 10 EN Enable (Input): Logic level enable/shutdown input logic high = enabled (on), logic low = shutdown (off). 11 AGND Analog Ground (Return) 12 SS Soft-Start (External Components): Connect external capacitor to slowly ramp up duty cycle during startup and over-current conditions. 13 UVLO Undervoltage Lockout (External Components): Connect to unbiased resistive divider network to set controllers minimum operating voltage. Connect to VBIAS if not needed. 14 ISNS Current Sense (Input): Connect between external switching MOSFET source and switch current sense resistor. 15 PGND Power Ground (Return) 16 OUT Switch Drive Output (Output): Connect to gate of external switching MOSFET. M9999-111108 2 November 2008