MIC2178 2.5A Synchronous Buck Regulator General Description

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MIC2178 2.5A Synchronous Buck Regulator General Description

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MIC2178
MIC2178
2.5A Synchronous Buck Regulator
General Description
Micrel MIC2178 200kHz synchronous buck (stepdown) switching regulator designed high-efficiency, battery-powered applications. MIC2178 operates from 4.5V 16.5V input features internal power MOSFETs that supply 2.5A output current. operate with maximum duty cycle 100% low-dropout conditions. also features shutdown mode that reduces quiescent current less than 5µA. MIC2178 achieves high efficiency over wide output current range operating either skip mode. operating mode externally selected, typically intelligent system, which chooses appropriate mode according operating conditions, efficiency, noise requirements. switching frequency preset 200kHz synchronized external clock signal 300kHz. MIC2178 uses current-mode control with internal current sensing. Current-mode control provides superior line regulation makes regulator control loop easy compensate. output protected with pulse-by-pulse current limiting thermal shutdown. Undervoltage lockout turns output when input voltage less than 4.5V. MIC2178 packaged 20-lead wide power SOIC package with operating temperature range -40°C +85°C.
Features
4.5V 16.5V input voltage range Dual-mode operation high efficiency 96%) mode 200mA load current Skip mode 200mA load current 100m internal power MOSFETs input 200kHz preset switching frequency quiescent current 1.0mA mode 600µA skip mode shutdown mode Current-mode control Simplified loop compensation Superior line regulation 100% duty cycle dropout operation Current limit Thermal shutdown Undervoltage lockout
Applications
High-efficiency, battery-powered supplies Buck (step-down) dc-to-dc converters Palmtop computers Laptop computers Cellular telephones Hand-held instruments Battery Chargers
MIC2177 automatic selection skipmode operation.
Typical Application
5.4V 22µF 22µF
Skip Mode Mode ENABLE
1,2,9
Output Efficiency
33µH MBRS140 220µF
EFFICIENCY
MIC2178-5.0 PWRGD SYNC COMP SGND
14-17
Ouput Good Output
VOUT 5V/2.5A 220µF
SKIP 1000 2500 OUTPUT CURRENT (mA)
PGND BIAS
6.8nF
0.01µF
Micrel, Inc. 1849 Fortune Drive Jose, 95131 (408) 944-0800 (408) 944-0970 http://www.micrel.com
June 2001
MIC2178
MIC2178
Ordering Information
Part Number MIC2178BWM MIC2178-3.3BWM MIC2178-5.0BWM Voltage Adjustable 3.3V 5.0V Temperature Range -40°C +85°C -40°C +85°C -40°C +85°C Package 20-lead Wide SOIC 20-lead Wide SOIC 20-lead Wide SOIC
Configuration
PGND PGND PGND PGND BIAS SYNC SGND SGND SGND SGND COMP PWRGD
20-Lead Wide Power SOIC
Description
Number Name PGND Function Supply Voltage (Input): Requires bypass capacitor PGND. three pins must connected VIN. Switch (Output): Internal power MOSFET output switches. Both pins must externally connected together. Power Ground: Connect pins central ground point. PWM/Skip-Mode Control (Input): Logic-level input. Controls regulator operating mode. Logic enables mode. Logic high enables skip mode. allow float. Error Flag (Output): Open-drain output. Active when input below reference voltage (VREF). Feedback (Input): Connect output voltage divider resistors. Compensation: Output internal error amplifier. Connect capacitor series network compensate regulator control loop. Signal Ground: Connect pins ground, PGND*. Frequency Synchronization (Input): Optional. Connect external clock signal synchronize oscillator. Leading edge signal above 1.7V terminates switching cycle. Connect SGND used. Internal 3.3V Bias Supply: Decouple with 0.01µF bypass capacitor SGND. apply external load. Enable (Input): Logic high enables operation. Logic shuts down regulator. allow float.
PWRGD COMP SGND SYNC
BIAS
MIC2178
June 2001
MIC2178
Absolute Maximum Ratings
Supply Voltage [100ms transient] (VIN) Output Switch Voltage (VSW) Output Switch Current (ISW) 6.0A Enable, Control Voltage (VEN, VPWM) Sync Voltage (VSYNC)
Operating Ratings
Supply Voltage (VIN) 4.5V 16.5V Junction Temperature Range (TJ) -40°C +125°C
Electrical Characteristics
7.0V; 25°C, bold indicates -40°C 85°C; unless noted. Symbol Parameter Input Supply Current Condition mode, output switching, 4.5V 16.5V skip mode, output switching, 4.5V 16.5V 4.5V 16.5V VBIAS VOUT Bias Regulator Output Voltage Feedback Voltage Output Voltage 16.5V MIC2178 [adj.]: VOUT 3.3V, ILOAD MIC2178 [adj.]: VOUT 3.3V, 16V, 10mA ILOAD MIC2178-5.0: ILOAD MIC2178-5.0: 16V, 10mA ILOAD MIC2178-3.3: ILOAD MIC2178-3.3: 16V, 10mA ILOAD AVOL Feedback Bias Current Undervoltage Lockout upper threshold lower threshold MIC2178 [adj.] MIC2178-5.0, MIC2178-3.3 Error Amplifier Gain Error Amplifier Output Swing 0.6V VCOMP 0.8V upper limit lower limit Error Amplifier Output Current DMAX Oscillator Frequency Maximum Duty Cycle Minimum On-Time SYNC Frequency Range SYNC Threshold SYNC Minimum Pulse Width ISYNC ILIM SYNC Leakage Current Limit VSYNC 5.5V mode, skip mode Switch On-Resistance high-side switch, low-side switch, Output Switch Leakage 16.5V 1.0V 1.5V 0.01 source sink 3.90 3.10 1.22 3.20 3.14 4.85 4.85 4.75 3.20 3.20 3.14 3.30 1.245 4.25 4.15 0.05 1.27 3.40 3.46 5.15 5.15 5.25 3.40 3.40 3.46 4.35 Units
June 2001
MIC2178
MIC2178
Symbol Parameter Enable Threshold IPWM Enable Leakage Threshold Leakage PWRGD Threshold VPWM 5.5V MIC2178 [adj.]: measured MIC2178-5.0: measured MIC2178-3.3: measured PWRGD Output PWRGD Leakage ISINK 1.0mA VPWRGD 5.5V 5.5V Condition 1.09 4.33 2.87 0.01 0.01 1.13 4.54 3.00 0.25 0.01 1.17 4.75 3.13
Units
General Note: Devices sensitive. Handling precautions recommended.
MIC2178
June 2001
MIC2178
Typical Characteristics
Oscillator Frequency Temperature
REFERENCE VOLTAGE
FREQUENCY (kHz)
1.252 1.250 1.248 1.246 1.244 1.242 1.240
Reference Voltage Temperature
REFERENCE VOLTAGE MIC2178 [adj.]
3.320 3.315 3.310 3.305 3.300 3.295 3.290 3.285
Reference Voltage Temperature
MIC2178-3.3
TEMPERATURE (°C)
1.238 TEMPERATURE (°C)
3.280 TEMPERATURE (°C)
5.030 REFERENCE VOLTAGE 5.020 5.010 5.000 4.990 4.980
Reference Voltage Temperature
AMPLIFIER VOLTAGE GAIN MIC2178-5.0
19.0 18.5 18.0 17.5 17.0 16.5
Error-Amplifier Gain Temperature
BIAS CURRENT (nA)
Feedback Input Bias Current Temperature
TEMPERATURE (°C)
4.970 TEMPERATURE (°C)
16.0 TEMPERATURE (°C)
CURRENT LIMIT
Current Limit Temperature
ON-RESISTANCE
High-Side Switch On-Resistance
ON-RESISTANCE 125°C 85°C 25°C
Low-Side Switch On-Resistance
125°C 85°C 25°C
TEMPERATURE (°C)
INPUT VOLTAGE
INPUT VOLTAGE
SUPPLY CURRENT (mA)
PWM-Mode Supply Current
OUTPUT SWITCHING
EFFICIENCY
3.3V Output Efficiency
EFFICIENCY
Output Efficiency
SKIP 1000 2500 OUTPUT CURRENT (mA)
INPUT VOLTAGE
SKIP 1000 2500 OUTPUT CURRENT (mA)
June 2001
MIC2178
MIC2178
Block Diagram
4.5V 16.5V
100µF
UVLO, Thermal Shutdown Output Control Logic ISENSE Amp.
100m P-channel
VOUT
1.245
VOUT
Enable Shutdown
3.3V Regulator
BIAS
COUT
0.01µF internal supply Voltage
100m N-channel ILIMIT Comp. ILIMIT Thresh. Voltage Corrective Ramp
PGND
Connect SGND PGND
Skip Mode Mode
PWM/ Skip-Mode Select
Bold lines indicate high current traces
Stop
SYNC
200kHz Oscillator Reset Pulse Power Good Comp. PWRGD
Skip-Mode Comp.
Comp. MIC2178 [Adjustable] SGND
Output Good
COMP
VREF 1.245V
1.13V
MIC2178
June 2001
MIC2178
connect external load BIAS pin. designed provide external supply voltage. Frequency Synchronization MIC2178 operates preset switching frequency 200kHz. synchronized higher frequency connecting external clock SYNC pin. SYNC logic level input that synchronizes oscillator rising edge external clock signal. frequency range 220kHz-300kHz, operate with minimum pulse width 500ns. synchronization required, connect SYNC ground. Power Good Flag power good flag (PWRGD) error flag that alerts system when output regulation. When output voltage below nominal value, PWRGD logic low, signaling that VOUT low. PWRGD open-drain output that sink from pull-up resistor connected VIN. Low-Dropout Operation Output regulation maintained skip mode even when difference between VOUT decreases below VOUT decreases, duty cycle increases until reaches 100%. this point, P-channel kept several cycles time, output stays regulation until VOUT falls below dropout voltage (dropout voltage P-channel on-resistance load current). PWM-Mode Operation Refer "PWM Mode Functional Diagram" which simplified block diagram MIC2178 operating mode associated waveforms. When operating mode, output P-channel Nchannel MOSFETs alternately switched constant frequency variable duty cycle. switching period begins when oscillator generates reset pulse. This pulse resets latch which turns P-channel turns N-channel. During this time, inductor current (IL1) increases energy stored inductor. current sense amplifier (ISENSE Amp) measures P-channel drain-tosource voltage outputs voltage proportional IL1. output ISENSE added sawtooth waveform (corrective ramp) generated oscillator, creating composite waveform labeled ISENSE timing diagram. When ISENSE greater than error amplifier output, comparator will latch which turns Pchannel turns N-channel. Energy then discharged from inductor decreases until next switching cycle begins. varying P-channel on-time (duty cycle), average inductor current adjusted whatever value required regulate output voltage. MIC2178 uses current-mode control adjust duty cycle regulate output voltage. Current-mode control signal loops that determine duty cycle. outer loop that senses output voltage, other faster inner loop that senses inductor current. Signals from these loops control duty cycle following way: VOUT back error amplifier which compares feedback voltage (VFB) internal reference voltage
Functional Description
Micrel's MIC2178 synchronous buck regulator that operates from input voltage 4.5V 16.5V provides regulated output voltage 1.25V 16.5V. internal power MOSFETs that supply 2.5A load current operates with 100% duty cycle allow low-dropout operation. optimize efficiency, MIC2178 operates skip mode. Skip mode provides best efficiency when load current less than 200mA, while mode more efficient higher current. skip-mode operation selected externally, allowing intelligent system (i.e. microprocessor controlled) select correct operating mode efficiency noise requirements. During operation, MIC2178 uses current-mode control which provides superior line regulation makes control loop easier compensate. switching frequency internally 200kHz synchronized external clock frequency 300kHz. Other features include low-current shutdown mode, current limit, undervoltage lockout, thermal shutdown. following sections more detail. Switch Output switch output (SW) half H-bridge consisting highside P-channel low-side N-channel power MOSFET. These MOSFETs have typical on-resistance 100m when MIC2178 operates from supply. Antishootthrough circuitry prevents P-channel N-channel from turning same time. Current Limit MIC2178 uses pulse-by-pulse current limiting protect output. During each switching period, current limit comparator detects P-Channel current exceeds 4.7A. When does, P-channel turned until next switching period begins. Undervoltage Lockout Undervoltage lockout (UVLO) turns output when input voltage (VIN) provide sufficient gate drive output MOSFETs. prevents output from turning until exceeds 4.3V. Once operating, output will shut until drops below 4.2V. Thermal Shutdown Thermal shutdown turns output when MIC2178 junction temperature exceeds maximum value safe operation. After thermal shutdown occurs, output will turn until junction temperature drops approximately 10°C. Shutdown Mode MIC2178 low-current shutdown mode that controlled enable input (EN). When logic applied MIC2178 shutdown mode, quiescent current drops less than 5µA. Internal Bias Regulator internal 3.3V regulator provides power MIC2178 control circuits. This internal supply brought BIAS bypassing external 0.01µF capacitor.
June 2001
MIC2178
MIC2178 (VREF). When VOUT lower than nominal value, error amplifier output voltage increases. This voltage then intersects current sense waveform later switching period which increases duty cycle average inductor current VOUT higher than nominal, error amplifier output voltage decreases, reducing duty cycle. control loop stabilized ways. First, inner signal loop compensated adding corrective ramp output current sense amplifier. This allows regulator remain stable when operating greater than duty cycle. Second, series resistor-capacitor load connected error amplifier output (COMP pin). This places pole-zero pair regulator control loop. more important item synchronous rectification. mentioned earlier, N-channel output MOSFET turned after P-channel turns off. When N-channel turns on-resistance enough create short across output diode. result, inductor current flows through N-channel voltage drop across significantly lower than diode forward voltage. This reduces power dissipation improves efficiency greater than under certain operating conditions. prevent shoot through current, output stage employs break-before-make circuitry that provides approximately 50ns delay from time MOSFET turns other turns result, inductor current briefly flows through output diode during this transition. Skip-Mode Operation Refer "Skip Mode Functional Diagram" which simplified block diagram MIC2178 operating skip mode associated waveforms. Skip-mode operation turns output P-channel frequency duty cycle that function VIN, VOUT, output inductor value. While skip mode, N-channel kept optimize efficiency reducing gate charge dissipation. VOUT regulated skipping switching cycles that turn P-channel. begin analyzing MIC2178 skip mode operation, assume skip-mode comparator output high latch output been reset logic This turns P-channel causes increase linearly until reaches current limit 600mA. When reaches this value, current limit comparator sets latch output logic turning
P-channel. output switch voltage (VSW) then swings from 0.4V below ground, flows through Schottky diode. discharges energy output decreases zero. When swings from -0.4V VOUT, this triggers one-shot that resets latch. Resetting latch turns P-channel, this begins another switching cycle. skip-mode comparator regulates VOUT controlling when MIC2178 skips cycles. compares VREF 10mV hysteresis prevent oscillations control loop. When less than VREF -5mV, comparator output logic allowing P-channel turn Conversely, when greater than VREF 5mV, P-channel turned off. Note that this self oscillating topology which explains switching frequency duty cycle function VIN, VOUT, value unique feature (for pulse-skipping regulator) supplying same value maximum load current value VIN, VOUT, This allows MIC2178 always supply 300mA load current when operating skip mode. Selecting PWM- Skip-Mode Operation skip mode operation selected external logic signal applied pin. logic places MIC2178 into mode, logic high places into skip mode. Skip mode operation provides best efficiency when load current less than 200mA, operation more efficient higher currents. MIC2178 designed used intelligent systems that determine when should operate skip mode. This makes MIC2178 ideal applications where regulator must guarantee noise operation when supplying light load currents, such cellular telephone, audio, multimedia circuits. There important items aware when selecting skip mode. First, MIC2178 start-up only mode, therefore requires logic during start-up. Second, skip mode, MIC2178 will supply maximum load current approximately 300mA, output will drop regulation when load current exceeds this limit. prevent this from occurring, MIC2178 should change from skip mode when load current exceeds 200mA.
MIC2178
June 2001
MIC2178
PWM-Mode Functional Diagram
4.5V 16.5V
100m P-channel ISENSE Amp.
VOUT
1.245
COUT
VOUT
100m N-channel
PGND
Corrective Ramp
Stop
SYNC
200kHz Oscillator Reset Pulse
COMP
Comp.
Error Amp.
VREF 1.245V MIC2178 [Adjustable] PWM-Mode Signal Path SGND
Reset Pulse
ILOAD
Error Amp. Output ISENSE
June 2001
MIC2178
MIC2178
Skip-Mode Functional Diagram
4.5V 16.5V
Output Control Logic Shot ISENSE Amp. 100m P-channel
VOUT
1.245
COUT
VOUT
PGND
ILIMIT Comp. ILIMIT Thresh. Voltage
Skip-Mode Comp.
VREF 1.245V MIC2178 [Adjustable] Skip-Mode Signal Path SGND
VOUT
One-Shot Pulse
ILIM VREF VREF
MIC2178
June 2001
MIC2178
maximize efficiency, inductor's resistance must less than output switch on-resistance (preferably, less). Output Capacitor Selection Select output capacitor that value ESR. This parameter determines regulator's output ripple voltage (VRIPPLE) which generated ESR. Therefore, must equal less than maximum value calculated specified VRIPPLE (typically less than output voltage) IL(max): ESRMAX VRIPPLE IL(max)
Application Information
Feedback Resistor Selection (Adjustable Version) output voltage programmed connecting external resistive divider shown "MIC2178 Block Diagram." ratio determines output voltage. optimize efficiency during output current operation, should less than 20k. However, prevent feedback error input bias current pin, should greater than 100k. After selecting calculate with following formula:
1.245V
Input Capacitor Selection input capacitor selected current voltage rating should (equivalent series resistance) electrolytic tantalum capacitor. rule thumb, voltage rating tantalum capacitor should twice value VIN, voltage rating electrolytic should higher than VIN. current rating must equal greater than maximum input ripple current. simple, worst case formula calculating this current IRMS(max) ILOAD(max)
Tantalum capacitors better choice applications that require most compact layout operation below 0°C. input capacitor must located very close (within 0.2in, 5mm). Also, place 0.1µF ceramic bypass capacitor close possible VIN. Inductor Selection MIC2178 current-mode controller with internal slope compensation. result, inductor must least minimum value prevent subharmonic oscillations. This minimum value calculated following formula:
LMIN VOUT 3.0µH/V
general, value least greater than LMIN should selected because inductor values have tolerance ±20%. other parameters consider selecting inductor winding resistance peak current rating. inductor must have peak current rating equal greater than peak inductor current. Otherwise, inductor saturate, causing excessive current output switch. Also, inductor's core loss increase significantly. Both these effects will degrade efficiency. formula peak inductor current IL(peak) ILOAD(max) Where: IL(max)
VOUT IL(max) VOUT VIN(max)
Typically, capacitors range 220µF have less than this maximum value. output capacitor electrolytic tantalum capacitor, tantalum better choice compact layout operation temperatures below 0°C. voltage rating tantalum capacitor must VOUT, voltage rating electrolytic must VOUT. Output Diode Selection operation, inductor current flows through output diode approximately 50ns during dead time when output MOSFET turns other turns skip mode, inductor current flows through diode during entire Pchannel time. correct diode both these conditions diode with reverse voltage rating greater than VIN. must Schottky ultrafast-recovery diode 100ns) minimize power dissipation from diode's reverse-recovery charge. Compensation Compensation provided connecting series load COMP pin. This creates pole-zero pair regulator control loop, allowing regulator remain stable with enough frequency loop-gain good load line regulation. higher frequencies, pole-zero reduces loop-gain level referred mid-band gain. midband gain enough that loop gain crosses with sufficient phase margin. Typical values load 4.7nF 10nF capacitor resistor. Printed Circuit Board Layout well designed board will prevent switching noise ground bounce from interfering with operation MIC2178. good design takes into consideration component placement routing power traces. first thing consider locations input capacitor, inductor, output diode, output capacitor. input capacitor must placed very close pin, inductor output diode very close pin, output capacitor near inductor. These components pass large high-frequency current pulses, they must short, wide power traces. addition, their ground pins PGND connected ground plane that nearest power supply ground bus.
June 2001
MIC2178
MIC2178 feedback resistors, compensation network, BIAS bypass capacitor should located close their respective pins. prevent ground bounce, their ground traces SGND should path switching
currents returning power supply ground bus. SGND PGND should tied together ground plane that extends under MIC2178.
4.5V 16.5V 22µF
1,2,9
PWRGD MIC2178 PGND SYNC COMP SGND
14-17
50µH MBRS130L
Skip Mode Mode
VOUT 3.3V/1A 100µF MIC2178-3.3BWM TPSE226M035R0300, TPSD107M010R0100, Ceramic Dielectric Material Ceramic Dielectric Material MBRS130LT3 CTX50-4P, 0.097 DO3316P-473, 0.12 HM77-11003, 0.073
BIAS
6.8nF
0.01µF
Micrel Z5UorX7R X7RorNP0 Motorola Coiltronics Coilcraft
Figure MIC2178 4.5V-16.5V 3.3V/1A Regulator
5.4V 16.5V 22µF
1,2,9
50µH MBRS130L
Skip Mode Mode
PWRGD MIC2178 PGND SYNC COMP SGND
14-17
VOUT 5V/1A 100µF Micrel Z5UorX7R X7RorNP0 Motorola Coiltronics Coilcraft MIC2178-5.0BWM TPSE226M035R0300, TPSD107M010R0100, Ceramic Dielectric Material Ceramic Dielectric Material MBRS130LT3 CTX50-4P, 0.097 DO3316P-473, 0.12 HM77-11003, 0.073
BIAS
6.8nF
0.01µF
Figure MIC2178 5.4V-16.5V 5V/1A Regulator
MIC2178
June 2001
MIC2178
12.5V 16.5V 22µF
1,2,9
PWRGD MIC2178 PGND SYNC COMP SGND
14-17
68µH MBRS130L 174k
Skip Mode Mode
68µF
VOUT 12V/1A
BIAS
6.8nF
0.01µF
Micrel MIC2178BWM TPSE226M035R0300, TPSE686M020R0150, 0.15 Z5UorX7R Ceramic Dielectric Material X7RorNP0 Ceramic Dielectric Material Motorola MBRS130LT3 Coiltronics CTX68-4P, 0.238 Coilcraft DO3316P-683, 0.016 HM77-11003, 0.233
Figure MIC2178 12.5V-16.5V 12V/1A Regulator
16.5V 22µF
1,2,9
PWRGD MIC2178 PGND SYNC COMP SGND
14-17
33µH MBRS130L
Skip Mode Mode
BIAS
220µF Micrel Z5UorX7R X7RorNP0 Motorola
VOUT 3.3V/2.5A
6.8nF
0.01µF
MIC2178-3.3BWM TPSE226M035R0300, TPSE227M010R0100, Ceramic Dielectric Material Ceramic Dielectric Material MBRS130LT3 HM77-18004, 0.075
Figure MIC2178 10V-16.5V 3.3V/2.5A Regulator
4.5V 22µF
1,2,9
PWRGD MIC2178 PGND SYNC COMP SGND
14-17
33µH MBRS130L
Skip Mode Mode
100µF Micrel Z5UorX7R X7RorNP0 Motorola Coiltronics Coilcraft
VOUT 3.3V/1A
BIAS
6.8nF
0.01µF
MIC2178-3.3BWM TPSE226M035R0300, TPSD107M010R0100, Ceramic Dielectric Material Ceramic Dielectric Material MBRS130LT3 CTX33-3P, 0.077 DO3316-333, 0.088 HM77-60002, 0.035
Figure MIC2178 4.5V-10V 3.3V/1A Regulator
June 2001
MIC2178
MIC2178
SI9435
4.5V 16.5V
22µF
1,2,9
50µH MBRS130L
Skip Mode Mode
PWRGD MIC2178 PGND SYNC COMP SGND
14-17
100µF Micrel Z5UorX7R X7RorNP0 Motorola Siliconix Coiltronics Coilcraft
VOUT 3.3V/1A
BIAS
6.8nF
0.01µF
0.01µF
MIC2178-3.3BWM TPSE226M035R0300, TPSD107M010R0100, Ceramic Dielectric Material Ceramic Dielectric Material MBRS130LT3 Si9435DY PMOS CTX50-4P, 0.097 DO3316-473, 0.12 HM77-11003, 0.073
Figure MIC2178 Reversed Battery Protected Regulator
16.5V 22µF
1,2,9
50µH MBRS130L
Skip Mode Mode
PWRGD MIC2178 PGND SYNC COMP SGND
14-17
+VOUT/+IOUT 5V/0.5A 100µF
BIAS
6.8nF 0.01µF
100µF
MBRS130L
100µF -VOUT/-IOUT -5V/0.5A
Micrel Z5UorX7R X7RorNP0 Motorola Motorola Coiltronics
MIC2178-5.0BWM TPSE226M035R0300, TPSD107M010R0100, TPSD107M010R0100, TPSD107M010R0100, Ceramic Dielectric Material Ceramic Dielectric Material MBRS130LT3 MBRS130LT3 CTX50-4P, 0.097
+IOUT (-IOUT VOUT then IOUT then IOUT
IOUT IOUT
Figure MIC2178 8V-16.5V ±5V/500mA Regulator
MIC2178
June 2001
MIC2178
Suggested Manufacturers List
Inductors Capacitors Diodes Transistors
Coilcraft 1102 Silver Lake Cary, 60013 tel: (708) 639-2361 fax: (708) 639-1469 Coiltronics 6000 Park Commerce Blvd. Boca Raton, 33487 tel: (407) 241-7876 fax: (407) 241-9339 Technologies 4200 Bonita Place Fullerton, tel: (714) 447-2345 fax: (714) 447-2500
Corp. 17th Ave. South Myrtle Beach, 29577 tel: (803) 448-9411 fax: (803) 448-1943 Sanyo Video Components Corp. 2001 Sanyo Ave. Diego, 92173 tel: (619) 661-6835 fax: (619) 661-1055 Sprague Electric Lower Main 60005 Sanford, 04073 tel: (207) 324-4140
General Instruments (GI) Melville Park Melville, 11747 tel: (516) 847-3222 fax: (516) 847-3150 International Rectifier Corp. Kansas Segundo, 90245 tel: (310) 322-3331 fax: (310) 322-3332 Motorola Inc. 56-126 3102 North 56th Phoenix, 85018 tel: (602) 244-3576 fax: (602) 244-4015
Siliconix 2201 Laurelwood Santa Clara, 96056 tel: (800) 554-5565
June 2001
MIC2178
MIC2178
Package Information
0.301 (7.645) 0.297 (7.544)
DIMENSIONS: INCHES (MM)
0.027 (0.686) 0.031 (0.787)
0.050 (1.270)
0.016 (0.046)
0.094 (2.388) 0.090 (2.286)
0.509 (12.929) 0.505 (12.827)
0.015 (0.381) 0.015 (0.381) SEATING PLANE
0.103 (2.616) 0.099 (2.515)
0.297 (7.544) 0.293 (7.442)
0.022 (0.559) 0.018 (0.457)
0.330 (8.382) 0.326 (8.280) 0.032 (0.813) 0.408 (10.363) 0.404 (10.262)
20-Lead Wide (WM)
MICREL INC.
1849 FORTUNE DRIVE JOSE, 95131
(408) 944-0800
(408) 944-0970
http://www.micrel.com
This information believed accurate reliable, however responsibility assumed Micrel infringement patents other rights third parties resulting from use. license granted implication otherwise under patent patent right Micrel Inc. 2001 Micrel Incorporated
MIC2178
June 2001

MIC2178 2.5A Synchronous Buck Regulator General Description

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