SC2608A Simple, Synchronous Voltage Mode PWM Controller POWER MANAGEMENT Description Features SC2608A features include temperature compensated voltage reference, triangle wave oscillator, current limit comparator, and an externally compensated error ampli- The SC2608A is a versatile voltage-mode PWM controller designed for use in step down DC/DC power supply applications. A simple, fixed frequency, highly efficient buck regulator can be implemented using the SC2608A with minimal external components. The input voltage range is from +5V to +12V. Internal level shift and drive circuitry eliminates the need for an expensive P-channel, high-side MOSFET. The small device footprint allows for compact circuit design. fier. Current limit is implemented by sensing the voltage drop across the bottom MOSFET RDS(ON). +5V or +12V input voltage 250kHz operation High efficiency (>90%) 1.5% Reference voltage accuracy Hiccup mode over current protection Robust output drive RDS(ON) Current sensing for protection Industrial temperature range SO-8 package Integrated boot strap diode Thermal Shut down Fully WEEE and RoHS Compliant Applications The SC2608A operates at a fixed frequency of 250kHz providing an optimum compromise between efficiency , external component size, and cost. SC2608A has a thermal protection circuit, which is activated if the junction temperature exceeds 150 OC. Termination supplies Low cost microprocessor supplies Peripheral card supplies Industrial power supplies High density DC/DC conversion Typical Application Circuit SC2608A SC2608 sense COMP/SS SENSE +12V/+5V/+3.3V +12V GND VCC DL PHASE DH BST VOUT sense Figure 1 Revision 2: April, 2006 1 www.semtech.com SC2608A POWER MANAGEMENT Absolute Maximum Ratings Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied. P ar am e t e r S y m b ol M ax i m u m Un i ts VCC to GND +20 V BST to PHASE +15 V BST to GND +35 V -1 to +24 V +15 V -1 to +15 V COMP/SS to GND +7 V SENSE to GND +7 V PHASE to GND (note1) DH to PHASE (note1) DL to GND (note2) Thermal Resistance Junction to Case qJC 40 O Thermal Resistance Junction to Ambient qJA 120 O Op erating Temp erature Range TJ -40 to +125 O Storage Temp erature Range TSTG -65 to +150 O ESD Rating (Human Body Model) ESD 2 C/W C/W C C kV Note 1: Under pulsing condition, the peak negative voltage can not be lower than -3.6V with less than 20nS from 50% to 50%. Note 2: Under pulsing condition, the peak negative voltage can not be lower than -5V with less than 20nS from 50% to 50%. Electrical Characteristics Unless specified: VCC = 12V, VBST - VPhase = 12 V, VOUT = 3.3V, TJ = TA = 25oC. P a r a m et er Sym b ol C on d i t i on s Mi n Typ Ma x Un i ts 14 V P ow er Su p p l y Supply Voltage VCC Supply Current ICC VCOMP < 0.4V V FB 4.75V<Vcc<12.6V 0OC < TA < 85 OC 4.5 6 mA E r r or A m p l i f i er Feedback Voltage -40 OC < TA < 125 OC 0.788 0 .8 0.812 V 0.8 V E/A Transconductance Gm 7 mS Open Loop DC Gain AO 60 dB Input Bias Current IFB 1 Output Sink Current ISINK VSENSE > 0.9V; VCOMP = 2.1V -700 uA Output Source Current ISOURCE VSENSE < 0.7V; VCOMP = 2.1V 120 uA © 2006 Semtech Corp. 2 3 uA www.semtech.com SC2608A POWER MANAGEMENT Electrical Characteristics Unless specified: VCC = 12V, VBST - VPhase = 12 V, VOUT = 3.3V, TJ = TA = 25oC. P ar am e t e r S y m b ol Con d i t i on s Mi n Ty p M ax Un i ts Switching Frequency FOSC Vcc =12V 225 250 275 kHz Ramp Peak Voltage V P -K 4.75V < VCC < 12.6V 1.8 V Ramp Valley Voltage VV 4.75V < VCC < 12.6V 0.8 V Maximum Duty Cycle DMAX 250kHz 85 % DH Sink/Source Current IDH tPW > 400nS VGS = 4.5V (src) 0.6 0.8 A DL Sink/Source Current IDL VGS = 2.5V (snk) 0.6 0.7 DH Rise/Fall Time tr, tf CL = 3000p F, See Fig. 2 50 ns DL Rise/Fall Time tr, tf CL = 4000p F, See Fig. 2 50 ns Dead Time td t See Fig. 2 80 ns DL Minimum On Time tON 4.75V < Vcc < 12.6V 400 ns V T R IP 4.75V < Vcc < 12.6V Vtrip = VPHASE - GND SS Source Current ISRC VCOMP < 2.5V 6 uA SS Sink Current ISNK VCOMP > 0.5V -6 uA V th -40< TJ < 85OC O s ci l l at o r M O S F E T Dri v ers A Cu rren t L i m i t Trip Voltage -400 -350 -300 mV S o f t - S t ar t U n d e r v o l t ag e L o ck o u t UVLO Threshold 3.9 4.1 4.3 V T h e r m al S h u t d o w n Over Temp erature Trip Point © 2006 Semtech Corp. TOTP 150 3 C o www.semtech.com SC2608A POWER MANAGEMENT Gate Drive Timing Diagram Figure 2 Block Diagram BST VCC LEVEL SHIFT OSC DH S REF 0.8V PHASE + R E/A NON-OVERLAP TIMING Q - 0 + PWM SENSE - VCC Vcc OCP & UVLO DL GND OCP 0 PHASE 0 + - 0 COMP/SS Figure 3 © 2006 Semtech Corp. 4 www.semtech.com SC2608A POWER MANAGEMENT Pin Configuration Ordering information Top View Device (1 ) Package Temp Range (TJ) SO-8 -40 to 125OC SC2608ASTRT(2) BST 1 8 DH 2 7 COMP/SS GND 3 6 SENSE DL 4 5 VCC PHASE SC2608AEVB Evaluation Board Notes: (1) Only available in tape and reel packaging. A reel contains 2500 devices. (2) This device is fully WEEE and RoHS Compliant (8-Pin SO-8) Pin Descriptions Pin # P i n N am e 1 BST Bootstrap for high side driver. 2 DH High side driver outp ut. 3 GN D 4 DL Low side driver outp ut. 5 VCC Chip bias sup p ly p in. 6 Sense 7 COMP/SS 8 PHASE © 2006 Semtech Corp. P i n Fu n c t i o n Ground. Outp ut voltage sense inp ut. Error amp lifier outp ut. Connect comp ensation network to GN D. The comp ensation cap acitor serves as soft star t cap acitor. By p ulling this p in low will disable the outp ut. Connect this p in to the switching node between the MOSFETs. 5 www.semtech.com SC2608A POWER MANAGEMENT Theory of Operation Synchronous Buck Converter The output voltage of the synchronous converter is set and controlled by the output of the error amplifier. The inverting input of the error amplifier receives its voltage from the SENSE pin. The non-inverting input of the error amplifier is connected to an internal 0.8V reference. The error amplifier output is connected to the compensation pin. The error amplifier generates a current proportional to (0.8V-Vsense), which is the COMP pin output current (Transconductance ~ 7mS). The voltage on the COMP pin is the integral of the error amplifier current. The COMP voltage is the non-inverting input of the PWM comparator and controls the duty cycle of the MOSFET drivers. The compensation network controls the stability and transient response of the regulator. The larger capacitor, the slower COMP voltage changes, and slower the duty cycle changes. The non-inverting input voltage of the PWM comparator is the triangular ramp signal generated from the oscillator. The peak-to-peak voltage of the ramp is 1V, this is a parameter used in control loop calculation. When the oscillator ramp signal rises above the COMP voltage, the comparator output goes high and the PWM latch is reset. This pulls DH low, turning off the high-side MOSFET. After a short delay (dead time), DL is pulled high, turning on the low-side MOSFET. The oscillator also produces a set pulse for the PWM latch to turn off the low-side MOSFET, After a delay time, DH is pulled high to turn on the highside MOSFET. The delay time is determined by a monostable on the chip. The triangle wave minimum is about 0.8V, and the maximum is about 1.8V. Thus, if Vcomp = 0.7V, high side duty cycle is the minimum (~0%) , but if Vcomp is 1.8V, duty cycle is at maximum ( ~90%).The internal oscillator uses an on-chip capacitor and trimmed precision current sources to set the oscillation frequency to 250kHz. Figure 1 shows a 2.5V output converter. If the Vout <2.5V, then the SENSE voltage < 0.8V. In this case the error amplifier will be sourcing current into the COMP pin so that COMP voltage and duty cycle will gradually increase.If Vout > 2.5V, the error amplifier will sink current and reduce the COMP voltage, so that duty cycle will decrease.The circuit will be in steady state when Vout =2.5V , Vsense = 0.8V, Icomp = 0. The COMP voltage and duty cycle depend on Vin. outputs remain in the off state whenever the supply voltage drops below the set threshold. Lockout occurs if VCC falls below 4.1V typ. Soft Start The SC2608A provides a soft start function to prevent large inrush currents upon power-up or hiccup retry. If both COMP and SENSE pins are low (<300mV), the device enters soft start mode, and the compensation capacitor is slowly charged by an internal 6uA current source. When the COMP pin reaches 300mV, the low side FET is switched on in order to refresh the bootstrap capacitor, and begin PWM from a known state. As the COMP pin rises above 800mV, PWM begins at minimum duty cycle. COMP continues to charge, slowly sweeping the device through the duty cycle range until FB reaches the regulation point of 800mV. Once FB reaches the regulation point, the soft start current is switched off, and the strong error amp is enabled, providing a glitch-free entrance into closed loop operation. The overcurrent comparator is still active during soft start mode, and will override soft start in the event that an overcurrent is detected, such as startup into a dead short. R DS(ON) Current Limiting In case of a short circuit or overload, the low-side (LS) FET will conduct large currents. To protect the regulator in this situation, the controller will shut down the regulator and begin a soft start cycle later. While the LS driver is on,the Phase voltage is compared to the OCP trip voltage. If the phase voltage is lower than OCP trip voltage, an over current condition is detected. The low-side Rdson sense is implemented at end of each LS-FET turn-on duration. The minimum turn-on time of the LS-FET is set to be 400nS. This will ensure the sampled signal is noise free by giving enough time for the switching noise to die down. OCP Hiccup In the event that an overcurrent is detected, the SC2608A latches the fault and begins a hiccup cycle. Switching is immediately stopped, and the drivers are set to a tristate condition (Both DH and DL are low). COMP is slowly discharged to 300mV with an internal 6uA current source, providing a long cooldown time to keep power dissipation low in the event of a continuous dead short. Once COMP and SENSE both fall below the 300mV threshold, the part U nder V oltage Lock out Voltage Lockout re-enables the 6uA soft start current , and the device begins The under voltage lockout circuit of the SC2608A as- a normal startup cycle again. sures that both high-side and low-side MOSFET driver © 2006 Semtech Corp. 6 www.semtech.com SC2608A POWER MANAGEMENT Applications Information (Cont.) G pwm = A note to the user is needed: The device cannot restart until both COMP and SENSE are low, to prevent start up into a charged output. In the event of an overcurrent condition, the output is quickly discharged by the load, therefore bringing SENSE below the 300mV threshold. If the COMP pin is pulled low by an external device (such as an open-drain logic gate used for system shutdown), and SENSE is high(above 300mV) while COMP is low, then the SC2608A turns on the low side FET to discharge the output before changing to shutdown or soft-start mode. The low side FET turns off when SENSE drops below 300mV and the converter remains in the tri-state condition until COMP is released. Although this shutdown technique can be used successfully on the SC2608A, the system designer using COMP for external shutdown will need to consider the load on the low side FET when discharging the output capacitor bank. For large capacitor bank, this peak current can be quite large as it is limited only by the RDS(ON) of the low side FET. Fortunately the duration of this event is quite short, and has been shown in the lab to have no detrimental effect on the performance of the external FETs. Disabling the output by pulling down COMP/SS pin is only recommended when the output capacitor bank is not too large. VBG G_PWM L R Rc 0.8V Ci VIN C Co ⎛V ⎞ 1 + sRcCo T (s ) = Gm • G pwm • Vin • ⎜⎜ bg ⎟⎟ • H c (s ) • ⎛ ⎛ R ⎞ L⎞ ⎝ Vo ⎠ 1 + s⎜⎜ RcCo + ⎟⎟ + s 2 LCo ⎜⎜1 + c ⎟⎟ R o ⎠ ⎝ ⎝ Ro ⎠ H c (s ) = Fo = + sC i 2π 1 LC o (2) Calculate the ESR zero frequency of the output filter capacitor: Fesr = 1 2π R c C o (3) Check that the ESR zero frequency is not too high. F esr < F SW 5 If this condition is not met, the compensation structure may not provide loop stability. The solution is to add some electrolytic capacitors to the output capacitor bank to correct the output filter corner frequency and the ESR zero frequency. In some cases, the filter inductance may also need to be adjusted to shift the filter corner frequency. It is not recommended to use only high frequency multi-layer ceramic capacitors for output filter. (4) Choose the loop gain cross over frequency (0 dB frequency). It is recommended that the crossover frequency is always less than one fifth of the switching frequency : 1 FX _ OVER = • FSW 5 If the transient specification is not stringent, it is better to choose a crossover frequency that is less than one tenth of the switching frequency for good noise immunity. The resistor in the compensation network can then be calculated as: R1 Ro R2 ⎞ ⎛V ⎞ ⎛F ⎞ ⎛F 1 R= • ⎜⎜ esr ⎟⎟ • ⎜⎜ X _ OVER ⎟⎟ • ⎜ o ⎟ Gpwm •Vin • Gm ⎝ Fo ⎠ ⎝ Fesr ⎠ ⎜⎝ Vbg ⎟⎠ 2 V The compensation network includes a resistor and a capacitor in series, which terminates the output of the error amplifier to the ground. The PWM gain is inversion of the ramp amplitude, and this gain is given by: 2006 Semtech Corp. 1 sC The task here is to properly choose the compensation network for a nicely shaped loop-gain Bode plot. The following design procedures are recommended to accomplish the goal: (1) Calculate the corner frequency of the output filter: The control model of SC2608A is depicted in Fig. 4. This model can also be used to generate loop gain Bode plots. The bandgap reference is 0.8V and trimmed to +/-1% accuracy. The desired output voltage can be achieved by setting the resistive divider network, R1 and R2. The error amplifier is transconductance type with fixed 0 . 007 A gain of: © 1 1 R+ Fig. 4. SC2608A small signal model. Gm = Vramp where the ramp amplitude is fixed at 1 volts. The total control loop-gain can then be derived as follows: Compensation Network Design E/A 1 when F o < F esr < 7 F sw 5 www.semtech.com SC2608A POWER MANAGEMENT Applications Information (Cont.) An example is given below to demonstrate the procedure introduced above. (5) The compensation capacitor is determined by choosing the compensator zero to be about one fifth of the output filter corner frequency: F zero C= C o=4400uF R c=0.009 Ω Vbg=0.8V Vramp=1V Gm=0.007A/V Vin=12V Vo=2.5V Io=15A Fsw=250KHz L=2.2uH F = o 5 1 2πR • Fzero SC2608A soft start time is determined by the compensation capacitor. Capacitance can be adjusted to satisfy the soft start requirement. set (6) The final step is to generate the Bode plot by using the simulation model in Fig. 4 or using the equations provided here with Mathcad. The phase margin can then be checked using the Bode plot. C i=1nF Rc=1.33KΩ set to Rc=1.5KΩ C=327.95nF set to C=100nF for suitable soft start time Loop Gain Mag (dB) 100 50 mag( i) 0 50 10 100 1 .10 1 .10 3 4 1 .10 5 1 .10 1 .10 5 1 .10 6 Fi Loop Gain Phase (Degree) 0 45 phase ( i) 90 135 180 10 100 1 .10 1 .10 3 4 6 Fi Fig. 5. Bode plot of the loop © 2006 Semtech Corp. 8 www.semtech.com SC2608A POWER MANAGEMENT Typical Performance Characteristics V re f vs. Te m p e ra ture F re q ue nc y vs . Te m p e ra ture 0 .8 3 270 Frequency (kHz) Vref(V) 0 .8 2 0 .8 1 0 .8 0 0 .7 9 260 250 240 230 220 -5 0 -2 5 0 25 50 75 100 125 -5 0 -2 5 0 o 100 125 100 125 100 125 U V L O vs . Te m p e ra ture I_ lim it vs. Te m p e ra ture 4 .2 5 380 4 .2 0 370 UVLO (V) I_limit trip (mV) 75 Te mpe ra ture ( C ) 390 360 350 340 4 .1 5 4 .1 0 4 .0 5 330 4 .0 0 320 -5 0 -2 5 0 25 50 75 100 125 -5 0 -2 5 0 25 50 75 o o Te mpe ra ture ( C ) Te mpe ra ture ( C ) G a te d rive r d e a d tim e vs . Te m p e ra ture Ic c vs . Te m p e ra ture 40 15 14 30 Icc (mA) Gate driver dead time (ns) 50 o Te mpe ra ture ( C ) 20 13 12 11 10 9 8 7 10 -5 0 -2 5 0 25 50 75 100 125 -5 0 o 2006 Semtech Corp. -2 5 0 25 50 75 o Te m pe ra ture ( C ) © 25 Te m pe ra ture ( C ) 9 www.semtech.com SC2608A POWER MANAGEMENT Application Information TTypical ypical Application Schematic C4 100pF C3 U1 R5 1R C13 1uF/16V VCC DL C5 1uF/16V L11.2uH Q2 3 4 R4 1R C12 2.2n SC2608A C7 C8 C9 C10 C11 4.7uF /6.3V +12V SENSE GND 2 4.7uF /6.3V 5 COMP/SS DH 4.7uF /6.3V Sense 6 BST 2200uF /6.3V 68nF Phase 2200uF /6.3V C6 2.5VOUT/15A 1 IP B13N 03LA 8 7 R2 1k C2 1500uF /16V R1 2R2 C1 1500uF /16V IP B09N 03LA Q1 4.7uF /16V +12V/+5V/+3.3V R3 1k Sense R6 1k VOUT=0.8V X (R3+R6)/R6 Bill of Materials © Item Qu an ti ty Referen ce Par t Ven d er 1 1 C1 4.7u F/16V A ny 2 2 C2,C3 1500u F/16V Pan ason i c FJ 3 1 C4 100p F/50V A ny 4 2 C5,C13 1u F/16V A ny 5 1 C6 68n F/25V A ny 6 2 C7,C8 2200u F/6.3V Pan ason i c FJ 7 3 C9,C10,C11 4.7u F/6.3V A ny 8 1 C12 2.2n F A ny 9 1 L1 1.2u H A ny 10 1 Q1 IPD09N 03LA In fi n eon 11 1 Q2 IPD13N 03LA In fi n eon 12 1 R1 2R2 A ny 13 1 R2 1K A ny 14 2 R3,R6 1K, 1% A ny 15 2 R4,R5 1R0 A ny 16 1 U1 SC2608A SEMTECH 2006 Semtech Corp. 10 www.semtech.com SC2608A POWER MANAGEMENT Typical Performance Characteristics Start up Efficiency V. S. Load Current Vin 95 94 93 92 91 90 89 88 87 86 85 Comp/ SS DL VO 0 2 4 6 8 10 12 14 16 18 20 Over Current Protection (21A DC tripped) Transient Response Vin COMP/SS Comp/ SS VOUT DL IL(10A/DIV) VO 5 -18 A step load OCP HICCUP Gate waveforms Vin DH Comp/ SS Phase node DL DL VO 15 A sustain loading © 2006 Semtech Corp. 11 www.semtech.com SC2608A POWER MANAGEMENT Application Information TTypical ypical DDR VDDQ Application Schematic C4 VCC C15 1uF/16V DL 3 4 Q2 R4 2R2 1500uF /16V 1500uF /16V L1 1.2uH/40A C14 1n SC2608A C8 C9 C10 C11 C12 C13 4.7uF /6.3V SENSE GND C6 1uF/16V 4.7uF /6.3V COMP/SS DH 2 1800uF /6.3V 5 D1 BAT54H D2 1N4148 BST 1800uF /6.3V 6 Phase 1800uF /6.3V C7 68nF Sense 1.8VOUT/24A 1 IP B 09N 03LA 5VDual C3 U1 8 7 R2 1k C2 4.7uF /6.3V C5 100pF C1 1500uF /16V R1 2.2R IP B 09N 03LA Q1 4.7uF /16V 5VDual R3 1.27k Sense R5 1k +12V Bill of Materials © Item Qu an ti ty Referen ce Par t Ven d er 1 4 C1,C11,C12,C13 4.7u F/6.3V A ny 2 3 C2,C3,C4 1500u F/6.3V Pan ason i c FJ 3 1 C5 100p F/50V A ny 4 2 C6,C15 1u F/16V A ny 5 1 C7 68n F/25V A ny 6 3 C8,C9,C10 1800u F/6.3V Pan ason i c FJ 7 1 C14 1n F/50V A ny 8 1 D1 B AT54H A ny 9 1 D2 1N 4148 A ny 10 1 L1 1.2u H/40A A ny 11 1 Q1 IPD09N 03LA In fi n eon 12 1 Q2 IPD09N 03LA In fi n eon 13 2 R1,R4 2R2 A ny 14 1 R2 1K A ny 15 1 R3 1.27K, 1% A ny 16 1 R5 1K, 1% A ny 17 1 U1 SC2608A SEMTECH 2006 Semtech Corp. 12 www.semtech.com SC2608A POWER MANAGEMENT Application Information TTypical ypical High In put V oltage Application Schematic Input Voltage 20VIN Sense R6 1KR/1206 5 Vin SENSE GND VCC DL C4 1uF/16V 2 3 4 C10 2.2nF SC2608A 1KR/1206 R7 D1 8.2V C11 1uF/16V 2.2uH Q2 R4 2R2 C9 1n C6 C7 C8 4.7uF /6.3V 6 COMP/SS DH 4.7uF /6.3V C5 68n BST 5VOUT/8A 2200uF /6.3V 1K Phase L1 1 IPD 13N 03LA 8 7 R3 R2 5R1 U1 C3 10pF/Opt. C2 1000uF /25V R1 0R C1 4.7uF /25V IPD 13N 03LA Q1 R5 5.25K Sense R7 1k Bill of Materials © Item Qu an ti ty Referen ce Par t Ven d er 1 1 C1 4.7u F/25V A ny 2 1 C2 1000u F/25V Pan ason i c FJ 3 1 C3 10p F/50V , Op t. A ny 4 2 C4,C11 1u F/16V A ny 5 1 C5 68n F/16V A ny 6 1 C6 2200u F/6.3V Pan ason i c FJ 7 2 C7,C8 4.7u F/6.3V A ny 8 1 C9 1n F/50V A ny 9 1 C10 2.2n F/50V A ny 10 1 D1 Zen er 8.2V Any 11 1 L1 2.2u H/15A A ny 12 1 Q1 IPD13N 03LA In fi n eon 13 1 Q2 IPD13N 03LA In fi n eon 14 1 R1 0R A ny 15 1 R2 5.1R A ny 16 2 R3,R7 1.K, 1% A ny 17 1 R4 2R2 A ny 18 1 R5 5.25K, 1% A ny 19 2 R6,R7 1KR, 1206 A ny 20 1 U1 SC2608A SEMTECH 2006 Semtech Corp. 13 www.semtech.com SC2608A POWER MANAGEMENT Outline Drawing - SO-8 A D IM D e 2 X E /2 E1 1 E 2 ccc C 2 X N /2 T IP S .0 6 9 .0 1 0 .0 6 5 .0 2 0 .0 1 0 .1 9 7 .1 9 3 .1 5 7 .1 5 4 .2 3 6 B S C .0 5 0 B S C .0 1 0 .0 2 0 .0 4 1 .0 2 8 .0 1 6 (.0 4 1 ) 8 8 0 .0 0 4 .0 1 0 .0 0 8 .0 5 3 .0 0 4 .0 4 9 .0 1 2 .0 0 7 .1 8 9 .1 5 0 A A1 A2 b c D E1 E e h L L1 N 01 aaa bbb ccc N e /2 B D D IM E N S IO N S M IL L IM E T E R S IN C H E S M IN N O M M A X M IN N O M M A X 1 .7 5 0 .2 5 1 .6 5 0 .5 1 0 .2 5 5 .0 0 4 .9 0 4 .0 0 3 .9 0 6 .0 0 B S C 1 .2 7 B S C 0 .2 5 0 .5 0 0 .4 0 1 .0 4 0 .7 2 (1 .0 4 ) 8 0 8 0 .1 0 0 .2 5 0 .2 0 1 .3 5 0 .1 0 1 .2 5 0 .3 1 0 .1 7 4 .8 0 3 .8 0 aaa C A2 S E A T IN G PLANE C h A h A1 bxN bbb H C A -B D c GAGE P LA N E 0 .2 5 S E E D E T A IL L (L 1 ) A D E T A IL S ID E V IE W 01 A NO TES: © 1. C O N T R O L L IN G D IM E N S IO N S A R E IN M IL L IM E T E R S (A N G L E S IN D E G R E E S ). 2. DATUM S 3. D IM E N S IO N S "E 1 " A N D "D " D O N O T IN C L U D E M O L D F L A S H , P R O T R U S IO N S OR GATE BURRS. 2006 Semtech Corp. -A - AND -B - T O B E D E T E R M IN E D A T D A T U M P L A N E -H - 14 www.semtech.com SC2608A POWER MANAGEMENT Land Pattern - SO-8 X DIM (C) G Z Y C G P X Y Z DIMENSIONS INCHES MILLIMETERS (.205) .118 .050 .024 .087 .291 (5.20) 3.00 1.27 0.60 2.20 7.40 P NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. 2. REFERENCE IPC-SM-782A, RLP NO. 300A. Contact Information Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804 © 2006 Semtech Corp. 15 www.semtech.com