LMZ14202 LMZ14202 2A SIMPLE SWITCHER® Power Module with 42V Maximum Input Voltage Literature Number: SNVS648D
LMZ14202 2A SIMPLE SWITCHER® Power Module with 42V Maximum Input Voltage Easy To Use 7 Pin Package Performance Benefits ■ Operates at high ambient temperature with no thermal derating ■ High efficiency reduces system heat generation ■ Low radiated emissions (EMI) complies with EN55022 class B standard ■ Low external component count 30114586 TO-PMOD 7 Pin Package 10.16 x 13.77 x 4.57 mm (0.4 x 0.542 x 0.18 in) θJA = 20°C/W, θJC = 1.9°C/W RoHS Compliant System Performance Efficiency VIN = 24V VOUT = 5.
LMZ14202 Simplified Application Schematic 30114501 Connection Diagram 30114502 Top View 7-Lead TO-PMOD Ordering Information Order Number Package Type NSC Package Drawing Supplied As LMZ14202TZ-ADJ TO-PMOD-7 TZA07A 250 Units in Tape and Reel LMZ14202TZX-ADJ TO-PMOD-7 TZA07A 500 Units in Tape and Reel LMZ14202TZE-ADJ TO-PMOD-7 TZA07A 45 Units in a Rail Pin Descriptions Pin Name Description 1 VIN Supply input — Nominal operating range is 6V to 42V .
6 7 EP Name Description FB Feedback — Internally connected to the regulation, over-voltage, and short-circuit comparators. The regulation reference point is 0.8V at this input pin. Connected the feedback resistor divider between the output and ground to set the output voltage. VOUT Output Voltage — Output from the internal inductor. Connect the output capacitor between this pin and exposed pad. EP Exposed Pad — Internally connected to pin 4. Used to dissipate heat from the package during operation.
LMZ14202 For soldering specifications: see product folder at www.national.com and www.national.com/ms/MS/MS-SOLDERING.pdf Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. VIN, RON to GND EN, FB, SS to GND Junction Temperature Storage Temperature Range ESD Susceptibility(Note 2) Operating Ratings -0.3V to 43.5V -0.
Min (Note 3) Typ (Note 4) Max (Note 3) Parameter Conditions Units η Efficiency VIN = 24V VO = 3.3V IO = 1A 86 % η Efficiency VIN = 24V VO = 3.3V IO = 2A 85 % Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics.
LMZ14202 Efficiency 24V Input @ 25°C Dissipation 24V Input @ 25°C 30114526 30114527 Efficiency 36V Input @ 25°C Dissipation 36V Input @ 25°C 30114529 30114530 Efficiency 42V Input @ 25°C Dissipation 42V Input @ 25°C 30114550 www.national.
LMZ14202 Efficiency 6V Input @ 85°C Dissipation 6V Input @ 85°C 30114534 30114533 Efficiency 8V Input 85°C Dissipation 8V Input 85°C 30114541 30114540 Efficiency 12V Input@ 85°C Dissipation 12V Input @ 85°C 30114543 30114542 7 www.national.
LMZ14202 Efficiency 24V Input @ 85°C Dissipation 24V Input @ 85°C 30114545 30114544 Efficiency 36V Input @ 85°C Dissipation 36V Input @ 85°C 30114547 30114546 Efficiency 42V Input @ 85°C Dissipation 42V Input @ 85°C 30114552 www.national.
LMZ14202 Line and Load Regulation @ 25°C Line and Load Regulation @ 85°C 30114548 30114569 Output Ripple 24VIN 3.3VO 2A, BW = 200 MHz Transient Response 24VIN 3.3VO 0.6A to 2A Step 30114506 30114505 Thermal Derating VOUT = 3.3V Current Limit 1.8VOUT @ 25°C 30114570 30114565 9 www.national.
LMZ14202 Current Limit 3.3VOUT @ 25°C Current Limit 3.
Use of a 0.022μF capacitor results in 2.2msec soft-start duration which is recommended as a minimum value. As the soft-start input exceeds 0.8V the output of the power stage will be in regulation. The soft-start capacitor continues charging until it reaches approximately 3.8V on the SS pin. Voltage levels between 0.8V and 3.8V have no effect on other circuit operation.
LMZ14202 If ΔVIN is 1% of VIN for a 24V input to 3.3V output application this equals 240 mV and fSW = 400 kHz. Following is a comparison pair of waveforms of the showing both CCM (upper) and DCM operating modes. CIN≥ 2A * 3.3V/24V * (1– 3.3V/24V) / (400000 * 0.240 V) ≥ 2.5μF CCM and DCM Operating Modes VIN = 24V, VO = 3.3V, IO = 2A/0.
θCA = (125 — 85) / 1.5W — 1.9) = 24.8 To reach θCA = 24.8, the PCB is required to dissipate heat effectively. With no airflow and no external heat, a good estimate of the required board area covered by 1 oz. copper on both the top and bottom metal layers is: Board Area_cm2 = 500°C x cm2/W / θJC (19) As a result, approximately 20.2 square cm of 1 oz copper on top and bottom layers is required for the PCB design. The PCB copper heat sink must be connected to the exposed pad.
LMZ14202 PRE-BIASED STARTUP The LMZ14202 will properly start up into a pre-biased output. This startup situation is common in multiple rail logic applications where current paths may exist between different power rails during the startup sequence. The following scope capture shows proper behavior during this event. Additional Features OUTPUT OVER-VOLTAGE COMPARATOR The voltage at FB is compared to a 0.92V internal reference. If FB rises above 0.92V the on-time is immediately terminated.
LMZ14202 Evaluation Board Schematic Diagram 30114507 Ref Des Description Case Size Case Size U1 SIMPLE SWITCHER ® TO-PMOD-7 National Semiconductor Manufacturer P/N LMZ14202TZ Cin1 1 µF, 50V, X7R 1206 Taiyo Yuden UMK316B7105KL-T Cin2 10 µF, 50V, X7R 1210 Taiyo Yuden UMK325BJ106MM-T CO1 1 µF, 50V, X7R 1206 Taiyo Yuden 'UMK316B7105KL-T CO2 100 µF, 6.3V, X7R 1210 Taiyo Yuden JMK325BJ107MM-T RFBT 3.32 kΩ 0603 Vishay Dale CRCW06033K32FKEA RFBB 1.
LMZ14202 30114516 30114517 www.national.
LMZ14202 Physical Dimensions inches (millimeters) unless otherwise noted 7-Lead TZA Package NS Package Number TZA07A 17 www.national.
LMZ14202 2A SIMPLE SWITCHER® Power Module with 42V Maximum Input Voltage Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Design Support Amplifiers www.national.com/amplifiers WEBENCH® Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.
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