High Frequency 1.5A Load - Step-Down DC-DC Regulator Literature Number: JAJSAH7
1.5A DC/DC 5 SOT23 6 LLP PWM DC/DC DC/DC PCB 0.5 m BiCMOS 1.5A 130m PMOS 30ns 3V 5.5V 0.6V 550 khz 1.6MHz 3.0MHz 93% 30nA 1.5A DC/DC Matthew Reynolds 20051121 SOT23-5 3.0V 5.5V 0.6V 4.5V 1.5A 1.6MHz (X) 0.55MHz (Y) 3.0MHz (Z) 130m PMOS 0.6V 2% PWM 24070 2006 8 ds201748 5V (Vcore) HDD USB DSL 1.5A DC/DC 20060802 National Semiconductor Corporation DS201748-01-JP 1
6-Pin LLP 5-Pin SOT-23 NOPB ( ) 2
5 SOT23 1 SW 2 GND 3 FB 4 EN High VIN 0.3V 5 VIN 6 LLP 1 FB 2 GND 3 SW 4 VIND 5 VINA VINA VIND 6 EN High VINA 0.3V DAP GND 3
(Note 1) VIN FB EN SW ESD 0.5V 7V 0.5V 3V 0.5V 7V 0.5V 7V 2kV (Note 2) 150 65 150 (15 ) 220 VIN 3V 5.5V 40 125 Conditions VIN 5V T J 25 40 125 (T J ) / (Typ) T J 25 4
( ) Conditions VIN 5V T J 25 40 125 (T J ) / (Typ) T J 25 Note 1: Note 2: Note 3: 2 (70 m) 4 3 ( 75mm) 5
VIN 5.0V T J 25 vs Load "X" Vin = 5V, Vo = 1.8V & 3.3V vs Load - "Y" Vin = 5V, Vo = 3.3V & 1.8V vs Load "Z" Vin = 5V, Vo = 3.3V & 1.8V vs Load "X, Y and Z" Vin = 5V, Vo = 3.3V & 1.8V Load Regulation Vin = 3.3V, Vo = 1.8V (All Options) Load Regulation Vin = 5V, Vo = 1.8V (All Options) 6
( ) VIN 5.0V T J 25 Load Regulation Vin = 5V, Vo = 3.3V (All Options) Oscillator Frequency vs Temperature - "X" Oscillator Frequency vs Temperature - "Y" Oscillator Frequency vs Temperature - "Z" Current Limit vs Temperature Vin = 3.3V RDSON vs Temperature (LLP-6 Package) 7
( ) VIN 5.0V T J 25 RDSON vs Temperature (SOT23-5 Package) X I Q (Quiescent Current) Y I Q (Quiescent Current) Z I Q (Quiescent Current) 8
( ) VIN 5.0V T J 25 Line Regulation Vo = 1.8V, Io = 500mA V FB vs Temperature Gain vs Frequency (Vin = 5V, Vo = 1.2V @ 1A) Phase Plot vs Frequency (Vin = 5V, Vo = 1.2V @ 1A) 9
FIGURE 1. 10
1.5A PWM IC 550kHz 1.6MHz 3.0MHz DC/DC (Figure 1) (Figure 2) PMOS Low NMOS SW (V SW ) V IN (I L ) I L V REF PWM High (V D ) SW (D) FB V REF 15% FB 15 PMOS (UVLO) 2.73V (typ) UVLO 430mV V IN 2.3V (typ) V IN 2.5A (typ) IC 165 150 (D) (V O ) (V IN ) (D1) PMOS D FIGURE 2. Typical Waveforms V OUT 0V 0.6V 600 s V SW V SW I OUT R DSON (V D ) 0.3V 0.7V V D (1.8A) (I LPK ) I LPK I OUT i L 11
( ) RMS (I RMS-IN ) FIGURE 3. Inductor Current i L 0.1 (I OUT ) 0.2 (I OUT ) 1.50A i L 20% 1.8A 1.8A i L 2.5A D 0.5 RMS D 0.5 RMS ESL ESL 0805 (2012) ESL ESL (2 fl) POSCAP SP (MLCC) ESL MLCC X7R X5R 1.0A 1.25A 1.25A 2.5A 5 (R DCR ) V IN RMS ESL ( ) 22 F MLCC ESR 90 MLCC 2 1 22 F X7R X5R 12
( ) (D1) I D1 I OUT (1 D) R2 FB R1 V O FB R2 10k (Vo 0.6V) R1 0 100 R2 10k D1 2 ( ) IC CIN D1 ( ) 2 FB FB IC R1 IC R2 V OUT V IN SW V OUT AC IC AN-1229 4 V REF 0.60V 13
DC/DC PFET (10% 90%) P SWR 1/2 (V IN I OUT F SW T RISE ) P SWF 1/2 (V IN I OUT F SW T FALL ) 2% (P LOSS ) 2 ( ) (D) P SW P SWR P SWF P Q I Q V IN I Q 0.55MHz 2.5mA Power Loss Tabulation V SW PFET V SW I OUT R DSON V D (V DCR ) P DIODE V D I OUT (1 D) 1 P IND I 2 OUT R DCR PFET P COND I 2 OUT R DSON D P COND P SW P DIODE P IND P Q P LOSS P COND P SWF P SWR P Q P INTERNAL P INTERNAL 183mW T J T A R JC R JA / ( ) PCB 14
( ) 15 150 R JA R JA PCB SW PFET 165 R JA PCB PCB R JA PCB LLP 4 6 (Vin Vo Io ) 1: 2 R JC IC 6 R JC R JC 6 LLP R JC 30 /W LLP R JA 4 PCB 1/2 FR4 2 3.0cm 3.0cm 144 P INTERNAL 189mW 125 109 T j (R JA P LOSS ) T A LLP 125 (111 /W 189mW) 104 T j (R JC P LOSS ) T C T j (R JC P INTERNAL ) T C T j 30 /W 0.189W T C 2 R JA 165 FIGURE 4. Internal LLP Connection PCB (Figure 6 ) R JA 15
LLP FIGURE 5. 6-Lead LLP PCB Dog Bone Layout 16
X 1 FIGURE 6. X (1.6MHz): Vin = 5V, Vo = 1.2V @ 1.5A Bill of Materials 17
X 2 FIGURE 7. X (1.6MHz): Vin = 5V, Vo = 0.6V @ 1.5A Bill of Materials 18
X 3 FIGURE 8. X (1.6MHz): Vin = 5V, Vo = 3.3V @ 1.5A Bill of Materials 19
Y 4 FIGURE 9. Y (550kHz): Vin = 5V, Vout = 3.3V @ 1.5A Bill of Materials 20
Y 5 FIGURE 10. Y (550kHz): Vin = 5V, Vout = 1.2V @ 1.5A Bill of Materials 21
Z 6 FIGURE 11. Z (3MHz): Vin = 5V, Vo = 3.3V @ 1.5A Bill of Materials 22
Z 7 FIGURE 12. Z (3MHz): Vin = 5V, Vo = 1.2V @ 1.5A Bill of Materials 23
X 8: FIGURE 12. X (1.6MHz): Vin = 5V, Vo = 1.2V @ 1.5A & 3.3V @1.5A Bill of Materials 24
X 9: LDO FIGURE 13. X (1.6MHz): Vin = 5V, Vo = 3.3V @ 1.5A & LP2986-5.0 @ 150mA Bill of Materials 25
inches (millimeters) 5-Lead SOT-23 Package NS Package Number MF05A 6-Lead LLP Package NS Package Number SDE06A millimeters 26
1.5A DC/DC (CEO) (GENERAL COUNSEL) a (b) National Semiconductor Copyright 2007 National Semiconductor Corporation www.national.com 135-0042 2-17-16 / TEL.(03)5639-7300
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