1A/2B/3B
1A/2B/3B 1A/2B/3BCMOSPWMDC/DCIC 1APWMLx Lx 3DC/DC PWM ICPWMVFMDC/DC TYP. 15µA31A TYP. 2µA PWMDC/DC 2B/3B1AEXT ON 1mA 3B MAX..5µA... 1A... TYP. 15µA31A 1mA... MAX..9V... 2.5... TYP. 85... TYP. ppm/... MIN. µs... SOT-891A2BSOT-89-53B 1
Lx Vss LxSW VLX limiter Buffer PWM control Slow start Phase Comp. Vref OUT EXT OSC + Error Amp. Chip Enable CE 2
5 4 (mark side) (mark side) 1 2 3 1 2 3 No. 1A 2B 3B 1 1 5 2 2 2 3 4 3 3 1 VSS OUT Lx EXT CE IC TrCMOS Low 3
VOUT OUT VLX Lx 1 VEXT EXT 2 VCE CE 3 ILX Lx 1 IEXT EXT 2 PD Topt Tstg Tsolder 4
µ µ µ 1 VINµsVrefVHVref 2ILXLxonVLXVLXlimLxLx off 5
4.875 5. 5.125 V 8 V IOUT=1mAVIN2V.8.9 V IOUT=1mAVINV.7 V OUT 3 45 µa OUTVIN5.5V 2 5 µa VLX.4V ma VLX6VVIN5.5V.5 µa khz on (VLXL) 85 VOUT5V.5 2. ms Lxon.65.8 1. V 1 VINµsVrefVHVref 2ILXLxonVLXVLXlimLxLx off 6
µ µ 1 VINµsVrefVHVref 4.875 5. 5.125 µ µ 1 VINµsVrefVHVref 7
VOUT VIN Vstart Vhold IDD1 IDD2 ILX ILXleak IEXTH IEXTL VCEH1 VCEL1 VCEH2 VCEL2 ICEH ICEL fosc Maxdty tstart VLXlim 1 2 Lx Lx EXTH EXTL CEH1 CEL1 CEH2 CEL2 CEH CEL 1 VLX 2 2.925 3. 3.75 V 8 V IOUT1mAVIN2V.8.9 V IOUT1mAVINV.7 V 85 OUT 3 µa OUTVIN3.5V 2 5 µa VLX.4V ma VLX6VVIN3.5V.5 µa VEXTVOUT.4V 1.5 ma VEXT.4V 1.5 ma VOUT1.5V VOUT.4 V VOUT1.5V.4 V.8VVOUT1.5V VOUT.1 V.8VVOUT1.5V.1 V CE3V.5 µa CEV.5 µa 1 khz on (VLXL) VOUT3V.5 2. ms Lxon.65.8 1. V 1 VINµsVrefVHVref 2ILXLxonVLXVLXlimLxLx off 8
µ µ µ µ µ 1 VINµsVrefVHVref 2ILXLxonVLXVLXlimLxLx off 9
i2 L SD IOUT IL ILmin ILmax topen VIN i1 VOUT Lx Tr CL ton toff t T=1/fosc 1
11
12
3.1 3.1 L= 2µH VOUT(V) 3. 2.9 2.8 2.7 1.5V 2.V 2.6 VIN =1.V 2.5 IOUT(mA) VOUT(V) 3. 2.9 2.8 2.7 1.5V 2.6 VIN=1.V 2.V 2.5 1 3 IOUT(mA) 5.2 5.2 L=2µH VOUT(V) 5. 4.8 4.6 4.4 4.2 VIN= 1.V 2.V 3.V 4.V 4. 1 IOUT(mA) VOUT(V) 5. 4.V 4.8 3.V 4.6 2.V 4.4 4.2 VIN=1.V 4. 1 IOUT(mA) VOUT(V) 3.1 3. 2.9 1.5V 2.V 2.5V VOUT(V) 5.2 5. 4.8 4.6 2.V 3.V 4.V VIN=.9V 2.8 IOUT(mA) VIN=1.5V 4.4 IOUT(mA) 13
L=2µH η(%) VIN=1.V 1.5V 2.V η(%) VIN=1.V 1.5V 2.V 1 3 IOUT(mA) 1 3 IOUT(mA) L=2µH η(%) VIN=1.V 2.V 3.V 4.V η(%) VIN= 1.V 2.V 3.V 4.V 1 IOUT(mA) 1 IOUT(mA) L = 28µH η(%) VIN=.9V 1.5V 2.V 2.5V η(%) VIN=1.5V 2.V 3.V 4.V IOUT(mA) IOUT(mA) 14
L=2µH IIN (µa) 3 1 IIN (µa) 3 1 1. 1.2 1.4 1.6 1.8 2. VIN(V) 1. 1.2 1.4 1.6 1.8 2. VIN(V) L=2µH IIN (µa) 1 IIN (µa) 1 1 2 3 4 VIN(V) 1 2 3 4 VIN(V) Vr (mv p-p) 2.V 3.V VIN=.9V 3 1 1 5 1 3 IOUT(mA) Vr (mv p-p) 3.V 4.V 2.V VIN=.9V 3 1 1 5 1 3 IOUT(mA) 15
L=2µH L=2µH Vr (mv p-p) 3 1 VIN=.9V 2.V 3.V Vr (mv p-p) 3 1 2.V 3.V VIN=.9V 4.V 1 1 3 IOUT(mA) 1 1 3 IOUT(mA) Vr (mv p-p) 3 1 VIN=.9V 2.V 3.V Vr (mv p-p) 1 VIN=.9V 2.V 3.V 4.V 1 1 IOUT(mA) 1 1 2 IOUT(mA) / Vstart/Vhold (V) 1.4 1.2 1. Vstart.8.6 Vhold.4.2 1 3 IOUT(mA) / Vstart/Vhold (V) 1.6 1.4 1.2 Vstart 1..8.6 Vhold.4.2 1 3 IOUT(mA) 16
/ Vstart/Vhold (V) 1.4 1.2 1. Vstart.8.6.4 Vhold.2 IOUT(mA) / Vstart/Vhold (V) 1.4 1.2 1..8.6.4.2 Vstart Vhold IOUT(mA) 3.2 IOUT=1mA VIN=2V 5.2 IOUT=1mA VIN=3V VOUT (V) 3.1 3. 2.9 2.8 VOUT (V) 5.1 5. 4.9 4.8 2.7 Topt() 4.7 Topt() 3.2 IOUT=1mA VIN=2V 5.2 IOUT=1mA VIN=3V VOUT (V) 3.1 3. 2.9 2.8 VOUT (V) 5.1 5. 4.9 4.8 2.7 Topt() 4.7 Topt() 17
1.2 1. Vstart(V) 1..8.6.4.2 Vhold(V).8.6.4.2 Topt() Topt() 5 1 IDD1(µA) 2 IDD2(µA) 4 3 2 1 Topt() Topt() 1 1. ILX (ma) 125 75 25 ILXleak (µa).8.6.4.2 Topt() Topt() 18
fosc(khz) 3 1 IOUT=1mA VIN=2V Tops() fosc(khz) IOUT=1mA VIN=3V 3 1 Topt() 1 IOUT=1mA VIN=2V 1 IOUT=1mA VIN=3V fosc(khz) 1 fosc(khz) 1 Topt() Topt() Maxdty(%) IOUT=1mA VIN=2V Topt() Maxdty(%) IOUT=1mA VIN=3V Topt() 19
Maxdty(%) IOUT=1mA VIN=2V Topt() Maxdty(%) IOUT=1mA VIN=3V Topt() 1.2 VLX VLXlim(V) 1..8.6.4.2. Topt() 1 1 EXT H IEXTH(mA) 8 6 4 2 Topt() EXT L IEXTL(mA) 8 6 4 2 Topt()
5. IOUT=1mA-3mA VIN=2V 2 7. IOUT=1mA-3mA VIN=3V 2 4.5 21 6.5 21 VOUT (V) 4. 3.5 3. 2.5 2. 1.5 1 1 1 3 IOUT(mA) VOUT (V) 6. 5.5 5. 4.5 4. 3.5 1 1 1 3 IOUT(mA) 1. t(ms) 3. t(ms) 5. IOUT=1mA-3mA VIN=2V 2 7. IOUT=1mA-3mA VIN=3V 2 4.5 21 6.5 21 VOUT (V) 4. 3.5 3. 2.5 2. 1.5 1 1 1 3 IOUT(mA) VOUT (V) 6. 5.5 5. 4.5 4. 3.5 1 1 1 3 IOUT(mA) 1. t(ms) 3. t(ms) 21
VOUT (V) 5.18~5. 5.16~5.18 5.14~5.16 5.12~5.14 5.1~5.12 5.8~5.1 5.6~5.8 5.4~5.6 5.2~5.4 5.~5.2 4.98~5. 4.96~4.98 4.94~4.96 4.92~4.94 4.~4.92 4.88~4. 4.86~4.88 4.84~4.86 4.82~4.84 4.~4.82 5 1 15 25 3 35 (%) fosc (khz) 59~ 58~59 57~58 56~57 55~56 54~55 53~54 52~53 51~52 ~51 49~ 48~49 47~48 46~47 45~46 44~45 43~44 42~43 41~42 ~41 5 1 15 25 (%) 22
Diode Inductor Lx OUT VOUT VIN Vss + Capacitor µ µ Inductor Diode Cb EXT OUT VOUT VIN Tr Rb Vss + Capacitor L 28µH D HRP22 CL µf Tr 2SD1628G Rb 3Ω Cb.1µF 23
24 VIN Inductor Diode Lx OUT Vss VOUT + Capacitor EXT CE NC µ µ VIN Inductor Diode Lx OUT Vss VOUT + Capacitor Cb Rb Tr EXT CE NC L 28µH D HRP22 CL µf Tr 2SD1628G Rb 3Ω Cb.1µF
Diode Inductor NC 3B Lx OUT EXT CE Vss Pull-up resistor VOUT VIN + Capacitor CE Tr 25
Inductor Diode VOUT 2B ZD:6.8V VIN Cb EXT OUT + Capacitor Tr Rb Vss RZD Starter Circuit Inductor PNP Tr VOUT Rb2 Diode 1A VIN Rb1 Lx OUT Vss + Capacitor Starter Circuit 26
Trans1:1 Diode VOUT 1A VIN Lx Vss OUT + Capacitor Starter Circuit Starter Circuit VIN side VOUT side VIN side VOUT side RST Tr Starter Circuit ZDST Ω 27
µ 28