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BM34063
DC-DC CONVERTER
Features
3V to 40V Input Voltage Operation Internal 1.6A Peak Current Switch Internal 1.8% Reference Low Quiescent Current at 1.6mA Frequency Operation from 100Hz~100KHz Output Voltage Adjustable Active Current Limiting Step-Up, Step-Down or Inverting Switching Regulators
Description
The BM34063 Series is a monolithic control circuit containing the primary functions required for DC-to-DC converters. These devices consist of an internal temperature compensated reference, comparator, controlled duty cycle oscillator with an active current limit circuit, driver and high current output switch.
Pin Assignment
DIP/SOP-8
1 2 3 4 SW C SW E TC GND DRC Ipk VCC FB 8
Pin1: Switch Collector (SWC) Pin2: Switch Emitter (SWE)
7 6 5
Pin5: Comparator Inverting Input (FB) Pin6: Voltage Supply (Vcc) Pin7: Ipk Sense (Ipk) Pin8: Voltage Driver Collector (DRC)
Pin3: Timing Capacitor (TC) Pin4: Ground (GND)
Ordering Information
Part Number BM34063P BM34063S Package DIP-8 SOP-8
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BM34063
DC-DC CONVERTER
Absolute Maximum Ratings
(Ta=25C, Unles Otherwise Specified) Parameter Power Supply Voltage Comparator Input Voltage Range Switch Collector Voltage Switch Emitter Voltage Switch Emitter to Collector Voltage Driver Collector Voltage Switch Current Power Dissipation at Ta=25oC Operating Ambient Temperature Range Storage Temperature Range Operating Junction Temperature Thermal Resistance Junction-ambient Symbol VCC Vir VC(SW) VSWE VCE VC(DR) ISW PD Topr Tstg Topj JA DIP-8 SO-8 0~+70 -65~+150 120 125
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Value 40 -0.3~+40 40 40 40 40 1.5 1 0.625
Unit V V V V V V A W
o o o
C C C
C/W
Block Diagram
SC
Pin1: 1.6A Switch Collector Q2 Q1 80 Q S R
DRI
Pin8: Driver Collector
IPK
CT Oscillator IPK Pin7: Highside Current Sense Input, VCC-VIPK=300mV
SE
Pin2: Darlington Switch Emitter
TC
Pin3: Oscilletor Timing Capacitor 1.25V Reference Voltage
VCC
Comparator Pin6: Power Supply Input
+ FB
Pin5: Feedback Comparator Inverting Input
GND
Pin4: Power GND
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BM34063
DC-DC CONVERTER
Electrical Characteristics (VCC=5V,Ta=0~70C, unless otherwise specified)
Parameter Oscillator Charging Current Discharge Current Frequency Discharge to Charge Current Ratio Current Limit Sense Voltage Output Switch Saturation Voltage, Darlington Connection Saturation Voltage DC Current Gain Collector Off-State Current Comparator Threshold Voltage Threshold Voltage Line Regulation Input Bias Current Total Device Supply Current ICC VCC=5~40V, VPIN7=VCC, VPin5>VFB, CT=0.001uF, Pin7=GND, Remaining pins open 1.6 3 mA VFB VFB IIB VCC=5~40V VIN=0V 1.23 1.25 1.5 40 1.27 6 400 V mV nA VCE(sat) 1 VCE(sat) 2 hFE ICC(off) ISW=1A, VC(SW)=VC(DR) ISW=1A, IC(DR)=50mA ISW=1A, VCE=5V VCE=40V, Ta=25 C
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Symbol Ichg Idischg fOSC Idischg/Ichg VIPK
Test Condition VCC=5~40V, Ta=25oC VCC=5~40V, Ta=25 C VPIN5=0, CT=1nF, Ta=25 C VPIN7=VCC, Ta=25 C Idischg=Ichg, Ta=25 C
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Min. 10 140 28 5.2 250
Typ. 25 190 33 6 300
Max. 40 240 40 7.5 350
Unit uA uA KHz mV
35 -
1 0.4 120 10
1.3 0.7 100
V V uA
Application Information
Design Formula Table Calculation ton/toff (ton+toff) max CT IC(sw) RS L(min) CO Step-Down (Vout+VF)/(Vin(min) -Vsat-Vout) 1/Fmin 4*10 ton 2*Iout(max) 0.3/IC(sw) (Vin(min)-Vsat/Ipk(sw))*ton(max) (Ipk(sw)*(ton+toff))/(8*Vripple(P-P))
-5
Step-Up (Vout+VF-Vin(min))/(Vin(min)-Vsat) 1/Fmin 4*10 ton 2*Iout(max)(ton+toff/toff) 0.3/IC(sw) (Vin(min)-Vsat/Ipk(sw))*ton(max) Iout*ton/Vripple(P-P)
-5
Voltage-Inverting (|Vout|+VF)/(Vin(max)-Vsat) 1/Fmin 4*10-5ton 2*Iout(max)(ton+toff/toff) 0.3/IC(sw) (Vin(min)-Vsat/Ipk(sw))*ton(max) Iout*ton/Vripple(P-P)
Vsat: Saturation voltage of the output switch. VF: Forward voltage drop of the ringback rectifier. The following power supply characteristics must be chosen: Vin: Nominal input voltage. Vout: Desired output voltage. |Vout|=1.25*(1+RB/RA) Iout: Desired output current Fmin: Minimum desired output switching frequency at the selected values for Vin and Iout. Vripple(P-P): Desired peak to peak output ripple voltage in practice, the calculated value will need to be increased due to the capacitor equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly effect the line and load regulation.
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BM34063
DC-DC CONVERTER
Application Information (Continued)
L1 R1
150 200uH
D1
H1N5819
Vout 28V / 200mA Cout
220uF
BM34063
8 7 6 1 2 3 4
RSC
0.22
Vin C1
100uF
5
CT
680pF
RB RA
2.2k 47k
Line Regulation: 100mV (Vin=8V~16V, @Io=200mA) Load Regulation: 5mV (Vin=12V, @Io=80mA~200mA)
Fig.2 Step-Up Converter
L1 BM34063 R1
8 7 1 2 3 4
Vout D1
RSC Vin C1
6 5
Q1 CT R2
Cout
RB RA
Fig.3 Step-Up Converter With External NPN Switch
BM34063
8 7 1 2 3 4
L1
200uH
Vout 5V / 500mA Cout
RSC
0.25
6 5
D1
H1N5819
470uF
Vin
CT
470pF
C1
100uF
RB RA
1.2k 3.6k
Line Regulation: 40mV (Vin=10V~20V, @Io=500mA) Load Regulation: 5mV (Vin=15V, @Io=10mA~500mA) Short Circuit Current: 1.3A (Vin=15V, @RL=0.1
Fig.4 Step-Down Converter
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BM34063
DC-DC CONVERTER
BM34063 R2
8 7 1 2 3 4
R1 Q1 L1 Vout
RSC Vin
6 5
CT
D1
Cout
RB C1 RA
Fig.5 Step-Down Converter With External PNP Saturation Switch
D1 BM34063
8 1 2 3 4
H1N5819
Vout -12V / 100mA
RSC
0.25
7 6 5
L1
100uH
Cout
470uF
Vin 4.5V-6V
CT
680pF
C1
100uF
RA RB
8.2k 953
Line Regulation: 20mV (Vin=4.5V~6V, @Io=100mA) Load Regulation: 100mV (Vin=5V, @Io=10mA~100mA)
Fig.6 Voltage Inverting Converter
BM34063
8 1 2 3 4
R2 R1 Q1
RSC
7 6
L1 D1 CT Vout
Vin
5
RA C1 RB Cout
Fig.7 Voltage Inverting Converter With External PNP Saturation Switch
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BM34063
DC-DC CONVERTER
DIP-8 (P) Dimension
DIM A B C D E F G H I J K L M 1 Min. 6.29 9.22 3.25 3.17 0.38 2.28 7.49 8.56 0.229 o 94 Max. 6.40 9.32 *1.52 *1.27 *0.99 3.35 3.55 0.53 2.79 7.74 *3.00 8.81 0.381 o 97
8
7
6
5
A
1 2 3 4
B
J F
C
E D
G H
1 K
M L
8-Lead DIP-8 Plastic Package
*: Typical, Unit: mm
I
SOP-8 (S) Dimension
A G
DIM A B C D E F G H I J K L M N O Min. 4.85 3.85 5.80 1.22 0.37 3.74 1.45 4.80 0.05 0.30 0.19 0.37 0.23 0.08 0.00 Max. 5.10 3.95 6.20 1.32 0.47 3.88 1.65 5.10 0.20 0.70 0.25 0.52 0.28 0.13 0.15
8 B
7
6
5 C 4 J H
I
Pin1 Index
2
3
D
E
Part A
K L N O
Part A
M
*: Typical, Unit: mm
F
8-Lead SO-8 Plastic Surface Mounted Package
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BM34063
DC-DC CONVERTER
Soldering Methods
1. Storage environment: Temperature=10oC~35oC Humidity=65%15% 2. Reflow soldering of surface-mount devices Figure 1: Temperature profile
tP TP Ramp-up TL Tsmax Temperature tL Critical Zone TL to TP
Tsmin tS Preheat
Ramp-down
25 t 25oC to Peak Time
Profile Feature Average ramp-up rate (TL to TP) Preheat - Temperature Min (Tsmin) - Temperature Max (Tsmax) - Time (min to max) (ts) Tsmax to TL - Ramp-up Rate Time maintained above: - Temperature (TL) - Time (tL) Peak Temperature (TP) Time within 5 C of actual Peak Temperature (tP) Ramp-down Rate Time 25oC to Peak Temperature 3. Flow (wave) soldering (solder dipping) Products Pb devices. Pb-Free devices.
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Sn-Pb Eutectic Assembly <3 C/sec 100oC 150oC 60~120 sec <3oC/sec 183oC 60~150 sec 240oC +0/-5oC 10~30 sec <6oC/sec <6 minutes
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Pb-Free Assembly <3oC/sec 150oC 200oC 60~180 sec <3oC/sec 217oC 60~150 sec 260oC +0/-5oC 20~40 sec <6oC/sec <8 minutes
Peak temperature 245 C 5 C
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Dipping time 5sec 1sec 5sec 1sec
260 C +0/-5 C
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