MC33063A, MC34063A
1.5 A PEAK BOOST/BUCK/INVERTING SWITCHING REGULATORS
SLLS636D – DECEMBER 2004 – REVISED MARCH 2005
recommended operating conditions
MIN
VCC
TA
Supply voltage
MC33063A
Operating free-air temperature range
MC34063A
3
−40
0
MAX
40
85
70
UNIT
V
°C
electrical characteristics, V
CC
= 5 V, T
A
= full operating range (unless otherwise noted) (see block
diagram)
OSCILLATOR
PARAMETER
fosc
Ichg
Idischg
Idischg/Ichg
VIpk
Oscillator frequency
Charge current
Discharge current
Discharge-to-charge current ratio
Current-limit sense voltage
TEST CONDITIONS
VPIN5 = 0 V, CT = 1 nF
VCC = 5 V to 40 V
VCC = 5 V to 40 V
VPIN7 = VCC
Idischg = Ichg
TA
25°C
25°C
25°C
25°C
25°C
MIN
24
24
140
5.2
250
TYP
33
35
220
6.5
300
MAX
42
42
260
7.5
350
mV
UNIT
kHz
µA
µA
OUTPUT SWITCH (see Note 3)
PARAMETER
VCE(sat)
VCE(sat)
hFE
IC(off)
Saturation voltage – Darlington
connection
Saturation voltage – non-Darlington
connection (see Note 4)
DC current gain
Collector off-state current
TEST CONDITIONS
ISW = 1 A, pins 1 and 8 connected
ISW = 1 A, RPIN8 = 82
Ω
to VCC,
forced
b
20
ISW = 1 A, VCE = 5 V
VCE = 40 V
TA
Full range
Full range
25°C
Full range
50
MIN
TYP
1
0.45
75
0.01
100
µA
MAX
1.3
0.7
UNIT
V
V
NOTES: 3. Low duty-cycle pulse testing is used to maintain junction temperature as close to ambient temperature as possible.
4. In the non-Darlington configuration, if the output switch is driven into hard saturation at low switch currents (≤300 mA) and high driver
currents (≥30 mA), it may take up to 2
µs
for the switch to come out of saturation. This condition effectively shortens the off time at
frequencies
≥30
kHz, becoming magnified as temperature increases. The following output drive condition is recommended in the
non-Darlington configuration:
Forced
b
of output switch = IC,SW / (IC,driver − 7 mA)
≥
10,
where
7 mA is required by the 100-Ω resistor in the emitter of the driver to forward bias the Vbe of the switch.
COMPARATOR
PARAMETER
Vth
∆V
th
IIB
Threshold voltage
Threshold-voltage line regulation
Input bias current
VCC = 5 V to 40 V
VIN = 0 V
TEST CONDITIONS
TA
25°C
Full range
Full range
Full range
MIN
1.225
1.21
1.4
−20
TYP
1.25
MAX
1.275
1.29
5
−400
V
mV
nA
UNIT
TOTAL DEVICE
PARAMETER
ICC
Supply current
TEST CONDITIONS
VCC = 5 V to 40 V, CT = 1 nF,
VPIN7 = VCC, VPIN5
>
Vth,
VPIN2 = GND, all other pins open
TA
Full range
MIN
MAX
4
UNIT
mA
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
3
TI [ TEXAS INSTRUMENTS ]
