
ELECTRICAL CHARACTERISTICS (V = 5.0 V, T = T
TO Thigh unless otherwise specified)
CC
A
IOW
CHARACTERISTICS
Min
Symbol
Typ
Max
Unit
Frequency (V
= 0 V, C = 1.0nF, T = 25°C)
T
pin5
A
Charge Current (V
= 5.0V to 40V, T = 25°C)
CC
A
Discharge Current (V
= 5.0V to 40V, T = 25
CC
A
°C)
Discharge to Charge Current Ration (Pin 7 to V
T =
CC
A
25°C)
Current Limit Sense Voltage (
I
= I
, T = 25°C )
chg
dischg
A
OSCILLATOR
24
f
OSC
24
140
5.2
250
I
chg
I
dischg
I
/
dischg Ichg
V
ipk(sense)
33
35
220
6.5
300
kHz
A
-
mV
42
260
7.5
350
OUTPUT SWITCH (Note 2)
Saturation Voltage, Darlington Connection
(I
= 1.0A, Pins 1, 8 connected)
SW
Supply Current (V
= 5.0V to 40 V, C = 1.0 nF, Pin 7 = V
T
CC
V
> V
Pin 2 = GND remaining pins open)
pin5
th
-
V
CE(sat)
V
CE(sat)
I
CC
1.0
0.45
-
V
mA
1.3
0.7
4.0
DC Current Gain (I
= 1.0 A, V
= 5.0 V, T = 25°C)
SW
EC
A
50
h
FE
75
-
Collector Off - State Current (V
= 40 V)
CE
-
I
C(Off)
40
100
A
COMPARATOR
Threshold Voltage
T = 25°C
A
T = T
to T
A
IOW
high
1.225
1.210
V
th
1.25
-
V
1.275
1.29
Threshold Voltage Line Regulation (V
= 3.0V to 40V)
CC
Input Bias Current (V
= 0V)
IN
-
Reg
line
I
IB
1.4
-20
5.0
-400
mV
nA
TOTAL DEVICE
Note 2. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
Note 3. If the output switch is driven into hard saturation (non-arlington configuration) at low switch currents ( 300 mA) and high driver
currents ( 30 mA), it may take up to 2.0 ms for it to come out of saturation. This condition will shorten the off time at frequencies
30 kHz, and is magnified at high temperatures. This condition does not occur with a Darlington configuration, since the output
switch cannot saturate. If a non-Darlington configuration is used, the following output drive condition is recommended:
Forced b of output switch :
* The 100 W resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts.
I output
C
I driver - 7.0 mA*
C
10
G
M
3
4
0
6
3
4
Saturation Voltage (Note 3)
(I
= 1.0 A, R
= 82 W to V
, Forced b 20)
SW
Pins 8
CC
A
MICROELECTRONICS
GM34063
1.5A DC-to-DC CONVERTER CONTROL CIRCUIT
Power Management