GM34063 series
1.5A DC TO DC
CONVERTER CONTROL
Electrical Characteristics
(V
CC
= 5.0V , T
A
= 25°C unless otherwise specified)
Parameter
OSCILLATOR
Frequency
Charge Current
Discharge Current
Discharge to Charge Current
Ratio
Current Limit Sense Voltage
f
OSC
I
chg
I
dischg
I
dischg
/I
chg
V
ipk(sense)
V
PIN5
= 0V, C
T
= 1.0nF
V
CC
= 5.0V to 40V
V
CC
= 5.0V to 40V
Pin 7 to V
CC
I
chg
= I
dischg
24
24
140
5.2
250
33
35
220
6.5
300
42
42
260
7.5
350
kHz
μA
µA
-
mV
Symbol
Condition
Min
Typ
Max
Unit
OUTPUT SWITCH (Note 2)
Saturation Voltage 1
V
CE (sat1)
Darlington Connection,
I
SW
= 1.0A, Pins 1, 8 Connected
T
A
= Full range
Darlington Connection,
I
SW
= 1.0A, R
PIN 8
= 82Ω to V
CC
,
Forced
β=
20, T
A
= Full range
I
SW
= 1.0A, V
CE
= 5V
V
CE
= 40V, T
A
= Full range
50
-
1.0
1.3
V
Saturation Voltage 2 (Note 3)
DC Current Gain
Collector Off-State Current
V
CE (sat2)
h
FE
I
C(OFF)
0.45
75
40
0.7
V
-
100
µA
COMPARATOR
1.225
Threshold Voltage
Vth
Note 4
T
A
= Full range
Threshold Voltage Line
Regulation
Input Bias Current
Reg
line
I
IB
V
CC
= 5.0V to 40V,
T
A
= Full range
Vin = 0V, T
A
= Full range
1.238
1.21
-
1.4
-20
1.25
1.25
1.275
1.263
1.29
5.0
-400
mV
nA
V
TOTAL DEVICE
V
CC
= 5V to 40V, C
T
= 1.0nF,
Pin 7 = V
CC
, Vpin 5 > Vth,
Pin 2 = Gnd,
remaining pins open
T
A
= Full range
Supply Current
I
CC
50
75
mA
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-Darlington 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
β
of output switch:
l
C
output
l
C
driver - 7.0 mA
*
≥
10
GM34063
V2.00
6
* The 100
Ω
resistor in the emitter of the driver device requires about
7.0 mA before the output switch conducts.
Note 4. 1% accuracy is available upon special request
GAMMA [ GAMMA MICROELECTRONICS INC. ]
