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

chg

dischg

A

OSCILLATOR

24

f

OSC

24

140

5.2

250

I

chg

I

dischg

I

/

V

ipk(sense)

33

35

220

6.5

300

kHz

µA

µA

-

mV

42

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

CC

V

> V

Pin 2 = GND remaining pins open)

pin5

th

-

-

-

V

CE(sat)

V

CE(sat)

I

CC

1.0

0.45

-

V

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

µA

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

4

Saturation Voltage (Note 3)

(I

= 1.0 A, R

= 82 W to V

, Forced b 20)

SW

Pins 8

CC

A

A

MICROELECTRONICS

GM34063

1.5A DC-to-DC CONVERTER CONTROL CIRCUIT

Power Management