GM34063FS8RG datasheet(6/10 Pages) GAMMA

6 / 10 page

GM34063 series

1.5A DC TO DC

CONVERTER CONTROL

Electrical Characteristics (V

CC = 5.0V , TA = 25°C unless otherwise specified)

Parameter

Symbol

Condition

Min

Typ

Max

Unit

OSCILLATOR

Frequency

fOSC

VPIN5 = 0V, CT = 1.0nF

kHz

Charge Current

Ichg

VCC = 5.0V to 40V

Discharge Current

Idischg

VCC = 5.0V to 40V

140

220

260

µA

Discharge to Charge Current

Ratio

Idischg/Ichg

Pin 7 to VCC

5.2

6.5

7.5

Current Limit Sense Voltage

Vipk(sense)

Ichg = Idischg

250

300

350

OUTPUT SWITCH (Note 2)

Saturation Voltage 1

VCE (sat1)

Darlington Connection,

ISW = 1.0A, Pins 1, 8 Connected

TA = Full range

1.0

1.3

Saturation Voltage 2 (Note 3)

VCE (sat2)

Darlington Connection,

ISW = 1.0A, RPIN 8 = 82Ω to VCC,

Forced β= 20, TA = Full range

0.45

0.7

DC Current Gain

hFE

ISW = 1.0A, VCE = 5V

Collector Off-State Current

IC(OFF)

VCE = 40V, TA = Full range

100

µA

COMPARATOR

1.225

1.25

1.275

Note 4

1.238

1.25

1.263

Threshold Voltage

Vth

TA = Full range

1.21

1.29

Threshold Voltage Line

Regulation

Regline

VCC = 5.0V to 40V,

TA = Full range

1.4

5.0

Input Bias Current

IIB

Vin = 0V, TA = Full range

-20

-400

TOTAL DEVICE

Supply Current

ICC

VCC = 5V to 40V, CT = 1.0nF,

Pin 7 = VCC, Vpin 5 > Vth,

Pin 2 = Gnd,

remaining pins open

TA = Full range

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:

* 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

lC output

lC driver - 7.0 mA *

≥ 10

GM34063FS8RG Datasheet(PDF) 6 Page - Gamma Microelectronics Inc.

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