SOT-89 Step-up Dual-Mode Switcher with Shutdown

Impala Linear Corporation

3

(408) 574-3939

www.impalalinear.com

Sept 1999

ILC6380/1 1.4

ILC6380

1

2

3

45

CE

V

OUT

C

L

+

GND

V

IN

L

SD

ILC6381

1

2

3

45

CE

V

OUT

C

L

+

L

SD

V

IN

C

B

R

B

Tr

L:

100µH ( SUMIDA, CD-54)

SD: Diode (Schottky diode; MATSUSHITA MA735)

CL: 16V 47µF (Tantalum Capacitor; NICHICON, F93)

L:

47µH ( SUMIDA, CD-54)

SD: Diode (Schottky diode; MATSUSHITA MA735)

CL: 16V 47µF (Tantalum Capacitor; NICHICON, F93)

RB: 1kW

CB: 3300pF

Tr: 2SC3279, 2SDI628G

Parameter

Symbol

Conditions

Min

Typ

Max

Units

Output Voltage

Test Circuit of Figure 2

4.875

5.000

5.125

V

Input Voltage

10

V

Oscillation Startup Voltage

0.8

V

Operation Startup Voltage

0.9

V

Supply Current 1

(See Note 2)

EXT = 10k

Ω pull-up to 5V,

78.6

131.1

µA

Supply Current 2

EXT = 10k

Ω pull-up to 5V,

6.9

13.8

µA

EXT “High” On-Resistance

EXT = 10k

Ω pull-up to 5V,

30

50

Ω

EXT “Low” On-Resistance

EXT = 10

Ω pull-up to 5V,

30

50

Ω

Oscillator Frequency

EXT = 10k

Ω pull-up to 5V, V

4.5V, Measuring of EXT waveform

85

100

115

kHz

Maximum Duty Ratio

MAXDTY

EXT = 10k

Ω pull-up to 5V, V

4.5V, Measuring of EXT high state

80

87

92

%

CE “High” Voltage

EXT = 10k

Ω pull-up to 5V, V

4.5V, Existence of Oscillation

0.75

V

CE “Low” Voltage

EXT = 10k

Ω pull-up to 5V, V

4.5V, Stopped EXT Oscillation

0.20

V

CE “High” Current

EXT: 10k

Ω pull-up to 5V,

0.25

µA

CE “Low” Current

EXT = 10k

Ω pull-up to 5V,

-0.25

µA

Efficiency

EFFI

85

%

Slow Start Time

10

msec

Notes:

1. The Schottky diode (S.D.), in figure 3 must be type MA735, with Reverse current (IR) < 1.0µA at reverse voltage (VR)=10.0V

2. “Supply Current 1” is the supply current while the oscillator is continuously oscillating. In actual operation the oscillator periodically

operates which results in less average power consumption.

Electrical Characteristics ILC6380BP-50

Typical Applications

Figure 3

Figure 4