STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL SWITCHING REGULATOR CONTROLLER

S-8337/8338 Series

8

2. S-8338 Series

Table 5 Electrical Characteristics

= 3.3 V, Ta = 25°C)

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Unit

Test

Circuit

Operating input voltage

⎯

1.8

⎯

6.0

V

2

FB voltage

⎯

0.985

1.000

1.015

V

2

Current consumption

= 700 kHz

= 0.95 V

⎯

400

700

μA

1

Shutdown current

consumption

= 6.0 V

⎯

⎯

1.0

μA

1

EXT pin output current

⎯

−100

−60

mA

1

= 0.4 V

100

160

⎯

mA

1

FB voltage temperature

coefficient

ΔTa

Ta

= −40°C to +85°C

⎯

±100

⎯

ppm/

°C2

FB pin input current

⎯

−0.1

⎯

+0.1

μA

1

= 0.9 V

Waveform on EXT pin is measured

× 0.9

× 1.1

kHz

1

Oscillation frequency

temperature coefficient

ΔTa

Ta

= −40°C to +85°C

= 700 kHz

⎯

1000

⎯

ppm/

°C1

Max. duty ratio

83

88

93

%

1

Soft-start time

= 10 ms, 15 ms, 20 ms

Selectable in three steps

× 0.75

× 1. 5

ms

1

Short-circuit protection

= 50 ms

(CSP

= 0.1 μF)

37.5

50

75

ms

1

UVLO detection voltage

= 1.5 V to 2.3 V

Selected in 0.1 V steps

× 0.95

× 1.05

V

1

UVLO hysteresis width

= 0.1 V to 0.3 V

Selected in 0.1 V steps

× 0.6

× 1.4

mV

1

CC pin output current

= 2 V

−75

−50

−37.5

μA

1

= 0 V

37.5

50

75

μA

1

Timer latch reset

voltage

⎯

0.7

1.0

1.3

V

1

Shutdown pin input

voltage (High level)

⎯

1.8

⎯

⎯

V

1

Shutdown pin input

voltage (Low level)

⎯

⎯

⎯

0.3

V

1

Shutdown pin input

current (High level)

⎯

−0.1

⎯

+0.1

μA

1

Shutdown pin input

current (Low level)

⎯

−0.1

⎯

+0.1

μA

1

MHz). However, the oscillation frequency is in the range of typical values when an ideal resistor is externally connected, so actually

the fluctuation of the IC (

±10%) must be considered.

*2. The short-circuit protection time can be set by the external capacitor, and the maximum set value by the external capacitor is unlimited

= approximately 0.47 μF as a target maximum value due to the need to consider the

discharge time of the capacitor.