www.austriamicrosystems.com/DC-DC_Step-Down/AS1339

Revision 1.05

6 - 25

AS1339

Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s

System Characteristics

otherwise specified), for external components refer to

Table 5 on page 7. The following parameters are verified by

characterisation and are not production tested.

Internal Oscillator Frequency

1.8

2

2.2

MHz

BYPASS

Bypass Activation Factor

2.56

2.69

2.78

V/V

On-Resistance Bypass PFET

110

200

m

Ω

230

PFET Bypass Off-Leakage

Current

= 5.5V,

0.1

3

µA

LDO1/2

Output Voltage

2.75

2.85

2.95

V

Quiescent Current

one LDO enabled

25

50

µA

both LDOs enabled

40

80

Output Current

10

mA

Current Limit

20

35

50

Dropout Voltage

3

20

50

mV

Shutdown Output Impedance

100

Ω

1. Current into supply pins without leakage of DCDC switches.

3. The dropout voltage is the input to output difference at which the output is 100mV below its nominal value.

Table 4. System Characteristics

Symbol

Parameter

Condition

Min

Typ

Max

Unit

REFIN

REFIN gain variation;

relative linearity

1

3%

REFIN gain variation;

absolute linearity

2

-2.4

2.4

%

-50

±10

50

mV

LX

Ripple voltage, PWM mode

3

Ω, no

bypass mode, no pulse-skip condition

10

25

mVp-p

Line_tr Line transient response

10µs

30

50

Load_tr Load transient response

300mA

50

70

Table 3. Electrical Characteristics (Continued)

Symbol

Parameter

Condition

Min

Typ

Max

Unit