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AS1341-BTDT
(Rev.:2007)

20V, 600mA, 100% Duty Cycle, Step-Down Converter

austriamicrosystems AG 

AS1341

Data Sheet - Electrical Characteristics

6 Electrical Characteristics

DC Electrical Characteristics

VIN = +12V, SHDNN = VIN, TAMB = -40 to +85ºC. Typical values are at TAMB = +25ºC (unless otherwise specified).

Specifications based on circuit shown in Figure 1 on page 1.

Table 3. Electrical Characteristics

Symbol

Parameter

Conditions

Min Typ Max Units

VIN

Input Voltage Range

4.5

20

V

VOUT

Output Voltage (Preset Output)

Output Voltage (Adjustable)

FB = GND

4.85 5.00 5.15

V

1.25

VIN

VDROPOUT

Dropout Voltage

IOUT = 600mA, ILIMIT = VIN

250

mV

Line Regulation

VIN = 6V to 20V, 200Ω load

0.1

%/V

Load Regulation

ILIMIT = VIN, IOUT = 0 to 500mA

1

%

VFB

Feedback Set Voltage

(Adjustable Output)

1.212 1.25 1.288 V

IIN

Input Supply Current

No load

12

18 µA

IINDROP

Input Supply Current in

Dropout

No load

45

60 µA

Input Shutdown Current

SHDNN = GND

0.8

3

µA

VUVLO

Input Undervoltage Lockout

Threshold

VIN rising

VIN falling

3.6 4.0 4.4

V

3.5 3.9 4.3

OUT Bias Current

VOUT = 5.5V

2

3.5

5

µA

IFB

FB Bias Current

VFB = 1.3V

-25

+25 nA

FB Threshold Low

50 100 150 mV

Thermal Shutdown

DC-DC Switches

10ºC hysteresis

145

ºC

tOFFMIN LX Switch Minimum Off-Time

0.2

0.4

0.6

µs

tONMAX LX Switch Maximum On-Time

VFB = 1.3V

8

10

12

µs

RLX

LX Switch On-Resistance

VIN = 6V

VIN = 4.5V

0.4 0.8

Ω

0.5 0.95

ILXPEAK

LX Current Limit

ILIMIT = GND, L = 39µH

ILIMIT = IN, L = 10µH

500 700 900

mA

1000 1400 1800

LX Zero-Crossing Threshold

-75

+75 mV

Zero-Crossing Timeout LX does not rise above the threshold

30

µs

LX Switch Leakage Current

Control Inputs

VIN = 20V, LX = GND, TAMB = +25ºC

VIN = 20V, LX = GND

0.1

µA

1

Digital Input Level

SHDNN, ILIMIT = GND

SHDNN, ILIMIT = IN

2.4

0.8

V

Digital Input Leakage Current VSHDNN, VILIMIT = 0 to 20V, VIN = 20V -100

Power-OK

+100 nA

Power-OK Threshold

Falling edge, relative to VOUT

90 92.5 95

%

POK Output Voltage Low

IPOK = 1mA

0.4

V

POK Output Leakage Current

VIN, VPOK = 16V, TAMB = 25°C

VIN, VPOK = 16V

0.1

µA

1

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