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FAN5308

800mA High-Efficiency Step-Down DC-DC Converter

Fairchild Semiconductor 

Electrical Characteristics

VIN = VOUT + 0.6V (minimum 2.5V) to 5.5V, IOUT = 350mA, VOUT =1.2V, EN = VIN, TA = -40°C to +85°C, unless other-

wise noted. Typical values are at TA = 25°C.

Symbol

Parameter

Conditions

Min. Typ. Max. Units

VIN Input Voltage

IQ Quiescent Current

0 mA ≤ IOUT ≤ 800 mA

IOUT = 0mA, Device is not switching

IOUT = 0mA, Device R2 =10kΩ

is switching(4)

R2 =100kΩ

ISD

VUVLO

Shutdown Supply Current

Under-Voltage Lockout

Threshold

EN = GND

VIN Rising

Hysteresis

VENH

VENL

IEN

RDS-ON

ILIM

fOSC

Ilkg_(N)

Ilkg_(P)

VREF

Enable High Input Voltage

Enable Low Input Voltage

EN Input Bias Current

PMOS On Resistance

NMOS On Resistance

P-channel Current Limit

Oscillator Frequency

EN = VIN or GND

VIN = VGS = 5.5V

VIN = VGS = 2.5V

VIN = VGS = 5.5V

VIN = VGS = 2.5V

2.5V < VIN < 5.5V

N-Channel Leakage Current VDS = 5.5V

P-Channel Leakage Current VDS = 5.5V

Line Regulation

IOUT = 10mA

Load Regulation

350mA ≤ IOUT ≤ 800mA

Reference Voltage

Output DC Voltage

Accuracy(5)

0mA ≤ IOUT ≤ 800mA

Over-Temperature

Protection

PWM Mode Only

350mA ≤ IOUT ≤

800mA

Rising

Temperature

Hysteresis

tST Start-Up Time

IOUT = 800mA, COUT = 20µF

2.5

1.9

1.3

1300

1000

-3

20

50

25

0.1

2.1

150

0.01

250

300

200

250

1500

1300

0.1

0.1

0.16

0.15

0.8

150

20

800

5.5

V

35

µA

µA

µA

1.0

µA

2.3

V

mV

V

0.4

V

0.10

µA

350

mΩ

400

300

mΩ

350

2000 mA

1500 KHz

1

µA

1

µA

%/V

%

V

+3

%

°C

°C

µs

Notes:

4. Refer to the Application section for details.

5. For output voltages ≤ 1.2V, a 40µF output capacitor value is required to achieve a maximum output accuracy of 3%

while operating in power-save mode (PFM mode).

© 2005 Fairchild Semiconductor Corporation

FAN5308 Rev. 1.0.2

4

www.fairchildsemi.com

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