TPS65800RTQR datasheet(13/98 Pages) TI

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ELECTRICAL CHARACTERISTICS – SWITCHED MODE SM1 STEP DOWN CONVERTER

TPS65800

SLVS606C – SEPTEMBER 2005 – REVISED FEBRUARY 2007

Over recommended operating conditions (typical values at T

J = 25°C), VO(SM1) = 1.24 V, application circuit as in Figure 3

(unless otherwise noted).

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

IQ(SM1) = I(VIN_ SM1), no output load, not switching

IQ(SM1)

Quiescent current for SM1

µA

SM1 OFF, set via I2C

0.1

IO(SM1)

Output current range

600

Available output

voltages: VO(SM1)TYP =

Output voltage, selectable via I2C, standby OFF

0.6 V to 1.8 V,

adjustable in 40-mV

steps

Available output

voltages: VSBY(SM1) =

VO(SM1) = VSBY(SM1), output voltage range, standby ON

0.6 V to 1.8 V,

VO(SM1)

Output voltage, PWM mode

adjustable in 40-mV

steps

Total accuracy, VO(SM1)TYP = VSBY(SM1) = 1.24 V,

–3%

V(VIN_SM1) = 3 V to 4.7 V; 0 mA

≤ I

O(SM1)≤ 600 mA

Line regulation, V(VIN_SM1): 3

→ 4.7 V,

%/V

0.027

IO(SM1) = 10 mA

Load regulation, V(VIN_SM1) = 4.7 V,

0.139

%/A

IO(SM1): 60 mA → 540 mA

P-channel MOSFET

RDSON(PSM1)

V(VIN_SM1) = 3.6 V, 100% duty cycle set

310

500

Ω

on-resistance

ILKG(PSM1)

P-channel leakage current

0.1

µA

N-channel MOSFET

RDSON(NSM1)

V(VIN_SM1) = 3.6 V, 0% duty cycle set

220

330

Ω

on-resistance

ILKG(PSM1)

N-channel leakage current

µA

ILIM(SM1)

P- and N-channel current limit

3 V < V(VIN_SM1) < 4.7 V

900

1050

1200

fS(SM1)

Oscillator frequency

PWM mode set

1.3

1.5

1.7

MHz

V(VIN_SM1) = 4.2 V, PWM mode, IO(SM1) = 300 mA,

EFF(SM1)

Efficiency

90%

VO(SM1) = 3 V

Converter OFF

→ON, V

O(SM1): 5% → 95% of target

tSS(SM1)

Soft start ramp time

750

value

µs

GPIO1 pin programmed as SM1 converter enable

tDLY(SM1)

Converter turn-on delay

170

control. Measured from V(GPIO1): LO

→ HI

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