LM3370 datasheet(7/33 Pages) TI1

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LM3370

www.ti.com

SNVS406M – NOVEMBER 2005 – REVISED AUGUST 2011

ELECTRICAL CHARACTERISTICS

(1) (2) (3)Typical limits appearing in normal type apply for T

J = 25°C. Limits appearing in boldface type apply over the entire

junction temperature range (TA = TJ = −30°C to +85°C). Unless otherwise noted, VIN1 = VIN2 = 3.6V.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

VFB

Feedback Voltage

(4)

−3.5

+3.5

VOUT

Line Regulation

2.7V

≤ VIN ≤ 5.5V

0.031

%/V

IO = 10 mA, VOUT = 1.8V

Load Regulation

100 mA

≤ IO ≤ 600 mA

0.0013

%/mA

VIN = 3.6V, VOUT = 1.8V

IQ PFM

Quiescent Current “On”

PFM Mode, Both Bucks ON

µA

IQ SD

Quiescent Current “Off”

EN1 = EN2 = 0V

0.2

µA

ILIM

Peak Switching Current Limit

VIN = 3.6V

850

1200

1400

RDS_ON

PFET

VIN = 3.6V, ISW = 200 mA

390

500

Ω

(LLP)

NFET

VIN = 3.6V, ISW = 200 mA

240

350

RDS_ON

PFET

VIN = 3.6V, ISW = 200 mA

350

400

Ω

(micro SMD)

NFET

VIN = 3.6V, ISW = 200 mA

170

210

FOSC

Internal Oscillator Frequency

1.5

2.0

2.4

MHz

IEN

Enable (EN) Input Current

0.01

µA

VIL

Enable Logic Low

0.4

VIH

Enable Logic High

1.0

POWER ON RESET THRESHOLD/FUNCTION (POR)

nPOR1 &

nPOR1 = Power ON Reset

50 mS (default)

nPOR2

for Buck 1

Delay Time

nPOR2 = Power ON Reset

Can be pre-trimmd to 50 uS, 100

for Buck 2

mS & 200 mS

POR

Percentage of Target VOUT

VOUT Rising

Threshold

VOUT Falling, 85% (default), Can be

pre-trimmed to 70% or 94%

(1)

All voltages are with respect to the potential at the GND pin.

(2)

Min. and Max are guaranteed by design, test and/or statistical analysis. All electrical characteristics having room-temperature limits are

tested during production with TJ = 25°C. All hot and cold limits are guaranteed by correlating the electrical characteristics to process and

temperature variations and applying statistical process control.

(3)

Input voltage range for all voltage options is 2.7V to 5.5V. The voltage range recommended for the specified output voltages: VIN = 2.7V

to 5.5V for 1V

≤ VOUT ≤ 1.7V and for VOUT = 1.8V or greater, VIN = VOUT + 1VorVIN,MIN = ILOAD * (RDSON_PFET + RDCR_INDUCTOR) + VOUT

(4)

Test condition: for VOUT less than 2.5V, VIN = 3.6V; for VOUT greater than or equal to 2.5V, VIN = VOUT + 1V.

DISSIPATION RATING TABLE

θJA

TA = 60°C

TA = 85°C

Power Rating

26°C/W (4-Layer Board) LLP-16

1538 mW

50°C/W (4-Layer Board) 20-bump micro SMD

1300 mW

800 mW

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