LP3907 datasheet(11/57 Pages) TI1

11 / 57 page

LP3907

www.ti.com

SNVS511N – JUNE 2007 – REVISED AUGUST 2011

Buck Converters SW1, SW2

Unless otherwise noted, VIN = 3.6V, CIN = 10µF, COUT = 10µF, LOUT = 2.2µH ceramic. Typical values and limits appearing in

normal type apply for TJ = 25°C. Limits appearing in boldface type apply over the entire junction temperature range for

operation,

−40°C to +125°C.

(1) (2) (3) (4) (5) (6)

Symbol

Parameter

Conditions

Min

Typ

Max

Units

VFB

Feedback Voltage

−3

VOUT

Line Regulation

2.8< VIN < 5.5

0.089

%/V

IO =10mA

Load Regulation

100mA < IO < IMAX

0.0013

%/mA

Eff

Efficiency

Load Current = 250mA

ISHDN

Shutdown Supply Current

EN is de-asserted

0.01

µA

fOSC

Internal Oscillator Frequency

1.7

2.1

MHz

IPEAK

Buck1 Peak Switching Current Limit

1.5

Buck2 Peak Switching Current Limit

1.0

(7)

Quiescent Current “On”

No load PFM Mode

µA

RDSON (P)

Pin-Pin Resistance PFET

200

Ω

RDSON (N)

Pin-Pin Resistance NFET

180

Ω

TON

Turn On Time

Start up from shut-down

500

µs

CIN

Input Capacitor

Capacitance for stability

µF

Output Capacitor

Capacitance for stability

µF

(1)

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

(2)

Min and Max limits are guaranteed by design, test, or statistical analysis. Typical numbers are not guaranteed, but do represent the

most likely norm.

(3)

CIN, COUT: Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics.

(4)

The device maintains a stable, regulated output voltage without a load.

(5)

Quiescent current is defined here as the difference in current between the input voltage source and the load at VOUT.

(6)

Buck VIN ≥ VOUT + 1V.

(7)

The IQ can be defined as the standing current of the LP3907 when the I

2C bus is active and all other power blocks have been disabled

via the I2C bus, or it can be defined as the I2C bus active, and the other power blocks are active under no load condition. These two

values can be used by the system designer when the LP3907 is powered using a battery.

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