Datasheet

LP3906
www.ti.com SNVS456M –AUGUST 2006–REVISED MAY 2013
BUCK CONVERTERS SW1, SW2
Unless otherwise noted, V
IN
= 3.6, C
IN
= 10 µF, C
OUT
= 10 µF, L
OUT
= 2.2 µH ceramic. Typical values and limits appearing in
normal type apply for T
J
= 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)
Parameter Test Conditions Min Typ Max Units
V
OUT
Output Voltage Accuracy Default V
OUT
−3 +3 %
Line Regulation 2.7< V
IN
< 5.5 0.089 %/V
I
O
=10 mA
Load Regulation 100 mA < I
O
< I
MAX
0.0013 %/mA
Eff Efficiency Load Current = 250 mA 96 %
I
SHDN
Shutdown Supply Current EN is de-asserted 0.01 µA
f
OSC
Sync Mode Clock Frequency Synchronized from 13 MHz system 2.0 MHz
clock
Internal Oscillator Frequency 2.0 MHz
I
PEAK
Peak Switching Current Limit 2.0 A
I
Q
(5)
Quiescent Current “On” No load PFM Mode 33 µA
R
DSON
(P) Pin-Pin Resistance PFET 200 mΩ
R
DSON
(N) Pin-Pin Resistance NFET 180 mΩ
T
ON
Turn On Time Start up from shut-down 500 µs
C
IN
Input Capacitor Capacitance for stability 10 µF
C
O
Output Capacitor Capacitance for stability 10 µF
(1) All voltages are with respect to the potential at the GND pin.
(2) Min and Max limits are ensured by design, test, or statistical analysis. Typical numbers are not specifications, but do represent the most
likely norm.
(3) C
IN
, C
OUT
: 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) The Iq can be defined as the standing current of the LP3906 when the I2C 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 LP3906 is powered using a battery. If the user plans to use the HW enable pins to
disable each block of the IC please contact the factory applications for IQ details.
I/O ELECTRICAL CHARACTERISTICS
Unless otherwise noted: Typical values and limits appearing in normal type apply for T
J
= 25°C. Limits appearing in boldface
type apply over the entire junction temperature range for operation, T
J
= 0°C to +125°C.
(1)
Limit
Parameter Test Conditions Units
Min Max
V
IL
Input Low Level 0.4 V
V
IH
Input High Level 1.2 V
(1) This specification is ensured by design.
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