LP3907_14 Datasheet, PDF (11/57 Pages) Texas Instruments – Dual High-Current Step-Down DC/DC and Dual Linear Regulator with I2C-Compatible Interface

LP3907
www.ti.com
SNVS511N – JUNE 2007 – REVISED AUGUST 2011
Buck Converters SW1, SW2
Unless otherwise noted, V_IN = 3.6V, C_IN = 10µF, C_OUT = 10µF, L_OUT = 2.2µH 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) (6)}
Symbol
Parameter
Conditions
Min
Typ
Max Units
V_FB
V_OUT
Eff
Feedback Voltage
Line Regulation
Load Regulation
Efficiency
2.8< V_IN < 5.5
I_O =10mA
100mA < I_O < I_MAX
Load Current = 250mA
−3
+3
%
0.089
%/V
0.0013
96
%/mA
%
I_SHDN
f_OSC
I_PEAK
I_Q ⁽⁷⁾
R_DSON (P)
R_DSON (N)
T_ON
C_IN
C_O
Shutdown Supply Current
Internal Oscillator Frequency
Buck1 Peak Switching Current Limit
Buck2 Peak Switching Current Limit
Quiescent Current “On”
Pin-Pin Resistance PFET
Pin-Pin Resistance NFET
Turn On Time
Input Capacitor
Output Capacitor
EN is de-asserted
No load PFM Mode
Start up from shut-down
Capacitance for stability
Capacitance for stability
0.01
1.7
2.1
1.5
1.0
33
200
180
500
10
10
µA
MHz
A
µA
mΩ
mΩ
µs
µF
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) 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) Quiescent current is defined here as the difference in current between the input voltage source and the load at V_OUT.
(6) Buck V_IN ≥ V_OUT + 1V.
(7) The I_Q can be defined as the standing current of the LP3907 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 LP3907 is powered using a battery.
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