LP3907-Q1 Datasheet, PDF (8/53 Pages) Texas Instruments – Dual High-Current Step-Down DC-DC And Dual Linear Regulator

LP3907-Q1
SNVSA55A – DECEMBER 2014 – REVISED MAY 2015
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Low Dropout Regulators, LDO1 And LDO2 (continued)
Unless otherwise noted, V_IN = 3.6 V, C_IN = 1 µF, C_OUT = 0.47 µF, and T_J = 25°C. ^{(1)(2)(3)(4)(5)(6)(7)}
PARAMETER
TEST CONDITIONS
MIN
ΔV_OUT
I_SC
V_IN – V_OUT
Line regulation
Load regulation
Short circuit current limit
Dropout voltage
V_IN = (V_OUT + 0.3 V) to 5 V,
(7)_{, load current = 1 mA}
V_IN = 3.6 V,
Load current = 1 mA to I_MAX
LDO1-2, V_OUT = 0 V
Load current = 50 mA
(5)
TYP
MAX
0.15 ⁽⁹⁾
UNIT
%/V
0.011⁽⁹⁾ %/mA
500
mA
30 200⁽⁹⁾ mV
PSRR
θn
I_Q ^{(6) (10)}
T_ON
C_OUT
Power supply ripple rejection
Supply output noise
Quiescent current “on”
Quiescent current “on”
Quiescent current “off”
Turnon time
Output capacitor
ƒ = 10 kHz, load current = I_MAX
10 Hz < F < 100 KHz
I_OUT = 0 mA
I_OUT = I_MAX
EN is de-asserted⁽¹¹⁾
Start-up from shutdown
Capacitance for stability
0°C ≤ T_J ≤ 125°C
−40°C ≤ T_J ≤ 125°C
ESR
0.33 ⁽⁹⁾
0.68
5 ⁽⁹⁾
45
dB
80
µVrms
40
µA
60
µA
0.03
µA
300
µs
0.47
µF
1
µF
500⁽⁹⁾ mΩ
(10) The I_Q can be defined as the standing current of the LP3907-Q1 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-Q1 is powered using a battery.
(11) The I_Q exhibits a higher current draw when the EN pin is de-asserted because the I²C buffer pins draw an additional 2 µA.
7.7 Buck Converters SW1, SW2
Unless otherwise noted, V_IN = 3.6 V, C_IN = 10 µF, C_OUT = 10 µF, L_OUT = 2.2 µH ceramic, and T_J = 25°C. ^{(1)(2)(3)(4)(5)(6)}
PARAMETER
TEST CONDITIONS
MIN
TYP MAX
V_FB
Feedback voltage
–3% ⁽⁷⁾
3% ⁽⁷⁾
V_OUT
Line regulation
Load regulation
2.8 V < V_IN < 5.5 V
I_OUT = 10 mA
100 mA < I_OUT < I_MAX
0.089
0.0013
Eff
Efficiency
Load current = 250 mA
96%
UNIT
%/V
%/mA
I_SHDN
f_OSC
I_PEAK
I_Q ⁽⁸⁾
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
Turnon time
Input capacitor
Output capacitor
EN is de-asserted
No load PFM mode
Start up from shutdown
Capacitance for stability
Capacitance for stability
1.7 ⁽⁷⁾
10
10
0.01
2.1
1.5
1
33
200
180
500
µA
MHz
A
µA
mΩ
mΩ
µs
µF
µF
(1) All voltages are with respect to the potential at the GND pin.
(2) Minimum (Min) and Maximum (Max) limits are ensured by design, test, or statistical analysis. Typical numbers are not ensured, 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 + 1 V.
(7) Limits apply over the entire junction temperature range for operation, −40°C to 125°C.
(8) The I_Q can be defined as the standing current of the LP3907-Q1 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 device is powered using a battery.
8
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