LP3905SD-A3EV National Semiconductor, LP3905SD-A3EV Datasheet - Page 5

• Manufacturer Part Number: LP3905SD-A3EV
• Description: BOARD EVALUATION LP3905SD-A3
• Manufacturer: National Semiconductor

Specifications of LP3905SD-A3EV

• Main Purpose: DC/DC, Step Down with LDO
• Outputs And Type: 4, Non-Isolated
• Voltage - Output: 1.5V, 1.85V, 2.8V, 3V
• Current - Output: 600mA, 600mA, 100mA, 100mA
• Voltage - Input: 3 ~ 5.5V
• Regulator Topology: Buck
• Frequency - Switching: 2MHz
• Board Type: Fully Populated
• Utilized Ic / Part: LP3905
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

V
V
R
R
I
F
η
∆V
I
V
I
I
PSRR
e
LIM
LOAD
SC
OUT
OSC
FB
OUT
DSON (P)
DSON (N)
n
General Electrical Characteristics
DO
Symbol
Buck Regulator Electrical Characteristics
Buck 1 & 2 have a current rating of I
(Buck1)
type apply over the full junction temperature range (−40˚C ≤ T
LP3905 Typical Application Circuit (Figure. 1) (Notes 2, 8)
Symbol
LDO Regulator Electrical Characteristics
The linear regulators have a current rating of I
Unless otherwise specified, limits are set with V
standard typeface are for T
+125˚C). Unless otherwise noted, specifications apply to the LP3905 Typical Application Circuit (Figure. 1)(Notes 2, 8)
OUT
= Vnom1 , V
Feedback Voltage
Line Regulation
Load Regulation
Pin-Pin Resistance for PFET
Pin-Pin Resistance for NFET
Switch Peak Current Limit
Internal Oscillator Frequency
Efficiency
Output Voltage Tolerance
Line Regulation Error
Load Regulation Error
Load Current
Dropout Voltage
Short Circuit Current Limit
Maximum Output Current
Power Supply Rejection Ratio
(Note 15)
Output Noise Voltage
(Note 15)
OUT(Buck2)
Parameter
Parameter
J
= Vnom2 and C
= 25˚C. Limits in boldface type apply over the full junction temperature range (−40˚C ≤ T
max
= 600mA. Unless otherwise specified, limits are set with V
IN
= C
max
IN
(Note 16)
3.0V ≤ V
I
100 mA ≤ I
V
V
Open Loop
PWM Mode
IOUT = 5mA, PFM mode (Note 15)
IOUT = 300mA, PWM mode (Note 15)
= 150mA with C
OUT
O
= 3.8V, V
Over Full Line and Load Regulation
V
I
I
(Notes 11, 15)
I
(Note 13)
C
f = 100Hz, I
f = 1kHz, I
f = 10kHz, I
f = 50kHz, I
f = 100kHz, I
BW = 10Hz to
100kHz, V
Buck1 Turned ON
with I
Buck2 Turned OFF
IN
IN
OUT
OUT
OUT
IN
= 1mA
OUT
= V
= V
=10µF. Limits in standard typeface are for T
= 3.8V to 5.5V,
= 1mA
= 1 mA to 100mA
= 100mA
LOAD
GS
GS
(Notes 2, 8, 9) (Continued)
= 1.0µF
IN
= 3.6V
= 3.6V (Note 15)
EN1/2
O
≤ 5.5V
= 0mA,
IN
OUT
J
OUT
OUT
OUT
≤ 600mA
5
= 4.2V
OUT
≤ +125˚C). Unless otherwise noted, specifications apply to the
Condition
Conditions
= 3.8V, C
= 100mA
OUT
= 100mA
= 100mA
= 100mA
= 100mA
= 1.0µF. A 100mA rating applies with C
I
I
IN
OUT
OUT
= 1µF, C
= 1mA
= 100mA
OUT
= 0.47µF, I
Min
650
88
90
-4
Min
150
−3
0
J
IN
= 25˚C. Limits in boldface
= V
0.045
0.002
1000
OUT
Typ
380
250
0.003
0.05
13.5
15.5
2
Typ
300
80
90
90
60
35
25
EN1/2
= 1.0mA. Limits in
= 3.8V, V
OUT
1220
Max
500
400
+4
Max
150
500
= 0.47µF.
3
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J
OUT -
≤
%/mA
Units
MHz
%/V
µV
mΩ
mΩ
mA
%/mA
Units
%
%
%/V
mA
mV
mA
mA
dB
%
RMS