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LM3370 Datasheet(Fiches technique) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Numéro de pièce LM3370
Description  Dual Synchronous Step-Down DC-DC Converter with Dynamic Voltage Scaling Function
Télécharger  23 Pages
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
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Absolute Maximum Ratings (Notes 1,
2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
V
IN1 ,VIN2 VDD to PGND &
SGND
−0.2V to 6V
PGND to SGND
-0.2V to +0.2V
SDA, SCL, EN, EN2, nPOR1,
nPOR2, SW1, SW2, FB1 &
FB2
(GND - 0.2) to (V
IN +
0.2V)
Maximum Continuous Power
Dissipation (P
D_MAX) (Note 3)
Internally Limited
Junction Temperature (T
J-MAX)
125˚C
Storage Temperature Range
−65˚C to +150˚C
Maximum Lead Temperature
(Soldering)
(Note 4)
ESD Ratings (Note 5)
All Pins
2 kV HBM
200V MM
Operating Ratings (Notes 1, 2)
Input Voltage Range ((Note 10))
2.7V to 5.5V
Recommended Load Current Per Channel
0mA to 600mA
Junction Temperature (T
J) Range
−30˚C to +125˚C
Ambient Temperature (T
A) Range (Note 6)
−30˚C to +85˚C
Thermal Properties (Note 7)
Junction-to-Ambient Thermal Resistance
(
θ
JA)
26˚C/W
Electrical Characteristics (Notes 2, 8, 10)Typical limits appearing in normal type apply for T
J = 25˚C. Lim-
its appearing in boldface type apply over the entire junction temperature range (T
A =TJ = −30˚C to +85˚C). Unless otherwise
noted, V
IN1 =VIN2 = 3.6V.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
FB
Feedback Voltage
(Note 11)
-3.5
+3.5
%
V
OUT
Line Regulation
2.7V
≤ V
IN
≤ 5.5V
I
O = 10mA, VOUT = 1.8V
0.031
%/V
Load Regulation
100mA
≤ I
O
≤ 600mA
V
IN = 3.6V, VOUT = 1.8V
0.0013
%/mA
I
Q PFM
Quiescient Current “On”
PFM Mode, Both Bucks ON
34
µA
I
Q SD
Quiescient Current “Off”
EN1 = EN2 = 0V
0.2
3
µA
I
LIM
Peak Switching Current Limit
V
IN = 3.6V
850
1200
1400
mA
R
DS_ON
PFET
V
IN = 3.6V, ISW = 200mA
390
500
m
NFET
V
IN = 3.6V, ISW = 200mA
240
350
F
OSC
Internal Oscillator Frequency
1.5
2.0
2.4
MHz
I
EN
Enable (EN) Input Current
0.01
1
µA
V
IL
Enable Logic Low
0.4
V
V
IH
Enable Logic High
1.0
V
POWER ON RESET THRESHOLD/FUNCTION (POR)
nPOR1 &
nPOR2
Delay Time
nPOR1 = Power ON Reset
for Buck 1
50 mS (default)
50
mS
nPOR2 = Power ON Reset
for Buck 2
Can be pre-trimmd to 50 uS, 100
mS & 200 mS
POR
Threshold
Percentage of Target V
OUT
V
OUT Rising
94
%
V
OUT Falling, 85% (default), Can
be pre-trimmed to 70% or 94%
85
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device
is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the Electrical
Characteristics tables.
Note 2: All voltages are with respect to the potential at the GND pin.
Note 3: Internal thermal shutdown circuitry protects the device from permanent damage. The thermal shutdown engages at TJ = 150˚C (typ.) and disengages at
TJ = 140˚C(typ.).
Note 4: For detailed soldering specifications and information, please refer to National Semiconductor Application Note 1187: Leadless Leadframe Package (LLP)
(AN-1187).
Note 5: The Human body model is a 100 pF capacitor discharged through a 1.5 k
Ω resistor into each pin. (MIL-STD-883 3015.7) The machine model is a 200 pF
capacitor discharged directly into each pin. (EAIJ)
www.national.com
5




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