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LM3370 Datasheet(Fiches technique) 4 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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 4 page
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Pin Descriptions
Pin #
Name
Description
1V
IN2
Main Battery Power Input for Buck 2
2
SW2
Buck 2 Switch Pin
3
PGND2
Buck 2 Power Ground
4V
DD
Analog and Digital V
DD Battery Input
5
SGND
Analog GND
6
PGND1
Buck 1 Power Ground
7
SW1
Buck 1 Switch Pin
8V
IN1
Main Battery Power Input for Buck 1
9
FB1
Analog Feedback Input for Buck 1
10
SDA
I
2C Compatible Data,a2k
Ω pull up resistor is required.
11
SCL
I
2C Compatible Clock,a2k
Ω pull up resistor is required.
12
nPOR1
Power ON Reset for Buck 1, Open drain output Low when Buck 1 output is 92% of
target output. A 100 k
Ω pull up resistor is required
13
nPOR2
Power ON Reset for Buck 2, Open drain output Low when Buck 2 output is 92% of
target output. A 100 k
Ω pull up resistor is required
14
EN1
Buck 1 Enable
15
EN2
Buck 2 Enable
16
FB2
Analog feedback for Buck 2
I
2C Controlled Features
Features
Parameter
Comments
Output Voltage
V
OUT1 &VOUT2
Output voltage is controlled via I
2C compatible
Modes
Buck 1 & Buck 2
Mode can be controlled via I
2C
compatible by either forcing device
in Auto mode or forced PWM mode
Spread Spectrum
Buck 1 & Buck 2
Spread Spectrum capability via I
2C compatible for noise reduction
Ordering Information
Order Number
Voltage Option
Package Marking
Supplied As
LM3370SD-3013*
1.2V & 2.5V
250 units, Tape-and-Reel
LM3370SDX-3013*
3000 units, Tape and Reel
LM3370SD-3021
1.2V & 3.3V
S0003TB
250 units, Tape-and-Reel
LM3370SDX-3021
S0003TB
3000 units, Tape-and-Reel
LM3370SD-3416*
1.4V & 2.8V
250 units, Tape-and-Reel
LM3370SDX-3416*
3000 units, Tape-and-Reel
LM3370SD-4221*
1.8V & 3.3V
250 units, Tape-and-Reel
LM3370SDX-4221*
3000 units, Tape-and-Reel
Note the LM3370SD-3013 has the following default output voltages where V
OUT1 =1.2V&VOUT2 = 2.5V
* Contact National Semiconductor for availability
www.national.com
4




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