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LMZ22003 bảng dữ liệu(PDF) 3 Page - Texas Instruments

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LMZ22003 bảng dữ liệu(HTML) 3 Page - Texas Instruments

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PGND/EP
Connect to AGND
5
FB
6
SS/TRK
3
EN
1
VIN
2
SYNC
4
AGND
7
VOUT
LMZ22003
www.ti.com
SNVS658I – MARCH 2011 – REVISED AUGUST 2015
5 Pin Configuration and Functions
NDW Package
7-Pin
Top View
Pin Functions
PIN
TYPE
DESCRIPTION
NAME
NO.
Analog Ground — Reference point for all stated voltages. Must be externally connected to PGND
AGND
4
Ground
(EP).
Enable — Input to the precision enable comparator. Rising threshold is 1.279 V typical. Once the
EN
3
Analog
module is enabled, a 21-µA source current is internally activated to facilitate programmable
hysteresis.
Feedback — Internally connected to the regulation amplifier, overvoltage comparators. The
FB
5
Analog
regulation reference point is 0.796 V at this input pin. Connect the feedback resistor divider between
the output and AGND to set the output voltage.
Exposed Pad / Power Ground Electrical path for the power circuits within the module. — NOT
PGND
Ground
Internally connected to AGND / pin 4. Used to dissipate heat from the package during operation.
Must be electrically connected to pin 4 external to the package.
Soft-Start/Track — To extend the 1.6-ms internal soft-start connect an external soft-start capacitor.
SS/TRK
6
Analog
For tracking connect to an external resistive divider connected to a higher priority supply rail. See
Design Steps section
Sync Input — Apply a CMOS logic level square wave whose frequency is between 650 kHz and
950 kHz to synchronize the PWM operating frequency to an external frequency source. When not
SYNC
2
Analog
using synchronization connect to ground. The module free-running PWM frequency is 812 kHz
(typical).
Supply input — Nominal operating range is 6 V to 20 V. A small amount of internal capacitance is
VIN
1
Power
contained within the package assembly. Additional external input capacitance is required between
this pin and exposed pad (PGND).
Output Voltage — Output from the internal inductor. Connect the output capacitor between this pin
VOUT
7
Power
and exposed pad.
6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)
(1) (2) (3)
MIN
MAX
UNIT
VIN to PGND
–0.3
24
V
EN, SYNC to AGND
–0.3
5.5
V
SS/TRK, FB to AGND
–0.3
2.5
V
AGND to PGND
–0.3
0.3
V
Junction temperature
150
°C
Peak reflow case temperature (30 sec)
245
°C
Storage temperature, Tstg
–65
150
°C
(1)
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2)
If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and
specifications.
(3)
For soldering specifications, refer to the following document: SNOA549
Copyright © 2011–2015, Texas Instruments Incorporated
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3
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