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L5973ADTR Datasheet

  • L5973ADTR

  • 2A SWITCH STEP DOWN SWITCHING REGULATOR

  • 14頁

  • STMICROELECTRONICS   STMICROELECTRONICS

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L5973AD
2A SWITCH STEP DOWN SWITCHING REGULATOR
1
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GENERAL FEATURES
2A INTERNAL SWITCH
OPERATING INPUT VOLTAGE FROM 4.4V TO 36V
3.3V / (鹵2%) REFERENCE VOLTAGE
OUTPUT VOLTAGE ADJUSTABLE FROM
1.235V TO 35V
LOW DROPOUT OPERATION: 100% DUTY
CYCLE
500KHz INTERNALLY FIXED FREQUENCY
VOLTAGE FEEDFORWARD
ZERO LOAD CURRENT OPERATION
INTERNAL CURRENT LIMITING
INHIBIT FOR ZERO CURRENT
CONSUMPTION
SYNCHRONIZATION
PROTECTION AGAINST FEEDBACK
DISCONNECTION
THERMAL SHUTDOWN
Figure 1. Package
HSOP8 (Exposed pad)
Table 1. Order Codes
Part Number
L5973AD
L5973ADTR
Package
HSOP8
HSOP8 in Tape & Reel
1.1 APPLICATIONS:
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CONSUMER: STB, DVD, TV, VCR,CAR
RADIO, LCD MONITORS
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NETWORKING: XDSL, MODEMS,DC-DC
MODULES
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COMPUTER: PRINTERS, AUDIO/GRAPHIC
CARDS, OPTICAL STORAGE, HARD DISK
DRIVE
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INDUSTRIAL: CHARGERS, CAR BATTERY
DC-DC CONVERTERS
switching regulator with a switch current limit of 2A so
it is able to deliver more than 1.5A DC current to the
load depending on the application conditions.
The output voltage can be set from 1.235V to 35V.
The high current level is also achieved thanks to an
SO8 package with exposed frame, that allows to re-
duce the R
th(j-amb)
down to approximately 40擄C/W
The device uses an internal P-Channel D-MOS tran-
sistor (with a typical of 200m鈩? as switching element
to avoid the use of bootstrap capacitor and guarantee
high efficiency.
An internal oscillator fixes the switching frequency at
500KHz to minimize the size of external components.
Having a minimum input voltage of 4.4V only, it is
particularly suitable for 5V bus, available in all com-
puter related applications.
Pulse by pulse current limit with the internal frequen-
cy modulation offers an effective constant current
short circuit protection.
2
DESCRIPTION
The L5973AD is a step down monolithic power
Figure 2. Test and Application Circuit
3.3V
VIN = 4.4V to 35V
VREF
VCC
SYNC.
C1
10碌F
35V
CERAMIC
COMP
C4
22nF
C3
220pF
R3
4.7K
6
8
2
4
INH
1
OUT
L1 15碌H
D1
STPS340U
VOUT=3.3V
L5973AD
3
7
5
FB
GND
R1
5.6K
C2
330碌F
10V
R2
3.3K
D03IN1453
December 2004
Rev. 3
1/14

L5973ADTR 產(chǎn)品屬性

  • STMicroelectronics

  • 開關(guān)變換器、穩(wěn)壓器與控制器

  • 1.235 V to 35 V

  • 2 A

  • 4 V to 36 V

  • 500 KHz

  • - 40 C to + 150 C

  • SMD/SMT

  • HSOP-8

  • Reel

  • 100 %

  • 2500

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