L5970D_07 STMICROELECTRONICS [STMicroelectronics], L5970D_07 Datasheet

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L5970D_07

Manufacturer Part Number
L5970D_07
Description
Up to 1A step down switching regulator
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet
General features
Applications
Test application circuit
January 2007
Up to 1A output current
Operating input voltage from 4.4V to 36V
3.3V / (±2%) reference voltage
Output voltage adjustable from 1.2V to 35V
Low dropout operation: 100% duty cycle
250KHz Internally fixed frequency
Voltage feedforward
Zero load current operation
Internal current limiting
Inhibit for zero current consumption
Synchronization
Protection against feedback disconnection
Thermal shutdown
Consumer: STB, DVD, TV, VCR, car radio,
LCD monitors
Networking: XDSL, modems, DC-DC modules
Computer: printers, audio/graphic cards,
optical storage, hard disk drive
Industrial: changers, car battery, DC-DC
converters
CERAMIC
VIN = 4.4V to 35V
10µF
35V
C1
220pF
3.3V
22nF
C4
C3
SYNC.
COMP
VREF
VCC
4.7K
R3
6
8
2
4
INH.
Up to 1A step down switching regulator
L5970D
3
Rev 14
7
GND
Description
The L5970D is a step down monolithic power
switching regulator capable to deliver up to 1A at
output voltages from 1.2V to 35V.
The device uses an internal P-Channel D-MOS
transistor (with a typical Rdson of 250mΩ) as
switching element to minimize the size of the
external components.
An internal oscillator fixes the switching frequency
at 250KHz.
Having a minimum input voltage of 4.4V only, it is
particularly suitable for 5V bus, available in all
computer related applications.
Pulse by pulse current limit with the internal
frequency modulation offers an effective constant
current short circuit protection.
D98IN954C
1
5
OUT
FB
STPS2L40U
L1 33µH
D1
SO8
5.6K
3.3K
R1
R2
VOUT=3.3V
L5970D
100µF
10V
C2
www.st.com
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L5970D_07 Summary of contents

Page 1

General features ■ output current ■ Operating input voltage from 4.4V to 36V ■ 3.3V / (±2%) reference voltage ■ Output voltage adjustable from 1.2V to 35V ■ Low dropout operation: 100% duty cycle ■ 250KHz Internally ...

Page 2

Contents Contents 1 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

Page 3

L5970D 1 Pin settings 1.1 Pin connection Figure 1. Pin connection (top view) 1.2 Pin description Table 1. Pin description N° Type 1 OUT 2 SYNC 3 INH 4 COMP VREF 7 GND 8 VCC OUT 1 ...

Page 4

Electrical data 2 Electrical data 2.1 Maximum ratings Table 2. Absolute maximum ratings Symbol V Input voltage 8 V Output DC voltage 1 Output peak voltage 0.1µs I Maximum output current Analog pins ...

Page 5

L5970D 3 Electrical characteristics Table 4. Electrical characteristics ( T Symbol Operating input V CC voltage range Mosfet on R DS(on) Resistance Maximum limiting I l current f Switching frequency s Duty cycle Dynamic characteristics (see test circuit ). V ...

Page 6

Electrical characteristics Table 4. Electrical characteristics ( T Symbol I Source bias current b DC open loop gain gm Transconductance Sync function High input voltage Low input voltage Slave sink current Master output amplitude Output pulse width Reference section Reference ...

Page 7

L5970D 4 Typical characteristics Figure 2. Junction temperature vs. output current Tj(°C) 130 120 110 100 Vcc=5V 90 Tamb=25° 0.2 0.4 0.6 Figure 4. Junction temperature vs. output current Tj(°C) 130 120 110 ...

Page 8

Typical characteristics Figure 8. Quiescent current vs. junction temperature Iq (mA) 2 1.8 1.6 Vcc = 12V 1.4 1.2 -50 0 Figure 10. Shutdown current vs.junction temperature Ishd (µ Vcc = 12V ...

Page 9

L5970D 5 Application circuit Figure 13. Demo board application circuit VIN = 4.4V to 25V C1 10µF 25V CERAMIC Table 5. Component list Reference VREF 3.3V 6 VCC 8 L5970D SYNC. ...

Page 10

Application circuit Figure 14. PCB layout (component side) Figure 15. PCB layout (bottom side) Figure 16. PCB layout (front side) 10/16 42mm 34mm L5970D ...

Page 11

L5970D 6 Application ideas Figure 17. Dual output voltage with auxiliary winding VIN=12V C1 10uF C2 25V 220pF Ceramic Figure 18. Buck-boost regulator VIN=12V C1 C2 10uF 10uF 25V 35V Ceramic Ceramic Vin=12V Vout=-12V Iout=0.5A Efficiency=81% Figure 19. Positive Buck-Boost ...

Page 12

Package mechanical data 7 Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a Lead-free second level interconnect . The category of second level interconnect is marked on the package ...

Page 13

L5970D Table 6. MSOP8 Mechanical data Dim ( ( aaa 1. D and F does not include mold flash or protrusions. Mold flash or potrusions shall not exceed ...

Page 14

Order code 8 Order code Table 7. Order code Part number L5970D L5970D013TR 14/16 Package Packaging SO8 SO8 Tape and reel L5970D Tube ...

Page 15

L5970D 9 Revision history Table 8. Revision history Date 26-Jan-2007 Revision 14 Updated Table 5 on page 9 Revision history Changes 15/16 ...

Page 16

Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any ...

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