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PDF L6726A Data sheet ( Hoja de datos )
| Número de pieza | L6726A | |
| Descripción | Single phase PWM controller | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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L6726A
Single phase PWM controller
Feature
■ Flexible power supply from 5V to 12V
■ Power conversion input as low as 1.5V
■ 1% output voltage accuracy
■ High-current integrated drivers
■ Adjustable output voltage
■ 0.8V internal reference
■ Sensorless and programmable OCP across
Low-side RdsON
■ Oscillator internally fixed at 270kHz
■ Programmable soft-start
■ LS-LESS start up
■ Disable function
■ FB disconnection protection
■ SO-8 package
Applications
■ Subsystem power supply (MCH, IOCH, PCI...)
■ Memory and termination Supply
■ CPU & DSP power supply
■ Distributed power supply
■ General DC / DC converters
SO-8
Description
L6726A is a single-phase step-down controller
with integrated high-current drivers that provides
complete control logic, protections and reference
voltage to realize in an easy and simple way
general DC-DC converters by using a compact
SO-8 package.
Device flexibility allows managing conversions
with power input VIN as low as 1.5V and device
supply voltage ranging from 5V to 12V.
L6726A provides simple control loop with trans-
conductance error amplifier. The integrated 0.8V
reference allows regulating output voltage with
±1% accuracy over line and temperature
variations. Oscillator is internally fixed to 270kHz.
L6726A provides programmable over current
protection. Current information is monitored
across the Low-Side mosfet RdsON saving the use
of expensive and space-consuming sense
resistors.
FB disconnection protection prevents excessive
and dangerous output voltages in case of floating
FB pin.
Order codes
Part Number
L6726A
L6726ATR
Package
SO-8
SO-8
Packing
Tube
Tape & Reel
October 2006
Rev 2
1/24
www.st.com
24
1 page  
L6726A
Pins description and connection diagrams
www.DataSheet4U.com
2 Pins description and connection diagrams
Figure 3. Pins connection (Top View)
BOOT
UGATE
GND
LGATE / OC
18
27
3 L6726A 6
45
PHASE
COMP / DIS
FB
VCC
2.1
Pin descriptions
Table 1. Pins descriptions
Pin #
Name
Function
HS Driver Supply.
1 BOOT Connect through a capacitor (100nF) to the floating node (LS-Drain) pin
and provide necessary bootstrap diode from VCC.
2 UGATE HS Driver Output. Connect to HS mosfet gate.
All internal references, logic and drivers are connected to this pin.
3 GND
Connect to the PCB ground plane.
LGATE. LS Driver Output. Connect to LS mosfet gate.
OC. Over Current threshold set. During a short period of time following
VCC rising over UVLO threshold, a 10µA current is sourced from this pin.
Connect to GND with an ROCSET resistor greater than 5kΩ to program OC
4 LGATE / OC Threshold. The resulting voltage at this pin is sampled and held internally
as the OC set point. Maximum programmable OC threshold is 0.55V. A
voltage greater than 0.75V (max) activates an internal clamp and causes
OC threshold to be set at 375mV. ROCSET not connected sets the 375mV
default threshold.
Device and LS Driver power supply.
5 VCC
Operative range from 4.1V to 13.2V. Filter with at least 1µF MLCC to GND.
Error Amplifier Inverting Input.
6 FB Connect with a resistor RFB to the output regulated voltage. Additional
resistor ROS to GND may be used to regulate voltages higher than the
reference.
COMP. Error Amplifier Output. Connect with an RF - CF // CP to GND to
compensate the device control loop in conjunction to the FB pin.
7
COMP / DIS
During the Soft-Start phase, a 10µA current is sourced from this pin so the
compensation capacitors also act to program the SS time.
DIS. The device can be disabled by pulling this pin lower than 0.4V (min).
Setting free the pin, the device enables again.
HS Driver return path, current-reading and adaptive-dead-time monitor.
8
PHASE
Connect to the LS drain to sense RdsON drop to measure the output
current. This pin is also used by the adaptive-dead-time control circuitry to
monitor when HS mosfet is OFF.
5/24
5 Page 
L6726A
Driver section
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External gate resistors helps the device to dissipate the switching power since the same
power PSW will be shared between the internal driver impedance and the external resistor
resulting in a general cooling of the device.
Figure 4. Soft start (left) and Disable (right)
11/24
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| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet L6726A.PDF ] | |
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