L6728DTR Fast Delivery |IC PHOENIX CO.,LIMITED

L6728DTR ,Single phase PWM controller with Power GoodElectrical characteristics . . . . . . . 75 Device description . . 96 Driver section ..
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LC4064V-75TN100I , 3.3V/2.5V/1.8V In-System Programmable SuperFAST High Density PLDs
LC4064V-75TN44C , 3.3V/2.5V/1.8V In-System Programmable SuperFAST High Density PLDs

L6728DTR
Single phase PWM controller with Power Good

February 2010 Doc ID 16498 Rev 1 1/33
L6728D
Single-phase PWM controller with Power Good
Features Flexible power supply from 5 V to 12 V Power conversion input as low as 1.5 V 0.8 V internal reference 0.8% output voltage accuracy High-current integrated drivers Power Good output Sensorless and programmable OCP across
low-side RDS(on) OV / UV protection VSEN disconnection protection Oscillator internally fixed at 300 kHz LSLess to manage pre-bias startup Adjustable output voltage Disable function Internal soft-start DFN10 package
Applications Memory and termination supply Subsystem power supply (MCH, IOCH, PCI,
etc.) CPU and DSP power supply Distributed power supply General DC-DC converters
Description
L6728D is a single-phase step-down controller
with integrated high-current drivers that provides
complete control logic and protection to simplify
the design of general DC-DC converters by using
a compact DFN10 package.
Device flexibility allows the management of
conversions with power input (VIN ) as low as
1.5 V, and device supply voltage ranging from 5 V
to 12 V.
The L6728D provides a simple control loop with
voltage mode EA. The integrated 0.8 V reference
allows output voltages regulation with ±0.8%
accuracy over line and temperature variations.
The oscillator is internally fixed to 300 kHz.
The L6728D provides programmable dual level
overcurrent protection, as well as overvoltage and
undervoltage protection. Current information is
monitored across the low-side MOSFET R DS(on),
eliminating the need for expensive and space-
consuming sense resistors.
A PGOOD output easily provides real-time
information on output voltage status, through the
VSEN dedicated output monitor.
Table 1. Device summary

Contents L6728D
2/33 Doc ID 16498 Rev 1
Contents Typical application circuit and block diagram . . . . . . . . . . . . . . . . . . . . 4
1.1 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Pin description and connection diagram . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Device description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Driver section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6.1 Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Soft-start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7.1 Low-side-less startup (LSLess) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Overcurrent protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
8.1 Overcurrent threshold setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Output voltage setting and protections . . . . . . . . . . . . . . . . . . . . . . . . 15 Application details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
10.1 Compensation network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
10.2 Layout guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
11.1 Inductor design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
11.2 Output capacitor(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
11.3 Input capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
L6728D Contents
Doc ID 16498 Rev 1 3/33
20 A demonstration board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
12.1 Board description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
12.1.1 Power input (Vin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
12.1.2 Output (Vout) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
12.1.3 Signal input (Vcc) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
12.1.4 Test points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
12.1.5 Board characterization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 5 A demonstration board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
13.1 Board description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
13.1.1 Power input (Vin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
13.1.2 Output (Vout) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
13.1.3 Signal input (Vcc) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
13.1.4 Test points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
13.1.5 Board characterization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Typical application circuit and block diagram L6728D
4/33 Doc ID 16498 Rev 1 Typical application circuit and block diagram
1.1 Application circuit
1.2 Block diagram
Figure 2. Block diagram of the L6728D
L6728D Pin description and connection diagram
Doc ID 16498 Rev 1 5/33
Pin description and connection diagram

2.1 Pin descriptions

Figure 3. Pin connection (top view)
Table 2. Pins description

Partno	Mfg	Dc	Qty	Available	Descript
L6728DTR	ST	N/a	633	avai	Single phase PWM controller with Power Good