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L6728 데이터시트 PDF




STMicroelectronics에서 제조한 전자 부품 L6728은 전자 산업 및 응용 분야에서
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부품번호 L6728 기능
기능 Single phase PWM controller
제조업체 STMicroelectronics
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L6728 데이터시트, 핀배열, 회로
www.DataSheet4U.com
L6728
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 protections
VSEN disconnection protection
Oscillator internally fixed at 300 kHz
LSless to manage pre-bias start-up
Adjustable output voltage
Disable function
Internal soft-start
DFN10 package
Applications
Memory and termination supply
Subsystem power supply (MCH, IOCH, PCI...)
CPU and DSP power supply
Distributed power supply
General DC-DC converters
DFN10
Description
L6728 is a single-phase step-down controller with
integrated high-current drivers that provides
complete control logic and protection to realize in
a simple way general DC-DC converters by using
a compact DFN10 package.
Device flexibility allows managing conversions
with power input VIN as low as 1.5 V and device
supply voltage ranging from 5 V to 12 V.
L6728 provides simple control loop with voltage
mode EA. The integrated 0.8 V reference allows
regulating output voltages with ±0.8 % accuracy
over line and temperature variations. Oscillator is
internally fixed to 300 kHz.
L6728 provides programmable dual level over
current protection as well as over and under
voltage protection. Current information is
monitored across the low-side MOSFET RDS(on)
saving the use of expensive and space-
consuming sense resistors.
PGOOD output easily provides real-time
information on output voltage status, through
VSEN dedicated output monitor.
Table 1.
Device summary
Order codes
L6728
L6728TR
Package
DFN10
Packaging
Tube
Tape and reel
June 2008
Rev 3
1/31
www.st.com
1




L6728 pdf, 반도체, 판매, 대치품
Typical application circuit and block diagram
www.DataSheet4U.com
1 Typical application circuit and block diagram
L6728
1.1
Application circuit
Figure 1. Typical application circuit
VCC = 5V to 12V
CDEC
PGOOD
CF
CP RF
ROS
RPG
10
6
VCC
PGOOD
BOOT
7
COMP
/ DIS
UGATE
PHASE
1
3
2
4
8 LGATE
FB / OC
VSEN GND
RFB
9
5 ROCSET
VIN = 1.5V to 12V
CHF
HS
L
LS
CBULK
Vout
COUT
LOAD
1.2
ROS
L6728 Reference Schematic
RFB
Block diagram
Figure 2. Block diagram
VSEN
VOUT MONITOR
PGOOD
CONTROL LOGIC
&
PROTECTIONS
OC
CLOCK
300 kHz
OSCILLATOR
L6728
PWM
ERROR AMPLIFIER
+
-
0.8V
VOCTH
HS
VCC
LS
IOCSET
BOOT
UGATE
PHASE
LGATE
/ OC
GND
4/31

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L6728 전자부품, 판매, 대치품
L6728
www.DataSheet4U.com
4 Electrical specifications
4.1
Absolute maximum ratings
Table 4. Absolute maximum ratings
Symbol
Parameter
VCC
to GND
VBOOT, VUGATE
to PHASE
to GND
to GND; t < 200 ns
VPHASE
to GND
to GND; t < 200 ns
VLGATE
to GND
FB, COMP, VSEN to GND
PGOOD to GND
Electrical specifications
Value
-0.3 to 15
15
33
45
-5 to 18
-8 to 30
-0.3 to VCC+0.3
-0.3 to 3.6
-0.3 to VCC+0.3
Unit
V
V
V
V
V
V
4.2 Electrical characteristics
Table 5.
Electrical characteristics
(VCC = 5 V to 12 V; TJ = 0 to 70 °C unless otherwise specified)
Symbol
Parameter
Test conditions
Min Typ Max Unit
Supply current and power-ON
ICC
IBOOT
UVLO
VCC supply current
BOOT supply current
VCC Turn-ON
Hysteresis
UGATE and LGATE = OPEN
UGATE = OPEN; PHASE to GND
VCC rising
6 mA
0.7 mA
4.1 V
0.2 V
Oscillator
FSW
VOSC
dMAX
Main oscillator accuracy
PWM ramp amplitude
Maximum duty cycle
Reference and error amplifier
270 300 330 kHz
1.4 V
80 %
A0
GBWP
SR
DIS
Output voltage accuracy
DC gain (1)
Gain-bandwidth product (1)
Slew-rate (1)
Disable threshold
COMP falling
-0.8 -
0.8 %
120 dB
15 MHz
8 V/µs
0.70 0.85 V
7/31

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