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PDF LD7129 Data sheet ( Hoja de datos )
| Número de pieza | LD7129 | |
| Descripción | Single Synchronous Buck PWM and Linear Power Controller | |
| Fabricantes | Leadtrend | |
| Logotipo |  |
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LD7129
8/27/2004
Single Synchronous Buck PWM and Linear Power Controller
General Description
The LD7129 consists of the dual-output power controller and
the protection circuits in a single SOP-14 packaged chip for
the graphic card and other applications. The dual-output
power controller provides the regulation on a synchronous
rectified buck converter by driving 2 N-MOSFETs and one
N-MOSFET in a linear configuration.
The synchronous rectified buck converter provides simple,
single feedback loop, voltage mode control with fast
transient response. Internal 0.8V temperature-compensated
reference voltage. A fixed 600KHz frequency oscillator
reduces design complexity, while balancing typical
application cost and efficiency.
The internal soft-start function and the 12V direct drive on
switching output helps to eliminate the bootstrap circuit.
Furthermore, the internal POR (power on reset) help to
prevent the system from the sequence issue during the
startup and turn-off. Considering the fault conditions, the
LD7129 will shutdown both outputs when the voltage on
either FB or FB2 pin drop below 51% of the nominal value.
Features
• Controller Operates from 5V and 12V
• Drive Two N-channel MOSFETs for Switching Buck
Converter
• Drive a N-channel MOSFET on Linear Output
• Fixed 600KHz Constant Switching Frequency
• Full Range 0~100% Duty-cycle
• Internal Soft-start
• Fast Transient Response
• UVP Monitoring on Both Outputs
• Internal 0.8V Reference Voltage.
Applications
• Graphics-GPU and Memory Supplies
• ASIC Power Supplies
• Embedded Processor and I/O Supplies
• Cable Modem, Set Top Box, and DSL Modems
• DSP and Core Communications Processor Supplies
Typical Application
Vin (3.3V or 5V)
Q3
Vout
5V
12V
5VCC
12VCC
DRIVE2
FB2
Linear
Controller
Vref
Control
Logic
Shutdown
FB
Comp
Error Amp
OSC
GND
UGATE
Q1
LGATE
PGND
Q2
Leadtrend Technology Corporation
LD7129-DS-02 August 2004
1
Vout
1 page  
PARAMETER
Linear Regulator Error Amplifier
DC gain
Gain Bandwidth Product
Slew Rate
FB2 Input Bias Current
DRIVE2 High Output Voltage
DRIVE2 High Output Current
DRIVE2 Low Output Voltage
DRIVE2 Low Output Current
Linear Regulator Protection
Under-voltage Level (VFB2/VREF)
Over-voltage Level (VFB2/VREF)
CONDITIONS
LD7129
MIN
TYP
MAX UNITS
70 dB
10 MHz
6 V/µS
20 150 nA
12 V
-14 mA
0 0.5
V
14 mA
51 %
161 %
Leadtrend Technology Corporation
LD7129-DS-02 August 2004
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet LD7129.PDF ] | |
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