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PDF LD7242 Data sheet ( Hoja de datos )
| Número de pieza | LD7242 | |
| Descripción | Highly-Integrated 6-Channel DC/DC Power Management IC | |
| Fabricantes | Leadtrend | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LD7242 (archivo pdf) en la parte inferior de esta página. Total 25 Páginas | ||
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LD7242
3/5/2012
Highly-Integrated 6-Channel DC/DC Power Management IC
REV：02
General Description
The LD7242 is a high-efficiency complete solution for
power supply of digital video cameras (DVCs). With six
internal MOSFET DC-DC converters, it provides a
maximum efficiency of 95% and generates all the critical
power suppliers in DV systems. The LD7242 includes 6
channels of converter and 3 LDOs and Power-Good flag.
See the description as below.
6 Channel DC/DC Converters:
CH1 is a synchronous boost converter for motor control
and HDMI.
CH2 is a selectable synchronous buck/boost converter for
DSC system I/O power.
CH3 is a synchronous buck converter for DSP core or
external memory.
CH4 is a synchronous buck converter for DSP core or
external memory.
CH5 is a selectable high-voltage boost converter/ current
source for white LEDs display.
CH6 is an asynchronous boost converter for micro
projector power.
LDOs：
LDO25 is a LDO regulator with ultra-low noise, high
PSRR and soft start function for PLL.
HVLDO is a high voltage input LDO regulator with
ultra-low noise, high PSRR and soft start function for
HDMI.
RTC_LDO is LDO regulator with low quiescent current
and high output voltage accuracy for Real Time Clock.
The LD7242 also features internal compensation to
minimize external component count. For the complete
protection, the LD7242 provides over current protection,
over/under voltage protection, and thermal shutdown
protection.
The LD7242 can operate in 1-cell lithium-ion (Li+) or
dual-battery (2AA) designs. It is available in a compact
32-Pin, 4mm x 4 mm WQFN package.
+Patented
Features
‧ Supply Voltage Range：1.5V to 5.5V
‧ Integrated Power MOSFET Switch
‧ Synchronous Buck Converter
-Up to 95% Efficiency
-Up to 100% Duty Cycle
‧ Synchronous Boost Converter
- Up to 95% Efficiency
- All Boost Converters with OVP
-True Shutdown function
‧ Built-in with CH1, CH2, CH3, CH4 and LDO25 Power
ON/OFF Sequence Control Pin
‧ Boost Mode LED Driver for WLED
-PWM Dimming
-LED Open Protection
-Regulated Current for up to 5 White LEDs
‧ Current Source Mode LED Driver for WLED
-PWM Dimming
-Up to 25mA Output Current
‧ Built-in RTC LDO , HVLDO(100mA), LDO25(300mA)
and System Power-Good flag
‧ Fixed 1MHz Operating Frequency with CH1 to CH6
‧ Operating Ambient Temperature Range: -30C to
85C
Applications
‧ Digital Video Cameras (DVCs)
‧ Portable Electronic Equipment
Leadtrend Technology Corporation
LD7242-DS-02 March 2012
1
www.leadtrend.com.tw
1 page  
LD7242
Timing Diagram：A7 (SEQ1=1, SEQ2=1)
Power On Sequence：CH1 Boost CH4 Buck CH2 Buck LDO25 CH3 Buck
Power Off Sequence：CH3 Buck LDO25 CH2 Buck CH4 Buck CH1 Boost
Timing Diagram
CH6 Timing Diagram
Leadtrend Technology Corporation
LD7242-DS-02 March 2012
5
www.leadtrend.com.tw
5 Page 
Electrical Characteristics
(TA = +25C, VDD=3.3V unless otherwise stated)
PARAMETER
CONDITIONS
Input Power
Operating Voltage VBAT
VBAT Over Voltage Protection
VBAT Over Voltage Protection
De-bounce Time
Operating Voltage VDD
Supply Current
VDD Shutdown Current,
All PON=0
VBAT Shutdown Current
All PON=0
CH1 (Syn-Boost) Supply
Current into VDD, IQ1
Non Switching,
SEQ1≠L, SEQ2≠L
CH2 (Syn-Boost or Syn-Buck)
Supply Current into VDD, IQ2
Non Switching,
SEQ1≠L, SEQ2≠L
CH3 (Syn-Buck) Supply
Current into VDD, IQ3
Non Switching,
SEQ1≠L, SEQ2≠L
CH4 (Syn-Buck) Supply
Current into VDD, IQ4
Non Switching,
SEQ1≠L, SEQ2≠L
CH5 (WLED) in Boost Mode： Non Switching,
Supply Current into VDD, IQ5-BL PON5=H
VOUT5=1.0V
CH5 (WLED) in Current
Source Mode：Supply Current
into VDD, IQ5-CS
Non Switching,
PON5=H
VOUT5=0V
CH6 (Asyn-Boost) Supply
Current into VDD, IQ6
Internal Oscillator
Non Switching, PON6=H
CH1 to CH6 Operating
Frequency, fs
Maximum Duty Cycle
CH1 (Boost)
CH2 (Boost)
CH2 (Buck)
CH3 (Buck)
CH4 (Buck)
VFB1=0.75V
VFB1=0.75V
VFB2=0.75V
VFB3=0.75V
VFB4=0.75V
Leadtrend Technology Corporation
LD7242-DS-02 March 2012
11
www.leadtrend.com.tw
LD7242
MIN TYP MAX UNITS
1.5 5.5 V
5.75 6.25 6.75 V
2 ms
2.7 5.5 V
1 5 A
6.5 11.5 A
800 A
800 A
800 A
800 A
800 A
600 A
800 A
0.9 1.0 1.1 MHz
90 93 96 %
90 93 96 %
100 %
100 %
100 %
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet LD7242.PDF ] | |
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