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PDF LD7241 Data sheet ( Hoja de datos )
| Número de pieza | LD7241 | |
| Descripción | 5-Channel DC-DC Converter | |
| Fabricantes | Leadtrend | |
| Logotipo |  |
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LD7241
11/24/2008
5-Channel DC-DC Converter with 1 Channel Shutter Driver
REV :00
General Description
The LD7241 includes 5-channel PWM DC/DC controller IC
and a Shutter controller. It can operate at 1MHz frequency
and built in ON/OFF control, soft-start, power on/off
sequence and output overload protection.
Four channels have been integrated with MOSFETs and
can achieve higher efficiency up to 90%~95% (CH1, CH2,
CH3 and CH4). CH5 is a current source, ideally for 1WLED
driver application. The LD7241 is also built with
constant-current shutter driver. It optimizes overall efficiency
and cost, and also reduces the board size.
The LD7241 is available in a space-saving 5mm*5mm
40-pin QFN package.
+ Patented
Features
• 1.5V to 5V Battery Input Range
• All Power Switches Integrated
• All channels built with internal compensation
• Synchronous step-down Converter
- Efficiency up to 95%
- Duty Cycle up to 100%
• Synchronous Step-up Converter
- Efficiency up to 95%
- Output Overvoltage Protection
- Truly disconnected from output during shutdown
• 1 WLED Driver application
-1KHz~50KHz PWM dimming
• CH2 Buck or Boost Configuration Selection
• Built-in Charge pump to enhance CH3/CH4 PMOS gate
driving capacity
• Built-in Constant Current Shutter Driver
• Fixed 1MHz Operating Frequency
• Shutdown current :2.5μA (typ)
Applications
• Digital Video Camera, Digital Still Camera
1
Leadtrend Technology Corporation www.leadtrend.com.tw
LD7241-DS-00 November 2008
1 page  
LD7241
PIN NAME
FUNCTION
CH2 is configured as a step-up converter and PV2 is the output. (U/D=VBAT)
24 PV2 CH2 is configured as a step-down converter and PV2 is the input. (U/D=GND),
Bypass to PGND with a 1μF ceramic capacitor.
Input power of IC. Bypass to SGND with at least a 1μF ceramic capacitor.
25 VCC
Connect PV1 with VCC together.
26 PV1 CH1 Converter Output.
27 PV1 CH1 Converter Output.
28 LX1 CH1 Converter Switching Node. Pin 28 and 29 should be connected together.
29 LX1 CH1 Converter Switching Node. Pin 28 and 29 should be connected together.
Combine with SEL1 and SEL2 to determine the power sequence mode or debug
30 SEL0
mode of CH1, CH2, CH3 and CH4. Logic state isn’t changeable during operation
Combine with SEL0 and SEL2 to determine the power sequence mode or debug
31 SEL1
mode of CH1, CH2, CH3 and CH4. Logic state isn’t changeable during operation
Combine with SEL0 and SEL1 to determine the power sequence mode or debug
32 SEL2
mode of CH1, CH2, CH3 and CH4. Logic state isn’t changeable during operation.
Configure CH2 as a Step-up or Step-down Converter. Logic state isn’t changeable
during operation.
If U/D is connected to VBAT, CH2 is configured as step up and PV2 as the
33 U/D
converter output.
If U/D is connected to GND, CH2 is configured as step down and PV2 as the
converter input.
34 LX3 CH3 Converter Switching Node
35 IN3 CH3 Converter Input. Bypass to PGND with a 1μF ceramic capacitor.
36 IN4 CH4 Converter Input. Bypass to PGND with a 1μF ceramic capacitor.
37 LX4 LX4 Converter Switching Node. Pin 37 and 38 should be connected together.
38 LX4 LX4 Converter Switching Node. Pin 37 and 38 should be connected together.
39
CPO
Negative Output pin of charge pump
40 CN Charge pump external driver pin
Power GND (Exposed Metal Pad). Exposed pad should be soldered to PCB board
EP PGND
with a larger area and connected to SGND by a single point.
Leadtrend Technology Corporation
LD7241-DS-00 November 2008
5
www.leadtrend.com.tw
5 Page 
LD7241
PARAMETER
CH 5 WLED Driver
Input Voltage
Feedback Reference
Dropout Voltage
CONDITIONS
ILOAD =20mA@Vgs=3.6V
Output Current Limit
PWM Dimming Frequency
CH 6 Shutter Driver
VM power supply
VM supply current at stand by INA=INB=0, No load, VM=3.6V
Output On resistance
Io=200mA,
Sum of Resistance@ Vcc=3.3V
SENSE pin voltage
Output current
RSENSE=1.2Ω, VSENSE=0.264V
Protection
PV1and PV2 overvoltage
protection
VBAT Pin overvoltage
protection
VBAT Pin overvoltage
detection blanking time
Thermal Shutdown
Note 1: The IC is powered from VCC pin.
MIN TYP MAX UNITS
0.25
-
40
1
-
0.264
0.1
70
5.5
0.278
0.15
50
V
V
V
mA
KHz
2.5
0.5
1.5
0.264
209 220
5.5
2
231
V
μA
Ω
V
mA
6.0 6.2 6.5
V
6.0 6.2 6.5
V
2 mS
150 °C
Leadtrend Technology Corporation
LD7241-DS-00 November 2008
11
www.leadtrend.com.tw
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet LD7241.PDF ] | |
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