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MCP1662T-E/MN PDF预览

MCP1662T-E/MN

更新时间: 2024-11-17 01:12:59
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美国微芯 - MICROCHIP /
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28页 614K
描述
High-Voltage Step-Up LED Driver with UVLO and Open Load Protection

MCP1662T-E/MN 数据手册

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MCP1662  
High-Voltage Step-Up LED Driver with UVLO and Open Load Protection  
Features  
General Description  
• 36V, 800 mIntegrated Switch  
• Up to 92% Efficiency  
The MCP1662 device is a compact, space-efficient,  
fixed-frequency, non-synchronous step-up converter  
optimized to drive LED strings with constant current  
from a two- or three-cell alkaline or lithium Energizer®,  
or NiMH/NiCd, or one-cell Lithium-Ion or Li-Polymer  
batteries.  
• Drive LED Strings in Constant Current  
• 1.3A Peak Input Current Limit:  
- ILED up to 200 mA @ 5.0V VIN, 4 White LEDs  
- ILED up to 125 mA @ 3.3V VIN, 4 White LEDs  
- ILED up to 100 mA @ 4.2V VIN, 8 White LEDs  
• Input Voltage Range: 2.4V to 5.5V  
• Feedback Voltage Reference: VFB = 300 mV  
• Undervoltage Lockout (UVLO):  
The device integrates a 36V, 800 mlow-side switch,  
which is protected by the 1.3A cycle-by-cycle inductor  
peak current limit operation. All compensation and pro-  
tection circuitry is integrated to minimize the number of  
external components.  
The internal feedback (VFB) voltage is set to 300 mV for  
low power dissipation when sensing and regulating the  
LED current. A single resistor sets the LED current.  
- UVLO @ VIN Rising: 2.3V, typical  
- UVLO @ VIN Falling: 1.85V, typical  
• Sleep Mode with 20 nA Typical Quiescent Current  
• PWM Operation: 500 kHz Switching Frequency  
• Cycle-by-Cycle Current Limiting  
The device features an Undervoltage Lockout (UVLO)  
that avoids start-up with low inputs or discharged bat-  
teries for two-cell-powered applications.  
• Internal Compensation  
There is an open load protection (OLP) which turns off  
the operation in situations when the LED string is acci-  
dentally disconnected or the feedback pin is short-cir-  
cuited to GND.  
• Open Load Protection (OLP) in the Event of:  
- Feedback pin shorted to GND (prevent  
excessive current into LEDs)  
- Disconnected LED string (prevent overvoltage  
to the converter’s Output and SW pin)  
For standby applications (EN = GND), the device stops  
switching, enters into Sleep mode and consumes  
20 nA typical of input current.  
• Overtemperature Protection  
• Available Packages:  
- 5-Lead SOT-23  
Package Types  
- 8-Lead 2x3 TDFN  
MCP1662  
SOT-23  
Applications  
• Two and Three-Cell Alkaline or NiMH/NiCd White  
LED Driver for Backlighting Products  
SW  
GND  
VFB  
VIN  
EN  
1
2
3
5
4
• Li-Ion Battery LED Lighting Application  
• Camera Flash  
• LED Flashlights and Backlight Current Source  
• Medical Equipment  
MCP1662  
2x3 TDFN*  
• Portable Devices:  
VFB  
EN  
- Handheld Gaming Devices  
- GPS Navigation Systems  
- LCD Monitors  
1
8
PGND  
2
3
4
7
6
5
S
EP  
9
GND  
SW  
NC  
VIN  
- Portable DVD Players  
NC  
* Includes Exposed Thermal Pad (EP); see  
Table 3-1.  
2014-2015 Microchip Technology Inc.  
DS20005316E-page 1  

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