Instrukcja obsługi Microchip MCP1662


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2014-2015 Microchip Technology Inc. DS20005316E-page 1
MCP1662
Features
36V, 800 m Integrated Switch
Up to 92% Efficiency
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):
- 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
Internal Compensation
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)
Overtemperature Protection
Available Packages:
- 5-Lead SOT-23
- 8-Lead 2x3 TDFN
Applications
Two and Three-Cell Alkaline or NiMH/NiCd White
LED Driver for Backlighting Products
Li-Ion Battery LED Lighting Application
Camera Flash
LED Flashlights and Backlight Current Source
Medical Equipment
Portable Devices:
- Handheld Gaming Devices
- GPS Navigation Systems
- LCD Monitors
- Portable DVD Players
General Description
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.
The device integrates a 36V, 800 m low-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.
The device features an Undervoltage Lockout (UVLO)
that avoids start-up with low inputs or discharged bat-
teries for two-cell-powered applications.
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.
For standby applications (EN = GND), the device stops
switching, enters into Sleep mode and consumes
20 nA typical of input current.
Package Types
* Includes Exposed Thermal Pad (EP); see
Table 3-1.
MCP1662
SOT-23
MCP1662
2x3 TDFN*
VFB
GND
EN
1
2
3
5
4
VIN
SW
SW
S
GND
NC
PGND
NC
1
2
3
4
8
7
6
5
V
IN
ENVFB
EP
9
High-Voltage Step-Up LED Driver with UVLO and Open Load Protection


Specyfikacje produktu

Marka: Microchip
Kategoria: nieskategoryzowany
Model: MCP1662

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