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MCP1662

High-Voltage Step-Up LED Driver



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MCP1662 pdf
MCP1662
High-Voltage Step-Up LED Driver with UVLO and Open Load Protection
Features
• 36V, 800 mIntegrated 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 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.
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
MCP1662
SOT-23
SW 1
GND 2
VFB 3
5 VIN
4 EN
MCP1662
2x3 TDFN*
VFB 1
8 EN
SGND 2 EP 7 PGND
SW 3 9 6 NC
NC 4
5 VIN
* Includes Exposed Thermal Pad (EP); see
Table 3-1.
2014-2015 Microchip Technology Inc.
DS20005316E-page 1



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MCP1662 pdf
MCP1662
Typical Application
VIN
2.4V – 3.0V
CIN
4.7 – 30 µF
+
-
ON
+ OFF
L
4.7 – 10 µH
D
MBR0540
SW
VIN
MCP1662
EN
ILED
= 0.3V
RSET
LED1
LED2
LED6
VFB VFB = 0.3V
GND
ILED = 25 mA
RSET
12
VOUT
COUT
10 µF
-
L = 4.7 µH for maximum 4 white LEDs
L = 10 µH for 5 to 10 white LEDs
CIN = 4.7-10 µF for VIN > 2.5V
CIN = 20-30 µF for VIN < 2.5V
Maximum LED Current in Regulation vs. Input Voltage, TA = + 25°C
250
200 4 wLEDs, L = 4.7 µH
150
8 wLEDs, L = 10 µH
100
50
0
2 2.5 3 3.5 4 4.5 5 5.5
VIN (V)
DS20005316E-page 2
2014-2015 Microchip Technology Inc.



Part Number MCP1662
Description High-Voltage Step-Up LED Driver
Maker Microchip - Microchip
Total Page 28 Pages
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