Instrukcja obsługi Microchip MCP1662

Microchip nieskategoryzowany 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
MCP1662
DS20005316E-page 2 2014-2015 Microchip Technology Inc.
Typical Application
VIN
GND
VFB
COUT
10 µF
CIN
4.7 – 30 µF
L
4.7 – 10 µH
SW
EN
+
-
ALKALINE
ON
OFF
MCP1662
+
-
ALAKLINE
VIN
2.4V – 3.0V
LED6
12
RSET
LED1
ILED = 25 mA
ILED =0.3V
RSET
LED2
VFB = 0.3V
Maximum LED Current in Regulation vs. Input Voltage, TA= + 25°C
VOUT
0
50
100
150
200
250
2 2.5 3 3.5 4 4.5 5 5.5
(mA)
V
IN
(V)
4wLEDs, L = 4.7 µH
8 wLEDs, L = 10 µH
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
D
MBR0540
ILED
2014-2015 Microchip Technology Inc. DS20005316E-page 3
MCP1662
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings †
VSW – GND.....................................................................+36V
EN, VIN – GND...............................................................+6.0V
VFB ...............................................................................+0.35V
Power Dissipation .......................................Internally Limited
Storage Temperature .................................... -65
°C to +150°C
Ambient Temperature with Power Applied .... -40 °C to +125°C
Operating Junction Temperature................... -40°C to +150°C
ESD Protection on All Pins:
HBM.................................................................4 kV
MM ..................................................................300V
† Notice: Stresses above those listed under “Maximum
Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of
the device at those or any other conditions above those
indicated in the operational sections of this specifica-
tion is not intended. Exposure to maximum rating con-
ditions for extended periods may affect device
reliability.
DC AND AC CHARACTERISTICS
Electrical Specifications: Unless otherwise specified, all limits apply for typical values at ambient temperature
TA= +25°C, VIN = 3.3V, VOUT = 9V or 3 white LEDs (VF= 2.75V @ IF= 20 mA or VF= 3.1V @ IF= 100 mA),
ILED = 20 mA, CIN = COUT = 10 µF, X7R ceramic, L = 4.7 µH.
Boldface specifications apply over the controlled T
A range of -40°C to +125°C.
Parameters Sym. Min. Typ. Max. Units Conditions
Input Voltage Range VIN 2.4 — 5.5 V Note 1
Undervoltage Lockout (UVLO) UVLO
START — 2.3 — V VIN rising, ILED = 20 mA
UVLOSTOP — 1.85 — V VIN falling, ILED = 20 mA
Maximum Output Voltage VOUTmax — — 32 V
Maximum Output Current IOUT — 100 — mA 4.2V VIN, 8 LEDs
125 — mA 3.3V VIN, 4 LEDs
200 — mA 5.0V VIN, 4 LEDs
Feedback Voltage Reference VFB 275 300 325 mV
Feedback Open Load
Protection (OLP) Threshold
VFB_OLP — 50 — mV VFB falling (Note 2)
Feedback Input Bias Current I
VFB — 0.005 — µA
Shutdown Quiescent Current IQSHDN — 0.02 — µA EN = GND
NMOS Peak Switch Current
Limit
IN(MAX) — 1.3 — A Note 2
NMOS Switch Leakage INLK — 0.4 — µA VIN = VSW = 5V;
VOUT = 5.5V
VEN = VFB = GND
NMOS Switch ON Resistance RDS(ON) — 0.8 — VIN = 5V,
ILED = 100 mA,
4 series white LEDs
( )
Note 2
Feedback Voltage
Line Regulation
|(VFB/VFB )/VIN| — 0.25 — %/V VIN = 3.0V to 5V
Maximum Duty Cycle DCMAX — 90 — % Note 2
Switching Frequency fSW 425 575500 kHz ±15%
EN Input Logic High V
IH 85 — — % of VIN
Note 1: Minimum input voltage in the range of VIN
(VIN < 5.5V < VOUT) depends on the maximum duty cycle
(DCMAX) and on the output voltage (VOUT
), according to the boost converter equation:
VINmin = VOUT x (1 – DCMAX). Output voltage is equal to the LED voltage plus the voltage on the sense
resistor (VOUT = VLED + V_RSET).
2: Determined by characterization, not production tested.

Specyfikacje produktu

Marka: Microchip
Kategoria: nieskategoryzowany
Model: MCP1662

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