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MCP1661

High-Voltage Integrated Switch PWM Boost Regulator


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MCP1661 pdf
MCP1661
High-Voltage Integrated Switch PWM Boost Regulator with UVLO
Features
• 36V, 800 mIntegrated Switch
• Up to 92% Efficiency
• High Output Voltage Range: up to 32V
• 1.3A Peak Input Current Limit:
- IOUT > 200 mA @ 5.0V VIN, 12V VOUT
- IOUT > 125 mA @ 3.3V VIN, 12V VOUT
- IOUT > 100 mA @ 4.2V VIN, 24V VOUT
• Input Voltage Range: 2.4V to 5.5V
• Undervoltage Lockout (UVLO):
- UVLO @ VIN Rising: 2.3V, typical
- UVLO @ VIN Falling: 1.85V, typical
• No Load Input Current: 250 µA, typical
• Sleep mode with 200 nA Typical Quiescent
Current
• PWM Operation with Skip mode: 500 kHz
• Feedback Voltage Reference: VFB = 1.227V
• Cycle-by-Cycle Current Limiting
• Internal Compensation
• Inrush Current Limiting and Internal Soft Start
• Output Overvoltage Protection (OVP) in the event
of:
- Feedback pin shorted to GND
- Disconnected feedback divider
• Overtemperature Protection
• Easily Configurable for SEPIC or Flyback
Topologies
• Available Packages:
- 5-Lead SOT-23
- 8-Lead 2x3 TDFN
Applications
• Two and Three-Cell Alkaline, Lithium Ultimate and
NiMH/NiCd Portable Products
• Single-Cell Li-Ion to 5V, 12V or 24V Converters
• LCD Bias Supply for Portable Applications
• Camera Phone Flash
• Portable Medical Equipment
• Hand-Held Instruments
• Single-Cell Li-Ion to 3.0V or 3.3V SEPIC
Applications (see Figure 6-3)
General Description
The MCP1661 device is a compact, high-efficiency,
fixed-frequency, non-synchronous step-up DC-DC
converter which integrates a 36V, 800 mNMOS
switch. It provides a space-efficient high-voltage
step-up power supply solution for applications powered
by either two-cell or three-cell alkaline, Ultimate Lithium,
NiCd, NiMH, one-cell Li-Ion or Li-Polymer batteries.
The integrated switch is protected by the 1.3A
cycle-by-cycle inductor peak current limit operation.
There is an output overvoltage protection which turns
off switching in case the feedback resistors are
accidentally disconnected or the feedback pin is
short-circuited to GND.
Low-voltage technology allows the regulator to start-up
without high inrush current or output voltage overshoot
from a low-voltage input. The device features a UVLO
which avoids start-up and operation with low inputs or
discharged batteries for two cell-powered applications.
For standby applications (EN = GND), the device stops
switching, enters Sleep mode and consumes 200 nA
(typical) of input current.
MCP1661 is easy to use and allows creating classic
boost, SEPIC or flyback DC-DC converters within a
small Printed Circuit Board (PCB) area. All
compensation and protection circuitry is integrated to
minimize the number of external components. Ceramic
input and output capacitors are used.
Package Types
MCP1661
SOT-23
SW 1
GND 2
VFB 3
5 VIN
4 EN
MCP1661
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.
DS20005315B-page 1



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MCP1661 pdf
MCP1661
Typical Applications
V IN
2.4V -3.0V
+
C IN
4.7-10 μF
-
ON
+ OFF
L
4.7 μH
D
PMEG2005
V OUT
12V, 75 mA-125 mA
SW
V IN
MCP1661
V FB
EN GND
VFB = 1.227V
R TOP
1.05 M Ω
R BOT
120 k Ω
C OUT
4.7-10 μF
-
V IN
3.0V - 4.2V
+
C IN
10 μF
-
+
L
10 μH
D
MBR0540
V OUT
24V, 50 mA-125 mA
SW
V IN
MCP1661
V FB
EN GND
R TOP
1.05 MΩ
R BOT
56 kΩ
C OUT
10 μF
-
DS20005315B-page 2
300
250
VOUT = 12V
200
150
100
VOUT = 24V
50
0
2.4 2.8 3.2 3.6 4 4.4
VIN (V)
Maximum Output Current vs. VIN
4.8
2014-2015 Microchip Technology Inc.



Part Number MCP1661
Description High-Voltage Integrated Switch PWM Boost Regulator
Maker Microchip - Microchip
Total Page 30 Pages
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