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  Microchip Technology Semiconductor Electronic Components Datasheet  


MCP16251

PFM/PWM Synchronous Boost Regulator



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MCP16251 pdf
MCP16251/2
Low Quiescent Current, PFM/PWM Synchronous Boost Regulator
with True Output Disconnect or Input/Output Bypass Option
Features
• Up to 96% Typical Efficiency
• 650 mA Typical Peak Input Current Limit:
- IOUT > 100 mA @ 3.3V VOUT, 1.2V VIN
- IOUT > 250 mA @ 3.3V VOUT, 2.4V VIN
- IOUT > 225 mA @ 5.0V VOUT, 3.3V VIN
• Low Device Quiescent Current:
- Output Quiescent Current: < 4 µA typical,
device is not switching (VOUT > VIN,
excluding feedback divider current)
- Input Sleep Current: 1 µA
- No Load Input Current: 14 µA typical
• Shutdown Current: 0.6 µA typical
• Low Start-Up Voltage: 0.82V, 1 mA load
• Low Operating Input Voltage: down to 0.35V
• Adjustable Output Voltage Range: 1.8V to 5.5V
• Maximum Input Voltage VOUT < 5.5V
• Automatic PFM/PWM Operation:
- PWM Operation: 500 kHz
- PFM Output Ripple: 150 mV typical
• Feedback Voltage: 1.23V
• Internal Synchronous Rectifier
• Internal Compensation
• Inrush Current Limiting and Internal Soft Start
(1.5 ms typical)
• Selectable, Logic Controlled, Shutdown States:
- True Load Disconnect Option (MCP16251)
- Input-to-Output Bypass Option (MCP16252)
• Anti-Ringing Control
• Overtemperature Protection
• Available Packages:
- SOT-23, 6-Lead
- TDFN, 2 x 3 x 0.8 mm, 8-Lead
Package Types
MCP16251/2
6-Lead SOT-23
MCP16251/2
2x3x0.8 TDFN*
SW 1
GND 2
EN 3
6 VIN VFB 1
8 VIN
5 VOUT SGND 2
4 VFB
PGND 3
EN 4
EP
9
7 VOUTS
6 VOUTP
5 SW
* Includes Exposed Thermal Pad (EP); see Table 3-1.
Applications
• One, Two and Three-Cell Alkaline and NiMH/NiCd
Portable Products
• Solar Cell Applications
• Personal Care and Medical Products
• Bias for Status LEDs
• Smartphones, MP3 Players, Digital Cameras
• Remote Controllers, Portable Instruments
• Wireless Sensors
• Bluetooth Headsets
• +3.3V to +5.0V Distributed Power Supply
General Description
The MCP16251/2 is a compact, high-efficiency, fixed
frequency, synchronous step-up DC-DC converter.
This family of devices provides an easy-to-use power
supply solution for applications powered by either
one-cell, two-cell or three-cell alkaline, NiCd, NiMH,
one-cell Li-Ion or Li-Polymer batteries.
Low-voltage technology allows the regulator to start-up
without high inrush current or output voltage overshoot
from a low-voltage input. High efficiency is
accomplished by integrating the low-resistance
N-Channel boost switch and synchronous P-Channel
switch. All compensation and protection circuitry are
integrated to minimize external components.
MCP16251/2 operates and consumes less than 14 µA
from battery after start-up, while operating at no load
(VOUT = 3.3V, VIN = 1.5V). The devices provide a true
disconnect from input to output (MCP16251) or an
input-to-output bypass (MCP16252), while in shutdown
(EN = GND). Both shutdown options consume less
than 0.6 µA from battery.
Output voltage is set by a small external resistor
divider. Two package options, SOT-23, 6-lead and
TDFN, 2 x 3 x 0.8 mm, 8-lead are available.
2013 - 2016 Microchip Technology Inc.
DS20005173B-page 1



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MCP16251 pdf
MCP16251/2
Typical Application
VIN
0.9V to 1.7V
+ CIN
4.7 µF
-
L
4.7 µH
SW
VIN
VOUT
EN VFB
GND
VOUT
3.3V / 75 mA
RTOP
1.69 M
RBOT
1 M
COUT
10 µF
VIN
3.0V to 4.2V
+ CIN
4.7 µF
-
L
4.7 µH
SW VOUTS
VIN VOUTP
EN VFB
PGND SGND
VOUT
5.0V / 200 mA
RTOP
3.09 M
RBOT
1 M
COUT
10 µF
100
95
90
85
80
75
70
65
60
55
50
0.1
VIN = 3.0V
VIN = 1.5V VIN = 2.4V
VOUT = 3.3V
1 10 100 1000
IOUT (mA)
DS20005173B-page 2
2013 - 2016 Microchip Technology Inc.



Part Number MCP16251
Description PFM/PWM Synchronous Boost Regulator
Maker Microchip - Microchip
Total Page 30 Pages
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