MCP16251 Datasheet, PDF (1/34 Pages) Microchip Technology – Low Quiescent Current, PFM/PWM Synchronous Boost Regulator

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:
- I_OUT > 100 mA @ 3.3V V_OUT, 1.2V V_IN
- I_OUT > 250 mA @ 3.3V V_OUT, 2.4V V_IN
- I_OUT > 225 mA @ 5.0V V_OUT, 3.3V V_IN
• Low Device Quiescent Current:
- Output Quiescent Current: < 4 µA typical, 
device is not switching (V_OUT > V_IN,
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  V_OUT < 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
- 2 x 3 8-Lead TDFN
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.
A 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, while operating at no load (V_OUT = 3.3V,
V_IN = 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 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 and
2 x 3 TDFN-8, are available.
Package Types
MCP16251/2
6-Lead SOT-23
MCP16251/2
2x3 TDFN*
SW 1
GND 2
EN 3
6 ^VIN V_FB 1
8 V_IN
5 ^VOUT ^{SGND 2}
4 V_FB
P_GND 3
EN 4
EP
9
7 V_OUTS
6 V_OUTP
5 SW
* Includes Exposed Thermal Pad (EP); see Table 3-1.
 2013 Microchip Technology Inc.
DS25173A-page 1