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  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP1640C Datasheet

0.65V Start-up Synchronous Boost Regulator

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MCP1640C pdf
MCP1640/B/C/D
0.65V Start-Up Synchronous Boost Regulator
with True Output Disconnect or Input/Output Bypass Option
Features
• Up to 96% Typical Efficiency
• 800 mA Typical Peak Input Current Limit:
- IOUT > 100 mA @ 1.2V VIN, 3.3V VOUT
- IOUT > 350 mA @ 2.4V VIN, 3.3V VOUT
- IOUT > 350 mA @ 3.3V VIN, 5.0V VOUT
• Low Start-Up Voltage: 0.65V, typical 3.3V VOUT
@ 1 mA
• Low Operating Input Voltage: 0.35V, typical
3.3VOUT @ 1 mA
• Adjustable Output Voltage Range: 2.0V to 5.5V
• Maximum Input Voltage VOUT < 5.5V
• Automatic PFM/PWM Operation (MCP1640/C):
- PFM Operation Disabled (MCP1640B/D)
- PWM Operation: 500 kHz
• Low Device Quiescent Current: 19 µA, typical
PFM Mode (not switching)
• Internal Synchronous Rectifier
• Internal Compensation
• Inrush Current Limiting and Internal Soft Start
• Selectable, Logic Controlled Shutdown States:
- True Load Disconnect Option (MCP1640/B)
- Input to Output Bypass Option (MCP1640C/D)
• Shutdown Current (All States): < 1 µA
• Low Noise, Anti-Ringing Control
• Overtemperature Protection
• Available Packages:
- 6-Lead SOT-23
- 8-Lead 2 x 3 mm DFN
Applications
• One, Two and Three Cell Alkaline and NiMH/NiCd
Portable Products
• Single-Cell Li-Ion to 5V Converters
• Li Coin Cell Powered Devices
• Personal Medical Products
• Wireless Sensors
• Handheld Instruments
• GPS Receivers
• Bluetooth Headsets
• +3.3V to +5.0V Distributed Power Supply
General Description
The MCP1640/B/C/D is a compact, high-efficiency,
fixed frequency, synchronous step-up DC-DC con-
verter. It provides an easy-to-use power supply solution
for applications powered by either single-cell, two-cell,
or three-cell alkaline, NiCd, NiMH, and single-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 0.65V input. High efficiency is accomplished
by integrating the low resistance N-Channel Boost
switch and synchronous P-Channel switch. All
compensation and protection circuitry is integrated to
minimize the number of external components. For
standby applications, the MCP1640 consumes only
19 µA while operating at no load, and provides a true
disconnect from input to output while in Shutdown
(EN = GND). Additional device options are available by
operating in PWM-Only mode and connecting input to
output while the device is in Shutdown.
The “true” load disconnect mode provides input-to-out-
put isolation while the device is disabled by removing
the normal boost regulator diode path from input-to-
output. The Input-to-Output Bypass mode option con-
nects the input to the output using the integrated low
resistance P-Channel MOSFET, which provides a low
bias voltage for circuits operating in Deep Sleep mode.
Both options consume less than 1 µA of input current.
Output voltage is set by a small external resistor
divider. Two package options are available, 6-Lead
SOT-23 and 8-Lead 2 x 3 mm DFN.
Package Types
MCP1640
6-Lead SOT-23
MCP1640
8-Lead 2 x 3 DFN*
SW 1
GND 2
EN 3
6 VIN
VFB 1
8 VIN
5 VOUT SGND 2 EP 7 VOUTS
4 VFB
PGND 3
EN 4
9
6 VOUTP
5 SW
* Includes Exposed Thermal Pad (EP); see Table 3-1.
2010-2015 Microchip Technology Inc.
DS20002234D-page 1



  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP1640C Datasheet

0.65V Start-up Synchronous Boost Regulator

No Preview Available !

MCP1640C pdf
MCP1640/B/C/D
Typical Application
L1
4.7 µH
VIN
0.9V to 1.7V
+ CIN
4.7 µF
-
SW VOUT
VIN
EN VFB
GND
VOUT
3.3V @ 100 mA
976 k
562 k
COUT
10 µF
VIN
3.0V to 4.2V
+ CIN
4.7 µF
-
L1
4.7 µH
SW VOUTS
VIN VOUTP
EN VFB
PGND SGND
VOUT
5.0V @ 300 mA
976 k
309 k
COUT
10 µF
100.0
80.0
60.0
Efficiency vs. IOUT for 3.3VOUT
VIN = 2.5V
VIN = 0.8V
VIN = 1.2V
40.0
0.1
1.0
10.0
100.0
Output Current (mA)
1000.0
DS20002234D-page 2
2010-2015 Microchip Technology Inc.



  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP1640C Datasheet

0.65V Start-up Synchronous Boost Regulator

No Preview Available !

MCP1640C pdf
MCP1640/B/C/D
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings †
EN, VFB, VIN, VSW, VOUT - GND ......................... +6.5V
EN, VFB ....<maximum of VOUT or VIN > (GND – 0.3V)
Output Short-Circuit Current ...................... Continuous
Output Current Bypass Mode........................... 400 mA
Power Dissipation ............................ Internally Limited
Storage Temperature ......................... -65°C to +150°C
Ambient Temp. with Power Applied...... -40°C to +85°C
Operating Junction Temperature........ -40°C to +125°C
ESD Protection On All Pins:
HBM........................................................ 3 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
specification is not intended. Exposure to maximum
rating conditions for extended periods may affect
device reliability.
DC CHARACTERISTICS
Electrical Characteristics: Unless otherwise indicated, VIN = 1.2V, COUT = CIN = 10 µF, L = 4.7 µH, VOUT = 3.3V,
IOUT = 15 mA, TA = +25°C. Boldface specifications apply over the TA range of -40°C to +85°C.
Parameters
Sym.
Min. Typ. Max. Units
Conditions
Input Characteristics
Minimum Start-Up Voltage
Minimum Input Voltage After
Start-Up
VIN
— 0.65 0.8
V Note 1
VIN
— 0.35
V Note 1
Output Voltage Adjust Range
Maximum Output Current
Feedback Voltage
Feedback Input Bias Current
Quiescent Current – PFM
Mode
VOUT
IOUT
VFB
IVFB
IQPFM
2.0
1.175
150
150
350
1.21
10
19
5.5
1.245
30
V VOUT VIN; Note 2
mA 1.2V VIN, 2.0V VOUT
mA 1.5V VIN, 3.3V VOUT
mA 3.3V VIN, 5.0V VOUT
V
pA
µA Measured at VOUT = 4.0V;
EN = VIN, IOUT = 0 mA;
Note 3
Quiescent Current – PWM
Mode
IQPWM
— 220
µA Measured at VOUT = 4.0V;
EN = VIN, IOUT = 0 mA;
Note 3
Quiescent Current – Shutdown
IQSHDN
— 0.7 2.3 µA VOUT = EN = GND;
Includes N-Channel and
P-Channel Switch Leakage
NMOS Switch Leakage
INLK
— 0.3 — µA VIN = VSW = 5V;
VOUT = 5.5V
VEN = VFB = GND
PMOS Switch Leakage
IPLK
— 0.05
µA VIN = VSW = GND;
VOUT = 5.5V
Note 1: 3.3 kresistive load, 3.3VOUT (1 mA).
2: For VIN > VOUT, VOUT will not remain in regulation.
3: IQOUT is measured at VOUT; VOUT is externally supplied with a voltage higher than the nominal 3.3V output
(device is not switching); no load; VIN quiescent current will vary with boost ratio. VIN quiescent current
can be estimated by: (IQPFM * (VOUT/VIN)), (IQPWM * (VOUT/VIN)).
4: Peak current limit determined by characterization, not production tested.
5: 220resistive load, 3.3VOUT (15 mA).
2010-2015 Microchip Technology Inc.
DS20002234D-page 3




Part Number MCP1640C
Description 0.65V Start-up Synchronous Boost Regulator
Maker Microchip Technology
Total Page 30 Pages
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