Instrukcja obsługi Microchip MCP1642
Microchip
Niesklasyfikowane
MCP1642
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2014 Microchip Technology Inc. DS20005253A-page 1
MCP1642B/D
Features
• Up to 96% Typical Efficiency
• 1.8A Typical Peak Input Current Limit:
- IOUT > 175 mA @ 1.2V VIN, 3.3V VOUT
- IOUT > 600 mA @ 2.4V VIN, 3.3V VOUT
- IOUT > 800 mA @ 3.3V VIN, 5.0V VOUT
- IOUT > 1A @ VIN > 3.6V, 5.0V VOUT
• Low Start-Up Voltage: 0.65V, typical 3.3V V
OUT
@ 1 mA
• Low Operating Input Voltage: 0.35V, typical 3.3V
VOUT @ 1 mA
• Output Voltage Range:
- Reference Voltage, VFB = 1.21V
- 1.8V to 5.5V for the adjustable device option
- 1.8V, 3.0V, 3.3V and 5.0V for fixed V
OUT
options
• Maximum Input Voltage VOUT < 5.5V
• PWM Operation: 1 MHz
- Low Noise, Anti-Ringing Control
• Power Good Open-Drain Output
• Internal Synchronous Rectifier
• Internal Compensation
• Inrush Current Limiting and Internal Soft-Start
• Selectable, Logic-Controlled Shutdown States:
- True Load Disconnect Option (MCP1642B)
- Input-to-Output Bypass Option (MCP1642D)
• Shutdown Current (All States): 1 µA
• Overtemperature Protection
• Available Packages:
- 8-Lead MSOP
- 8-Lead 2x3 DFN
Applications
• One, Two and Three-Cell Alkaline, Lithium
Ultimate and NiMH/NiCd Portable Products
• Single-Cell Li-Ion to 5V Converters
• PIC® MCU Power
• USB Emergency Backup Charger from Batteries
• Personal Medical Products
• Wireless Sensors
• Hand-Held Instruments
• GPS Receivers
• +3.3V to +5.0V Distributed Power Supply
General Description
The MCP1642B/D devices are compact,
high-efficiency, fixed-frequency, synchronous step-up
DC-DC converters. 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, Ultimate Lithium, 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 the number of external
components. An open-drain Power Good output is
provided to indicate when the output voltage is within
10% of regulation and facilitates the interface with an
MCU. For standby applications, MCP1642B provides a
“true output disconnect” from input to output while in
shutdown (EN = GND). An additional device option
(MCP1642D) is available and connects “input to output
bypass” while in shutdown. Both options consume less
than 1 µA of input current.
For the adjustable (ADJ) device options, the output
voltage is set by a small external resistor divider. Fixed
VOUT device options do not require external divider
resistors. Two package options, 8-lead MSOP and 8-
lead 2x3 DFN, are available.
Package Types
PG
NC
VOUT
SGND
PGND
1
2
3
4
8
7
6
5SW
VIN
EN
EP
9
PGND
SGND
PG
VFB
VOUT
SGND
PGND
1
2
3
4
8
7
6
5 SW
VIN
EN
EP
9
6
1
2
3
8VIN
PGND
EN
VFB
PG
7SGND
5
4SW
VOUT
6
1
2
3
8VIN
EN
NC
PG
7
5
4 SWVOUT
MCP1642B/D-xx
MSOP
MCP1642B/D-xx
2x3 DFN*
MCP1642B/D-ADJ
MSOP
MCP1642B/D-ADJ
2x3 DFN*
* Includes Exposed Thermal Pad (EP); see Table 3-1.
1.8A Input Current Switch, 1 MHz Low-Voltage Start-Up
Synchronous Boost Regulator
MCP1642B/D
DS20005253A-page 2 2014 Microchip Technology Inc.
Typical Application
VIN
GND
VFB
VOUT
5.0V
COUT
4.7...10 µF
CIN
4.7...10 µF
L
4.7 µH
SW
976 k
309 k
EN
VOUT
+
-
ALKALINE
1 M
PG
ON
OFF
To PIC MCU I/O
+
-
ALKALINE
RTOP
RBOT RPG
VIN
GND
VOUT
3.3V
COUT
4.7...10 µF
CIN
4.7...10 µF
L1
4.7 µH
SW
EN
VOUT
+
-
ALKALINE
PG
ON
OFF
NC
0
10
20
30
40
50
60
70
80
90
100
1 10 100 1000
Efficiency (%)
I
OUT
(mA)
VIN = 2.5V, VOUT = 5.0V
VIN = 1.2V, VOUT = 3.3V
MCP1642B-33
MCP1642D-ADJ
From PIC®
MCU I/O
VIN= 0.9 to 1.6V
VIN= 1.8 to 3.2V
2014 Microchip Technology Inc. DS20005253A-page 3
MCP1642B/D
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings †
EN, FB, VIN, VSW, VOUT – GND ..........................+6.5V
EN, FB ......<maximum of VOUT or VIN > (GND – 0.3V)
Output Short-Circuit Current ...................... Continuous
Output Current Bypass Mode...........................800 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........................................................ 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
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, MCP1642B/D-ADJ. Boldface specifications apply over the T
A range of -40°C to +85°C.
Parameters Sym. Min. Typ. Max. Units Conditions
Input Characteristics
Minimum Start-Up Voltage VIN — 0.65 0.8 V Note 1
— 0.9 1.8 V MCP1642B/D-50, Note 1
Minimum Input Voltage
After Start-Up
VIN — 0.35 — V Note 1, Note 5
— 0.5 — V Note 1, , MCP1642B/D-50Note 5
Output Voltage Adjust.
Range
(MCP1642B/D-ADJ)
VOUT 1.8 —5.5 V VOUT VIN (MCP1642B/D-ADJ);
Note 2
Output Voltage
(MCP1642B/D-XX)
VOUT — 1.8 — V VIN < 1.8V, MCP1642B/D-18,
Note 2
— 3.0 — V VIN < 3.0V, MCP1642B/D-30,
Note 2
— 3.3 — V VIN < 3.3V, MCP1642B/D-33,
Note 2
— 5.0 — V VIN < 5.0V, MCP1642B/D-50,
Note 2
Maximum Output Current IOUT — 175 — mA 1.2V VIN, 1.8V VOUT
, Note 5
— 300 — mA 1.5V VIN, 3.3V VOUT
, Note 5
— 800 — mA 3.3V VIN, 5.0V VOUT
, Note 5
Feedback Voltage VFB 1.173 1.21 1.247 V
Feedback Input
Bias Current
IVFB — 1.0 — nA Note 5
Note 1: Resistive load, 1 mA.
2: For VIN > VOUT
, VOUT will not remain in regulation.
3: IQPWM is measured from VOUT; VOUT is externally supplied with a voltage higher than the nominal 3.3V
output (device is not switching), no load. V
IN quiescent current will vary with boost ratio. VIN quiescent
current can be estimated by: (IQPWM * (VOUT/VIN)).
4: 220 resistive load, 3.3V VOUT (15 mA).
5: Determined by characterization, not production tested.
Specyfikacje produktu
| Marka: | Microchip |
| Kategoria: | Niesklasyfikowane |
| Model: | MCP1642 |
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