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PDF MCP16252 Data sheet ( Hoja de datos )
| Número de pieza | MCP16252 | |
| Descripción | PFM/PWM Synchronous Boost Regulator | |
| Fabricantes | Microchip | |
| Logotipo |  |
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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
1 page  
MCP16251/2
2.0 TYPICAL PERFORMANCE CURVES
Note:
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
Note: Unless otherwise indicated, VIN = EN = 1.5V, COUT = CIN = 10 µF, L = 4.7 µH, VOUT = 3.3V, ILOAD = 0 mA,
TA = +25°C, SOT-23 package.
10
VOUT = 3.3V
RTOP = 1.69 Mȍ
8 RBOT = 1.0 Mȍ
6
4
2
0
-40 -25 -10 5 20 35 50 65 80
Ambient Temperature (°C)
FIGURE 2-1:
Temperature.
VOUT IQ vs. Ambient
100
95
VOUT = 2.0V
90
85
80
75
70
65
60
55
50
1
FIGURE 2-4:
IOUT.
VIN = 1.5V
VIN = 1.2V
VIN = 0.9V
10 100
IOUT (mA)
1000
2.0V VOUT Efficiency vs.
30
VOUT = 3.3V
25
RTOP = 1.69 Mȍ
RBOT = 1.0 Mȍ
20
15 VIN = 1.2V
10 VIN = 1.5V
VIN = 3.0V
5
0
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
Ambient Temperature (°C)
FIGURE 2-2:
Temperature.
No Load Input Current vs.
100
VOUT = 3.3V
95
90
85
80
75
70
65
60
55
1
FIGURE 2-5:
IOUT.
VIN = 2.5V
VIN = 1.2V
VIN = 0.9V
10 100
IOUT (mA)
1000
3.3V VOUT Efficiency vs.
35
RBOT = 1.0 Mȍ
30
25
20
15
VOUT = 5.0V
10
5
VOUT = 2.0V
VOUT = 3.3V
0
1 1.5 2 2.5 3 3.5 4 4.5
Input Voltage (V)
FIGURE 2-3:
No Load Input Current vs.
VIN, after Start-Up.
100
95
VOUT = 5.0V
90
85
80
75
70
65
60
1
FIGURE 2-6:
IOUT.
VIN = 3.6V
VIN = 2.5V
VIN = 1.2V VIN = 1.8V
10 100
IOUT (mA)
1000
5.0V VOUT Efficiency vs.
2013 - 2016 Microchip Technology Inc.
DS20005173B-page 5
5 Page 
MCP16251/2
4.2 Functional Description
The MCP16251/2 is a compact, high-efficiency, fixed
frequency, step-up DC-DC converter that provides an
easy-to-use power supply solution for applications
powered by either one-cell, two-cell, or three-cell
alkaline, NiCd, or NiMH, or one-cell Li-Ion or
Li-Polymer batteries.
VOUT
Figure 4-1 represents the functional block diagram of
the MCP16251/2.
VIN
Internal
BIAS
+ IZERO
Direction
Control
-
SW .3V SOFT-START
0V
Gate Drive
and
- ILIMIT
EN Shutdown
Control
+
Logic
+ ISENSE
-
GND
Oscillator
Slope
Compensation
S
PWM/PFM
Logic
+
-
FIGURE 4-1:
MCP16251/2 Block Diagram.
+ 1.23V
-
EA
VFB
2013 - 2016 Microchip Technology Inc.
DS20005173B-page 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MCP16252.PDF ] | |
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