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PDF AP4460 Data sheet ( Hoja de datos )
| Número de pieza | AP4460 | |
| Descripción | Step-up DC-DC Converter | |
| Fabricantes | AKM | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AP4460 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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[AP4460]
AP4460
Step-up DC-DC Converter with Power Path for Single Solar Cell
1. General Description
The AP4460 is a synchronous step-up DC-DC converter that can be operated by a single solar cell. It has a power
management function which supplies power to an external system, charges super capacitors, or supplies power
from the super capacitor to the system. The DC-DC converter is a hysteric comparator type and composed of an
ultra-low power start-up circuit which starts from only 0.35 V. Because the power consumption is extremely low,
the AP4460 can operate with low input power generated by a solar panel under indoor lighting. The input voltage
of the DC-DC converter, i.e. output voltage of the solar cell is controlled by external resistors for the reference
voltage of the IC. The best power efficiency can be obtained by adjusting this input level setting according to the
characteristics of a connected solar cell. The AP4460 has a Power-Path Control switches for supplying power to
the external system and charging a super capacitor. When the output voltage of DC-DC converter reaches a target
voltage, the IC starts to charge a compact capacitor. After charging up to the target voltage of a compact capacitor,
then the IC starts to supply power to the external system. Supplying power to the external system via capacitor
makes it possible to operate high load external system even with a low input power. If the input power is surplus,
the extra power is stored gradually in a super capacitor. The super capacitor automatically supplies power to the
external system, if the power supply input is low. The AP4460 is suitable for sensor nodes of energy harvesting
equipment.
2. Features
Start-up with Ultra-low Input Voltage 0.35V(typ)
Ultra-low Current Consumption (internal current consumption from storage element)
10nA
Operating Temperature Range -30 ~ 85°C
Input Voltage from 0.14V
DC-DC Output Voltage 2.5 ~ 4.0V
Step up DC-DC Converter with Hysteric Comparator Control
Synchronous Rectification by High-side Zero-cross Detection
Built-in Output Control MOSFET
Power Path Function that Automatically Supplies Power to External System from Storage Element
(when input power is insufficient)
DC-DC Operation Monitoring Function
Supply power to External System Quickly without depending on Storage Element
Efficiency 80% (When 0.5V and 1mA Input, 3V output)
Package 24-pin QFN
Applications
- Power Supply Systems by Single Solar Cell
- Portable Electronics
- Sensor Nodes
- Wearable Devices
014012310-E-01
-1-
2015/04
1 page  
[AP4460]
7. Absolute Maximum Ratings
Parameter
Symbol
min
max
Unit
Condition
Pin Voltage
Operation Temperature
VIN -0.3 6.5
Ta -30 85
V
℃
Storage Temperature
Junction Temperature
TSTG
-40
150
℃
Tj -40 150 ℃
Power Dissipation
PD - 2.9 W (Note 2)
Note 1. All voltages are with respect to GND, unless otherwise specified.
Note 2. 2-layer board is used. This is calculated as θJA=42C/W. (Metal area of each layer should be more than
70%, Exposed Pad should be connected to GND)
WARNING: Operation at or beyond these limits may result in permanent damage to the device. Normal
operation is not guaranteed at these extremes.
8. Recommended Operating Conditions
Parameter
Input Voltage (VIN pin)
MPPH Voltage
MPPL Voltage
Output Voltage
Power supplying threshold
Stop power supply threshold
Operation Temperature
Junction Temperature
Reference resistor 1
Reference resistor 2
Symbol
VVIN
VMPPH
VMPPL
VVDTGT
VVOUTEN
VVOUTDIS
Ta
Tj
-
-
Condition
VVD>VPORL (after start-up)
VMPPH＞VMPPL
ROUT+RVDSET+RVSSET+RVLSET
RIN+RMPPH+RMPPL
min
0.14
0.16
0.14
2.5
2.2
2.0
-30
-30
3.6
4.6
typ max Unit
-
VVDTGT
V
- 0.8 V
- 0.7 V
- 4.0 V
-
0.94×VVDTGT
V
-
0.90×VVSSET
V
- 85 ℃
- 95 ℃
4 4.4 MΩ
4 4.4 MΩ
014012310-E-01
-5-
2015/04
5 Page 
10.3 Timing Chart
[AP4460]
Figure 7. Timing Chart 1: from Start-up to Charge (No Initial Charging)
Figure 8. Timing Chart 2: from Start-up to Charge (With Initial Charging)
014012310-E-01
- 11 -
2015/04
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet AP4460.PDF ] | |
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