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PDF AS1312 Data sheet ( Hoja de datos )
| Número de pieza | AS1312 | |
| Descripción | Hysteretic DC-DC Step-up Converter | |
| Fabricantes | ams | |
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AS1312
Ultra Low Quiescent Current,
Hysteretic DC-DC Step-up Converter
General Description
The AS1312 is an ultra low IQ hysteretic step-up DC-DC
converter.
The AS1312 achieves an efficiency of up to 94% and is designed
to operate from a +0.7V to +5.0V supply, the output voltage is
fixed in 50mV steps from +2.5V to 5.0V.
In order to save power the AS1312 features a shutdown mode,
where it draws less than 100nA. In shutdown mode the battery
is not connected to the output.
If the input voltage exceeds the output voltage the device is in
a feedthrough mode and the input is directly connected to the
output voltage.
In light load operation, the device enters a sleep mode when
most of the internal operating blocks are turned off in order to
save power. This mode is active approximately 50μs after a
current pulse provided that the output is in regulation.
The AS1312 also offers an adjustable low battery detection. If
the battery voltage decreases below a threshold defined by two
external resistors on pin LBI, the LBO output is pulled to logic
low. LBO is working as Power-OK when LBI is connected to GND.
The AS1312 is available in a 8-pin (2x2) TDFN and a 0.4mm pitch
8-pin WL-CSP package.
Ordering Information and Content Guide appear at end of
datasheet.
Figure 1:
Added Value of Using AS1312
Key Benefits & Features
The benefits and features of AS1312, Ultra Low Quiescent
Current, Hysteretic DC-DC Step-up Converter are listed below:
Benefits
Ideal for single Li-Ion battery powered applications
Extended battery life
Less Power Consumption
Supports a variety of end applications
Features
Wide Input Voltage Range (0.7V to 5.0V)
Feedthrough mode when VIN > VOUT
High Efficiency up to 94%
Low Quiescent Current of typ. 1uA
Low Shutdown Current of less than 100nA
Fixed output voltage range (2.5V to 5.0V)
Peak Output Current of 200mA
Output Disconnect in shutdown
ams Datasheet, Confidential
[v1-18] 2014-Dec-15
Page 1
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1 page  
AS1312 − Electrical Characteristics
Parameter
Moisture
Sensitivity Level
Min
WL-CSP
TDFN
Max
1
Unit Comments
Represents an unlimited floor life time
Represents an unlimited floor life time
Note(s) and/or Footnote(s):
1. Junction-to-ambient thermal resistance is very dependent on application and board-layout. In situations where high maximum
power dissipation exists, special attention must be paid to thermal dissipation during board design.
2. The reflow peak soldering temperature (body temperature) is specified according IPC/JEDEC J-STD-020 “Moisture/Reflow Sensitivity
Classification for Nonhermetic Solid State Surface Mount Devices”
Electrical Characteristics
Figure 6:
Electrical Characteristics
All limits are guaranteed. The parameters with Min and Max
values are guaranteed by production tests or SQC (Statistical
Quality Control) methods.
VIN = 1.5V, C1 = C2 = 22μF, CREF = 100nF, Typical values are at
TAMB = 25ºC. Unless otherwise specified. All limits are guaranteed.
The parameters with min and max values are guaranteed with
production tests or SQC (Statistical Quality Control) methods.
Symbol
Parameter
VIN Input Voltage Range
Minimum Startup Voltage
VOUT Output Voltage Range
Output Voltage Tolerance
VOUT Lockout Threshold (1)
Quiescent Current VIN
IQ
Quiescent Current VOUT
IQSHDN Shutdown Current
Conditions
Input
TAMB = 25°C
Regulation
ILOAD = 0mA to 10mA,
TAMB = 25°C
ILOAD = 0mA to 10mA
ILOAD = 0mA to 30mA,
TAMB = -20°C to 60°C
Rising Edge
Operating Current
VOUT = 1.02xVOUTNOM,
REF = 0.99xVOUTNOM,
TAMB = 25°C
VOUT = 5V, No load,
TAMB = 25°C
TAMB = 25ºC
Min Typ Max Unit
0.7 5.0
0.9
V
V
2.5 5.0
-2 2
-4 4
-2 2
2.45
V
%
%
%
V
100 nA
0.7 1 1.3 μA
100 nA
ams Datasheet, Confidential
[v1-18] 2014-Dec-15
Page 5
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5 Page 
AS1312 − Detailed Description
Figure 13:
Simplified Boost DCDC Architecture
VIN
0V
L1
SW2
Q
CIN SW1 Q
FB
IPK
GND
COUT
VOUT
RLOAD
0V
On time of the power switch (Faraday’s Law) is given by:
(EQ1)
TON
=
----------------------------L---I--P----K----------------------------
VIN – (IPKRSW1 + IPKRL1)
sec
[volts,
amps,
ohms, Henry]
Applying Min and Max values and neglecting the resistive
voltage drop across L1 and SW1;
(EQ2)
T = L V ION _ MIN
MIN PK _ MIN
IN _ MAX
(EQ3)
T = L V ION _ MAX
MAX PK _ MAX
IN _ MIN
ams Datasheet, Confidential
[v1-18] 2014-Dec-15
Page 11
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11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AS1312.PDF ] | |
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