AS1345 – 4 18V, High Efficiency, DC-DC Step-Up Converter
6B3SWOUT
Shutdown Disconnect Switch Out. Output pin of the internal
P-channel MOSFET. Connect to power inductor and decouple to GND
with a 10µF low ESR ceramic capacitor.
When the input disconnect feature is not desired, SWOUT should be
connected to SWIN and VDD.
5B4SWIN
Shutdown Disconnect Switch In. Input pin of the internal P-channel
MOSFET.
1A1 VDD
Supply Voltage. Connect to a 2.9V to 5.0V input supply. Bypass this pin
with a 10µF capacitor.
9- NC
Exposed Pad. This pad is not connected internally. This pin also
functions as a heat sink. Solder it to a large pad or to the circuit-board
ground plane to maximize power dissipation.
Pin Number
Pin Name Description
TDFN WLP
18V, High Efficiency, DC-DC Step-Up Converter AS1345 – 5
Stresses beyond those listed in the table below may cause
permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other
conditions beyond those indicated in “Electrical
Characteristics” on page 6 is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Figure AS1345 – 6:
Absolute Maximum Ratings
Note: The reflow peak soldering temperature (body temperature) specified is in accordance with IPC/JEDEC
J-STD-020“Moisture/Reflow Sensitivity Classification for Non-Hermetic Solid State Surface Mount Devices”.
Parameter Min Max Unit Comments
Electrical Parameters
VDD, SWIN, SWOUT to GND -0.3 7 V
LX, FB to GND -0.3 20 V
Input Current (latch-up
immunity)
-100 100 mA Norm: JEDEC 78
SWIN to SWOUT Current Limit 1 A
Electrostatic Discharge
Electrostatic Discharge HBM ±2 kV Norm: MIL 883 E method 3015
Temperature Ranges and Storage Conditions
Junction temperature +110 ºC
Storage temperature range
-55 +125 ºC for WL-CSP
-55 +150 ºC for TDFN
Package thermal
data
WL-CSP 60
ºC/W
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.
TDFN 97
Package body
temperature
WL-CSP
+260 ºC
Norm IPC/JEDEC J-STD-020
TDFN Norm IPC/JEDEC J-STD-020
Humidity non-condensing 5 85 %
Moisture sensitive level
3
Represents a maximum floor life time of 168h
for TDFN
1
Represents a maximum floor life time of
unlimited for WL-CSP
Absolute Maximum Ratings
AS1345 – 6 18V, High Efficiency, DC-DC Step-Up Converter
All limits are guaranteed. The parameters with Min and Max
values are guaranteed by production tests or SQC (Statistical
Quality Control) methods.
V
DD
=
V
SHDNN
= V
SWIN
= 3.7V, V
OUT
= 15V,
C
IN
= C
OUT
= 10μF, typical
values @ T
AMB
= +25ºC (unless otherwise specified).
All limits are
guaranteed.
Symbol Parameter Conditions Min Typ Max Units
T
AMB
Operating temperature range -40 +85 °C
T
J
Operating junction
temperature range
-40 +110 °C
Input
V
DD
Supply voltage range SWIN connected to VDD 2.9 5.0 V
Minimum startup voltage VDD = SWIN 2.7 V
V
UVLO
V
DD
undervoltage lockout
V
DD
decreasing (50mV
Hysteresis)
2.7 V
Regulation
V
OUT
Adjustable output voltage
range
External FB divider 5 18 V
Feedback voltage tolerance
Tolerance of FB resistors not
included
-3 +3 %
Fixed output voltage Internal FB divider
12
V15
17
V
FB
Feedback voltage
For adjustable V
OUT
only
1.25 V
Feedback input current 10 1000 nA
Line regulation VDD = 3.5V to 3.7V 200 mV
Load regulation
V
OUT
= 15V, I
LOAD
= 0mA to
5mA
50 mV
η Efficiency
L = 22µH, V
DD
= V
SWIN
=
3.7V,
V
OUT
= 15V, I
LOAD
= 10mA
90 %
Operating Current
I
SHDN
Shutdown current @ VDD
V
SHDNN
= 0V
1
µA
Shutdown current @ SWIN 1
I
Q
Quiescent current No switching, V
FB
= 1.5V 25 µA
I
DDLOAD
Load current V
OUT
= 15V, I
LOAD
= 5mA 25 mA
Electrical Characteristics

AS1345B-BTDT-AD

Mfr. #:
Manufacturer:
ams
Description:
Voltage Regulators - Switching Regulators 18V Hi-Eff DC/DC Step-Up Converter IC
Lifecycle:
New from this manufacturer.
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