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AS1322 PDF даташит

Спецификация AS1322 изготовлена ​​​​«AMSCO» и имеет функцию, называемую «DC-DC Step-Up Converters».

Детали детали

Номер произв AS1322
Описание DC-DC Step-Up Converters
Производители AMSCO
логотип AMSCO логотип 

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AS1322 Даташит, Описание, Даташиты
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austriamicrosystems
AS1322
Data Sheet
Low Voltage, Micropower, DC-DC Step-Up Converters
1 General Description
The AS1322A and the AS1322B are synchronous, fixed
frequency, very high-efficiency DC-DC boost converters
capable of supplying 3.3V at 150mA from a single AA-
supply. Compact size and minimum external parts
requirements make these devices perfect for modern
portable devices.
High-speed switching frequency (1.2MHz) and internally
compensated PWM current mode design provide highly-
reliable DC-DC conversion, especially when driving
white LEDs.
The converters are available as the standard products
listed in Table 1.
Table 1. Standard Products
Model
Light Load Switching
AS1322A
Automatic Powersave Operation
AS1322B
Continuous Switching
The devices contain two internal MOSFET switches:
one NMOS switch and one PMOS synchronous rectifier.
Anti-ringing control circuitry reduces EMI by damping
the inductor in discontinuous mode, and the devices
exhibit extremely low quiescent current (< 1µA) in shut-
down.
The AS1322 is available in a 6-pin TSOT-23 package.
2 Key Features
! 95% Efficiency
! Single-Cell Operation
! Delivers 150mA @ 3.3V (from Single AA Cell)
! Delivers 500mA @ 3.3V (from Two AA Cells)
! Low Start-Up Voltage: 0.85V
! High-Speed Fixed-Frequency: 1.2MHz
! Internal PMOS Synchronous Rectifier
! Automatic Powersave Operation (AS1322A)
! Continuous Switching at Light Loads (AS1322B)
! Anti-Ringing Control Minimizes EMI
! Logic Controlled Shutdown (< 1µA)
! Output Range: 2.5 to 5.0V
! 6-pin TSOT-23 Package
3 Applications
The AS1322 is ideal for low-power applications where
ultra-small size is critical as in medical diagnostic equip-
ment, hand-held instruments, pagers, digital cameras,
remote wireless transmitters, MP3 players, LCD bias
supplies, cordless phones, GPS receivers, and PC
cards.
Figure 1. Typical Application Diagram – Single Cell to 3.3V Synchronous Boost Converter
L1
10µH
AA Battery
C1
10µF
1 SW
65
VIN VOUT
AS1322
On 4
Off SHDNN
3
FB
2 GND
R1
1.02M
1%
R2
604k
1%
C2
10µF
VOUT
3.3V
150mA
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AS1322 Даташит, Описание, Даташиты
AS1322
Data Sheet
4 Pin Assignments
Figure 2. Pin Assignments (Top View)
SW 1
6 VIN
GND 2 AS1322 5 VOUT
FB 3
4 SHDNN
austriamicrosystems
Pin Descriptions
Pin Descriptions
Table 2. Pin Descriptions
Pin
Name
SW
GND
FB
SHDNN
VOUT
VIN
Pin
Number
1
2
3
4
5
6
Description
Switch Pin. Connect an inductor between this pin and VIN. Keep the PCB
trace lengths as short and wide as is practical to reduce EMI and voltage
overshoot. If the inductor current falls to zero, or pin SHDNN is low, an
internal 100anti-ringing switch is connected from this pin to VIN to
minimize EMI.
Note: An optional Schottky diode can be connected between this pin and
VOUT.
Signal and Power Ground. Provide a short, direct PCB path between this
pin and the negative side of the output capacitor(s).
Feedback Pin. Feedback input to the gm error amplifier. Connect a resistor
divider tap to this pin. The output voltage can be adjusted from 2.5 to 5V by:
VOUT = 1.23V[1 + (R1/R2)]
Shutdown Pin. Logic controlled shutdown input.
1 = Normal operation, 1.2MHz typical operating frequency.
0 = Shutdown; quiescent current <1µA. If SHDNN is undefined, pin SW may
ring.
Note: In a typical application, SHDNN should be connected to VIN through a
1Mpull-up resistor.
Output Voltage Sense Input and Drain of the Internal PMOS
Synchronous Rectifier. Bias is derived from VOUT when VOUT exceeds VIN.
PCB trace length from VOUT to the output filter capacitor(s) should be as
short and wide as is practical. Due to the ESD protection diode of the
internal PMOS synchronous rectifier, VOUT is held at VIN - 0.6V during
shutdown.
Input Voltage. The AS1322 gets its start-up bias from VIN unless VOUT
exceeds VIN, in which case the bias is derived from VOUT. Thus, once
started, operation is completely independent from VIN. Operation is only
limited by the output power level and the internal series resistance of the
supply.
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AS1322 Даташит, Описание, Даташиты
AS1322
Data Sheet
austriamicrosystems
Pin Descriptions
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 3 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 Section 6 Electrical
Characteristics on page 4 is not implied. Exposure to absolute maximum rating conditions for extended periods may
affect device reliability.
Table 3. Absolute Maximum Ratings
Parameter
Min Max Units
Notes
VIN to GND
-0.3 7
V
SHDNN, SW to GND
-0.3 7
V
FB to GND
-0.3 5
V
VOUT
-0.3 7
V
Operating Temperature Range
-40 +85 ºC
Storage Temperature Range
-65 +125
ºC
Package Body Temperature
+260
The reflow peak soldering temperature
(body temperature) specified is in
accordance with IPC/JEDEC J-STD-
ºC
020C “Moisture/Reflow Sensitivity
Classification for Non-Hermetic Solid
State Surface Mount Devices”.
The lead finish for Pb-free leaded
packages is matte tin (100% Sn).
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