Data Sheet
AS1326
High Current, 0.8A DC-DC Step-Up Converters
1 General Description
2 Key Features
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Up to 800mA Output
The AS1326A/AS1326B are high-efficiency, high cur-
rent, DC-DC step-up converters specifically designed for
battery-powered wireless applications. Low quiescent
supply current (65µA), high operating frequency (1MHz),
and minimal external component requirements make
these devices perfect for small hand-held applications.
Constant-Frequency (1MHz) Operation
Up to 96% Efficiency
Input Range: 0.7 to 5.0V
Table 1. Standard Products
Fixed Output: 3.3V
Model
Input Signal Activation
Logic-Low On
Adjustable Output: 2.5 to 5.0V
PWM Synchronous-Rectified Technology
Logic-Controlled Shutdown: 0.1µA
AS1326A
AS1326B
Logic-High On
Both devices use synchronous-rectified pulse-width
modulation (PWM) boost technology to generate 2.5 to
5.0V outputs from a wide range of inputs, such as 1 to 3
alkaline/NiCd/NiMH cells or a single lithium-ion (Li+)
cell. Automatic powersave operation significantly
improves efficiency at light-loads.
Synchronizable Switching Frequency
(0.5 to 1.2MHz)
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Adjustable Current Limit
Adjustable Soft-Start
Continuous switching mode is available for applications
requiring constant-frequency operation at all load cur-
rents. PWM operation can also be synchronized to an
external clock to protect sensitive frequency bands in
communications equipment.
10-pin TDFN (3.0mm x 3.0mm) Package
3 Applications
Analog soft-start and adjustable current limit permit opti-
mization of rush in current and external component size.
The devices are ideal for digital cordless phones. mobile
phones, wireless handsets, hand-held instruments,
PDAs, two-way pagers, and any battery-operated equip-
ment.
The AS1326A/AS1326B are available in a 10-pin TDFN
(3.0mm x 3.0mm) package.
Figure 1. Block Diagram
Undervoltage
Lockout
5
AS1326
+
–
OUT
IC Power
2.15V
9
On
Startup
Osc
Q
D
10
POUT
AS1326B
only
ON
10
Controller
AS1326A
only
8
ONN
2
On
Rdy
En
Osc
LX
Reference
1.25V
En
Osc
Ref GND
1MHz Osc
CLK/SEL Mode
REF
3
7
Mode
PGND
GND
6
FB ISET
CLK/SEL
4
FB
1
ISET
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