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AS1322
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
The AS1322/AS1322B can operate from a single-cell input voltage (V IN ) below 1V, and feature fixed frequency (1.2MHz) and current mode
PWM control for exceptional line- and load-regulation. With low R DS(ON) and gate charge internal NMOS and PMOS switches, the devices
maintain high-efficiency from light to heavy loads.
Modern portable devices frequently spend extended time in low-power or standby modes, switching to high power-drain only when certain
functions are enabled. The AS1322A and the AS1322B are ideal for portable devices since they maintain high-power conversion efficiency over
a wide output power range, thus increasing battery life in these types of devices.
In addition to high-efficiency at moderate and heavy loads, the AS1322A includes an automatic powersave mode that improves efficiency of the
power converter at light loads. The powersave mode is initiated if the output load current falls below a factory programmed threshold (see Figure
3 on page 5) .
Note: The AS1322B does not support powersave mode and provides continuous operation at light loads, eliminating low-frequency V OUT
ripple at the expense of light load efficiency.
Figure 15. AS1322 - Block Diagram
L1
4.7μH
1
SW
1.5V
Single Cell
6
V IN
C IN
1μF
Start Up
OSC
PWM
A
B
A/B
MUX
V OUT
Good
–
+
2.3V
5
V OUT
3.3V
Output
Control
Sync Drive
0.35 ?
0.45 ?
Shutdown
4
SHDNN
1.2MHz
Ramp
Generator
+
PWM –
Comp
–
Shutdown
Control
Powersave
Slope
Compensator
R C
80k ?
C C
150pF
Control
Σ
C P2
2.5pF
Current
Sense
AS1322
–
g m Error
Amp
+
1.23V
3
FB
C FF *
R 1
1.02M ?
1%
C OUT
4.7μF
R 2
640k ? 1%
Powersave
Operation
Control
2
GND
Ref
* Optional
8.1 Low-Voltage Start-Up
The AS1322 requires V IN of only 0.85V (typ) or higher to start up. The low-voltage start-up circuitry controls the internal NMOS switch up to a
maximum peak inductor current of 850mA (typ), with 1.5ms (approx.) off-time during start-up, allowing the devices to start up into an output load.
With a V OUT > 2.3V, the start-up circuitry is disabled and normal fixed-frequency PWM operation is initiated. In this mode, the AS1322 operates
independent of V IN , allowing extended operating time as the battery can drop to several tenths of a volt without affecting output regulation. The
limiting factor for the application is the ability of the battery to supply sufficient energy to the output.
www.ams.com/DC-DC_Step-Up/AS1322
Revision 1.10
7 - 18
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