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AS1323
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
The AS1323 is a compact, high-efficiency, step-up DC-DC converter guaranteed to start up with voltages as low as 0.95V, and operate with an
input voltage down to 0.75V. Consuming only 1.6μA of quiescent current, the device includes an integrated synchronous rectifier that eliminates
the need for an external diode and improves overall efficiency by minimizing losses (see Synchronous Rectification on page 8) . The AS1323 also
features an active-low shutdown circuit that supply current to 0.1μA.
Figure 20. Block Diagram
L1
1
4
0.95 to
1.6V
VBATT
C IN
Comparator
Comparator
Discharge
VOUT
C OUT
Voltage
Control
3
SHDNN
AS1323
Logic
Startup
System
Timing
5
LX
Ref
Comparator
Charge
2
VSS
8.1 PFM Control
A forced discontinuous, current-limited, pulse-frequency modulation (PFM) control scheme provides ultra-low quiescent current and high
efficiency over a wide output current-range. Rather than using an integrated oscillator, the inductor current is limited by the 400mA N-channel
current limit or by the 6μs switch maximum on-time. After each device-on cycle, the inductor current must ramp to zero before another cycle can
start. When the error comparator senses that the output has fallen below the regulation threshold, another cycle can begin.
8.2 Synchronous Rectification
The integrated synchronous rectifier eliminates the need for an external Schottky diode, reducing cost and PCB space. During normal operation,
while the inductor discharges, the P-channel MOSFET turns on and shunts the MOSFET body diode. Consequently the rectifier voltage drop is
significantly reduced improving efficiency without the need for external components.
8.3 Low-Voltage Startup Circuit
The AS1323 contains a unique low-voltage startup circuit which ensures start-up even with very high load currents. The minimum start-up
voltage is independent of the load current. This device is powered from pin V BATT , guaranteeing startup at input voltages as low as 0.95V.
8.4 Shutdown
The AS1323 enter shutdown when the SHDNN pin is driven low. During shutdown, the output is completely disconnected from the battery.
Shutdown can be pulled as high as 3.6V, regardless of the voltage at pins V BATT or V OUT . For normal operation, connect SHDN to the input.
Revision 1.07
8 - 14
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