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參數(shù)資料
| 型號： | AS1322B-BTTT |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | DC/DC變換器 |
| 英文描述： | Adj., 315mA, 1.2 MHz, Boost; Package Type: TSOT23-6; Miscellaneous: with Continuous Switching |
| 中文描述： | 低電壓，微功耗，型DC - DC升壓轉換器 |
| 封裝： | TSOT23-6 |
| 文件頁數(shù)： | 7/18頁 |
| 文件大小： | 900K |
| 代理商： | AS1322B-BTTT |
7 - 18
AS1322
Datasheet - Detailed Description
8 Detailed Description
The AS1322/AS1322B can operate froma single-cell input voltage (V
IN
) below 1V, and feature fixed frequency (1.2MHz) and current mode
PWMcontrol for exceptional line- and load-regulation. With low R
DS(ON)
and gate charge internal NMOS and PMOS switches, the devices
maintain high-efficiency fromlight 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, elimnating low-frequency V
OUT
ripple at the expense of light load efficiency.
Figure 15. AS1322 - Block Diagram
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
maximumpeak 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 PWMoperation 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
limting factor for the application is the ability of the battery to supply sufficient energy to the output.
AS1322
+
–
Start Up
OSC
PWM
Control
A/B
MUX
Slope
Compensator
1.2MHz
Ramp
Generator
+
–
–
Powersave
Operation
Control
Shutdown
Control
PWM
Comp
Σ
+
–
1.23V
Ref
Sync Drive
Control
A
B
V
OUT
Good
2.3V
g
m
Error
Amp
Shutdown
Powersave
0.35
Ω
0.45
Ω
R
2
640k
Ω
1%
R
1
1.02M
Ω
1%
C
FF
*
C
OUT
4.7μF
3.3V
Output
C
IN
1μF
1.5V
Single Cell
*Optional
Current
Sense
R
C
80k
Ω
C
P2
2.5pF
C
C
150pF
GND
2
SW
1
4
SHDNN
3
FB
6
V
IN
5
V
OUT
L1
4.7μH
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