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參數(shù)資料
| 型號： | AIC1622COTR |
| 廠商： | Analog Integrations Corporation |
| 英文描述： | High Efficiency Synchronous Step-Up DC/DC Converter |
| 中文描述： | 高效率同步降壓型DC / DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 456K |
| 代理商： | AIC1622COTR |
AIC1620/AIC1621/AIC1622
8
AIC1622
PIN 1: FB-
Connect to OUT for +3.3V output.
Use a resistor network to set the
output voltage from +1.8V to +4.0V.
Low-Battery comparator input. Inter-
nally set to trip at +1.23V.
Open-drain low battery comparator
output. Output is low when VLBI is
<1.23V. LBO is high impedance
during shutdown.
PIN 4: CLSEL-Current-limit selects input. CLSEL=
OUT sets the current limit to 0.8A.
CLSEL=GND sets the current limit
to 0.45A.
PIN 2: LBI-
PIN 3: LBO-
PIN 5:
REF-
1.23V reference voltage. Bypass
with a 0.1
μ
F capacitor.
SHDN- Shutdown input. High=operating,
low=shutdown.
BATT- Battery input and damping switch
connection. If damping switch is
unused, leave BATT unconnected.
GND-
Ground.
LX-
N-channel and P-channel power
MOSFET drain.
PIN 10: OUT-
Power output. OUT provides
bootstrap power to the IC.
PIN 6:
PIN 7:
PIN 8:
PIN 9:
n
APPLICATION INFORMATION
Overview
The AIC1620/AIC1621/AIC1622 series are high effi-
ciency, step-up DC-DC converters, designed to fea-
ture a built-in synchronous rectifier, which reduces
size and cost by eliminating the need for an external
Schottky diode. The start-up voltage is as low as
0.9V and operate with an input voltage down to 0.7V.
Quiescent supply current is only 20
μ
A. In addition,
the AIC1622 feature a circuit that eliminates inductor
ring to reduce noise. The internal P-MOSFET on-
resistance is typically 0.3
to improve overall effi-
ciency by minimizing AC losses. The current limit of
the AIC1620 and AIC1621 are 0.8A and 0.45A re-
spectively. The AIC1622 offers a selectable current
limit(0.45A or 0.8A). The lower current limit allows the
use of a physically smaller inductor in space-
sensitive applications.
PFM Control Scheme
The key feature of the AIC1620 series is a unique
minimum-off-time, current-limited, pulse-frequency-
modulation (PFM) control scheme (see BLOCK
DIAGRAM) with the ultra-low quiescent current . A
constant-peak-current limit in the switching allows the
inductor current to vary between this peak limit and
some lesser value. The peak current of the internal N-
MOSFET power switch can be fixed at 0.8A, 0.45A or
is selectable. Besides, the ripple voltage dose not
exceed the product of the peak current limit and the
filter capacitor equivalent series resistance (ESR).
The switch frequency depends on the loading condi-
tion and input voltage, and can range up to 500KHz.
The switching frequency is governed by a pair of one-
shots that set a minimum off-time (1
μ
S) and a maxi-
mum on-time (4
μ
S).
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