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SS6622 Folha de dados(PDF) 8 Page - Silicon Standard Corp.

Nome de Peças SS6622
Descrição Electrónicos  High Efficiency Synchronous Step-Up DC/DC Converter
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Fabricante Electrônico  SSC [Silicon Standard Corp.]
Página de início  http://www.siliconstandard.com
Logo SSC - Silicon Standard Corp.

SS6622 Folha de dados(HTML) 8 Page - Silicon Standard Corp.

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SS6620/21/2
SS6622
PIN 1: FB-
Connect to OUT for +3.3V output.
Use a resistor network to set the out-
put voltage from +1.8V to +4.0V.
PIN 2: LBI-
Low-Battery comparator input. Inter-
nally set to trip at +1.23V.
PIN 3: LBO- Open-drain low battery comparator
output. Output is low when VLBI is
<1.23V. LBO is high impedance dur-
ing 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 5: REF-
1.23V reference voltage. Bypass
with a 0.1
µF capacitor.
PIN 6: SHDN- Shutdown input. High=operating,
low=shutdown.
PIN 7: BATT- Battery input and damping switch
connection. If damping switch is
unused, leave BATT unconnected.
PIN 8: GND-
Ground.
PIN 9: LX-
N-channel and P-channel power
MOSFET drain.
PIN 10: OUT-
Power output. OUT provides boot-
strap power to the IC.
n APPLICATION INFORMATION
Overview
The SS6620/21/22 series are high efficiency,
step-up DC/DC converters, designed to feature 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 0.8V and they
can operate with an input voltage down to 0.7V. Qui-
escent supply current is only 20
µA. In addition, the
SS6622 feature a circuit that eliminates inductor-
ringing to reduce noise. The internal P-MOSFET on-
resistance is typically 0.3
Ω to improve overall effi-
ciency by minimizing AC losses. The current limit of
the SS6620 and SS6621 is 0.8A and 0.45A
respectively. The SS6622 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 SS6620 series is a unique
minimum-off-time, current-limited, pulse-frequency-
modulation (PFM) control scheme (see BLOCK
DIAGRAM) with ultra-low quiescent current. A con-
stant-peak-current limit in the switching allows the in-
ductor 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. The ripple voltage does not exceed the
product of the peak current limit and the filter capaci-
tor equivalent-series-resistance (ESR). The switch
frequency depends on the loading condition 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
µs) and a maximum on-time
(4
µs).
Rev.2.01 6/06/2003


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