SS6612 Datasheet, PDF (1/16 Pages) Silicon Standard Corp. – High-Efficiency Synchronous Step-up DC/DC Converter with Selectable Current Limit

SS6612
High-Efficiency Synchronous Step-up DC/DC
Converter with Selectable Current Limit
FEATURES
High efficiency (93% with VIN=2.4V, VOUT= 3.3V,
I_OUT=200mA)
Output current up to 500mA. (VIN=2.4V, at
V_OUT=3.3V, CLSEL=OUT)
Quiescent supply current of 20µA
Power-saving shutdown mode (0.1µA typical).
Internal synchronous rectifier (no external diode
required).
Selectable current limit for reduced ripple.
Low-noise, anti-ringing feature.
On-chip low-battery detector.
Low-battery hysteresis.
Space-saving package: MSOP-10
APPLICATIONS
Palmtop & Notebook Computers.
PDAs
Wireless Phones
Pocket Organizers.
Digital Cameras.
Hand-Held Devices with 1 to 3 Cells of
NiMH/NiCd Batteries.
DESCRIPTION
The SS6612 is a high-efficiency step-up
DC/DC converter, with a start-up voltage as low
as 0.8V, and an operating voltage down to 0.7V.
Consuming only 20µA of quiescent current,
this device includes a built-in synchronous rec-
tifier that reduces size and cost by eliminating
the need for an external Schottky diode, and
improves overall efficiency by minimizing
losses.
The switching frequency can range up to
500KHz depending on the load and input volt-
age. The output voltage can be easily set; by
two external resistors for 1.8V to 5.5V; con-
necting FB to OUT to get 3.3V; or connecting
to GND to get 5.0V. For additional design flexibil-
ity, the peak current of the internal switch is
selectable (0.65A or 1.0A). The SS6612 also
features a circuit that eliminates noise caused
by inductor ringing.
TYPICAL APPLICATION CIRCUIT
V_IN
ON
OFF
Selectable Current Limit
(1.0A or 0.65A)
Low Battery
Detection
+
47µF
SHDN
200Ω
BATT
LX
CLSEL
OUT
SS6612
LBI
LBO
REF GND FB
0.1µF
22µH
Output 3.3V, 5.0V
+
or Adj. (1.8V to
5.5V) up to 300mA
47µF
Low-battery
Detect Out
Rev.2.02 12/06/2003
www.SiliconStandard.com
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