High-Efficiency Synchronous Step-up DC/DC
Converter with Selectable Current Limit
High efficiency (93% with VIN=2.4V, VOUT= 3.3V,
Output current up to 500mA. (VIN=2.4V, at
Quiescent supply current of 20µA
Power-saving shutdown mode (0.1µA typical).
Internal synchronous rectifier (no external diode
Selectable current limit for reduced ripple.
Low-noise, anti-ringing feature.
On-chip low-battery detector.
Space-saving package: MSOP-10
Palmtop & Notebook Computers.
Hand-Held Devices with 1 to 3 Cells of
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
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
Selectable Current Limit
(1.0A or 0.65A)
REF GND FB
Output 3.3V, 5.0V
or Adj. (1.8V to
5.5V) up to 300mA
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