AS1336 austriamicrosystems, AS1336 Datasheet - Page 12

• Manufacturer Part Number: AS1336
• Description: Dual, Low Voltage, Micropower Dc-dc Step-up Converters
• Manufacturer: austriamicrosystems

AS1336
Datasheet - D e t a i l e d D e s c r i p t i o n
Notes:
1. An optional capacitor (C
2. In powersave mode the AS1336 draws only 14µA (one chanel on) from the output capacitor(s), greatly improving
Shutdown
Both boost converters can be enabled independently from the other. EN1 will enable boost converter 1 and EN2
enables boost converter 2.
When pin EN1 or EN2 is low the AS1336 the corresponding boost converter is switched off and <1µA current is drawn
from battery; when pin EN1 or EN2 is high the corresponding device is switched on. If EN is driven from a logic-level
output, the logic high-level (on) should be referenced to V
Shutdown mode: The AS1336A disconnects the output completly from the input.
Low Battery Detection
The low-battery detector circuit can be used to supervise the battery voltage and to generate an error flag when the
battery voltage drops below a user-set threshold voltage. The function is active only when the device is enabled, if the
device is disabled, the LBO pin is high-impedance.
During normal operation, LBO stays at logic high when the voltage at LBI, is above 600mV. It is logic low when the volt-
age at LBI goes below 600 mV.
The battery voltage, at which the detection circuit switches, can be programmed with a resistive divider connected to
the LBI pin.
Where: V
Note: If the low-battery detection circuit is not used, the LBI pin should be connected to GND (or to V
www.austriamicrosystems.com/DC-DC_Step-Up/AS1336
quiescent current during powersave mode. Typical values for C
converter efficiency.
pin can be left unconnected. Do not let the LBI pin float. The LBI pin has a built-in hysteresis of 25mV.
DETECT
equals the threshold voltage for the battery voltage where a low battery flag should be signaled.
FF
) between pins VOUT and FB in some applications can reduce V
R
1 =
R
2
((V
DETECT
Revision 1.01
OUT
/ 600mV)-1)
to avoid intermittently switching the device on.
FF
range from 15 to 220pF.
OUTp-p
ripple and input
IN
) and the LBO
(EQ 2)
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