TS32101 Datasheet, PDF (6/12 Pages) List of Unclassifed Manufacturers – High Efficiency DC/DC Boost Converter for USB, 2Mhz

TS32101
Version 2.0
BOOST CONVERTER CHARACTERISTICS
Electrical Characteristics, TA = -40C to 85C, VIN = 2.4V, VOUT = 5.0V (unless otherwise noted)
Symbol
Parameter
Condition
Min
Boost Regulator: L=1.0uH and C=44uF
VOUT
Output Voltage
3.0
VFB
Feedback Voltage
1.175
RDSON
High Side Switch On Resistance
Low Side Switch On Resistance
ISW = -1A, TJ=25C
ISW = 1A, TJ=25C
IOCD
Over Current Detect
LS switch current
3
VISEN
Output Current Threshold Voltage
VOUT-OV
VOUT Over Voltage Threshold
101
DUTYMAX
Max Duty Cycle
Typ Max Unit
5.5
V
1.2 1.225 V
120
mΩ
50
mΩ
A
23
mV
102 103 %VOUT
85
%
FUNCTIONAL DESCRIPTION
The TS32101 is a fully-integrated, low-voltage synchronous boost converter IC based on a highly-efficient switching topology. It
is optimized to be powered from NiMH or Li-Ion batteries and includes features to make it suitable for powering portable
equipment as an emergency power/charging source. A 2MHz internal switching frequency yields a good balance between
efficiency and the ability to use small, low-cost LC filter components.
INTERNAL PROTECTION DETAILS
Internal Current Limit
The current through the low side switch is sensed on a cycle by cycle basis and if current limit is reached, it will abbreviate the
cycle. Current limit is always active when the boost converter is enabled.
Adjustable Output Current Limit
The TS32101 has an adjustable output current limit that is implemented by sensing the voltage across an external resistor
placed in series with the output. The voltage across this resistor is continuously monitored with no output current limit
occurring until the output current is large enough to produce a voltage drop of 23mV across the sense resistor. If the voltage
drop across the sense resistor reaches 23mV the TS32101 will reduce the duty cycle to limit the output current and result in a
constant output current limit. This feature can be disabled by connecting the ISEN to VOUT and removal of the sense resistor.
Adjustable Output Voltage
The TS32101 has an adjustable output voltage selected by an external resistor divider in the feedback loop. To change the
output voltage, replace resistors RTOP and RBOT with values from the following equation:
VOUT = 1.2 * (1 + RTOP / RBOT)
Power Good
The PG signal provides the ability to monitor fault conditions and power supply sequencing. The PG output is valid high when
the TS32101 is enabled, the input voltage is above the VIN under-voltage threshold, the output voltage is above 90% of the
desired value, and the device is not in thermal shutdown.
The PG output can be utilized for power supply sequencing. When the device is operating normally and the output voltage is
above 90% of the desired value, the PG output will be high. A 100us deglitch timer is used to insure that the PG signal does not
respond to noise or transients.
Thermal Shutdown
If the temperature of the die exceeds 150C (typical), the VSW outputs will tri-state to protect the device from damage. The PG
and all other protection circuitry will stay active to inform the system of the failure mode. Once the device cools to 140C
(typical), the device will attempt to start up again. If the device reaches 150C, the shutdown/restart sequence will repeat. The
PG output will be pulled low in this condition.
Specifications subject to change
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