50 mA/500 mA, High Efficiency, Ultralow
Power Step-Down Regulator
ADP5300
Data Sheet
FEATURES
TYPICAL APPLICATION CIRCUIT
2.2µH
Input supply voltage range: 2.15 V to 6.50 V
Operates down to 2.00 V voltage
V
= 2.15 TO 6.50V
V
IN
OUT
PVIN
SW
10µF
ADP5300
Ultralow 180 nA quiescent current
Selectable output voltage of 0.8 V to 5.0 V
1.5ꢀ output accuracy over full temperature range in
PWM mode
10µF
ON
OFF
PGND
EN
PWM
HYS
FB
SYNC/MODE
STOP
SW
VID0: 1.2V VID8: 2.5V
VID1: 1.5V VID9: 2.6V
VID2: 1.8V VID10: 2.7V
VID3: 2.0V VID11: 2.8V
VID4: 2.1V VID12: 2.9V
VID5: 2.2V VID13: 3.0V
VID6: 2.3V VID14: 3.3V
VID7: 2.4V VID15: 3.6V
Selectable hysteresis mode or PWM operation mode
Output current
Up to 50 mA in hysteresis mode
VOUTOK
STOP
AGND
VID
R0
EPAD
Up to 500 mA in PWM mode
VOUTOK flag monitors the output voltage
Ultrafast stop switching control
Figure 1.
100ꢀ duty cycle operation mode
2.0 MHz typical switching frequency in PWM mode with
optional SYNC clock range from 1.2 MHz to 2.5 MHz
Quick output discharge (QOD) option
UVLO, OCP, and TSD protection
10-lead, 3 mm × 3 mm LFCSP
−40°C to +125°C operating temperature range
APPLICATIONS
Energy (gas and water) metering
Portable and battery-powered equipment
Medical applications
Keep-alive power supplies
GENERAL DESCRIPTION
The ADP5300 is a high efficiency, ultralow quiescent current
step-down regulator that draws only 180 nA quiescent current
to regulate the output.
The ADP5300 contains a VOUTOK flag, which monitors the
output voltage and runs at a 2 MHz switching frequency in
PWM mode. SYNC/MODE can be synchronized to an external
clock from 1.2 MHz to 2.5 MHz.
The ADP5300 runs from an input supply voltage range of 2.15 V
to 6.50 V, allowing the use of multiple alkaline or NiMH, Li-Ion
cells, or other power sources. The output voltage is selectable from
0.8 V to 5.0 V by an external VID resistor and factory fuse. The
total solution requires only four tiny external components.
The ADP5300 includes an STOP pin that can disable the regulator
switching temporarily, in this way a quiet system environment
can be achieved to benefit noise sensitive circuitry, such as data
conversion, RF data transmisson, and analog sensing.
The ADP5300 can operate between hysteresis mode and pulse-
width modulation (PWM) mode via the SYNC/MODE pin. The
regulator in hysteresis mode achieves excellent efficiency at a
power of less than 1 mW and provides up to 50 mA of output
current. The regulator in PWM mode produces a lower output
ripple and supplies up to 500 mA of output current. The flexible
configuration capability during operation of the device enables
very efficient power management to meet both the longest battery
life and low system noise requirements.
Other key features in the ADP5300 include separate enabling,
QOD, and safety features such as overcurrent protection (OCP),
thermal shutdown (TSD), and input undervoltage lockout (UVLO).
The ADP5300 is available in a 10-lead, 3 mm × 3 mm LFCSP
rated for a −40°C to +125°C operating temperature range.
Multifunction pin names may be referenced by their relevant
function only.
Rev. 0
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