Data Sheet
FEATURES
50 mA/500 mA, Ultralow Power Step-Down
Regulator With Battery Voltage Monitor
ADP5303
TYPICAL APPLICATION CIRCUIT
V
IN
=
2.15V TO 6.50V
10µF
ON
OFF
EN
Input supply voltage range: 2.15 V to 6.50 V
Operates down to 2.00 V
Ultralow 240 nA quiescent current with no load
Selectable output voltages of 1.2 V to 3.6 V, or 0.8 V to 5.0 V
±1.5% output accuracy over the full temperature range in
pulse-width modulation (PWM) mode
Selectable hysteresis mode or PWM operation mode
Output current
Up to 50 mA in hysteresis mode
Up to 500 mA in PWM mode
VINOK flag to monitor input battery voltage
100% duty cycle operation mode
2 MHz switching frequency with optional synchronization
input from 1.5 MHz to 2.5 MHz
Quick output discharge (QOD) option
UVLO, OCP, and TSD protection
9-ball, 1.65 mm × 1.87 mm WLCSP
Junction temperature: −40°C to +125°C
2.2µH
PVIN
SW
V
OUT
ADP5303
(WLCSP-9)
10µF
PGND
PWM
HYS
SYNC/
MODE
VINOK
AGND
FB
VID0: 1.2V
VID1: 1.5V
VID2: 1.8V
VID3: 2.0V
R0 VID4: 2.1V
VID5: 2.2V
VID6: 2.3V
VID7: 2.4V
VID8: 2.5V
VID9: 2.6V
VID10: 2.7V
VID11: 2.8V
VID12: 2.9V
VID13: 3.0V
VID14: 3.3V
VID15: 3.6V
VID
Figure 1.
APPLICATIONS
Energy (gas, water) metering
Portable and battery-powered equipment
Medical applications
Keep-alive power supply
GENERAL DESCRIPTION
The
ADP5303
is high efficiency, ultralow quiescent current
step-down regulator that draws only 240 nA quiescent current
to regulate the output at no load.
The
ADP5303
runs from an input voltage of 2.15 V to 6.50 V,
allowing the use of multiple alkaline or NiMH cells, 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 a factory fuse. The total
solution requires only four tiny external components.
The
ADP5303
can operate between hysteresis mode and PWM
mode via the SYNC/MODE pin. In hysteresis mode, the regulator
achieves excellent efficiency at less than 1 mW and provides up
to 50 mA of output current. In PWM mode, the regulator 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 long battery
life and low system noise requirements.
The
ADP5303
integrates an ultralow power comparator with a
factory programmable voltage reference to monitor the input
battery voltage. The regulator runs at a 2 MHz switching frequency
in PWM mode and the SYNC/MODE pin can be synchronized
to an external clock from 1.5 MHz to 2.5 MHz.
Other key features in the
ADP5303
include separate enabling,
QOD, and safety features such as overcurrent protection (OCP),
thermal shutdown (TSD), and input undervoltage lockout
(UVLO).
The
ADP5303
is available in 9-ball, 1.65 mm × 1.87 mm
WLCSP package rated for the −40°C to +125°C junction
temperature range.
Rev. A
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13444-001
ADP5303
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Typical Application Circuit ............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Detailed Functional Block Diagram .............................................. 3
Specifications..................................................................................... 4
Absolute Maximum Ratings............................................................ 6
Thermal Resistance ...................................................................... 6
ESD Caution .................................................................................. 6
Pin Configuration and Function Descriptions ............................. 7
Typical Performance Characteristics ............................................. 8
Theory of Operation ...................................................................... 14
Buck Regulator Operational Modes......................................... 14
Oscillator and Synchronization ................................................ 14
Adjustable and Fixed Output Voltages .................................... 14
Undervoltage Lockout (UVLO) ............................................... 15
Enable/Disable ............................................................................ 15
Current Limit .............................................................................. 15
Data Sheet
Short-Circuit Protection............................................................ 15
Soft Start ...................................................................................... 15
Startup with Precharged Output .............................................. 15
100% Duty Cycle Operation ..................................................... 15
Active Discharge ......................................................................... 15
VINOK Function........................................................................ 15
Thermal Shutdown .................................................................... 15
Applications Information .............................................................. 16
External Component Selection ................................................ 16
Selecting the Inductor ................................................................ 16
Output Capacitor........................................................................ 16
Input Capacitor ........................................................................... 17
Efficiency ..................................................................................... 17
Printed Circuit Board Layout Recommendations ................. 18
Typical Application Circuits ......................................................... 19
Factory Programmable Options ................................................... 20
Outline Dimensions ....................................................................... 21
Ordering Guide .......................................................................... 21
REVISION HISTORY
6/2016—Rev. 0 to Rev. A
Change to Features Section and General Description
Section ................................................................................................ 1
Change to SYNC Clock Range Parameter, Table 1 ...................... 4
Change to Table 4 ............................................................................. 7
Change to Oscillator and Synchronization Section ................... 14
Changes to Table 8 .......................................................................... 20
10/2015—Revision 0: Initial Version
Rev. A | Page 2 of 21
Data Sheet
DETAILED FUNCTIONAL BLOCK DIAGRAM
VINOK
VINOK_TH
PVIN
I
LIM_PWM
PVIN
DRIVER
ADP5303
PVIN
SW
I
LIM_HYS
CONTROL
LOGIC
–0.6A(PWM)
0A(HYS)
PVIN
PWM
Σ
SLOPE
COMPENSATION
0.808V
0.8V
FB
DRIVER
PGND
STANDBY
V TO I
0.8V
INTERNAL
FEEDBACK
RESISTOR
DIVIDER
MODE
VID
1.2V
0.4V
EN
PVIN
UVLO
2.06V
2.00V
1.2V
0.4V
SYNC/
MODE
KEEP ALIVE BLOCK
SYNC
MODE
2MHz
OSC
BAND GAP BIAS
AND
HOUSEKEEPING
SOFT
START
AGND
Figure 2. Detailed Functional Block Diagram
Rev. A | Page 3 of 21
13444-002
ADP5303
ADP5303
SPECIFICATIONS
Data Sheet
V
IN
= 3.6 V, V
OUT
= 2.5 V, T
J
= −40°C to +125°C for minimum and maximum specifications, and T
A
= 25°C for typical specifications,
unless otherwise noted.
Table 1.
Parameter
INPUT SUPPLY VOLTAGE RANGE
SHUTDOWN CURRENT
QUIESCENT CURRENT
Operating Quiescent Current in Hysteresis
Mode
Symbol
V
IN
I
SHUTDOWN
Min
2.15
Typ
18
18
240
240
640
Operating Quiescent Current in PWM Mode
UNDERVOLTAGE LOCKOUT
UVLO Threshold
Rising
Falling
OSCILLATOR CIRCUIT
Switching Frequency in PWM Mode
Feedback (FB) Threshold of Frequency Fold
SYNCHRONIZATION THRESHOLD
1
SYNC Clock Range
SYNC High Level Threshold
SYNC Low Level Threshold
SYNC Duty Cycle Range
SYNC/MODE Leakage Current
MODE TRANSITION
Transition Delay from Hysteresis Mode to
PWM Mode
EN PIN
Input Voltage Threshold
High
Low
Input Leakage Current
FB PIN
Output Options by VID Resistor
PWM Mode
Fixed VID Code Voltage Accuracy
I
Q_PWM
UVLO
V
UVLO_RISING
V
UVLO_FALLING
f
SW
V
OSC_FOLD
SYNC
CLOCK
SYNC
HIGH
SYNC
LOW
SYNC
DUTY
I
SYNC_LEAKAGE
t
HYS_TO_PWM
425
Max
6.50
40
130
360
520
1500
630
Unit
V
nA
nA
nA
nA
nA
µA
Test Conditions/Comments
V
EN
= 0 V, −40°C ≤ T
J
≤ +85°C
V
EN
= 0 V, −40°C ≤ T
J
≤ +125°C
−40°C ≤ T
J
≤ +85°C
−40°C ≤ T
J
≤ +125°C
100% duty cycle operation, V
IN
= 3.0 V,
V
OUT
set to 3.3 V
I
Q_HYS
1.90
1.7
2.06
2.00
2.0
0.3
2.14
V
V
MHz
V
MHz
V
V
ns
nA
Clock
cycles
V
SYNC/MODE
= 3.6 V
SYNC/MODE goes logic high from
logic low
2.3
1.5
1.2
100
50
20
2.5
0.4
1/f
SW
−
150
150
V
IH
V
IL
I
EN_LEAKAGE
V
OUT_OPT
V
FB_PWM_FIX
1.2
0.4
25
0.8
−0.6
−1.2
−1.5
5.0
+0.6
+1.2
+1.5
V
V
nA
V
%
%
%
0.8 V to 5.0 V in various factory options
T
J
= 25°C, output voltage setting via
factory fuse
−40°C ≤ T
J
≤ +125°C
Output voltage setting via the VID
resistor
T
J
= 25°C
−40°C ≤ T
J
≤ +125°C
−40°C ≤ T
J
≤ +125°C
Adjustable VID Code Voltage Accuracy
Hysteresis Mode
Fixed VID Code Threshold Accuracy from
Active Mode to Standby Mode
Adjustable VID Code Threshold Accuracy
from Active Mode to Standby Mode
V
FB_PWM_ADJ
V
FB_HYS_FIX
−0.75
−2.5
−3
+0.75
+2.5
+3
%
%
%
V
FB_HYS_ADJ
Rev. A | Page 4 of 21
Data Sheet
Parameter
Hysteresis of Threshold Accuracy from
Active Mode to Standby Mode
Feedback Bias Current
SW PIN
High-Side Power FET On Resistance
Low-Side Power FET On Resistance
Current-Limit in PWM Mode
Peak Current in Hysteresis Mode
Minimum On Time
VINOK PIN
VINOK Monitor Threshold Range
VINOK Monitor Accuracy
VINOK Monitor Threshold Hysteresis
VINOK Rising Delay
VINOK Falling Delay
Leakage Current for VINOK Pin
Output Low Voltage for VINOK Pin
SOFT START
Default Soft Start Time
Start-Up Delay
C
OUT
DISCHARGE SWITCH ON RESISTANCE
THERMAL SHUTDOWN
Threshold
Hysteresis
1
ADP5303
Symbol
V
FB_HYS (HYS)
I
FB
Min
Typ
1
66
25
386
299
1000
265
40
Max
Unit
%
nA
nA
mΩ
mΩ
mA
mA
ns
V
%
%
%
µs
µs
µA
mV
µs
ms
Ω
°C
°C
Test Conditions/Comments
95
45
520
470
1200
70
5.15
+1.5
+3
Output Option 0, V
OUT
= 2.5 V
Output Option 1, V
OUT
= 1.3 V
Pin to pin measurement
Pin to pin measurement
SYNC/MODE = high
SYNC/MODE = low
R
DS (ON) H
R
DS (ON) L
I
LIM_PWM
I
LIM_HYS
t
MIN_ON
V
VINOK(RISE)
800
2.05
−1.5
−3
1.5
190
130
0.1
50
350
2
290
142
127
Factory programmable
T
J
= 25°C
−40°C ≤ T
J
≤ +125°C
V
VINOK(HYS)
t
VINOK_RISE
t
VINOK_FALL
I
VINOK_LEAKAGE
V
VINOK_LOW
t
SS
t
START_DELAY
R
DIS
T
SHDN
T
HYS
1
100
I
VINOK
= 100 µA
Factory trim, 1 bit (350 µs, 2800 µs)
Delay from the EN pin being pulled high
SYNC refers to the synchronization function of the multifunction SYNC/MODE pin only.
Rev. A | Page 5 of 21
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