Change to Figure 6 ........................................................................... 8
Changes to Ordering Guide............................................................. 32
8/12—Rev. A to Rev. B
Change to Figure 62 ....................................................................... 17
Changes to Figure 63, Figure 64, Figure 65, and Figure 66 ............ 18
5/12—Rev. 0 to Rev. A
Changed Voltage Range for SW to PGND and Ground Plane
from −0.3 V to VIN + 0.3 V to −0.7 V to VIN + 0.3 V ............... 6
Changes to Ordering Guide .......................................................... 32
4/12—Revision 0: Initial Version
Rev. D | Page 2 of 32
Data Sheet
SPECIFICATIONS
ADP2370/ADP2371
V
IN
=
V
OUT
+ 1 V or 3.2 V, whichever is greater,
EN = V
IN
, I
OUT
= 100 mA, C
IN
= 10 μF, C
OUT
= 10 µF, T
A
= 25°C for typical specifications,
T
J
= −40°C to +125°C for minimum/maximum specifications, unless otherwise noted.
Table 1.
Parameter
SUPPLY
Input Voltage Range
Quiescent Current
Symbol
V
IN
I
Q-PSM
I
Q-PWM
I
SW-PWM
I
SHUT
I
OUT
V
OUT
Test Conditions/Comments
Min
3.2
FSEL = V
IN
, SYNC = 0 V, no load, device not
switching
FSEL = V
IN
, SYNC = V
IN
, no load, device not
switching
FSEL = V
IN
, SYNC = V
IN
, no load, device switching
EN = GND, T
J
= −40°C to +85°C
800
−1
−1.5
−3
0.8
Initial set point, I
OUT
= 250 mA, T
J
= 25°C
No load to full load
No load to full load
I
OUT
= 250 mA
I
OUT
= 250 mA, V
IN
= 7.2 V, V
OUT
= 3.3 V
% of V
OUT
, V
OUT
rising
% of V
OUT
, V
OUT
falling
V
IN
= 7.2 V, V
OUT
= 3.3 V
Fixed output voltage model
Adjustable output voltage model
V
IN
< 5.5 V
V
IN
> 5.5 V
When EN rises from 0 V to V
IN
, and V
OUT
= 0.9 × V
OUT
−1
0.8
0.125
0.01
92
50
37.5
170
2.5
10
65
40
350
260
+1
14
13.5
725
5.7
1.2
Typ
Max
15
Unit
V
μA
μA
mA
μA
mA
%
%
%
V
%
V
%/A
%/V
%
%
%
mA
μA
nA
ns
ns
μs
Ω
Shutdown Current
FIXED OUTPUT
Output Current
Fixed Output Accuracy
3.5
Initial set point, I
OUT
= 250 mA, T
J
= 25°C
I
OUT
= 250 mA
No load to full load, PWM mode
+1
+1.5
+3
ADJUSTABLE OUTPUT
Feedback Voltage
Feedback Voltage Accuracy
Output Voltage Range
FIXED AND ADJUSTABLE OUTPUT
Load Regulation
Line Regulation
Efficiency
Overcurrent Frequency Foldback Threshold
Rising
Falling
PSM Threshold
Feedback Pin Input Current
Fixed
Adjustable
Minimum On Time
Soft Start Time
Active Pull-Down Resistance
(ADP2371)
POWER SWITCH
P-Channel On Resistance
N-Channel On Resistance
Current Limit
P-Channel
N-Channel
Leakage Current
P-Channel
N-Channel
V
FB
V
FB-TOL
V
OUT-ADJ
∆V
OUT
/∆I
OUT
∆V
OUT
/∆V
IN
EFF
OC
FOLDBACK-RISE
OC
FOLDBACK-FALL
PSM
THRESHOLD
I
FB-FIXED
I
FB-ADJUST
ON-TIME
MIN
SS
TIME
R
PULL-DOWN
100
60
400
RDS
ON-P
RDS
ON-N
V
IN
> 5.5 V, I
OUT
= 400 mA
V
IN
< 5.5 V, I
OUT
= 400 mA
V
IN
> 5.5 V, I
OUT
= 400 mA
V
IN
< 5.5 V, I
OUT
= 400 mA
Peak inductor current
Peak inductor current
400
500
280
400
1200
500
0.01
0.01
1300
550
1
1
mΩ
mΩ
mΩ
mΩ
mA
mA
μA
μA
I
LIM-P
I
LIM-N
I
LEAK-SW
Rev. D | Page 3 of 32
ADP2370/ADP2371
Parameter
OSCILLATOR
Oscillator Frequency
Frequency Synchronization Range
Synchronization Threshold
High
Low
Hysteresis
Typical Sync Duty Cycle Range
SYNC Pin Leakage Current
FSEL Threshold
High
Low
Hysteresis
FSEL Pin Leakage Current
POWER GOOD (PG PIN)
PG Threshold
Rising
Falling
Hysteresis
PG Output Low
PG Delay
Rising
Falling
PG Leakage
UNDERVOLTAGE LOCKOUT (UVLO)
Input Voltage Rising
Input Voltage Falling
Hysteresis
ENABLE INPUT STANDBY (EN PIN)
EN Input Logic
High
Low
Hysteresis
ENABLE INPUT PRECISION (EN PIN)
EN Input Logic
High
Low
Hysteresis
EN Input Leakage Current
EN Input Delay Time
THERMAL SHUTDOWN
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
Symbol
f
OSC
f
SYNC_RANGE
Test Conditions/Comments
FSEL = V
IN
, 3.2 V ≤ V
IN
≤ 15 V
FSEL = 0 V, 3.2 V ≤ V
IN
≤ 15 V
FSEL = 0 V, 3.2 V ≤ V
IN
≤ 15 V
FSEL = V
IN
, 3.2 V ≤ V
IN
≤ 15 V
3.2 V ≤ V
IN
≤ 15 V
3.2 V ≤ V
IN
≤ 15 V
3.2 V ≤ V
IN
≤ 15 V
V
IN
(1.2 MHz), 3.2 V ≤ V
IN
≤ 5 V, FSEL = V
IN
V
IN
(1.2 MHz), 5 V ≤ V
IN
≤ 15 V, FSEL = V
IN
SYNC = 0 V or SYNC = V
IN
3.2 V ≤ V
IN
≤ 15 V
Min
1.0
500
400
0.8
1.2
Data Sheet
Typ
1.2
600
Max
1.4
700
800
1.6
Unit
MHz
kHz
kHz
MHz
V
V
mV
%
%
μA
V
V
mV
μA
SYNC
HIGH
SYNC
LOW
SYNC
HYS
SYNC
DUTY
SYNC
LKG
FESL
HIGH
FSEL
LOW
FSEL
HYS
FSEL
LKG
0.4
200
20
20
0.05
1
0.4
125
0.04
55
70
1
FSEL = 0 V or FSEL = V
IN
3.2 V ≤ V
IN
≤ 15 V
1
PG
RISE
PG
FALL
PG
HYS
PG
LOW
PG
DELAYRISE
PG
DELAYFALL
PG
LKG
UVLO
RISE
UVLO
FALL
UVLO
HYS
82.5
Pull-up current < 1 mA
V
OUT
crossing PG rising threshold, pull-up
current < 1 mA
V
OUT
crossing PG falling threshold, pull-up
current < 1 mA
92
87
5
95
0.3
20
0.5
0.04
1
3.19
2.80
190
%
%
%
V
μs
μs
μA
V
V
mV
V
3.2 V ≤ V
IN
≤ 15 V
EN
STBY-HIGH
EN
STBY-LOW
EN
STBY-HYS
3.2 V ≤ V
IN
≤ 15 V
EN
HIGH
EN
LOW
EN
HYS
I
EN-LKG
TI
EN-DLY
1.135
1.045
EN = V
IN
or GND
For V
OUT
= 0 V to 0.1 × V
OUT
when EN rises from
0 V to V
IN
3.2 V ≤ V
IN
≤ 15 V
T
J
rising
1.2
1.1
100
0.05
70
1.26
1.155
1
V
V
mV
µA
μs
1
0.4
125
V
mV
TS
SD
TS
SD-HYS
150
15
°C
°C
Rev. D | Page 4 of 32
Data Sheet
RECOMMENDED SPECIFICATIONS: CAPACITORS
Table 2.
Parameter
MINIMUM INPUT and OUTPUT CAPACITANCE
1
CAPACITOR ESR
1
ADP2370/ADP2371
Symbol
C
MIN
R
ESR
Test Conditions/Comments
T
A
= −40°C to +125°C
T
A
= −40°C to +125°C
Min
6.5
1
Typ
10
Max
10
Unit
µF
mΩ
The minimum input and output capacitance should be greater than 7 μF over the full range of operating conditions. The full range of operating conditions in the
application must be considered during device selection to ensure that the minimum capacitance specification is met. X7R- and X5R-type capacitors are recommended;
Y5V and Z5U capacitors are not recommended for use with any buck.
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Embedded System
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