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ADP1972ARUZ-R7

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
Data Sheet ADP1972
Rev. B | Page 3 of 18
SPECIFICATIONS
VIN = 24 V and the specifications are valid for T
J
= −40°C to +125°C, unless otherwise specified. Typical values are at T
A
= 25°C.
All limits at temperature extremes are guaranteed via correlation using standard statistical quality control (SQC).
Table 1.
Parameter Symbol Test Conditions/Comments Min Typ Max Unit
INPUT VOLTAGE (VIN)
Voltage Range V
IN
6 60 V
VIN Supply Current I
VIN
R
FREQ
= 100 kΩ, V
SS
= 0 V, SYNC floating 1.5 2.5 mA
VIN Shutdown Current I
SHDN
V
EN
= 0 V 15 70 μA
UVLO Threshold Rising V
IN
rising 5.71 6 V
UVLO Threshold Falling V
IN
falling 5.1 5.34 V
SOFT START (SS)
SS Pin Current I
SS
V
SS
= 0 V 4 5 6 μA
SS Threshold Rising 0.52 0.65 V
SS Threshold Falling 0.4 0.5 V
PWM CONTROL
FREQ
Frequency Range f
SET
50 300 kHz
Oscillator Frequency f
OSC
R
FREQ
= 100 kΩ 90 100 110 kHz
FREQ Pin Voltage V
FREQ
R
FREQ
= 100 kΩ 1.2 1.252 1.3 V
SYNC
Maximum SYNC Pin Voltage 5.5 V
SYNC Pull-Down Resistor 0.5 1 1.5 MΩ
SYNC Output (Internal Frequency Control) V
SCFG
≥ 4.53 V or SCFG pin floating
Internal SYNC Range f
SET
For SYNC output 50 300 kHz
SYNC Output Clock Duty Cycle V
SCFG
= V
VREG
, R
FREQ
= 100 kΩ 40 50 60 %
SYNC Sink Resistance R
SYNC
V
SCFG
= 5 V, I
SYNC
= 10 mA 10 20 Ω
SYNC Input (External Frequency Control) V
SCFG
< 4.25 V
External SYNC Range f
SYNC
For SYNC input clock 50 300 kHz
SYNC Threshold Rising 1.2 1.5 V
SYNC Threshold Falling 0.7 1.05 V
R
FREQ
Slave to Master Ratio for Synchronization For example, R
FREQ
(SLAVE)
= 1.11 × R
FREQ
(MASTER)
1.11
SCFG V
SCFG
SCFG High Threshold Rising 4.53 4.7 V
SCFG High Threshold Falling 4.25 4.51 V
SCFG Low Threshold Rising 0.52 0.65 V
SCFG Low Threshold Falling 0.4 0.5 V
SCFG Current I
ISCFG
R
FREQ
= 100 kΩ 9.5 11 12.5 μA
DMAX
Maximum Internal Duty Cycle V
COMP
, V
DMAX
, V
SS
, and V
SCFG
= 5 V 97.37 %
DMAX Setting Current I
DMAX
V
DMAX
= 0 V, R
FREQ
= 100 kΩ 9.5 11 12.5 μA
DMAX and SCFG Current Matching
1
10 %
COMP
Maximum COMP Pin Voltage V
COMP
5 V
Internal Peak-to-Peak Ramp Voltage V p-p 4 V
COMP Maximum Internal Ramp Voltage 4.5 V
COMP Minimum Internal Ramp Voltage Internal oscillator is disabled 0.45 0.5 0.55 V
DH and DL Shutdown Range
2
V
COMP
COMP not regulated 0.45 V
Maximum Duty Cycle Range
2
V
COMP
4.4 V
ADP1972 Data Sheet
Rev. B | Page 4 of 18
Parameter Symbol Test Conditions/Comments Min Typ Max Unit
PRECISION ENABLE LOGIC (EN)
Maximum EN Pin Voltage 60 V
EN Threshold Rising 1.25 1.4 V
EN Threshold Falling 1.1 1.22 V
EN Pin Current V
EN
= 5 V 0.32 2 μA
MODE LOGIC
Maximum MODE Pin Voltage 5.5 V
MODE Threshold Rising 1.20 1.5 V
MODE Threshold Falling 0.7 1.05 V
CURRENT LIMIT (CL)
Set Current I
CL
V
CL
= 0 V 18 20 21 μA
Buck Internal Reference V
REF (BUCK)
250 300 350 mV
Boost Internal Reference V
REF (BOOST)
450 500 550 mV
Hiccup Detect Time R
FREQ
= 100 kΩ 4.4 5.2 6.1 ms
Hiccup Off-Time R
FREQ
= 100 kΩ 4.4 5.2 6.1 ms
VREG
LDO Regulator Output Voltage V
VREG
V
IN
= 6 V to 60 V 4.9 5 5.1 V
Guaranteed Output Current I
OUT (MAX)
V
IN
= 6 V 5 mA
Line Regulation V
IN
= 6 V to 60 V 5 5.1 V
Load Regulation V
IN
= 6 V, I
OUT
= 0 mA to 5 mA 5 5.1 V
FAULT
Maximum FAULT Pin Voltage 60 V
FAULT Threshold Rising 1.2 1.5 V
FAULT Threshold Falling 0.7 1.05 V
FAULT Pin Current V
FAU LT
= 5 V 0.49 2 μA
PWM DRIVE LOGIC SIGNALS (DH/DL)
DL Drive Voltage V
DL
No load VREG V
DH Drive Voltage V
DH
No load VREG V
DL and DH Sink Resistance I
DL
= 10 mA 1.2 2.4 Ω
DL and DH Source Resistance I
DL
= 10 mA 1.4 2.6 Ω
DL and DH Pull-Down Resistor 0.5 1 1.5 MΩ
THERMAL SHUTDOWN (TSD)
TSD Threshold Rising 150 °C
TSD Threshold Falling 135 °C
1
The DMAX and SCFG current matching specification is calculated by taking the absolute value of the difference between the measured I
SCFG
and I
DMAX
currents, dividing
them by the 11 μA typical value, and multiplying this answer by 100.
100
μA11
(%)
DMAXSCFG
II
t MatchingCFG CurrenDMAX and S
2
See Figure 11 for a graph of the duty cycle vs. the applied COMP pin voltage.
Data Sheet ADP1972
Rev. B | Page 5 of 18
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Rating
VIN, EN, FAULT to GND −0.3 V to +61 V
SYNC, COMP, MODE to GND −0.3 V to +5.5 V
DH, DL, SS, DMAX, SCFG, CL to GND −0.3 V to VREG + 0.3 V
GND
SENSE
to GND −0.3 V to +0.3 V
Operating Ambient Temperature Range −40°C to +85°C
Junction Temperature 125°C
Storage Temperature Range −65°C to +150°C
Stresses at or above those listed under Absolute Maximum
Ratings may cause permanent damage to the product. This is a
stress rating only; functional operation of the product at these
or any other conditions above those indicated in the operational
section of this specification is not implied. Operation beyond
the maximum operating conditions for extended periods may
affect product reliability.
Absolute maximum ratings apply individually only, not in
combination.
THERMAL OPERATING RANGES
The ADP1972 can be damaged when the junction temperature
limits are exceeded. The maximum operating junction
temperature (T
J
MAX
) takes precedence over the maximum
operating ambient temperature (T
A
MAX
). Monitoring ambient
temperature does not guarantee that the junction temperature
(T
J
) is within the specified temperature limits.
In applications with high power dissipation and poor printed
circuit board (PCB) thermal resistance, the maximum ambient
temperature may need to be derated. In applications with
moderate power dissipation and low PCB thermal resistance,
the maximum ambient temperature can exceed the maximum
limit when the junction temperature is within specification
limits.
The junction temperature (T
J
) of the device is dependent on the
ambient temperature (T
A
), the power dissipation of the device (P
D
),
and the junction to ambient thermal resistance of the package (θ
JA
).
Use the following equation to calculate the maximum junction
temperature (T
J
) from the ambient temperature (T
A
) and power
dissipation (P
D
):
T
J
= T
A
+ (P
D
× θ
JA
) (1)
For additional information on thermal resistance, refer to
Application Note AN-000, Thermal Characteristics of IC
Assembly.
ESD CAUTION
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

ADP1972ARUZ-R7

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Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Controllers GSM Power Management System
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