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ADP1864 Datasheet(PDF) 3 Page - Analog Devices

No. de Pieza. ADP1864
Descripción  Constant Frequency Current-Mode Step-Down DC/DC Controller in TSOT
Descarga  16 Pages
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Fabricante  AD [Analog Devices]
Página de inicio  http://www.analog.com
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ADP1864 Datasheet(HTML) 3 Page - Analog Devices

 
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ADP1864
Rev. 0 | Page 3 of 16
SPECIFICATIONS
VIN = 5 V, TA = 25°C, unless otherwise noted.
Table 1.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
POWER SUPPLY
Input Voltage
VIN
3.15
14
V
Quiescent Current
IQ
VIN = 3.15 V to 14 V, GATE = IN
235
350
μA
Shutdown Supply Current
ISD
VIN = 3.15 V to 14 V, COMP = GND
7
15
μA
Undervoltage Lockout Threshold
VUVLO
VIN falling, TA = −40°C to +85°C
2.75
2.90
3.01
V
VIN rising, TA = −40°C to +85°C
2.85
3.00
3.10
V
ERROR AMPLIFIER
FB Input Current
IFB
VFB = 0.8 V
−20
-2
20
nA
FB Input Current
IFB
VFB = 0.8 V, TA = −40°C to +85°C
−35
-2
35
nA
Amplifier Transconductance
VFB = 0.8 V, ICOMP = ±5 μA
0.24
mS
COMP Startup Threshold
VIN = 3.15 V to 14 V , TA = −40°C to +85°
0.55
0.67
0.80
V
COMP Shutdown Threshold
VIN = 3.15 V to 14 V , TA = −40°C to +85°
0.15
0.3
0.55
V
COMP Startup Current Source
COMP = GND
0.25
0.6
0.85
μA
FB Regulation Voltage
VIN = 3.15 V to 14 V , TA = −40°C to +85°
0.790
0.8
0.810
V
Overvoltage Protection Threshold
VOVP
Measured at FB
0.87
0.885
0.9
V
Overvoltage Protection Hysteresis
50
mV
CURRENT SENSE
Peak Current Sense Voltage
TA = −40°C to +85°C
90
125
mV
Peak Current Sense Voltage
VIN = 3.15 V to 14 V, TA = −40°C to +85°C
80
125
mV
Current Sense Gain
VCS to VCOMP
12
V/V
OUTPUT REGULATION
Line Regulation1
VIN = 3.15 V to 14 V, VFB/VIN
0.12
mV/V
Load Regulation2
VFB/VCOMP
−2
mV/V
OSCILLATOR
Oscillator Frequency
VFB = 0.8 V
500
580
650
kHz
VFB = 0 V
190
kHz
FB Frequency Foldback Threshold
0.35
V
GATE DRIVE
Gate Rise Time
CGATE = 3 nF
50
ns
Gate Fall Time
CGATE = 3 nF
40
ns
Minimum On Time
PGATE minimum low duration
190
ns
SOFT START POWER-ON TIME
1.1
ms
1 Line regulation is measured with the application circuit of Figure 1. Line regulation is specified as being the change in the FB voltage resulting from a 1 V change in the
IN voltage.
2 Load regulation is measured using the application circuit from Figure 1. Load regulation is specified as the change in the FB voltage resulting from a 1 V change in
COMP voltage. The COMP voltage range is typically 0.9 V to 2.3 V for the minimum to maximum load current condition.


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