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PDF ADP1851 Data sheet ( Hoja de datos )
| Número de pieza | ADP1851 | |
| Descripción | Step-Down DC-to-DC Controller | |
| Fabricantes | Analog Devices | |
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Data Sheet
FEATURES
Input voltage range: 2.75 V to 20 V
Output voltage range: 0.6 V to 90% VIN
Maximum output current of more than 25 A
Current mode architecture
Configurable to voltage mode
±1% output voltage accuracy over temperature
Voltage tracking
Programmable frequency: 200 kHz to 1.5 MHz
Synchronization input
Power saving mode at light load
Precision enable input
Power good with internal pull-up resistor
Adjustable soft start
Programmable current sense gain
Integrated bootstrap diode
Starts into a precharged load
Externally adjustable slope compensation
Suitable for any output capacitor
Overvoltage and overcurrent-limit protection
Thermal overload protection
Input undervoltage lockout (UVLO)
Available in 16-lead, 4 mm × 4 mm LFCSP
Supported by ADIsimPower design tool
APPLICATIONS
Intermediate bus and POL systems requiring sequencing and
tracking, including
Telecom base station and networking
Industrial and instrumentation
Medical and healthcare
GENERAL DESCRIPTION
The ADP1851 is a wide range input, dc-to-dc, synchronous
buck controller capable of running from commonly used 3.3 V
to 12 V (up to 20 V) voltage inputs. The device nominally
operates in current mode with valley current sensing providing
the fastest step response for digital loads. It can also be config-
ured as a voltage mode controller with low noise and crosstalk
for sensitive loads.
The ADP1851 is ideal in system applications requiring multiple
output voltages. The ADP1851 includes a synchronization feature
to eliminate beat frequencies between switching devices. It also
provides accurate tracking capability between supplies and includes
precision enable and power-good functions for simple, robust
sequencing.
Rev. A
Document Feedback
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responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
Wide Range Input, Synchronous,
Step-Down DC-to-DC Controller
ADP1851
TYPICAL OPERATION CIRCUIT
RRAMP
VIN
HIGH
LOW
RAMP VIN
EN
DH
BST
VCCO
SW
ILIM
FB
ADP1851
SYNC
DL
PGND
FREQ
SS/TRK COMP
PGOOD
AGND (EP)
M1 L
RCSG
M2
VOUT
Figure 1.
The ADP1851 provides a high speed, high peak current gate
driving capability to enable energy efficient power conversion.
The device can be configured to operate in power saving mode
by skipping pulses, reducing switching losses, and improving
efficiency at light load and standby conditions.
The accurate current limit allows design within a narrower
range of tolerances and can reduce overall converter size and
cost. The ADP1851 can regulate down to 0.6 V output using a
high accuracy reference with ±1% tolerance over the
temperature range of −40°C to +125°C.
With its wide range input voltage, the ADP1851 provides the
designer with maximum flexibility for use in a variety of system
configurations; loop compensation, soft start, frequency setting,
power saving mode, current limit, and current sense gain can all
be programmed using external components. In addition, the
external RAMP resistor allows the selection of optimal slope
and VIN feedforward in both current and voltage modes for
excellent line rejection. The linear regulator and the bootstrap
diode for the high-side driver are internal.
Protection features include undervoltage lockout, overvoltage,
overcurrent/short circuit, and overtemperature.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2012–2017 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
ADP1851
Data Sheet
SPECIFICATIONS
All limits at temperature extremes, TJMIN and TJMAX, are guaranteed via correlation using standard statistical quality control (SQC). VIN =
12 V. The specifications are valid for TJ = −40°C to +125°C, unless otherwise specified. Typical values are at TA = 25°C.
Table 1.
Parameter
POWER SUPPLY
Input Voltage
Undervoltage Lockout Threshold
Undervoltage Lockout Hysteresis
Quiescent Current
Shutdown Current
ERROR AMPLIFIER
FB Input Bias Current
Open-Loop Gain1
Gain Bandwidth Product1
CURRENT SENSE AMPLIFIER GAIN
OUTPUT CHARACTERISTICS
Feedback Accuracy Voltage
Line Regulation of PWM
Load Regulation of PWM1
OSCILLATOR
Frequency
SYNC Input Frequency Range1
SYNC Input Pulse Width1
SYNC Pin Capacitance to AGND
LINEAR REGULATOR
VCCO Output Voltage
VCCO Load Regulation
VCCO Line Regulation
VCCO Current Limit1
VCCO Short-Circuit Current1
VIN to VCCO Dropout Voltage2
LOGIC INPUTS
EN Threshold Voltage
EN Hysteresis
EN Input Leakage Current
Symbol
VIN
UVLOTRSH
UVLOHYST
IIN
IIN_SD
IFB
Test Conditions/Comments
VIN rising
VIN falling
EN = VIN = 12 V, VCOMP = 0.6 V in forced pulse-
width modulation (PWM) mode (not
switching), SYNC = VCCO
EN = VIN = 12 V, VCOMP = 0.6 V in PSM mode,
SYNC = AGND
EN = AGND, VIN = 5.5 V or 20 V
ACS Current sense gain resistor connected
between DL and PGND, RCSG = 47 kΩ ± 5%
Current sense gain resistor connected
between DL and PGND, RCSG = 22 kΩ ± 5%
Default setting, RCSG = open
Voltage mode operation, resistor connected
between DL and PGND, RCSG = 100 kΩ ± 5%
VFB
ΔVFB/ΔVIN
ΔVFB/ΔVCOMP
TJ = −40°C to +85°C
TJ = −40°C to +125°C
VCOMP range = 0.9 V to 2.2 V
fOSC
fSYNC
tSYNCMIN
CSYNC
RFREQ = 332 kΩ to AGND
RFREQ = 78.7 kΩ to AGND
RFREQ = 40.2 kΩ to AGND
FREQ connected to AGND
FREQ connected to VCCO
RFREQ range from 332 kΩ to 40.2 kΩ
VDROPOUT
IVCCO = 100 mA
IVCCO = 0 mA to 100 mA
VIN = 5.5 V to 20 V, IVCCO = 20 mA
VCCO drops to 4 V from 5 V
VCCO < 0.5 V
IVCCO = 100 mA, VIN ≤ 5 V
EN rising
IEN VIN = 2.75 V to 20 V
Min
2.75
2.55
2.35
−100
2.6
5.2
10.5
597
594
170
720
1275
240
480
170
100
4.7
0.57
Typ Max
20
2.65 2.75
2.45 2.50
0.2
4.2 5.7
2.5
100 200
+1 +100
80
20
3 3.4
6 6.8
12 13.5
0
600
600
±0.015
±0.3
603
606
200
800
1500
300
600
230
880
1725
360
720
1725
5
5.0 5.3
35
10
350
370 400
0.33
0.63 0.68
0.03
1 200
Unit
V
V
V
V
mA
mA
µA
nA
dB
MHz
V/V
V/V
V/V
V/V
mV
mV
%/V
%
kHz
kHz
kHz
kHz
kHz
kHz
ns
pF
V
mV
mV
mA
mA
V
V
V
nA
Rev. A | Page 4 of 24
5 Page 
ADP1851
SYNC
1
DH
3
DL
4
CH1 5V BW
CH3 10V BW
CH4 5V BW
M 1.0µs 250MS/s A CH1 3.1V
4ns/pt
Figure 10. Synchronization, fSYNC = 600 kHz
35
VIN = 12V
34 OUTPUT IS LOADED
HS FET = BSC080N03LS
33 LS FET = BSC030N03LS
32
31
30
29
28
27
26 DEAD TIME BETWEEN SW FALLING EDGE
25 AND DL RISING EDGE, INCLUDING DIODE RECOVERY TIME
–40 –20 0
20 40 60 80 100 120 140
TEMPERATURE (°C)
Figure 11. Dead Time vs. Temperature
350
300
DH MINIMUM OFF TIME
250
200
150
100
DH MINIMUM ON TIME
50
2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0
VIN (V)
Figure 12. Typical DH Minimum On Time and Off Time
Data Sheet
EN
1
SW
3
VOUT
2
CH1 1V BW
CH3 10V BW
CH2 500mV BW M 2ms 250kS/s A CH1
4µs/pt
580mV
Figure 13. Soft Start with Precharged Output, 1.8 VOUT Forced PWM Mode
45
TA = 25°C
43 OUTPUT IS LOADED
HS FET = BSC080N03LS
41 LS FET = BSC030N03LS
39
37
35
33
31
29
27 DEAD TIME BETWEEN SW FALLING EDGE
25 AND DL RISING EDGE, INCLUDING DIODE RECOVERY TIME
0 5 10 15 20
VIN (V)
Figure 14. Dead Time vs. VIN
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
–40
VIN = 2.75V, SOURCING
VIN = 12V, SOURCING
VIN = 2.75V, SINKING
VIN = 12V, SINKING
–15 10 35 60 85 110
TEMPERATURE (°C)
Figure 15. Driver Resistance vs. Temperature
135
Rev. A | Page 10 of 24
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet ADP1851.PDF ] | |
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