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PDF ADP1828 Data sheet ( Hoja de datos )
| Número de pieza | ADP1828 | |
| Descripción | Step-Down DC-to-DC Controller | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ADP1828 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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Synchronouwwsw.DBatuaScheket4UP.cWom M,
Step-Down, DC-to-DC Controller
ADP1828
FEATURES
Wide bias voltage range 3.0 V to 18 V
Wide power stage input range 1 V to 24 V
Wide output voltage range: 0.6 V to 85% of input voltage
±0.85% accuracy at 0oC to 70oC
All N-channel MOSFET design for low cost
Fixed-frequency operation at 300 kHz, 600 kHz, or resistor
adjustable 300 kHz to 600 kHz
Clock output for synchronizing other controllers
No current sense resistor required
Internal linear regulator
Voltage tracking for sequencing
Soft start and thermal overload protection
Overvoltage and undervoltage power-good indicator
15 μA shutdown supply current
Available in a 20-lead QSOP
APPLICATIONS
Telecom and networking systems
Base station power
Set-top boxes, game consoles
Printers and copiers
Medical imaging systems
DSP and microprocessor core power supplies
DDR termination
GENERAL DESCRIPTION
The ADP1828 is a versatile and synchronous PWM voltage
mode buck controller. It drives an all N-channel power stage
R6
100kΩ
C2
33pF
C5
1µF
C7
1µF
C6
1µF
R8
20kΩ
C3
5.6nF
VREG PV
TRK BST
IN ADP1828 DH
EN
FREQ
SW
CSL
DL
SYNC
PGOOD
COMP
PGND
FB
CLKOUT
SS CLKSET
CSS
200nF
GND
AGND
to regulate an output voltage as low as 0.6 V to 85% of the input
voltage and is sized to handle large MOSFETs for point-of-load
regulators. The ADP1828 is ideal for a wide range of high power
applications, such as DSP and processor core I/O power, and
general-purpose power in telecommunications, medical imaging,
PC, gaming, and industrial applications. It operates from input
bias voltages of 3 V to 18 V with an internal LDO that generates
a 5 V output for input bias voltages greater than 5.5 V.
The ADP1828 operates at a pin-selectable, fixed switching
frequency of either 300 kHz or 600 kHz, or at any frequency
between 300 kHz and 600 kHz with a resistor. The switching
frequency can also be synchronized to an external clock up to
2× the part’s nominal oscillator frequency. The clock output
can be used for synchronizing additional ADP1828s (or the
ADP1829 controllers), thus eliminating the need for an external
clock source. The ADP1828 includes soft start protection to
limit any inrush current from the input supply during startup,
reverse current protection during soft start for a precharged
output, as well as a unique adjustable lossless current-limit
scheme utilizing external MOSFET RDSON sensing.
For applications requiring power-supply sequencing, the
ADP1828 provides a tracking input that allows the output
voltage to track during startup, shutdown, and faults. The
additional supervisory and control features include thermal
overload, undervoltage lockout, and power good.
The ADP1828 operates over the −40°C to +125°C junction
temperature range and is available in a 20-lead QSOP.
D1
C4
0.47µF
RCL
1.8kΩ
VIN = 10V TO 18V
CIN
180µF
×2
20V
M1
L1 = 0.82µH
COUT2
M2 1000µF
×2 ×2
AGND PGND
OUTPUT
1.8V, 20A
COUT1
47µF
R3
7.5kΩ
X5R
6.3V
R1
20kΩ
C1
680pF
R2
10kΩ
CfCSIOWNU: =TS2A:30SN0AYkNOHY,zOO,SPCOOSNC2A0PSP2R1850TMPD1000M5
L1: WURTH ELEKTRONIC, 0.82µH, 744355182
D1: BAT54
M1: INFINEON, BSC080N03LS
M2: INFINEON, 2 × BSC030N03LS
Figure 1. Typical Application Circuit with 20 A Output
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or 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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2007 Analog Devices, Inc. All rights reserved.
1 page  
ADP1828www.DataSheet4U.com
Parameter
POWER GOOD
FB Overvoltage Threshold
FB Overvoltage Hysteresis
FB Undervoltage Threshold
FB Undervoltage Hysteresis
PGOOD Propagation Delay
PGOOD Off Leakage Current
PGOOD Output Low Voltage
Conditions
VFB rising
VFB falling
VPGOOD = 5.5 V
IPGOOD = 10 mA
Min Typ Max Unit
700 750
50
500 550
50
8
150
810 mV
mV
585 mV
mV
μs
1 μA
500 mV
1 Connect IN to VREG when IN < 5.5 V. For applications with IN < 5.5V and IN not connected to VREG, keep in mind that VREG = VIN – dropout. VREG needs to be ≥ 3 V for
proper operation.
2 VRAMP = 1.0 V × fOSC/fSW, where fOSC is the natural oscillator frequency and fSW is the actual switching frequency. If SYNC is not used, then fOSC = fSW. If SYNC is used,
then fSW = fSYNC.
3 With a 5 V drive, the peak source or sink current could be up to 2.5 A and 3.3 A, respectively, when driving external power MOSFETs. The duration of the peak current
pulse is generally in the order of 10 ns.
4 Guaranteed by design and characterization. Not subject to production test.
Rev. 0 | Page 5 of 32
5 Page 
2.0
VIN = 3V TO 18V
1.5 fOSC = 300kHz OR 600kHz
REFERENCE POINT IS AT 25°C
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
–50
–25
0
25 50 75 100 125 150
TEMPERATURE (°C)
Figure 16. Δ fOSC vs. Temperature
6
TA = 25°C
5
4
3
2
1
0
25
8 11 14 17
VIN (V)
Figure 17. Supply Current vs. Input Voltage
20
T
SW
1
INPUT RIPPLE
2
OUTPUT RIPPLE
3
CH1 10.0V BW CH2 5.00V BW M 1.00µs
CH3 50.0mV BW
A CH1
6.40V
Figure 18. Input and Output Ripple of Figure 1, 22 A Load
ADP1828www.DataSheet4U.com
T
VOUT (AC-COUPLED)
1
STEP LOAD (5A TO 20A)
4
CH1 100mV
BW M 200µs
CH4 5.00A Ω
A CH4 8.20A
Figure 19. Load Transient Response of Figure 1, 5 A to 20 A, VIN = 12 V
T
SW
1
2
INPUT RIPPLE
3
OUTPUT RIPPLE
CH1 10.0V CH2 50.0mV BW M 1.00µs
CH3 10.0mV BW
A CH1
5.80V
Figure 20. Input and Output Ripple of Figure 54, 4 A Load
T
INPUT VOLTAGE (AC-COUPLED)
2
OUTPUT (AC-COUPLED)
3
4
STEP LOAD (1A TO 5A)
CH2 200mV BW M 200µs A CH4
CH3 100mV BW CH4 5.00A Ω
4.20A
Figure 21. Load Transient Response of Figure 54, 1 A to 5 A, VIN = 12 V
Rev. 0 | Page 11 of 32
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ADP1828.PDF ] | |
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