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ADP1878 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 ADP1878
기능 Synchronous Buck Controller
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ADP1878 데이터시트, 핀배열, 회로
Data Sheet
Synchronous Buck Controller with
Constant On Time and Valley Current Mode
ADP1878/ADP1879
FEATURES
Power input voltage range: 2.95 V to 20 V
On-board bias regulator
Minimum output voltage: 0.6 V
0.6 V reference voltage with ±1.0% accuracy
Supports all N-channel MOSFET power stages
Available in 300 kHz, 600 kHz, and 1.0 MHz options
No current sense resistor required
Power saving mode (PSM) for light loads (ADP1879 only)
Resistor programmable current limit
Power good with internal pull-up resistor
Externally programmable soft start
Thermal overload protection
Short-circuit protection
Standalone precision enable input
Integrated bootstrap diode for high-side drive
Starts into a precharged output
Available in a 14-lead LFCSP_WD package
APPLICATIONS
Telecommunications and networking systems
Mid-to-high end servers
Set-top boxes
DSP core power supplies
GENERAL DESCRIPTION
The ADP1878/ADP1879 are versatile current-mode, synchronous
step-down controllers. They provide superior transient response,
optimal stability, and current-limit protection by using a constant
on time, pseudo fixed frequency with a programmable current-limit,
current control scheme. These devices offer optimum performance
at low duty cycles by using a valley, current-mode control architec-
ture allowing the ADP1878/ADP1879 to drive all N-channel power
stages to regulate output voltages to as low as 0.6 V.
The ADP1879 is the power saving mode (PSM) version of the
device and is capable of pulse skipping to maintain output
regulation while achieving improved system efficiency at light
loads (see the ADP1879 Power Saving Mode (PSM) section for
more information).
Available in three frequency options (300 kHz, 600 kHz, and
1.0 MHz) plus the PSM option, the ADP1878/ADP1879 are well
suited for a wide range of applications that require a single input
power supply range from 2.95 V to 20 V. Low voltage biasing is
supplied via a 5 V internal low dropout regulator (LDO). In
addition, soft start programmability is included to limit input
inrush current from the input supply during startup and to
provide reverse current protection during precharged output
Rev. A
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.
TYPICAL APPLICATIONS CIRCUIT
VIN = 2.95V TO 20V
CC
RC CC2
VREG
VOUT
10k
RTOP
RBOT
CVREG2
CVREG
RRES
VIN
ADP1878/
ADP1879
COMP
BST
EN
FB
GND
VREG
DRVH
SW
DRVL
RES
PGOOD
SS
PGND
CIN
CBST
Q1 L
COUT
Q2
RPGD
VEXT
CSS
VOUT
LOAD
Figure 1.
conditions. The low-side current sense, current gain scheme and
integration of a boost diode, together with the PSM/forced
pulse-width modulation (PWM) option, reduce the external
device count and improve efficiency.
The ADP1878/ADP1879 operate over the −40°C to +125°C
junction temperature range and are available in a 14-lead
LFCSP_WD package.
100
95 VIN = 5V (PSM)
90
85
80
75
70 VIN = 16.5V
65
60 VIN = 13V
55 VIN = 13V (PSM)
50
45
40 VIN = 16.5V (PSM)
35
30
25
10
100
TA = 25°C
fVSOWUT=
= 1.8V
300kHz
WÜRTH INDUCTOR:
744325120, L = 1.2µH, DCR = 1.8m
INFINEON FETs:
BSC042N03MS G (UPPER/LOWER)
1k 10k 100k
LOAD CURRENT (mA)
Figure 2. ADP1878/ADP1879 Efficiency vs. Load Current (VOUT = 1.8 V, 300 kHz)
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 ©2011–2012 Analog Devices, Inc. All rights reserved.




ADP1878 pdf, 반도체, 판매, 대치품
ADP1878/ADP1879
Data Sheet
Parameter
ADP1878ACPZ-0.6-R7/
ADP1879ACPZ-0.6-R7
On Time
Minimum On Time
Minimum Off Time
ADP1878ACPZ-1.0-R7/
ADP1879ACPZ-1.0-R7
On Time
Minimum On Time
Minimum Off Time
OUTPUT DRIVER CHARACTERISTICS
High-Side Driver
Output Source Resistance
Output Sink Resistance
Rise Time2
Fall Time2
Low-Side Driver
Output Source Resistance
Output Sink Resistance
Rise Time2
Fall Time2
Propagation Delays
DRVL Fall to DRVH Rise2
DRVH Fall to DRVL Rise2
SW Leakage Current
Integrated Rectifier
Channel Impedance
PRECISION ENABLE THRESHOLD
Logic High Level
Enable Hysteresis
COMP VOLTAGE
COMP Clamp Low Voltage
COMP Clamp High Voltage
COMP Zero Current Threshold
THERMAL SHUTDOWN
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
CURRENT LIMIT
Hiccup Current-Limit Timing
OVERVOLTAGE AND POWER-
GOOD THRESHOLDS
FB Power-Good Threshold
FB Power-Good Hysteresis
FB Overvoltage Threshold
FB Overvoltage Hysteresis
PGOOD Low Voltage During Sink
PGOOD Leakage Current
Symbol Test Conditions/Comments
VIN = 5 V, VOUT = 2 V, TJ = 25°C
VIN = 20 V, VOUT = 0.8 V
65% duty cycle (maximum)
VIN = 5 V, VOUT = 2 V, TJ = 25°C
VIN = 20 V
45% duty cycle (maximum)
tr, DRVH
tf, DRVH
ISOURCE = 1.5 A, 100 ns, positive pulse (0 V to 5 V)
ISINK = 1.5 A, 100 ns, negative pulse (5 V to 0 V)
BST − SW = 4.4 V, CIN = 4.3 nF (see Figure 59)
BST − SW = 4.4 V, CIN = 4.3 nF (see Figure 60)
tr,DRVL
tf,DRVL
ISOURCE = 1.5 A, 100 ns, positive pulse (0 V to 5 V)
ISINK = 1.5 A, 100 ns, negative pulse (5 V to 0 V)
VREG = 5.0 V, CIN = 4.3 nF (see Figure 60)
VREG = 5.0 V, CIN = 4.3 nF (see Figure 59)
ttpdhDRVH
ttpdhDRVL
ISWLEAK
BST − SW = 4.4 V (see Figure 59)
BST − SW = 4.4 V (see Figure 60)
BST = 25 V, SW = 20 V, VREG = 5 V
ISINK = 10 mA
VIN = 2.9 V to 20 V, VREG = 2.75 V to 5.5 V
VIN = 2.9 V to 20 V, VREG = 2.75 V to 5.5 V
VCOMP(LOW)
VCOMP(HIGH)
VCOMP_ZCT
TTMSD
Tie EN pin to VREG to enable device
(2.75 V ≤ VREG ≤ 5.5 V)
(2.75 V ≤ VREG ≤ 5.5 V)
(2.75 V ≤ VREG ≤ 5.5 V)
Rising temperature
COMP = 2.4 V
PGOOD
FBPGD
VFB rising during system power up
FBOV VFB rising during overvoltage event, IPGOOD = 1 mA
VPGOOD
IPGOOD = 1 mA
PGOOD = 5 V
Min Typ Max Unit
600 kHz
500 540 605 ns
82 110 ns
340 400 ns
1.0 MHz
285 312 360 ns
52 85 ns
340 400 ns
2.20 3
0.72 1
25
11
Ω
Ω
ns
ns
1.5 2.2 Ω
0.7 1
Ω
18 ns
16 ns
15.7 ns
16 ns
110 μA
22.3 Ω
605 634 663 mV
31 mV
0.47 V
2.55 V
1.10 V
155 °C
15 °C
6 ms
542 566 mV
34 55 mV
691 710 mV
35 55 mV
143 200 mV
1 100 nA
1 The maximum specified values are with the closed loop measured at 10% to 90% time points (see Figure 59 and Figure 60), CGATE = 4.3 nF, and the high- and low-side
MOSFETs being Infineon BSC042N03MS G.
2 Not automatic test equipment (ATE) tested.
Rev. A | Page 4 of 40

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ADP1878 전자부품, 판매, 대치품
Data Sheet
TYPICAL PERFORMANCE CHARACTERISTICS
100
95
90
85 VIN = 13V (PSM)
80
75
70
65
60
55
50
45
40
35
30
VIN = 16.5V (PSM)
25
20
15
10
5
0
10 100
VIN = 16.5V
VIN = 13V
TA = 25°C
fVSOWUT=
= 0.8V
300kHz
WÜRTH INDUCTOR:
744325072, L = 0.72µH, DCR = 1.3m
INFINEON FETs:
BSC042N03MS G (UPPER/LOWER)
1k 10k 100k
LOAD CURRENT (mA)
Figure 4. Efficiency—300 kHz, VOUT = 0.8 V
100
95
90
VIN = 5V (PSM)
85
80
75
70
65
60
VIN = 13V (PSM)
VIN = 16.5V
55
50
VIN = 13V
45
40 VIN = 16.5V (PSM)
35
30
25
20
15
10
5
TA = 25°C
fVSOWUT=
= 1.8V
300kHz
WÜRTH INDUCTOR:
744325120, L = 1.2µH, DCR = 1.8m
INFINEON FETs:
BSC042N03MS G (UPPER/LOWER)
0
10 100 1k 10k 100k
LOAD CURRENT (mA)
Figure 5. Efficiency—300 kHz, VOUT = 1.8 V
100
95
VIN = 16.5V (PSM)
90
85
80
75
70
VIN = 13V (PSM)
65
60
55
50
45
40
35
30
25
20
15
10
5
0
10 100
VIN = 13V
VIN = 16.5V
TA = 25°C
fVSOWUT=
= 7V
300kHz
WÜRTH INDUCTOR:
7443551200, L = 2.0µH, DCR = 2.6m
INFINEON FETs:
BSC042N03MS G (UPPER/LOWER)
1k 10k
LOAD CURRENT (mA)
100k
Figure 6. Efficiency—300 kHz, VOUT = 7 V
ADP1878/ADP1879
100
95
90
85
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
10
VIN = 13V
VIN = 13V (PSM)
VIN = 16.5V
VIN = 16.5V
(PSM)
TA = 25°C
fVSOWUT=
= 0.8V
600kHz
WÜRTH INDUCTOR:
744355147, L = 0.47µH, DCR = 0.67m
INFINEON FETs:
BSC042N03MS G (UPPER/LOWER)
100 1k 10k
LOAD CURRENT (mA)
100k
Figure 7. Efficiency—600 kHz, VOUT = 0.8 V
100
95
90
85
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
10
VIN = 13V
VIN = 13V (PSM)
VIN = 16.5V (PSM)
VIN = 16.5V
TA = 25°C
fVSOWUT=
= 1.8V
600kHz
WÜRTH INDUCTOR:
744325072, L = 0.72µH, DCR = 1.3m
INFINEON FETs:
BSC042N03MS G (UPPER/LOWER)
100 1k 10k
LOAD CURRENT (mA)
100k
Figure 8. Efficiency—600 kHz, VOUT = 1.8 V
100
95 VIN = 13V (PSM)
90
85
VIN = 16.5V (PSM)
80
75
70
65
60 VIN = 16.5V
55
50 VIN = 20V (PSM)
45
VIN = 20V
40
35
30
25
20
15
10
5
TA = 25°C
fVSOWUT=
= 5V
600kHz
WÜRTH INDUCTOR:
744318180, L = 1.4µH, DCR = 3.2m
INFINEON FETs:
BSC042N03MS G (UPPER/LOWER)
0
10 100 1k 10k 100k
LOAD CURRENT (mA)
Figure 9. Efficiency—600 kHz, VOUT = 5 V
Rev. A | Page 7 of 40

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