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ADP1870 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 ADP1870
기능 (ADP1870 / ADP1871) Synchronous Buck Controller
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ADP1870 데이터시트, 핀배열, 회로
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Synchronous Buck Controller with
Constant On-Time and Valley Current Mode
ADP1870/ADP1871
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 (ADP1871 only)
Resistor-programmable current-sense gain
Thermal overload protection
Short-circuit protection
Precision enable input
Integrated bootstrap diode for high-side drive
Starts into a precharged load
Small, 10-lead MSOP package
APPLICATIONS
Telecom and networking systems
Mid to high end servers
Set-top boxes
DSP core power supplies
GENERAL DESCRIPTION
The ADP1870/ADP1871 are versatile current-mode, synchronous
step-down controllers that 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. In addition, these devices offer
optimum performance at low duty cycles by utilizing valley
current-mode control architecture. This allows the ADP1870/
ADP1871 to drive all N-channel power stages to regulate output
voltages as low as 0.6 V.
The ADP1871 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 Power Saving Mode (PSM) Version (ADP1871)
section for more information).
Available in three frequency options (300 kHz, 600 kHz, and
1.0 MHz, plus the PSM option), the ADP1870/ADP1871 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 LDO.
TYPICAL APPLICATIONS CIRCUIT
VIN = 2.95V TO 20V
CC
VOUT RTOP
RC
CC2
RBOT
CVREG2
VIN
ADP1870/
ADP1871
COMP/EN BST
FB DRVH
GND
SW
VREG DRVL
PGND
CVREG
CIN
CBST
Q1 L
VOUT
COUT
Q2
RRES
LOAD
Figure 1.
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
VOUT = 1.8V
fSW = 300kHz
WÜRTH INDUCTOR:
744325120, L = 1.2µH, DCR = 1.8m
INFINEON FETs:
BSC042N03MS G (UPPER/LOWER)
1k 10k 100k
LOAD CURRENT (mA)
Figure 2. Efficiency vs. Load Current (VOUT = 1.8 V, 300 kHz)
In addition, an internally fixed soft start period is included to limit
input in-rush current from the input supply during startup and
to provide reverse current protection during soft start for a pre-
charged output. The low-side current-sense, current-gain scheme
and integration of a boost diode, along with the PSM/forced pulse-
width modulation (PWM) option, reduce the external part count
and improve efficiency.
The ADP1870/ADP1871 operate over the −40°C to +125°C
junction temperature range and are available in a 10-lead MSOP
package.
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
©2010 Analog Devices, Inc. All rights reserved.




ADP1870 pdf, 반도체, 판매, 대치품
ADP1870/ADP1871
Parameter
ADP1870ARMZ-0.6/
ADP1871ARMZ-0.6 (600 kHz)
On-Time
Minimum On-Time
Minimum Off-Time
ADP1870ARMZ-1.0/
ADP1871ARMZ-1.0 (1.0 MHz)
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
Symbol
tr,DRVH
tf,DRVH
tr,DRVL
tf,DRVL
ttpdhDRVH
ttpdhDRVL
ISWLEAK
VCOMP(low)
COMP Clamp High Voltage
COMP Zero Current Threshold
THERMAL SHUTDOWN
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
Hiccup Current Limit Timing
VCOMP(high)
VCOMP_ZCT
TTMSD
Conditions
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)
Min
500
285
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)
VBST − VSW = 4.4 V, CIN = 4.3 nF (see Figure 60)
VBST − VSW = 4.4 V, CIN = 4.3 nF (see Figure 61)
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 61)
VREG = 5.0 V, CIN = 4.3 nF (see Figure 60)
VBST − VSW = 4.4 V (see Figure 60)
VBST − VSW = 4.4 V (see Figure 61)
VBST = 25 V, VSW = 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
245
From disabled state, release COMP/EN pin to enable
device (2.75 V ≤ VREG ≤ 5.5 V)
(2.75 V ≤ VREG ≤ 5.5 V)
(2.75 V ≤ VREG ≤ 5.5 V)
0.47
Rising temperature
Typ Max Unit
600 kHz
540 580 ns
82 110 ns
340 400 ns
1.0 MHz
312 340 ns
60 85 ns
340 400 ns
2.25 3
0.7 1
25
11
Ω
Ω
ns
ns
1.6 2.2 Ω
0.7 1
Ω
18 ns
16 ns
15.4
18
110
ns
ns
μA
22 Ω
285 330 mV
37 mV
V
2.55 V
1.07 V
155 °C
15 °C
6 ms
1 The maximum specified values are with the closed loop measured at 10% to 90% time points (see Figure 60 and Figure 61), CGATE = 4.3 nF, and the upper- and lower-side
MOSFETs being Infineon BSC042N03MSG.
2 Not automatic test equipment (ATE) tested.
Rev. 0 | Page 4 of 44

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ADP1870 전자부품, 판매, 대치품
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
VOUT = 0.8V
fSW = 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 TA = 25°C
30 VOUT = 1.8V
25 fSW = 300kHz
20
15
10
5
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
VOUT = 7V
fSW = 300kHz
WÜRTH INDUCTOR:
7443551200, L = 2.0µH, DCR = 2.6m
INFINEON FETs:
BSC042N03MS G (UPPER/LOWER)
1k 10k 100k
LOAD CURRENT (mA)
Figure 6. Efficiency—300 kHz, VOUT = 7 V
ADP1870/ADP1871
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
VOUT = 0.8V
fSW = 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
VOUT = 1.8V
fSW = 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 TA = 25°C
30 VOUT = 5V
25 fSW = 600kHz
20
15
10
5
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. 0 | Page 7 of 44

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