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ADP1876 데이터시트 PDF




Analog Devices에서 제조한 전자 부품 ADP1876은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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부품번호 ADP1876 기능
기능 600 kHz Dual Output Synchronous Buck PWM Controller
제조업체 Analog Devices
로고 Analog Devices 로고


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ADP1876 데이터시트, 핀배열, 회로
Data Sheet
600 kHz Dual Output Synchronous Buck
PWM Controller with Linear Regulator
ADP1876
FEATURES
Wide input range: 2.75 V to 20 V
Power stage input voltage: 1 V to 20 V
Output voltage range: 0.6 V up to 90% VIN
Linear dropout (LDO) regulator with a fixed output
1.5 V at 150 mA
Output current more than 25 A per channel
180º phase shift between channels for reduced input
capacitance
±0.85% reference voltage accuracy from −40°C to +85°C
Integrated boost diodes
Independent channel precision enable
Overcurrent limit protection
Externally programmable soft start, slope compensation,
and current sense gain
Thermal overload protection
Input undervoltage lockout (UVLO)
Power good with internal pull-up resistor
Available in 32-lead, 5 mm × 5 mm LFCSP
APPLICATIONS
Consumer applications
Telecommunications base station and networking
Industrial and instrumentation
GENERAL DESCRIPTION
The ADP1876 is a dual output dc-to-dc synchronous buck
controller operating at 600 kHz fixed frequency with integrated
drivers that drive N-channel power MOSFETs. An additional
fixed voltage output, 150 mA linear regulator is available for
powering low power loads. The device operates in current
mode for improved transient response and uses valley current
TYPICAL OPERATION CIRCUIT
RRAMP1
VIN
RAMP1 VIN
ADP1876
EN1
EN2
VDL
VCCO
DH1
BST1
SW1
ILIM1
FB1
3V to 5V INPUT
TRK1
PGOOD1
PGOOD2
DL1
VINLDO PGND1
VOUTLDO
1.5V
RAMP2
NC
RCSG1
RRAMP2
COMP1
COMP2
DH2
BST2
SW2
ILIM2
FB2
SS1
SS2
AGND
DL2
PGND2
RCSG2
M1
L1
R11
M2
R12
VIN
M3
L2
R21
M4
R22
Figure 1.
VOUT1
VOUT2
sensing for enhanced noise immunity. The two PWM outputs
are phase shifted 180° for reducing the input current ripple and
the required input capacitance.
The ADP1876 provides high speed, high peak current drive
capability with dead time optimization to enable energy
efficient power conversion.
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
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.
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 Analog Devices, Inc. All rights reserved.




ADP1876 pdf, 반도체, 판매, 대치품
Data Sheet
ADP1876
FUNCTIONAL BLOCK DIAGRAM
THERMAL
SHUTDOWN
VIN VCCO
LDO
REF
OV
0.6V
UV
EN1
EN2
VINLDO
VOUTLDO
NC
COMP1
FB1
TRK1
SS1
RAMP1
0.6V
UVLO
ADP1876
+
+
LINEAR
REGULATOR
LOGIC
EN1_SW
EN2_SW
OSCILLATOR
600kHz
PH1
PH2
DUPLICATE FOR
CHANNEL 2
VCCO
OV1
UV1
LOGIC
12kΩ
ERROR
– AMPLIFIER
+
+
gm
+
VREF = 0.6V
6.5µA
3.2V
FAULT LOGIC
OV1
1kΩ
EN1 OVER_LIM1
FB2
0.6V
OV
UV
+
+
VCCO
0.9V +
EN1_SW
OVER_LIM1
OV1
PULSE SKIP
DRIVER LOGIC
CONTROL AND
STATE
MACHINE
+
PWM
COMPARATOR
DCM
ZERO CROSS
DETECT
+
SLOPE COMP AND
RAMP GENERATOR
DL
DRIVER
CS GAIN
AV = 3, 6, 12, 24
CURRENT SENSE
+ AMPLIFIER
CURRENT-
LIMIT
OVER_LIM1 CONTROL
+
VCCO
50µA
AGND
PGOOD1
BST1
DH1
SW1
VDL
DL1
PGND1
ILIM2
Figure 2. Functional Block Diagram
Rev. A | Page 3 of 24

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ADP1876 전자부품, 판매, 대치품
ADP1876
Parameter
RMS Output Noise
Short-Circuit Current
Undervoltage Lockout Threshold
Undervoltage Lockout Hysteresis
Symbol
N
VINLDO_UVLO
1 Guaranteed by design. Not production tested.
2 Connect VIN to VCCO when VIN < 5.5 V.
Test Conditions/Comments
10 Hz to 100 kHz, VINLDO = 5 V
VOUTLDO = GND
VINLDO rising
VINLDO
Data Sheet
Min Typ Max Unit
40 µV rms
400 mA
2.35 2.5 2.65 V
0.18 V
Rev. A | Page 6 of 24

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