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ADP1876 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADP1876
Beschreibung 600 kHz Dual Output Synchronous Buck PWM Controller
Hersteller Analog Devices
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Gesamt 25 Seiten
ADP1876 Datasheet, Funktion
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 Datasheet, Funktion
Data Sheet
Parameter
DHx or DLx Driver RON, Sourcing
Current1
Symbol
RON_SOURCE
DHx or DLx Driver RON, Tempco
DHx or DLx Driver RON, Sinking
Current1
TCRON
RON_SINK
DHx Maximum Duty Cycle
Minimum DHx On Time
Minimum DHx Off Time
Minimum DLx On Time
COMP VOLTAGE RANGE
THERMAL SHUTDOWN
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
OVERVOLTAGE AND POWER-GOOD
THRESHOLDS (FBx PINS)
FBx Overvoltage Threshold
FBx Overvoltage Hysteresis
FBx Undervoltage Threshold
FBx Undervoltage Hysteresis
FB1 TO TRK1 OFFSET VOLTAGE
SOFT START (SSx Pins)
SSx Output Current
SSx Pull-Down Resistor
POWER GOOD (PGOODx Pins)
PGOODx Pull-up Resistor
PGOODx Delay
Overvoltage or Undervoltage
Minimum Duration
ILIM1, ILIM2 Threshold Voltage1
ILIM1, ILIM2 Output Current
Current Sense Blanking Period
INTEGRATED RECTIFIER
(BOOST DIODE) RESISTANCE
INDEPENDENT LOW DROPOUT
LINEAR REGULATOR
VINLDO Voltage Range
VOUTLDO Voltage
VOUTLDO Maximum Load
Quiescent Current
Line Regulation
Load Regulation
Power Supply Rejection Ratio
VCOMP
TTMSD
VOV
VUV
ISS
RPGOOD
VINLDO
VOUTLDO
VOUTLDO
IINLDO
ΔVOUTLDO
ΔVOUTLDO
PSRR
Test Conditions/Comments
Sourcing 2 A with a 100 ns pulse
Sourcing 1 A with a 100 ns pulse,
VIN = 3 V
VIN = 3 V or 12 V
Sinking 2 A with a 100 ns pulse
Sinking 1 A with a 100 ns pulse,
VIN = 3 V
fOSC = 600 kHz
Min
0.85
VFB rising
VFB rising
TRK1 = 0.3 V to 0.55 V,
offset = VFB − VTRK
During start-up
During a fault condition
Internal pull-up resistor to VCCO
This is the minimum duration
required to trip the PGOODx signal
Relative to PGNDx
ILIMx = PGNDx
After DLx goes high, current limit is
not sensed during this period
At 20 mA forward current
0.67
0.51
−120
4.6
−5
40
Input range
VINLDO = 2.7 V to 5.5 V, IOUTLDO = 1 mA to
150 mA
VINLDO = 2.7 V to 5.5 V
VINLDO = 2.7 V to 5.5 V, no load at
output
IOUTLDO = 150 mA, VINLDO = 2.7 V to 5.5 V
VINLDO = 2.7 V to 5.5 V, IOUTLDO = 1 mA to
150 mA
1 kHz, VINDLO = 2.7 V to 5.5 V,
10 mA load
2.7
1.47
ADP1876
Typ Max
2
2.3
0.3
1.5
2
76
130
340
290
2.3
155
20
Unit
Ω
Ω
%/°C
Ω
Ω
%
ns
ns
ns
V
°C
°C
0.7 0.73
40
0.54 0.57
30
+50
V
mV
V
mV
mV
6.5 8.4
1
12.5
12
12
0 +5
50 60
100
16
μA
μs
μs
mV
μA
ns
Ω
5.5 V
1.5 1.53 V
150 mA
30 60
μA
0.3 %
0.4 %
70 dB
Rev. A | Page 5 of 24

6 Page









ADP1876 pdf, datenblatt
Data Sheet
1
SW
VOUT (CH3)
EN
3
2
4
SS (CH4)
CSS = 100nF
CH1 10V
CH3 1V
CH2 2V
CH4 1V
M10ms
A CH2 1.52V
Figure 10. Enable Startup Function
SW1
1
VOUT1 (PRELOADED)
VCCO
2
VOUTLDO
4
CH1 10.0V BW CH2 2.00V BW M10.0ms
CH3 2.00V BW CH4 1.00V BW
A CH4
800mV
Figure 11. Thermal Shutdown Waveform
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
2.5
REFERENCE AT VIN = 2.75V
600kHz
5.0 7.5 10.0 12.5 15.0 17.5 20.0
VIN (V)
Figure 12. Change in fSW vs. VIN
ADP1876
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
–2.5
–40
VIN = 12V; REFERENCED AT 25°C
–15 10 35 60 85
TEMPERATURE (°C)
Figure 13. fSW vs. Temperature
110 135
350
300
DHx MINIMUM OFF TIME
250
200
150
DHx MINIMUM ON TIME
100
50
2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0
VIN (V)
Figure 14. Typical DHx Minimum On Time and Off Time
4
3
DHx MINIMUM OFF TIME
2
1
DHx MINIMUM ON TIME
0
–1
–2
–3
–4
–40 –15
10
35
60
85 110 135
TEMPERATURE (°C)
Figure 15. DHx Minimum On Time and Off Time Over Temperature
Rev. A | Page 11 of 24

12 Page





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