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ADP2119 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADP2119
Beschreibung Step-Down DC-to-DC Regulators
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 24 Seiten
ADP2119 Datasheet, Funktion
2 A/1.25 A, 1.2 MHz, Synchronous,www.DataSheet4U.com
Step-Down DC-to-DC Regulators
ADP2119/ADP2120
FEATURES
Continuous output current
ADP2119: 2 A
ADP2120: 1.25 A
145 mΩ and 70 mΩ integrated MOSFETs
Input voltage range from 2.3 V to 5.5 V
Output voltage from 0.6 V to VIN
±1.5% output accuracy
1.2 MHz fixed switching frequency
Synchronizable between 1 MHz and 2 MHz
Selectable PWM or PFM mode operation
Current mode architecture
Precision threshold enable input
Power-good flag
Voltage tracking
Integrated soft start
Internal compensation
Startup with precharged output
UVLO, OVP, OCP, and thermal shutdown
10-lead, 3 mm × 3 mm LFCSP_WD package
APPLICATIONS
Point of load conversion
Communications and networking equipment
Industrial and instrumentation
Consumer electronics
Medical applications
GENERAL DESCRIPTION
The ADP2119/ADP2120 are low quiescent current, synchronous,
step-down dc-to-dc regulators in a compact 3 mm × 3 mm
LFCSP_WD package. Both devices use a current mode, constant
frequency pulse-width modulation (PWM) control scheme for
excellent stability and transient response. Under light load conditions,
they can be configured to operate in a pulse frequency modulation
(PFM) mode, which reduces switching frequency to save power.
The ADP2119/ADP2120 support input voltages from 2.3 V to
5.5 V. The output voltage can be adjusted from 0.6 V up to the
input voltage (VIN) for the adjustable version, whereas the fixed
output version is available in preset output voltage options of 3.3 V,
2.5 V, 1.8 V, 1.5 V, 1.2 V, and 1.0 V. The ADP2119/ADP2120 require
minimal external parts and provide a high efficiency solution with
their integrated power switches, synchronous rectifiers, and internal
compensation. Each IC draws less than 2 μA current from the input
source when it is disabled. Other key features include undervoltage
lockout (UVLO), integrated soft start to limit inrush current at
startup, overvoltage protection (OVP), overcurrent protection
(OCP), and thermal shutdown (TSD).
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.
TYPICAL APPLICATION CIRCUIT
C1
0.1µF
VIN
5V CIN
22µF
X5R
6.3V
R1
10ADP2119/ADP2120
1 VIN
EN 10
VOUT
3.3V
COUT
22µF
X5R
6.3V
L
1.5µH
RTOP
10k
RBOT
2.21k
2 PVIN
3 SW
SYNC/MODE 9
R2
10k
PGOOD 8
4 PGND
TRK 7
5 GND
FB 6
Figure 1.
100
VIN = 5V
90 VOUT = 1.8V
80
70
PFM
60
50
40
FPWM
30
20
10
0
0.01
0.1
OUTPUT CURRENT (A)
1
Figure 2. ADP2119 Efficiency vs. Output Current
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.






ADP2119 Datasheet, Funktion
ADP2119/ADP2120
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADP2119/ADP2120
VIN 1
PVIN 2
SW 3
PGND 4
GND 5
EXPOSED
PAD
10 EN
9 SYNC/MODE
8 PGOOD
7 TRK
6 FB
NOTES
1. THE EXPOSED PAD SHOULD BE SOLDERED TO
AN EXTERNAL GROUND PLANE UNDERNEATH
THE IC FOR THERMAL DISSIPATION.
Figure 3. Pin Configuration (Top View)
www.DataSheet4U.com
Table 4. Pin Function Descriptions
Pin No. Mnemonic Description
1 VIN
Bias Voltage Input Pin. Connect a bypass capacitor (0.1 μF minimum) between this pin and GND and a
small (10 Ω) resistor between this pin and PVIN.
2 PVIN Power Input Pin. Connect this pin to the input power source. Connect a bypass capacitor between this pin and PGND.
3 SW
Switch Node Output. Connect this pin to the output inductor.
4
PGND
Power Ground. Connect this pin to the power ground plane and to the high current return for the power MOSFET.
5 GND Analog Ground. Connect this pin to the ground plane.
6 FB
Feedback Voltage Sense Input. Connect this pin to a resistor divider from VOUT. For the fixed output version,
connect to VOUT directly.
7 TRK
Tracking Input. To track a master voltage, drive TRK from a resistor divider from the master voltage. If the
tracking function is not used, connect TRK to VIN.
8
PGOOD
Power-Good Output (Open Drain). Connect this pin to a resistor to any pull-up voltage < 5.5 V.
9 SYNC/MODE Synchronization Input (SYNC). Connect this pin to an external clock between 1 MHz and 2 MHz to synchronize
the switching frequency to the external clock (see the Oscillator and Synchronization section for details).
FPWM/PFM Selection (MODE). When this pin is connected to VIN, the PFM mode is disabled and the part works
in continuous conduction mode (CCM) only. When this pin is connected to ground, the PFM mode is enabled
and becomes active at light loads.
10 EN
Precision Threshold Enable Input Pin. An external resistor divider can be used to set the turn-on threshold. To
enable the part automatically, connect the EN pin to VIN. This pin has a 1 MΩ pull-down resistor to GND.
EPAD
Exposed Pad The exposed pad should be soldered to an external ground plane underneath the IC for thermal dissipation.
Rev. 0 | Page 6 of 24

6 Page









ADP2119 pdf, datenblatt
ADP2119/ADP2120
VOUT (AC)
1
T
SW
2
IL
4
CH1 20.0mV CH2 5.00V
M4.0µs
A CH4 820mA
CH4 500mA T –40.0ns
Figure 34. PFM Mode
VOUT (AC)
1
T
SW
2
IL
4
CH1 5.0mV CH2 5.00V
M1.0µs
A CH2 4.3V
CH4 500mA T –40.0ns
Figure 35. Discontinuous Conduction Mode (DCM)
VOUT (AC)
1
T
SW
2
IL
4
CH1 5.0mV CH2 5.00V
CH4 1.0A
M1.0µs
A CH2 4.3V
T –40.0ns
Figure 36. Continuous Conduction Mode (CCM)
www.DataSheet4U.com
80 200
64 160
48 120
32 80
16 40
00
–16 –40
–32 –80
–48 –120
–64
CROSS FREQUENCY: 124kHz
–80 PHASE MARGIN: 46°
1k 10k
100k
–160
–200
1M
FREQUENCY (Hz)
Figure 37. ADP2119 Bode Plot at VIN = 5 V, VOUT = 1.0 V, IO = 2 A,
L = 1 μH, COUT = 2 × 22 μF
80 200
64 160
48 120
32 80
16 40
00
–16 –40
–32 –80
–48 –120
–64
CROSS FREQUENCY: 105kHz
–80 PHASE MARGIN: 47°
1k 10k
100k
–160
–200
1M
FREQUENCY (Hz)
Figure 38. ADP2119 Bode Plot at VIN = 5 V, VOUT = 1.2 V, IO = 2 A,
L = 1.5 μH, COUT = 2 × 22 μF
80 200
64 160
48 120
32 80
16 40
00
–16 –40
–32 –80
–48 –120
–64
CROSS FREQUENCY: 112kHz
–80 PHASE MARGIN: 48°
1k 10k
100k
–160
–200
1M
FREQUENCY (Hz)
Figure 39. ADP2119 Bode Plot at VIN = 5 V, VOUT = 1.5 V, IO = 2 A,
L = 1.5 μH, COUT = 22 μF +10 μF
Rev. 0 | Page 12 of 24

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