ADP2102-1.375EVALZ Analog Devices Inc, ADP2102-1.375EVALZ Datasheet

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ADP2102-1.375EVALZ

Manufacturer Part Number
ADP2102-1.375EVALZ
Description
BOARD EVAL FOR ADP2102-1.375
Manufacturer
Analog Devices Inc
Datasheets

Specifications of ADP2102-1.375EVALZ

Main Purpose
DC/DC, Step Down
Outputs And Type
1, Non-Isolated
Voltage - Output
1.375V
Current - Output
600mA
Voltage - Input
2.7 ~ 5.5V
Regulator Topology
Buck
Board Type
Fully Populated
Utilized Ic / Part
ADP2102
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Frequency - Switching
-
FEATURES
Input voltage range: 2.7 V to 5.5 V
600 mA maximum load current
95% efficiency
Low duty cycle operation
Only 3 tiny external ceramic components
3 MHz typical operating frequency
Fixed output voltage from 0.8 V to 1.875 V
Adjustable output voltage up to 3.3 V
0.01 μA shutdown supply current
Automatic power save mode
Internal synchronous rectifier
Internal soft start
Internal compensation
Enable/shutdown logic input
Undervoltage lockout
Current limit protection
Thermal shutdown
Small 8-lead, 3 mm × 3 mm LFCSP package
APPLICATIONS
USB powered devices
WLAN and gateways
Point of loads
Processor core power from 5 V
Digital cameras
PDAs and palmtop computers
Portable media players, GPS
Rev. B
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.
Trademarks and registered trademarks are the property of their respective owners.
TYPICAL PERFORMANCE CHARACTERISTICS
100
95
90
85
80
75
70
65
60
10
V
IN
= 3.6V
LOAD CURRENT (mA)
Figure 1.
V
V
100
IN
IN
= 2.7V
V
= 3V
IN
= 4.2V
V
T
A
OUT
Low Duty Cycle, 600 mA, 3 MHz Synchronous
= 25°C
= 1.375V
1000
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
Step-Down DC-to-DC Converter
GENERAL DESCRIPTION
The ADP2102 is a synchronous step-down dc-to-dc converter
that converts a 2.7 V to 5.5 V unregulated input voltage to a lower
regulated output voltage with up to 95% efficiency and 1%
accuracy. The low duty cycle capability of the ADP2102 is ideal for
USB applications or 5 V systems that power up submicron subvolt
processor cores. Its 3 MHz typical operating frequency and excel-
lent transient response allow the use of small, low cost 1 μH
inductors and 2.2 μF ceramic capacitors. At medium-to-high
load currents, it uses a current mode, pseudofixed frequency pulse-
width modulation to extend battery life. To ensure the longest
battery life in portable applications, the ADP2102 has a power save
mode (PSM) that reduces the switching frequency under light
load conditions to significantly reduce quiescent current.
The ADP2102 is available in both fixed and adjustable output
voltage options with 600 mA maximum output current. The preset
output voltage options voltage are 1.875 V, 1.8 V, 1.5 V, 1.375 V,
1.25 V, 1.2 V, 1.0 V, and 0.8 V. The adjustable voltage option is
available from 0.8 V to 3.3 V. The ADP2102 requires only three
external components and consumes 0.01 μA in shutdown mode.
The ADP2102 is available in an 8-lead LFCSP package and is
specified for the −40 °C to +85 °C temperature range.
INPUT VOLTAGE
2.7V TO 5.5V
DCM/
CCM
FORCED
2.2µF
TYPICAL APPLICATIONS CIRCUIT
C
CCM
IN
V
MODE
IN
OFF
©2007 Analog Devices, Inc. All rights reserved.
ADP2102
EN
ON
Figure 2.
GND
FB/OUT
LX
1µH
L
ADP2102
OUTPUT VOLTAGE
0.8V TO 1.875V
www.analog.com
C
2.2µF
OUT

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ADP2102-1.375EVALZ Summary of contents

Page 1

... V, 1.8 V, 1.5 V, 1.375 V, 1.25 V, 1.2 V, 1.0 V, and 0.8 V. The adjustable voltage option is available from 0 3.3 V. The ADP2102 requires only three external components and consumes 0.01 μA in shutdown mode. The ADP2102 is available in an 8-lead LFCSP package and is specified for the − ...

Page 2

... ADP2102 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Typical Performance Characteristics ............................................. 1 Typical Applications Circuit............................................................ 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 4 Thermal Resistance ...................................................................... 4 Boundary Condition.................................................................... 4 ESD Caution.................................................................................. 4 Pin Configuration and Function Descriptions............................. 5 Typical Performance Characteristics ............................................. 6 Theory of Operation ...................................................................... 13 Control Scheme .......................................................................... 13 Constant On-Time Timer ......................................................... 13 Forced Continuous Conduction Mode ................................... 13 Power Save Mode ...

Page 3

... V Line Regulation V FEEDBACK CHARACTERISTICS FB Regulation Voltage ADP2102-ADJ FB Bias Current ADP2102-ADJ, ADP2102-0.8 FB Impedance ADP2102-xx CURRENT CHARACTERISTICS Operating Current ADP2102 PSM mode, I Shutdown Current Output Current ADP2102 (SWITCH NODE) CHARACTERISTICS LX On Resistance P-channel switch, I N-channel synchronous rectifier Leakage Current V LX Minimum Off-Time ADP2102-xx, ADP2102-ADJ LX On-Time ADP2102-0 ...

Page 4

... Storage Temperature Range Soldering Conditions 1 The ADP2102 can be damaged when junction temperature limits are exceeded. Monitoring ambient temperature does not guarantee that T is within the specified temperature limits. In applications where high power dissipation and poor thermal resistance are present, the maximum ambient temperature may have to be derated ...

Page 5

... Mode Input. To set the ADP2102 to forced continuous conduction mode (CCM), drive MODE high. To set the ADP2102 to power save mode/auto mode (PSM), drive MODE low Enable Input. Drive EN high to turn on the ADP2102. Drive EN low to turn it off and reduce the input current to 0.1 μA. This pin cannot be left floating. 3 FB/OUT Output Sense Input or Feedback Input ...

Page 6

... ADP2102 TYPICAL PERFORMANCE CHARACTERISTICS 2.2 μ 2.2 μ OUT 100 2. 3. LOAD CURRENT (mA) Figure 4. Efficiency vs. Load Current (V 100 2. 3. LOAD CURRENT (mA) Figure 5. Efficiency vs. Load Current (V 100 2. 3. LOAD CURRENT (mA) Figure 6. Efficiency vs. Load Current (V = 4.7 μF, unless otherwise noted 25° 4.5V ...

Page 7

... V) Figure 14. Output Voltage vs. Load Current (V 1. 25°C A 1.22 1.21 1.20 1.19 1.18 –45 500 600 = 1.2 V) Figure 15. Output Voltage vs. Temperature (V OUT Rev Page ADP2102 T = 25°C A PSM CCM 100 200 300 400 500 LOAD CURRENT (mA) = 1.5 V) OUT T = 25°C A PSM ...

Page 8

... ADP2102 1.52 1.51 1. 0mA LOAD I = 300mA 1.49 LOAD I = 600mA LOAD 1.48 1.47 1.46 –40 – TEMPERATURE (°C) Figure 16. Output Voltage vs. Temperature (V 1. 0mA LOAD I = 300mA 1.80 LOAD 1. 600mA LOAD 1.78 1.77 1.76 –40 – TEMPERATURE (°C) Figure 17. Output Voltage vs. Temperature (V 3.40 3 ...

Page 9

... CH1 500mA Ω Figure 26. PSM Mode Operation at Very Light Loads (10 mA 25° 5.1 5.4 CH1 50.0mV CH3 Figure 27. PSM Mode Entry—Exit Operation ( mA) Rev Page ADP2102 PMOS SWITCH NMOS SWITCH – 100 TEMPERATURE (°C) Figure 25. Switch On Resistance vs. Temperature 25°C A ...

Page 10

... ADP2102 T CH4 CH1 CH2: V OUT 2 CH1 500mA Ω CH2 2.00V M 10.0µ CH4 2.00V 51.00% Figure 28. PSM Mode Operation at Light Loads (75 mA) T CH1: IL CH3 CH4: V OUT 4 CH1 200mA Ω M 200ns B W CH3 2.00V CH4 2.00V –4.00000ns Figure 29. CCM Mode Operation at Medium/Heavy Loads (0.3 A) ...

Page 11

... CH1 50.0mV CH3 = 1 25° 3.74V CH1 = 1 25° 3.72V CH1 CH3 200mA Ω = 1.5 V) Rev Page ADP2102 25°C A CH1: V (AC) OUT CH3: V (3.6V TO 4.2V STEP 40.0µs A CH3 B W 1.00V B W Figure 37. Line Transient Response (V = 1.8 V) OUT 25°C CH4: EN ...

Page 12

... ADP2102 T CH1 CH2: V OUT 2 CH3 CH1 2.00V CH2 500mV M 2.00ms A CH2 CH3 200mA Ω 6.600% Figure 40. Heavy Load Start-Up Waveform T CH4: V (AC) OUT 4 CH1 CH1 2.00V M 2.00µ CH4 20.00mV 51.00% Figure 41. PSM Mode Ripple (V = 3.6 V, Load = 50 mA 25° 350mV T = 25° 2.2µ ...

Page 13

... In this mode, efficiency is lower at light loads, compared to the power save mode, but the output voltage ripple is minimized. POWER SAVE MODE When the MODE pin is low, the ADP2102 operates in power save mode (PSM). In this mode, at light load currents, the part automatically goes into reduced frequency operation where some pulses are skipped to increase efficiency while remaining in regulation ...

Page 14

... OUT V Δ The ADP2102 also provides a negative current limit to prevent an excessive reverse inductor current when the switching section sinks current from the load in forced continuous conduction mode. Under negative current limit conditions, both the high- side and low-side switches are disabled. ...

Page 15

... SOFT START The ADP2102 has an internal soft start function that ramps the output voltage in a controlled manner upon startup, therefore limiting the inrush current. This prevents possible input voltage drops when a battery or a high impedance power source is connected to the input of the converter. ...

Page 16

... light load currents, the converter operates in power save IN mode, and the output voltage ripple is dependent on the output capacitor value. The ADP2102 control loop is stable with a ceramic ) output capacitor of 2.2 μF. For better transient performance μF (9) ceramic capacitor is recommended at the output. Table 6 lists input and output MLCC capacitors recommended for ADP2102 applications ...

Page 17

... OUT IN BP 4.7µF 2.2µF 0.01µF Figure 48. ADP2102-FXD (0 mA ≤ I ≤ 600 mA) LOAD Rev Page ADP2102 Size (L × W × H) (mm) 2.5 × 2.0 × 1.0 2.5 × 2.0 × 1.0 2.5 × 2.0 × 1.1 2.9 × 2.9 × 1.5 3.0 × ...

Page 18

... NOTE *C IS NEEDED FOR ADJUSTABLE V > 1.875V ONLY. FF OUT SEE TABLE 7 FOR ADJUSTABLE V CONFIGURATIONS. OUT Figure 50. ADP2102-ADJ (0 mA ≤ I LOAD Rev Page INPUT VOLTAGE = 2.7V TO 5.5V V OUT OUTPUT VOLTAGE = 0.8V TO 3.3V GND ≤ 300 mA INPUT VOLTAGE = 2.7V TO 5.5V ...

Page 19

... SETTING THE OUTPUT VOLTAGE The output voltage of the ADP2102-ADJ is externally set by a resistive voltage divider from the output voltage to FB. The ratio of the resistive voltage divider sets the output voltage, and the absolute value of those resistors sets the divider string current. For ...

Page 20

... LX node. F THERMAL CONSIDERATIONS In most applications, the ADP2102 does not dissipate a lot of heat, due to its high efficiency. However, in applications with maximum loads at high ambient temperature, low supply voltage, and high duty cycle, the heat dissipated in the package is great enough that it may cause the junction temperature of the die to exceed the maximum junction temperature of 125° ...

Page 21

... TRAN IN OUT 32 × V × (200 pF) × SW GATE_P GATE_N × 3 × 7 DCR × 0.08 × (0. OUT = LOSS SW_COND TRAN θ JMAX 85°C + 54°C/W × 151 mW = 93.15°C LOSS is well below the junction temperature maximum of 125°C. ADP2102 IN_MIN OUT ...

Page 22

... PGND pin through L and C to the PGND plane as short as possible this, ensure that the PGND pin of the ADP2102 is tied to the PGND plane as close as possible to the input and output capacitors. • Place the feedback resistor divider network as close as possible to the FB pin to prevent noise pickup ...

Page 23

... VIN MODE CBP EN FB/OUT ADP2102 AGND Figure 52. Recommended Layout of the Top Layer of the ADP2102-FXD Application Board VIN MODE EN AGND FB/OUT Figure 53. Recommended Layout of the Bottom Layer of the ADP2102-FXD Application Board Rev Page PGND CIN VOUT COUT L1 INDUCTOR PGND VOUT ADP2102 ...

Page 24

... ADP2102YCPZ-1-R7 600 1 ADP2102YCPZ-2-R7 600 1 ADP2102YCPZ-3-R7 600 1 ADP2102YCPZ-4-R7 600 1 ADP2102-0.8-EVALZ 1 ADP2102-1.0-EVALZ 1 ADP2102-1.2-EVALZ 1 ADP2102-1.25-EVALZ 1 ADP2102-1.375-EVALZ 1 ADP2102-1.5-EVALZ ADP2102-1.8-EVALZ 1 1 ADP2102-1.875EVALZ 1 ADP2102-1-EVALZ 1 ADP2102-2-EVALZ 1 ADP2102-3-EVALZ 1 ADP2102-4-EVALZ RoHS Compliant Part 3.3 V adjustable output voltage option is from 4.5 V < Operating junction temperature range: −40°C to +125°C. ...

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