ON JMK212BJ106MG 1a high-efficiency step-down dc-dc converter Datasheet

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FAN2001/FAN2002
1A High-Efficiency Step-Down DC-DC Converter
Features
Description
■
■
■
■
■
■
■
96% Efficiency, Synchronous Operation
Adjustable Output Voltage Options from 0.8V to VIN
2.5V to 5.5V Input Voltage Range
Up to 1A Output Current
Fixed Frequency 1.3MHz PWM Operation
High Efficiency Power Save Mode
100% Duty Cycle Low Dropout Operation
Designed for use in battery-powered applications, the FAN2001/
FAN2002 is a high-efficiency, low-noise synchronous PWM current mode and Pulse Skip (Power Save) mode DC-DC converter. It can provide up to 1A of output current over a wide input
range from 2.5V to 5.5V. The output voltage can be externally
adjusted over a wide range of 0.8V to 5.5V by means of an
external voltage divider.
■
■
■
■
■
■
Soft Start
Output Over-Voltage Protection
Dynamic Output Voltage Positioning
25µA Quiescent Current
Thermal Shutdown and Short Circuit Protection
Pb-Free 3x3mm 6-Lead MLP Package
At moderate and light loads, pulse skipping modulation is used.
Dynamic voltage positioning is applied, and the output voltage is
shifted 0.8% above nominal value for increased headroom during load transients. At higher loads the system automatically
switches over to current mode PWM control, operating at 1.3
MHz. A current mode control loop with fast transient response
ensures excellent line and load regulation. To achieve high efficiency and ensure long battery life, the quiescent current is
reduced to 25µA in Power Save mode, and the supply current
drops below 1µA in shut-down mode. The FAN2001/FAN2002 is
available in a 3x3mm 6-lead MLP package.
Applications
■
■
■
■
Pocket PCs, PDAs
Cell Phones
Battery-Powered Portable Devices
Digital Cameras
■
■
■
■
Hard Disk Drives
Set-Top-Boxes
Point-of-Load Power
Notebook Computers
■ Communications Equipment
Typical Application
VIN
CIN
PGND
SW
1
2
10µF
EN
6
P1
(AGND)
3
5
4
VOUT
1.2V (1A)
3.3µH
NC
R1
5KΩ
FB
R2
FB
R2 10KΩ
COUT
2 x 10µF
R1 5KΩ
VOUT
1.2V (1A)
10KΩ
L1
3.3µH
PGND
SW
1
2
3
6
P1
(AGND)
5
4
EN
VIN
PVIN
10µF
2 x 10µF
FAN2001
FAN2002
Figure 1. Typical Application
FAN2001/FAN2002 Rev. 1.0.2
©2005 Fairchild Semiconductor Corporation
1
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FAN2001/FAN2002 1A High-Efficiency Step-Down DC-DC Converter
April 2005
Top View
VIN
1
6
P1
PGND
2
EN
3
(AGND)
SW
FB
1
6
EN
5
VIN
4
PVIN
P1
5
NC
PGND
2
4
FB
SW
3
FAN2001
(AGND)
FAN2002
3x3mm 6-Lead MLP
Figure 2. Pin Assignment
Pin Description
FAN2001 (3x3mm 6-Lead MLP)
Pin No.
Pin Name
P1
AGND
1
VIN
2
PGND
3
EN
Pin Description
Analog Ground. P1 must be soldered to the PCB ground.
Supply Voltage Input.
Power Ground. This pin is connected to the internal MOSFET switches. This pin must be
externally connected to AGND.
Enable Input. Logic high enables the chip and logic low disables the chip, reducing the supply
current to less than 1µA. Do not float this pin.
4
FB
Feedback Input. Adjustable voltage option, connect this pin to the resistor divider.
5
NC
No Connection Pin.
6
SW
Switching Node. This pin is connected to the internal MOSFET switches.
FAN2002 (3x3mm 6-Lead MLP)
Pin No.
Pin Name
P1
AGND
1
FB
2
PGND
Pin Description
Analog Ground. P1 must be soldered to the PCB ground.
Feedback Input. Adjustable voltage option, connect this pin to the resistor divider.
Power Ground. This pin is connected to the internal MOSFET switches. This pin must be externally connected to AGND.
3
SW
Switching Node. This pin is connected to the internal MOSFET switches.
4
PVIN
Supply Voltage Input. This pin is connected to the internal MOSFET switches.
5
VIN
Supply Voltage Input.
6
EN
Enable Input. Logic high enables the chip and logic low disables the chip, reducing the supply
current to less than 1µA. Do not float this pin.
FAN2001/FAN2002 Rev. 1.0.2
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FAN2001/FAN2002 1A High-Efficiency Step-Down DC-DC Converter
Pin Assignment
Parameter
Min
Max
Unit
VIN, PVIN
-0.3
7
V
Voltage On Any Other Pin
-0.3
VIN
V
Lead Soldering Temperature (10 seconds)
260
°C
Junction Temperature
150
°C
Storage Temperature
-65
Thermal Resistance-Junction to Tab (θJC), 3x3mm 6-lead MLP (Note 2)
Electrostatic Discharge Protection (ESD) Level (Note 3)
HBM
4
CDM
1
Min
Typ
150
°C
8
°C/W
kV
Recommended Operating Conditions
Max
Unit
Supply Voltage Range
Parameter
2.5
5.5
V
Output Voltage Range, Adjustable Version
0.8
VIN
V
1
A
Output Current
Inductor (Note 4)
µH
3.3
Input Capacitor (Note 4)
Output Capacitor (Note 4)
10
µF
2 x 10
µF
Operating Ambient Temperature Range
-40
+85
°C
Operating Junction Temperature Range
-40
+125
°C
Notes:
1. Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure
to absolute maximum rating conditions for extended periods may affect device reliability. Absolute maximum ratings apply individually only, not in
combination. Unless otherwise specified, all other voltages are referenced to AGND.
2. Junction to ambient thermal resistance, θJA, is a strong function of PCB material, board thickness, thickness and number of copper planes, number of
via used, diameter of via used, available copper surface, and attached heat sink characteristics.
3. Using Mil Std. 883E, method 3015.7(Human Body Model) and EIA/JESD22C101-A (Charge Device Model).
4. Refer to the applications section for further details.
FAN2001/FAN2002 Rev. 1.0.2
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FAN2001/FAN2002 1A High-Efficiency Step-Down DC-DC Converter
Absolute Maximum Ratings (Note1)
VIN = VOUT + 0.6V(min. 2.5V) to 5.5V, IOUT = 350mA, VOUT =1.2V, EN = VIN, TA = -40°C to +85°C,
Unless otherwise noted. Typical values are at TA = 25°C.
Symbol
VIN
IQ
Parameter
Input Voltage
Quiescent Current
Conditions
Enable High Input Voltage
VENL
Enable Low Input Voltage
Units
2.5
5.5
V
2.7
5.5
V
35
µA
20
R2 =10KΩ
µA
50
R2 =100KΩ
0.1
1
µA
µA
2.1
2.3
V
25
EN = GND
Lockout VIN Rising
Hysteresis
VENH
Max.
0 mA ≤ IOUT ≤ 1000 mA
IOUT = 0mA, Device is not switching
Shutdown Supply Current
Typ.
0 mA ≤ IOUT ≤ 600 mA
IOUT = 0mA, Device is
switching (Note 5)
Undervoltage
Threshold
Min.
1.9
150
mV
1.3
V
0.4
V
IEN
EN input bias current
EN = VIN or GND
0.01
0.1
µA
RDS-ON
PMOS On Resistance
VIN = VGS = 5.5V
250
350
mΩ
VIN = VGS = 2.5V
300
400
VIN = VGS = 5.5V
200
300
VIN = VGS = 2.5V
250
350
NMOS On Resistance
ILIM
P-channel current limit
2.5V < VIN < 5.5V
Oscillator frequency
mΩ
1300
1500
2000
mA
1000
1300
1500
KHz
0.1
1
1
µA
µA
Ilkg_(N)
N-channel leakage current
VDS = 5.5V
Ilkg_(P)
P-channel leakage current
VDS = 5.5V
0.1
Line regulation
IOUT ≤ 10 mA
0.16
%/V
Load regulation
350 mA ≤ IOUT ≤ 1000 mA
0.15
%
0.8
V
Vref
Reference Voltage
Output DC Voltage Accuracy 0 mA ≤ IOUT ≤ 1000 mA
(Note 6)
-3
Rising
Over-Temperature Protection PWM Mode Only
350 mA ≤ IOUT ≤ 1000 mA Temperature
Hysteresis
Start-Up Time
IOUT = 1000 mA, COUT = 20 µF
+3
150
%
°C
20
°C
800
µS
Notes:
5. Refer to the application section for further details.
6. For output voltages ≤ 1.2V a 40µF output capacitor value is required to achieve a maximum output accuracy of 3% while operating in power save
mode (PFM mode).
FAN2001/FAN2002 Rev. 1.0.2
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FAN2001/FAN2002 1A High-Efficiency Step-Down DC-DC Converter
Electrical Characteristics
TA = 25°C, CIN = 10µF, COUT = 20µF, L = 3.3µH, R2 = 10KΩ, unless otherwise noted.
Efficiency vs. Load Current
Efficiency vs. Load Current
100
95
Efficiency (%)
Efficiency (%)
90
85
VIN = 5V
80
V OUT = 3.3V
VIN = 3.6V
75
VIN = 3.6V
V OUT = 3V
VOUT = 1.2V
70
65
60
1
10
100
1000
100
95
90
85
80
75
70
65
60
55
50
45
40
35
V OUT = 3.3V
VIN = 3.9V
VIN = 5.5V
0.1
1
10
Load Current (mA)
100
1000
Load Current (mA)
Efficiency vs. Load Current
Output Voltage vs. Load Current
100
1.214
V OUT = 1.2V
1.212
R 2 = 100KΩ
1.210
90
Output Voltage (V)
80
Efficiency (%)
R 2 = 100KΩ
70
V IN = 5.5V
60
VIN = 2.5V
50
V IN = 3. 6V
40
VIN = 5V
1.208
1.206
1.204
1.202
1.200
1.198
1.196
1.194
30
1.192
0.1
1
10
100
1000
0
200
400
Load Current (mA)
1000
1400
80
Oscillator Frequency (kHz)
V OUT = 1. 2V
70
Quiescent Current (µA)
800
Frequency vs. Temperature
Quiescent Current vs. Input Voltage
60
50
40
600
Load Current (mA)
R 2 = 10KΩ
30
20
10
0
2.5
R 2 = 100KΩ
3.0
3.5
4.0
4.5
5.0
1360
1340
5.5
VIN = 5.5V
1320
1300
1280
V IN = 3.6V
1260
1240
1220
1200
-40
VIN = 2.5V
-20
0
20
40
60
80
100
Temperature (°C)
Input Voltage (V)
FAN2001/FAN2002 Rev. 1.0.2
1380
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FAN2001/FAN2002 1A High-Efficiency Step-Down DC-DC Converter
Typical Performance Characteristics
FAN2001/FAN2002 1A High-Efficiency Step-Down DC-DC Converter
Typical Performance Characteristics (Contd.)
TA = 25°C, CIN = 10µF, COUT = 20µF, L = 3.3µH, R2 = 10KΩ, unless otherwise noted.
Power Save Mode
Inductor
Current
(200mA/div)
Time (1µs/div)
Inductor Load Current
Current
Step
(500mA/div)
Load Transient Response
600mA
100mA
VOUT = 1.2V
Time (10µs/div)
Load Transient Response
100mA
600mA
VOUT = 1.2V
Time (10µs/div)
Voltage at
Inductor
Output
Enable Pin
Current
Voltage
(5V/Div)
(500mV/div) (500mA/div)
Start-Up Response
Inductor
Output
Current
Voltage
(200mA/div)
(500mV/div)
Voltage at
Enable Pin
(5V/Div)
Time (5µs/div)
Output
Voltage
(50mV/div)
Inductor
Load Current
Output
Current
Step
Voltage
(50mV/div) (500mA/div)
Inductor
Output
Voltage
Current
(200mA/div) (5mV/div)
Output SW Node
Voltage
Voltage
(20mV/div) (2V/div)
SW Node
Voltage
(2V/div)
PWM Mode
VOUT = 1.2V
IOUT = 10mA
VOUT = 1.2V
IOUT = 1000mA
Time (200µs/div)
Time (100µs/div)
FAN2001/FAN2002 Rev. 1.0.2
Start-Up Response
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VIN
EN
DIGITAL
SOFT START
UNDER-VOLTAGE
LOCKOUT
IS
REF
PFM
COMP
IS
CURRENT
SENSE
FB
ERROR
AMP
MOSFET
LOGIC
CONTROL
COMP
SW
DRIVER
0.8V
GND
IS
OVER
VOLTAGE
COMP
OSC
SLOPE COMPENSATION
REF
FB
NEG.
LIMIT
COMP
NEG.
LIMIT
SENSE
GND
Figure 3. Block Diagram
Detailed Operation Description
PFM mode the device operates with a variable frequency and
constant peak current, thus reducing the quiescent current to
minimum. Consequently, the high efficiency is maintained at
light loads. As soon as the output voltage falls below a threshold, set at 0.8% above the nominal value, the P-channel transistor is turned on and the inductor current ramps up. The Pchannel switch turns off and the N-channel turns on as the peak
inductor current is reached (typical 450mA).
The FAN2001/FAN2002 is a step-down converter operating in a
current-mode PFM/PWM architecture with a typical switching
frequency of 1.3MHz. At moderate to heavy loads, the converter
operates in pulse-width-modulation (PWM) mode. At light loads
the converter enters a power-save mode (PFM pulse skipping)
to keep the efficiency high.
PWM Mode
The N-channel transistor is turned off before the inductor current becomes negative. At this time the P-channel is switched
on again starting the next pulse. The converter continues these
pulses until the high threshold (typical 1.6% above nominal
value) is reached. A higher output voltage in PFM mode gives
additional headroom for the voltage drop during a load transient
from light to full load. The voltage overshoot during this load
transient is also minimized due to active regulation during turn
on of the N-channel rectifier switch. The device stays in sleep
mode until the output voltage falls below the low threshold. The
FAN2001/FAN2002 enters the PWM mode as soon as the output voltage can no longer be regulated in PFM with constant
peak current.
In PWM mode, the device operates at a fixed frequency of
1.3MHz. At the beginning of each clock cycle, the P-channel
transistor is turned on. The inductor current ramps up and is
monitored via an internal circuit. The P-channel switch is turned
off when the sensed current causes the PWM comparator to trip
when the output voltage is in regulation or when the inductor
current reaches the current limit (set internally to typically
1500mA). After a minimum dead time the N-channel transistor
is turned on and the inductor current ramps down. As the clock
cycle is completed, the N-channel switch is turned off and the
next clock cycle starts.
PFM (Power Save) Mode
100% Duty Cycle Operation
As the load current decreases and the inductor current reaches
negative value, the converter enters pulse-frequency-modulation (PFM) mode. The transition point for the PFM mode is given
by the equation:
I OUT = V OUT
As the input voltage approaches the output voltage and the duty
cycle exceeds the typical 95%, the converter turns the P-channel transistor continuously on. In this mode the output voltage is
equal to the input voltage minus the voltage drop across the Pchannel transistor:
1 – ( V OUT ⁄ V IN )
× ----------------------------------------2×L×f
VOUT = VIN – ILOAD × (RdsON + RL), where
RdsON = P-channel switch ON resistance
ILOAD = Output current
RL = Inductor DC resistance
The typical output current when the device enters PFM mode is
150mA for input voltage of 3.6V and output voltage of 1.2V. In
FAN2001/FAN2002 Rev. 1.0.2
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FAN2001/FAN2002 1A High-Efficiency Step-Down DC-DC Converter
Block Diagram
This is calculated as follows:
1 – ( V OUT ⁄ V IN )
∆I L = V OUT × ----------------------------------------L×f
The reference and the circuit remain reset until the VIN crosses
its UVLO threshold.
The FAN2001/FAN2002 has an internal soft-start circuit that
limits the in-rush current during start-up. This prevents possible
voltage drops of the input voltage and eliminates the output voltage overshoot. The soft-start is implemented as a digital circuit
increasing the switch current in four steps to the P-channel current limit (1500mA). Typical start-up time for a 20µF output
capacitor and a load current of 1000mA is 800µs.
where:
∆IL = Inductor Ripple Current
f = Switching Frequency
L = Inductor Value
Some recommended inductors are suggested in the table
below:
Short Circuit Protection
The switch peak current is limited cycle-by-cycle to a typical
value of 1500mA. In the event of an output voltage short circuit,
the device operates with a frequency of 400kHz and minimum
duty cycle, therefore the average input current is typically
200mA.
Inductor Value
Vendor
Part Number
3.3µH
Panasonic
ELL6PM3R3N
3.3µH
Murata
LQS66C3R3M04
Table 1: Recommended Inductors
Thermal Shutdown
Capacitors Selection
When the die temperature exceeds 150°C, a reset occurs and
will remain in effect until the die cools to 130°C, at that time the
circuit will be allowed to restart.
For best performances, a low ESR input capacitor is required. A
ceramic capacitor of at least 10µF, placed as close to the VIN
and AGND pins of the device is recommended. The output
capacitor determines the output ripple and the transient
response.
Applications Information
Setting the Output Voltage
Capacitor
Value
The internal reference is 0.8V (Typical). The output voltage is
divided by a resistor divider, R1 and R2 to the FB pin. The output voltage is given by:
10µF
Vendor
Part Number
Taiyo Yuden
JMK212BJ106MG
TDK
C2012X5ROJ106K
JMK316BJ106KL
R1
V OUT = V REF  1 + -------

R 2
C3216X5ROJ106M
Where R1 + R2 < 800KΩ.
Murata
According to this equation, and assuming desired output voltage of 1.5096V, and given R2 = 10KΩ, the calculated value of
R1 is 8.87KΩ. If quiescent current is a key design parameter a
higher value feedback resistor can be used (e.g. R2 = 100KΩ)
and a small bypass capacitor of 10pF is required in parallel with
the upper resistor as shown in Figure 4.
VIN
CIN
PGND
2
10µF
EN
6
P1
(AGND)
3
5
4
3.3µH
NC
Table 2: Recommended Capacitors
PCB Layout Recommendations
The recommended PCB layout is shown in Figures 5 and 6. The
inherently high peak currents and switching frequency of power
supplies require a careful PCB layout design.
VOUT
SW
1
GRM32ER61C106K
R1
Cf
50KΩ
1.2V (1A)
COUT
2 x 10µF
FB
R2
100KΩ
Figure 4. Setting the Output Voltage
Inductor Selection
The inductor parameters directly related to the device’s performances are saturation current and dc resistance. The FAN2001/
FAN2002 operates with a typical inductor value of 3.3µH. The
lower the dc resistance, the higher the efficiency. For saturation
current, the inductor should be rated higher than the maximum
load current plus half of the inductor ripple current.
FAN2001/FAN2002 Rev. 1.0.2
Figure 5. Recommended PCB Layout (FAN2001)
8
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FAN2001/FAN2002 1A High-Efficiency Step-Down DC-DC Converter
UVLO and Soft Start
For more board layout recommendations download the application note “PCB Grounding System and FAN2001/FAN2011 High
Performance DC-DC Converters” (AN-42036).
Figure 6. Recommended PCB Layout (FAN2002)
FAN2001/FAN2002 Rev. 1.0.2
9
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FAN2001/FAN2002 1A High-Efficiency Step-Down DC-DC Converter
Therefore, use wide traces for high current paths and place the
input capacitor, the inductor, and the output capacitor as close
as possible to the integrated circuit terminals. In order to minimize voltage stress to the device resulting from ever present
switching spikes, use an input bypass capacitor with low ESR.
Note that the peak amplitude of the switching spikes depends
upon the load current; the higher the load current, the higher the
switching spikes. The resistor divider that sets the output voltage should be routed away from the inductor to avoid RF coupling. The ground plane at the bottom side of the PCB acts as
an electromagnetic shield to reduce EMI.
FAN2001/FAN2002 1A High-Efficiency Step-Down DC-DC Converter
Mechanical Dimensions
3x3mm 6-Lead MLP
Ordering Information
Product Number
Output Voltage
Package Type
Order Code
FAN2001
Adjustable
3x3mm 6-Lead MLP
FAN2001MPX
FAN2002
Adjustable
3x3mm 6-Lead MLP
FAN2002MPX
FAN2001/FAN2002 Rev. 1.0.2
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FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION.
As used herein:
2. A critical component is any component of a life
1. Life support devices or systems are devices or
support device or system whose failure to perform can
systems which, (a) are intended for surgical implant into
be reasonably expected to cause the failure of the life
the body, or (b) support or sustain life, or (c) whose
support device or system, or to affect its safety or
failure to perform when properly used in accordance
with instructions for use provided in the labeling, can be
effectiveness.
reasonably expected to result in significant injury to the
user.
PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet Identification
Product Status
Definition
Advance Information
Formative or
In Design
This datasheet contains the design specifications for
product development. Specifications may change in
any manner without notice.
Preliminary
First Production
This datasheet contains preliminary data, and
supplementary data will be published at a later date.
Fairchild Semiconductor reserves the right to make
changes at any time without notice in order to improve
design.
No Identification Needed
Full Production
This datasheet contains final specifications. Fairchild
Semiconductor reserves the right to make changes at
any time without notice in order to improve design.
Obsolete
Not In Production
This datasheet contains specifications on a product
that has been discontinued by Fairchild semiconductor.
The datasheet is printed for reference information only.
Rev. I15
FAN2001/FAN2002 Rev. 1.0.2
11
www.fairchildsemi.com
FAN2001/FAN2002 1A High-Efficiency Step-Down DC-DC Converter
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