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Электронный компонент: FAN5601MP18X

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www.fairchildsemi.com
REV. 1.0.4 4/4/05
OUTPUT 1.0V t o 1.8V
C
B
= 1
F
INPUT 2.2V to 5.5V
C
IN
= 10
F
C
OUT
= 10
F
GND
V
OUT
C+
C-
ENABLE
V
IN
FAN5601
Features
> 85% Peak Efficiency
Low EMI
Low Ripple
Output Voltage 1.3V/1.8V
Input Voltage Range: 2.2V to 5.5V
Output Current: Up to 250mA
2.5% Output Voltage Accuracy
30
A Operating Current
I
CC
< 1
A in Shutdown Mode
2MHz Operating Frequency
Shutdown Isolates Output from Input
Soft-Start Limits Inrush Current
Short Circuit and Over Temperature Protection
Minimum External Component Count
6-Lead 3x3mm MLP Package
Applications
Cell Phones
Handheld Computers
Portable Electronic Equipment
Core Supply to Next Generation Processors
Low Voltage DC Bus
Digital Cameras
DSP Supplies
Description
The FAN5601 is an advanced third generation switched
capacitor step down DC/DC converter utilizing Fairchild's
proprietary ScalarPumpTM technology. This innovative archi-
tecture utilizes scalar switch re-configuration and fractional
switching techniques to produce low output ripple, low ESR
spikes and improve efficiency over a wide load range.
The FAN5601 produces a fixed regulated output from 2.2V
to 5V input voltage. Customized output voltages are avail-
able in 100mV increments from 1V to 1.8V. Contact market-
ing for customized outputs.
In order to maximize efficiency, the FAN5601 achieves
regulation by skipping pulses. Depending upon load current,
the size of the switches is scaled dynamically, consequently,
current spikes and EMI are minimized. An internal soft start
circuitry prevents excessive current drawn from the supply.
The device is internally protected against short circuit and
over temperature conditions.
The FAN5601 is available in 6-lead 3x3mm MLP.
ScalarPump
TM
is a registered trademark of Fairchild Semiconductor Corporation.
FAN5601
Regulated Step-Down Charge Pump DC/DC Converter
Typical Application
PRODUCT SPECIFICATION
FAN5601
2
REV. 1.0.4 4/4/05
Pin Assignment
Pin Description
Pin No.
Pin Name
Pin Function Description
6-Lead 3x3mm MLP
1
C+
Bucket Capacitor Positive Connection
2
C-
Bucket Capacitor Negative Connection
3
ENABLE
Enable Pin
4
GND
No Connection
5
V
OUT
No Connection
6
V
IN
Ground
ENABLE
C+
C-
GND
V
IN
V
OUT
6-Lead 3x3mm MLP
FAN5601
Top-View
1
2
3
6
5
4
FAN5601
PRODUCT SPECIFICATION
REV. 1.0.4 4/4/05
3
Absolute Maximum Ratings
(Note1)
Recommended Operating Conditions
Notes:
1. Operation beyond the absolute maximum rating may cause permanent damage to device.
2. Using Mil Std. 883E, method 3015.7(Human Body Model) and EIA/JESD22C101-A (Charge Device Model).
3. One square inch, 1oz bottom side GND plane connected to top side GND plane by field of via.
Parameter
Min
Max
Unit
V
IN
,V
OUT
, ENABLE to GND
-0.3
6.0
V
C+, C-, to GND
-0.3
V
IN
+ 0.3
V
V
OUT
Short Circuit Duration
INDEFINITE
Lead Soldering Temperature (10 seconds)
300
C
Operating Temperature Range
-40
+85
C
Junction Temperature
150
C
Storage Temperature
-55
150
C
Electrostatic Discharge (ESD) Protection (Note2)
HBM
4
kV
CDM
1
Parameter
Package
Min
Typ
Max
Unit
Input Voltage
2.2
5.5
V
Output Current
250
mA
Operating Ambient Temperature
-40
85
C
Thermal Resistance Junction to Tab
6-lead 3x3mm MLP
8
C/W
Thermal Resistance Junction to Ambient
6-lead 3x3mm MLP (Note 3)
90
C/W
PRODUCT SPECIFICATION
FAN5601
4
REV. 1.0.4 4/4/05
Electrical Characteristics
V
IN
= 2.2V to 5.5V, I
OUT
= 1mA, C
B
= 1F, C
IN
= 10F, C
OUT
= 10F, T
A
= -40C to +85C, typical values measured
at T
A
= 25C, unless otherwise noted.
Notes:
4. No load supply current is measured when the oscillator is off.
5. The short circuit protection is designed to protect against pre-existing short circuit conditions, i.e. assembly shorts that exist
prior to device power-up. The short circuit current limit is 25mA
Average
. Short circuit currents in normal operation are inherently
limited by the ON-resistance of internal device. Since this resistance is in the range of 1
, in some cases thermal shutdown
may occur. However, immediately following the first thermal shutdown event, the short circuit condition will be treated as pre-
existing, and the load current will reduce to 25mA
Average
.
Parameter
Conditions
Min.
Typ.
Max.
Units
Input Undervoltage Lockout
1.9
2.0
2.17
V
Output Voltage
Vnom
V
Output Voltage Accuracy
T
A
= 25C, V
IN
= 3.3V
-2
+2
%
V
IN
= 3.3V
-2.5
+2.5
%
Output Voltage Temperature Coefficient
V
IN
= 3.3V
25
ppm
Load Regulation
0.133
mV/mA
Line Regulation
T
A
= 25C
1.35
2
mV/V
No load Supply Current (Note 4)
I
OUT
= 0mA,
V
IN
= 2.2V
30
60
A
Shutdown Supply Current
ENABLE =GND.
V
OUT
= 0
0.1
1
A
Output Short-circuit Current (Note 5)
V
OUT
= GND.
25
mA
Efficiency
V
IN
= 2.35
V
OUT
I
OUT
=150mA
85
%
V
IN
at Configuration Change
From 2:1 to 1:1 mode
2.22 x
Vnom
V
Oscillator Frequency
2.0
MHz
Thermal Shutdown Threshold
150
C
Thermal Shutdown Threshold Hysteresis
15
C
ENABLE Logic Input High Voltage, V
IH
V
IN
= 2.2V to 5.5V
1.3
V
ENABLE Logic Input Low Voltage, V
IL
V
IN
= 2.2V to 5.5V
0.4
V
ENABLE Logic Input Current
ENABLE = V
IN
or GND
-1
1
A
V
OUT
Turn On Time
V
IN
= 3.6V, I
OUT
= 0mA,
10% to 90%
1
mS
FAN5601
PRODUCT SPECIFICATION
REV. 1.0.4 4/4/05
5
Typical Performance Characteristics
T
A
= 25C, C
IN
= C
OUT
=10
F, C
B
= 1
F, V
OUT
= 1.3V, unless otherwise noted.
0
20
40
60
80
100
120
140
160
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Input V
o
lta
g
e
(1V/div)
Ou
tput V
o
lt
ag
e
(5
0m
V
/
d
i
v)
Time (10
s/div)
V
IN
= 2 V to 4.4V
I
OUT
= 10mA
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
28
30
32
34
36
38
40
42
44
46
Input Voltage (V)
I
OUT
= 0mA
2.5
3.0
3.5
4.0
4.5
5.0
5.5
10
20
30
40
50
60
70
Input Current vs Input Voltage
Shutdown Current vs Input Voltage
Input Voltage (V)
Shutdo
wn Current
(nA)
V
OUT
= 0V
V
IN
= 4.4V
V
IN
= 2V
-60
-40
-20
0
20
40
60
80
100
120
140
1.26
1.27
1.28
1.29
1.30
1.31
Output Voltage vs Ambient Temperature
Ambient Temperature (
C)
Output Voltage (V)
I
OUT
= 10mA
V
IN
= 4V
In
put
Curre
nt (
A)
Mode Change Threshold and Hysteresis
vs Load Current
Threshold and Hysteresis (V)
Hysteresis
Low Threshold
High Threshold
Load Current (mA)
Line Transient Response
Load Transient Response
Output
V
o
lta
g
e
(2
0m
V
/
d
i
v)
Lo
ad
Curre
nt
(100m
A/div)
Time (1ms/div)
V
IN
= 3.3V
I
OUT
= 1mA
I
OUT
= 100mA
PRODUCT SPECIFICATION
FAN5601
6
REV. 1.0.4 4/4/05
Typical Performance Characteristics
(cont.)
T
A
= 25C, C
IN
= C
OUT
=10
F, C
B
= 1
F, V
OUT
= 1.3V, unless otherwise noted.
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
0.7
0.8
0.9
1.0
1.1
1.2
1.3
V
IN
(V)
V
En
a
b
l
e

(V)
I
OUT
= 10mA
T
A
= 25
C
Time (400 s/div)
Enable Voltage
(5V/div)
Output Voltage
(500m V/div)
Enable Threshold vs Input Voltage
Enable Delay
I
OUT
= 10mA
V
IN
= 2.2V
Output Ripple
(10mV/div)
Output Ripple
(2mV/div)
Output Ripple
(10mV/div)
Output Ripple
(10mV/div)
I
OUT
= 1.3
A
V
IN
= 2.2V
V
OUT
= 1.3V
Output Ripple
Output Ripple
Output Ripple
Output Ripple
Time (40ms/div)
Time (40ms/div)
Time (20ms/div)
Time (20ms/div)
I
OUT
= 1.3
A
V
IN
= 2.7V
V
OUT
= 1.3V
I
OUT
= 1.3
A
V
IN
= 3.6V
V
OUT
= 1.3V
I
OUT
= 1.3
A
V
IN
= 4.2V
V
OUT
= 1.3V
FAN5601
PRODUCT SPECIFICATION
REV. 1.0.4 4/4/05
7
Typical Performance Characteristics
(cont.)
T
A
= 25C, C
IN
= C
OUT
=10
F, C
B
= 1
F, V
OUT
= 1.3V, unless otherwise noted.
Output Ripple
Output Ripple
Output Ripple
Output Ripple
Output Ripple
Output Ripple
Time (20ms/div)
Output Ripple
(1
0
m
V
/
div)
I
OUT
= 1.3
A
V
IN
= 5.5V
V
OUT
= 1.3V
Time (100
s/div)
Output Ri
ppl
e
(1
0m
V/d
iv)
I
OUT
= 10mA
V
IN
= 2.2V
V
OUT
= 1.3V
Time (100
s/div)
Output Ripple
(1
0mV/di
v)
I
OUT
= 10mA
V
IN
= 3.6V
V
OUT
= 1.3V
Time (100
s/div)
Ou
t
p
ut Ripple
(1
0m
V
/
d
i
v)
I
OUT
= 10mA
V
IN
= 5.5V
V
OUT
= 1.3V
Time (100
s/div)
Outp
ut Ri
ppl
e
(1
0m
V/d
iv)
I
OUT
= 10mA
V
IN
= 2.7V
V
OUT
= 1.3V
Time (100
s/div)
Output Ri
ppl
e
(1
0m
V/d
iv)
I
OUT
= 10mA
V
IN
= 4.2V
V
OUT
= 1.3V
PRODUCT SPECIFICATION
FAN5601
8
REV. 1.0.4 4/4/05
Typical Performance Characteristics
(cont.)
T
A
= 25C, C
IN
= C
OUT
=10
F, C
B
= 1
F, V
OUT
= 1.3V, unless otherwise noted.
Output Ripple
Output Ripple
Output Ripple
Output Ripple
Output Ripple
Time (10
s/div)
I
OUT
= 150mA
V
IN
= 2.2V
V
OUT
= 1.3V
Time (10
s/div)
I
OUT
= 150mA
V
IN
= 2.7V
V
OUT
= 1.3V
Time (10
s/div)
I
OUT
= 150mA
V
IN
= 3.6V
V
OUT
= 1.3V
Time (1
s/div)
I
OUT
= 150mA
V
IN
= 4.2V
V
OUT
= 1.3V
Time (1
s/div)
Output Ripple
(20mV/div)
Output Ripple
(20mV/div)
Output Ripple
(20mV/div)
Output Ripple
(20mV/div)
Output Ripple
(20mV/div)
I
OUT
= 150mA
V
IN
= 5.5V
V
OUT
= 1.3V
FAN5601
PRODUCT SPECIFICATION
REV. 1.0.4 4/4/05
9
Typical Performance Characteristics
(cont.)
T
A
= 25C, C
IN
= C
OUT
=10
F, C
B
= 1
F, V
OUT
= 1.3V, unless otherwise noted.
0
10
20
30
40
50
60
70
80
90
100
Load Current = 1mA
Load Current = 10mA
Load Current = 50mA
Load Current = 100mA
Load Current = 150mA
Load Current = 250mA
0
50
100
150
200
250
300
78
80
82
84
86
88
1
2
3
4
5
6
Ouput Voltage (V)
Ouput Voltage (V)
0.95
1.00
1.05
1.10
1.15
1.20
1.25
1.30
1.35
Load Current = 1mA
Load Current = 10mA
Load Current = 50mA
Load Current = 100mA
Load Current = 150mA
Load Current = 250mA
0
50
100
150
200
250
300
1.20
1.22
1.24
1.26
1.28
1.30
1.32
TA = -40C
TA = 0
C
TA = 80
C
TA = 125
C
Input Voltage (V)
1
2
3
4
5
6
Input Voltage (V)
Output Voltage vs Input Voltage
Efficiency vs Input Voltage
Output Voltage vs Load Current
Peak Efficiency vs Load Current
Efficiency (%)
Peak Efficiency (%)
Load Current (mA)
Load Current (mA)
V
IN
= 4.5V
V
IN
= 2.95V
T
A
= 25
C
V
OUT
= 1.3V
T
A
= 25
C
PRODUCT SPECIFICATION
FAN5601
10
REV. 1.0.4 4/4/05
Detailed Description
The FAN5601 switched capacitor DC/DC converter auto-
matically configures switches to achieve a high efficiency
and provides a regulated output voltage by means of pulse
skipping, pulse frequency modulation (PFM). An internal
soft start circuit prevents excessive inrush current drawn
from the supply. Each switch is split into three segments.
Based on the values of V
IN
,
V
OUT
and I
OUT
, an internal cir-
cuitry determines the number of segments to be used to
reduce current spikes.
Step-Down Charge Pump Operation
When V
IN
2.22 V
OUT
, a 2:1 configuration shown in
Fig.1(A) is enabled. The factor 0.9 is used instead of 1 in
order to account for the effect of resistive losses across the
switches and to accommodate hysteresis in the voltage detec-
tor comparator. Two phase non-overlapping clock signals are
generated to drive four switches. When switches 1 and 3 are
ON, switches 2 and 4 are OFF and C
B
is charged. When
switches 2 and 4 are ON, switches 1 and 3 are OFF, charge is
transferred from C
B
to C
OUT
.
When V
IN
<2.22
V
OUT
, a 1:1 configuration shown in
Fig. 1(B) is enabled. In the 1:1 configuration switch 3 is
always OFF and the switch 4 is always ON. At 1.6V output
setting the configuration changes from 2:1 to 1:1 at V
IN
=
3.56V. At 1.3V output setting the change occurs at V
IN
=
3.06V
.
Pulse-skipping PFM and Fractional Switch
Operation
When the regulated output voltage reaches its upper limit,
the switches are turned off the output voltage reaches its
lower limit. Considering a step-down 2:1 mode of operation,
1.6V output as an example, when the output reaches about
1.62V(upper limit), the control logic turns off all switches.
Switching stops completely. This is pulse-skipping mode.
Since the supply is isolated from the output, the output volt-
age will drop. Once the output is dropped to about
1.58V(lower limit), the device will return to regular switch-
ing mode with one quarter of each switch turning on first.
Another quarter of each switch will be turned on if V
OUT
cannot reach regulation by the time of arrival of the third
Block Diagram
UVLO
+
-
SHUTDOWN
CONTROL
LOGIC
CONFIGURATION
PULSE_SKIP
SHORT_CKT.
+
-
+
-
+
-
THERMAL
SHUTDOWN
IN
OUT
V
ref RAMP
FB
OUTPUT
150mV
1V
0.5* INPUT
VOLTAGE
REF.
SOFT START
V
ref RAMP
OSCILLATOR
(2MHz)
C+
C-
ENABLE
V IN
GND.
D
R
I
V
E
R
S
0.25SW1
0.25SW1
0.25SW4
0.25SW4 0.5SW4
0.25SW3
0.25SW3 0.5SW3
0.5SW2
0.25SW2
0.25SW2
0.5SW1
FB
VOUT
FAN5601
PRODUCT SPECIFICATION
REV. 1.0.4 4/4/05
11
charge cycle. Full switch operation occurs only during star-
tup or under heavy load condition, when half switch opera-
tion cannot achieve regulation within seven charge cycles.
Soft Start
The soft-start feature limits inrush current when the device is
initially powered up and enabled. The reference voltage is
used to control the rate of the output voltage ramp-up to its
final value. Typical start-up time is 1ms. Since the rate of the
output voltage ramp-up is controlled by an internally gener-
ated slow ramp, pulse-skipping occurs and inrush current is
automatically limited.
Shutdown, UVLO, Short Circuit Current Limit
and Thermal Shutdown
The device has an active-low shutdown pin to decrease sup-
ply current to less than 1
A. In shutdown mode the supply is
disconnected from the output. UVLO triggers when supply
voltage drops below 2V. When the output voltage is lower
than 150mV, a short circuit protection is triggered. In this
mode 15 out of 16 pulses during the switching will be
skipped and the supply current is limited. Thermal shutdown
triggers at 150C.
Switch Configuration
S1
S2
S3
S4
V
IN
GND
C+
VOUT
C-
C
OUT
2:1 configuration
Switches in charging phase
Reverse all switches for pumping phase
C
B
S1
S3
S4
V
IN
GND
C+
VOUT
C-
C
OUT

1:1 configuration
Switch 3 is always off and
Switch 4 is always on
Switches 1 and 2 are in phase 1
Reverse the position of switches 1&2
for phase 2
C
B
S2
Figure 1. (A)
Figure 1. (B)
PRODUCT SPECIFICATION
FAN5601
12
REV. 1.0.4 4/4/05
Applications Information
Proper operation of the FAN5601 requires one ceramic
bucket capacitor in the 0.1F to 1F range; one 10F output
bypass capacitor and one 10F input bypass capacitor. In
order to obtain optimum output ripple and noise perfor-
mance, use of low ESR (<0.05
) ceramic input and output
bypass capacitors is recommended. The X5R and X7R
rated capacitors provide adequate performance over the
-40C to 85C temperature range.
The value of the bucket capacitor is dependent on load cur-
rent requirements. A 1F bucket capacitor will work well in
all applications at all load currents, while a 0.1F capacitor
will support most applications under 100mA of load current.
The choice of bucket capacitor values should be verified in
the actual application at the lowest input voltage and highest
load current. A 30% margin of safety is recommended in
order to account for the tolerance of the bucket capacitor and
the variations in the on-resistance of the internal switches.
One of the key benefits of the ScalarPumpTM architecture is
that the dynamically scaled on-resistance of the switches
effectively reduces the peak current in the bucket capacitor
and therefore input and output ripple current is also reduced.
Nevertheless, due to the ESR of the input and output bypass
capacitors, these current spikes generate voltage spikes at the
input and output pins. However, these ESR spikes can be
easily filtered because their frequency lie at up to 12 times
the clock frequency.
In applications where conductive and radiated EMI/RFI
interference has to be kept as low as possible, the user may
consider the use of additional input and output filtering. For
example, adding an L-C filter to the standard output bypass
configuration is very effective in reducing both the output
ripple and the voltage spikes. Figure 2 shows an L-C filter
using a 100nH chip inductor and a 1F capacitor. The chan-
nel 1 of Figure 3 shows the ripple voltage at the output of the
device while Channel 2 shows the ripple voltage at the out-
put of the filter at V
IN
= 3.3V,
V
OUT
= 1.3V and I
OUT
= 100mA. Similar filtering method
will greatly reduce the current spikes at the input. The user
should be mindful of considering resistive voltage drops in
the inductors connected serially in the input and output
leads.
Figure 3. Effect of L-C Filter on output ripple
While evaluating the FAN5601 (or any other switched
capacitor DC-DC converter) the user should be careful to
keep the power supply source impedance low; use of long
wires causing high lead inductances and resistive losses
should be avoided. A carefully laid out ground plane is
essential because current spikes are generated as the bucket
capacitor is charged and discharged. The input and output
bypass capacitors should be placed as close to the device
pins as possible.
Time (10
s/div)
Output Ripple
(10mV/di
v)
I
OUT
= 100mA
V
IN
= 3.3V
V
OUT
= 1.3V
Ripple at
C
F
(1
0mV/d
iv)
Figure 2. Optional L-C Filter
INPUT 2.2V to 5.5V
C
B
= 1
F
V
IN
V
OUT
ENABLE
FAN5601
GND
C
OUT
= 10
F
C+
C
C
F
= 1
F
L
F
= 100nH Output 1.0V to 1.8V
C
IN
= 10
F
FAN5601
PRODUCT SPECIFICATION
REV. 1.0.4 4/4/05
13
Mechanical Dimensions
6-Lead 3x3mm MLP Package
B. DIMENSIONS ARE IN MILLIMETERS.
C. DIMENSIONS AND TOLERANCES PER ASME Y14.5M, 1994
NOTES:
A. CONFORMS TO JEDEC REGISTRATION MO-229,
VARIATION WEEA, DATED 11/2001
0.10
C A B
0.05
C
TOP VIEW
BOTTOM VIEW
RECOMMENDED LAND PATTERN
0.15
C
0.08
C
3.0
3.0
0.05
0.00
2.25
1.65
1.90
0.15
C
2X
2X
0.45
0.20
0.8 MAX
SIDE VIEW
SEATING
PLANE
0.10
C
PIN #1 IDENT
1
3
4
6
0.2 MIN
2.10
1.65
2.45
0.65 TYP
0.95 TYP
3.50
(0.70)
0.30~0.45
(0.20)
0.95
PRODUCT SPECIFICATION
FAN5601
LIFE SUPPORT POLICY
FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body, or
(b) support or sustain life, and (c) whose failure to perform
when properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to
result in a significant injury of the user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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Ordering Information
Product Number
Package Type
Voltage Option [Vnom]
Order Code
FAN5601
6-Lead 3x3mm MLP
1.3V
FAN5601MP13X
6-Lead 3x3mm MLP
1.8V
FAN5601MP18X