NCP1411
Sync−Rect PFM Step−Up
DC−DC Converter with
Low−Battery Detector and
Ring−Killer
NCP1411 is a monolithic micropower high frequency Boost
(step−up) voltage switching converter IC specially designed for
battery operated hand−held electronic products up to 250 mA loading.
It integrates Synchronous Rectifier for improving efficiency as well as
eliminating the external Schottky Diode. High switching frequency
(up to 600 kHz) allows low profile inductor and output capacitor being
used. Low−Battery Detector, Logic−Controlled Shutdown and
Cycle−by−Cycle Current Limit provide value−added features for
various battery−operated applications. The innovative Ring−Killer
circuitry guarantees quiet operation in discontinuous conduction
mode. With all these functions ON, the device quiescent supply
current is only 9.0
mA
typical. This device is available in the space
saving compact Micro8t package.
Features
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MARKING
DIAGRAM
8
1
Micro8
DM SUFFIX
CASE 846A
A2
AYW
A2
A
Y
W
= Device Marking
= Assembly Location
= Year
= Work Week
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
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•
Pb−Free Package is Available
High Efficiency, up to 92%
Very Low Device Quiescent Supply Current of 9.0
mA
Typical
Built−in Synchronous Rectifier (P−FET) Eliminates One External
Schottky Diode
High Switching Frequency (up to 600 kHz) Allows use of Small Size
Inductor
High Accuracy Reference Output, 1.19 V
$
0.6% @ 25°C, can
supply more than 2.5 mA when V
OUT
≥
3.3 V
Ring−Killer for Quiet Operation in Discontinuous Conduction Mode
1.0 V Startup at No Load Guaranteed
Output Voltage from 1.5 V to 5.5 V Adjustable
Output Current up to 250 mA @ V
IN
= 2.5 V, V
OUT
= 3.3 V
Logic−Controlled Shutdown
Open Drain Low−Battery Detector Output
1.0 A Cycle by Cycle Current Limit
Low Profile and Minimum External Parts
Compact Micro8 Package
PIN CONNECTIONS
FB 1
LBI/EN 2
LBO 3
REF 4
(Top View)
8 OUT
7 LX
6 GND
5 BAT
ORDERING INFORMATION
Device
NCP1411DMR2
NCP1411DMR2G
Package
Micro8
Micro8
(Pb−Free)
Shipping†
4000 Tape & Reel
4000 Tape & Reel
Typical Applications
Personal Digital Assistant (PDA)
Handheld Digital Audio Product
Camcorder and Digital Still Camera
Handheld Instrument
Conversion from One or Two NiMH or NiCd, or One Li−ion Cell
to 3.3 V/5.0 V
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
©
Semiconductor Components Industries, LLC, 2006
July, 2006
−
Rev. 4
1
Publication Order Number:
NCP1411/D
NCP1411
Input
1 V to
V
OUT
220 pF
200 k
Low Battery
Sense Input
Shutdown
Open Drain
Input
Low Battery
Open Drain
Output
10
mF
22
mH
150 pF
350 k
1
2
FB
NCP1411
OUT
LX
GND
BAT
8
7
6
5
33
mF
+
Output 1.5 to 5.5 V
I
OUT
Typical
Up to 250 mA at
3.3 V Output
and 2.5 V Input
R
LB1
R
LB2
3
4
LBI/EN
LBO
REF
C
EN
120 nF
150 nF
Figure 1. Typical Operating Circuit
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PIN FUNCTION DESCRIPTION
Pin #
1
2
3
4
5
6
7
8
Symbol
FB
Pin Description
Output Voltage Feedback Input.
LBI/EN
LBO
REF
BAT
GND
LX
OUT
Low−Battery Detector Input and IC Enable.
Open−Drain Low−Battery Detector Output. Output is LOW when V
LBI
is < 1.178 V. LBO is high impedance during
shutdown.
1.190 V Reference Voltage Output, bypassing with 150 nF capacitor if this pin is not loaded, bypassing with 1.0
mF
if this pin is loaded up to 2.5 mA @ V
OUT
= 3.3 V.
Battery input connection for internal Ring−Killer.
Ground.
N−Channel and P−Channel Power MOSFET Drain Connection.
Power Output. OUT also provides bootstrapped power to the device.
MAXIMUM RATINGS
Rating
Device Power Supply (Pin 8)
Input/Output Pins (Pins 1−5, Pin 7)
Thermal Characteristics
−
Micro8 Plastic Package
Maximum Power Dissipation @ T
A
= 25°C
Thermal Resistance, Junction−to−Air
Operating Junction Temperature Range
Operating Ambient Temperature Range
Storage Temperature Range
Symbol
V
OUT
V
IO
P
D
R
qJA
T
J
T
A
T
stg
Value
−0.3
to 6.0
−0.3
to 6.0
520
240
−40
to +150
−40
to +85
−55
to +150
Unit
V
V
mW
°C/W
°C
°C
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. This device contains ESD protection and exceeds the following tests:
Human Body Model (HBM)
"2.0
kV per JEDEC standard: JESD22−A114.
Machine Model (MM)
"200
V per JEDEC standard: JESD22−A115.
2. The maximum package power dissipation limit must not be exceeded.
PD
+
TJ(max)
*
TA
R
qJA
3. Latchup Current Maximum Rating:
"150
mA per JEDEC standard: JESD78.
4. Moisture Sensitivity Level: MSL 1 per IPC/JEDEC standard: J−STD−020A.
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2
NCP1411
ELECTRICAL CHARACTERISTICS
(V
OUT
= 3.3 V, T
A
= 25°C for typical value,
−40°C
≤
T
A
≤
85°C for min/max values
unless otherwise noted.)
Characteristic
Operating Input Voltage
Output Voltage Range (Adjusted by external feedback)
Reference Voltage (C
REF
= 150 nF, under no loading, T
A
= 25°C)
Reference Voltage
(C
REF
= 150 nF, under no loading,
−40°C
≤
T
A
≤
85°C)
Reference Voltage Temperature Coefficient
Reference Voltage Load Current
(V
OUT
= 3.3 V, V
REF
= V
REF_NL
±1.5%,
C
REF
= 1.0
mF)
(Note 5)
Reference Voltage Load Regulation
(V
OUT
= 3.3 V, I
LOAD
= 0 to 100
mA,
C
REF
= 1.0
mF)
Reference Voltage Line Regulation
(V
OUT
from 1.5 V to 5.5 V, C
REF
= 1.0
mF)
FB, LBI Input Threshold (I
LOAD
= 0 mA)
N−FET ON Resistance
P−FET ON Resistance
LX Switch Current Limit (N−FET)
Operating Current into OUT
(V
FB
= 1.4 V, i.e. no switching, V
OUT
= 3.3 V)
Shutdown Current into OUT (LBI/EN = GND)
LX Switch MAX. ON−Time (V
FB
= 1.0 V, V
OUT
= 3.3 V)
LX Switch MIN. OFF−Time (V
FB
= 1.0 V, V
OUT
= 3.3 V)
FB Input Current
Shutdown Current into BAT (LBI/EN = 0 V, V
OUT
= V
BAT
= 3.0 V)
BAT to LX resistance (V
FB
= 1.4 V, V
OUT
= 3.3 V)
LBI/EN Input Current
LBO Low Output Voltage (V
LBI
= 0 V, I
SINK
= 1.0 mA)
ENABLE (Pin 2) Input threshold, Low
ENABLE (Pin 2) Input threshold, High
5. Loading capability increases with V
OUT
.
Symbol
V
IN
V
OUT
V
REF_NL
V
REF_NL_A
TC
VREF
I
REF
V
REF_LOAD
V
REF_LINE
V
FB,
V
LBI
R
DS(ON)−N
R
DS(ON)−P
I
LIM
I
Q
I
SD
t
ON
t
OFF
I
FB
I
LBT
R
LBT_LX
I
LBI/EN
V
LBO_L
V
EN
V
EN
Min
1.0
V
IN
1.183
1.178
−
2.5
−
−
1.174
−
−
−
−
−
1.2
0.25
−
−
−
−
−
−
0.6
Typ
−
−
1.190
−
0.03
−
0.015
0.03
1.190
0.6
0.9
1.0
9.0
0.05
1.4
0.31
1.5
50
100
1.5
−
−
−
Max
5.5
5.5
1.197
1.202
−
−
1.0
1.0
1.200
−
−
−
14
1.0
1.8
0.37
9.0
−
−
8.0
0.05
0.3
−
Unit
V
V
V
V
mV/°C
mA
mV
mV/V
V
W
W
A
mA
mA
mS
mS
nA
nA
W
nA
V
V
V
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NCP1411
V
BAT
M3
BAT
5
Chip
Enable
ZLC
+
−
+
20 mV
V
DD
M2
V
DD
M1
GND
LX
7
OUT
8
V
OUT
CONTROL LOGIC
_ZCUR
_MSON
_MAINSW2ON
_PWQONCE
_CEN
_PFM
_MAINSWOFD
_SYNSW2ON
SENSE-
FET
FB
1
6
V
DD
+
−
GND
PFM
REF
4
Voltage
Reference
_SYNSWOFD
_V
REFOK
_ILIM
ILIM
+
−
+
−
+
GND
GND
R
SENSE
LBO
3
LBI/EN
2
GND
Figure 2. Simplified Functional Diagram
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NCP1411
TYPICAL OPERATING CHARACTERISTICS
1.220
V
REF
, REFERENCE VOLTAGE (V)
1.215
1.210
1.205
1.200
1.195
1.190
1
V
IN
= 3.0 V
10
100
I
LOAD
, OUTPUT CURRENT (mA)
V
REF
, REFERENCE VOLTAGE (V)
V
OUT
= 3.3 V
L = 22
mH
C
IN
= 10
mF
C
OUT
= 33
mF
C
REF
= 1
mF
T
A
= 25°C
1.195
V
IN
= 1.8 V
1.192
1.189
1.186
1.183
1.180
C
REF
= 1
mF
T
A
= 25°C
1
I
REF
= 0 mA
V
IN
= 2.2 V
I
REF
= 2.5 mA
1000
3
4
5
V
OUT
, INPUT VOLTAGE AT OUT PIN (V)
2
6
Figure 3. Reference Voltage versus Output
Current
1.194
V
REF
, REFERENCE VOLTAGE (V)
1.5
Figure 4. Reference Voltage versus Input
Voltage at OUT Pin
1.192
1.190
1.188
1.186
1.184
−40
V
OUT
= 3.3 V
C
REF
= 150 nF
I
REF
= 0 mA
−20
0
20
40
60
80
T
A
, AMBIENT TEMPERATURE (°C)
100
R
DS(on)
, SWITCH ON RESISTANCE (W)
1.2
0.9
0.6
0.3
0
−40
V
OUT
= 3.3 V
−20
P−FET (M2)
N−FET (M1)
40
60
80
0
20
T
A
, AMBIENT TEMPERATURE (°C)
100
Figure 5. Reference Voltage versus
Temperature
V
BATT
, MIN. STARTUP BATTERY VOLTAGE (V)
Figure 6. Switch ON Resistance versus
Temperature
1.8
L
X
, SWITCH MAX. ON TIME (t
on
/mS)
1.7
1.6
1.5
1.4
1.3
1.2
−40
1.9
WITHOUT SCHOTTKY DIODE
1.6
1.4
1.1
0.9
0.6
0
100
40
60
80
I
LOAD
, OUTPUT LOADING CURRENT (mA)
20
120
WITH SCHOTTKY DIODE
(MBR0502)
−20
0
20
40
60
80
T
A
, AMBIENT TEMPERATURE (°C)
Temperature
100
Figure 7.
L
X
Switch Max. ON Time versus
Figure 8. Min. Startup Battery Voltage versus
Loading Current
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