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NCP1500
Dual Mode PWM/Linear
BUCK Converter
The NCP1500 is a dual mode converter that operates as either a
pulse width modulated (PWM) buck converter or as a linear regulator.
The converter automatically transitions between the two modes. The
converter operates as a PWM when a synchronization signal is present
at the sync input. The converter operates as a linear regulator in the
absence of a synchronization signal. The PWM mode offers excellent
performance at normal to heavy loads at the sacrifice of output ripple
voltage. The linear mode offers excellent noise rejection at the
sacrifice of system efficiency. The user is able to select which mode
will give the best performance for a given operating condition.
Internal protection features include thermal shutdown with hysteresis
and cycle−by−cycle current limit in the PWM mode. Additionally, the
converter transitions into PFM mode at very light loads if a
synchronization signal is present and an output overvoltage condition
is detected.
PWM Features
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MARKING
DIAGRAM
8
8
1
Micro8t
(MSOP−8)
DM SUFFIX
CASE 846A
1
1500
AYWG
G
•
Current Mode Control with Cycle−by−Cycle Current Limit
•
Nominal Synchronization Frequency of 270 to 630 kHz
•
Built−in Slope Compensation
Linear Regulator Features
A
= Assembly Location
Y
= Year
W
= Work Week
G
= Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
SHD
SYN
V
O
LX
1
2
3
4
(Top View)
8
7
6
5
CB0
CB1
GND
V
IN
•
Low Output Noise
Overall Features
•
Thermal Shutdown with Hysteresis
•
Digitally Programmable Output Voltage Between 4 Voltages:
•
•
•
•
•
1.0, 1.3, 1.5, and 1.8
Fast Transient Response
Input Voltage Range From 2.7 V to 5.4 V
Space Saving Micro8 Package
Low Shutdown Current of 0.18
mA
Typical
Pb−Free Package is Available
ORDERING INFORMATION
Device
NCP1500DMR2
NCP1500DMR2G
Package
Micro8
Micro8
(Pb−Free)
Shipping
†
4000 Tape/Reel
4000 Tape/Reel
Typical Applications
•
Baseband Supplies for Portable Handsets
•
PDAs
•
Supplies for DSP Circuitry
1 SHD
2 SYN
3 V
O
L
C
OUT
4 LX
MBRM120
CB0
CB1
GND
V
IN
8
7
6
5
C
IN
V
IN
†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.
L = 15
mH
C
IN
= 10
mF
C
OUT
= 10
mF
Figure 1. Typical Operating Circuit
©
Semiconductor Components Industries, LLC, 2010
November, 2010
−
Rev. 5
1
Publication Order Number:
NCP1500/D
NCP1500
PIN FUNCTION DESCRIPTIONS
Pin #
1
Symbol
SHD
Pin Description
Device is placed in shutdown when SHD is driven low. In shutdown mode, the internal MOSFET and output
are turned off. Driven to high for normal operation. This pin is floating internally and needs to be tied to a
fixed source externally.
External Synchronization Clock Signal Input. If a clock signal is present at this pin, the device will go into
PWM mode. If SYN is driven low, the device operates in linear mode.
Connected to internal voltage divider for feedback.
Pin for the connection between the drain of the internal P−MOSFET and the external inductor.
Voltage Supply Input. Bypass with 10
mF
capacitor.
Ground.
Control Bit 1 Input for output voltage level selection. Internally pulled low.
Control Bit 0 Input for output voltage level selection. Internally pulled low.
2
3
4
5
6
7
8
SYN
V
O
LX
V
IN
GND
CB1
CB0
ABSOLUTE MAXIMUM RATINGS
Rating
Power Supply (Pin 5)
Input/Output Pins
Pin 1−4 & Pin 7−8
Thermal Characteristics
Micro8 Plastic Package
Thermal Resistance Junction to Air
Operating Junction Temperature Range
Operating Ambient Temperature Range
Storage Temperature Range
1. This device series 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. Latch−up Current Maximum Rating:
$150
mA per JEDEC standard: JESD78.
Symbol
V
IN
V
IO
Value
−0.3
to 6.0
−0.3
to 6.0
Unit
V
V
R
qJA
T
J
T
A
T
stg
240
−40
to +140
−
40 to +85
−
55 to +150
°C/W
°C
°C
°C
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2
NCP1500
ELECTRICAL CHARACTERISTICS
(V
IN
= 3.6 V, V
O
= 1.5 V, T
A
= 25°C, Fsyn = 600 kHz 50% Duty Cycle sinewave with V
H
= 2.0 V
and V
L
= 0 V for PWM mode; T
A
=
−40
to 85°C for Min/Max values, unless otherwise noted.)
Characteristic
Input Voltage Range
Main FET Leakage Current (Pins 5 to 4) T
A
= 25°C
Main FET Leakage Current (Pins 5 to 4)
T
A
=
−40°C
to 85°C
Mode Selection Pin
SYN “H” Input Voltage
SYN “L” Input Voltage
SYN “H” Input Current
SYN “L” Input Current
External Synchronization Frequency
Output Level Selection Pins
CB “H” Input Voltage Threshold
CB “L” Input Voltage Threshold
CB “H” Input Current
CB “L” Input Current
Shutdown Pin
SHD “H” Input Voltage Threshold
SHD “L” Input Voltage Threshold
SHD “H” Input Current
SHD “L” Input Current
PWM Mode
Output Voltage (I
OUT
= 35 mA, T
A
= 25°C)
CB0, CB1 = (H, H)
CB0, CB1 = (H, L)
CB0, CB1 = (L, L)
CB0, CB1 = (L, H)
Line Regulation, I
out
= 100 mA
3.0 to 3.6 V
3.0 to 4.2 V
Load Regulation
50 to 120 mA
20 to 200 mA
Minimum On−Time
Internal PFET ON−Resistance (I
LX
= 400 mA, V
IN
= 2.0 V)
Main Output Switch Current Limit
Linear Regulator Mode (Lx shorted to Vo)
Output Voltage (I
out
= 0 mA, T
A
= 25°C)
CB0, CB1 = (H, H)
CB0, CB1 = (H, L)
CB0, CB1 = (L, L)
CB0, CB1 = (L, H)
Startup Current Load in Linear Mode
Overvoltage Protection
Output Overvoltage Threshold in PWM Mode
Total Device
Power Supply Current
Standby (SHD tied low, V
IN
= 3.6 V, SYN tied low) T
A
= 25°C
T
A
=
−40°C
to 85°C
PWM Mode (SHD tied high, V
IN
= 3.6 V, V
out
= 1.6 V, V
CB0
= V
CB1
= 0 V,
SYN @ 600 kHz/50% duty cycle, I
out
= 0 mA)
Linear Mode (SHD tied high, V
IN
= 3.6 V, V
out
= 1.5 V, SYN tied low,
I
out
= 0 mA)
I
CC
−
−
−
−
0.18
−
96
30
0.5
10
150
70
mA
VO
PFM
−
+5.0
+10
%
V
out0
0.941
1.235
1.425
1.710
80
0.99
1.30
1.50
1.80
−
1.050
1.365
1.575
1.890
−
V
V
OUT0
0.941
1.235
1.425
1.710
−
−
−
−
−
−
−
0.99
1.30
1.50
1.80
1.0
2.0
1.0
13
210
0.65
800
1.050
1.365
1.575
1.890
−
−
−
−
−
1.2
−
V
V
SHDH
V
SHDL
I
SHDH
I
SHDL
0.59
−
−
−
−
−
0.1
0
−
0.26
−
−
V
V
mA
mA
V
CBH
V
CBL
I
CBH
I
CBL
0.90
−
−
−
−
−
0.1
0
−
0.63
−
−
V
V
mA
mA
V
SYNH
V
SYNL
I
SYNH
I
SYNL
F
SYNC
1.3
−
−
−0.5
270
−
−
0
0
−
−
1.1
0.5
−
630
V
V
mA
mA
kHz
Symbol
V
IN
I
LEAK
Min
2.7
−
−
Typ
−
0.06
−
Max
5.4
0.3
10
Unit
V
mA
DV
out0
mV
DV
out0
mV
TON
MIN
R
DS(ON)_P
I
LIM
nsec
W
mA
ISTART
LIN
mA
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3
NCP1500
SHD
Reference
Out +
−
I
Limit
PWM
SYN
Sync
Detection
and
Timing
Block
Mode Select
+
Slope
Compression
−
SoftStart
−
−
+
Out
S
Q
R
LX
MBRM120
Thermal
Shutdown
Linear
Control
Block
V
O
+
−
L
Output
Voltage
C2
V
ref
+ 5%
V
CC
C1
Input
Voltage
PWM
Comparator
Out
CVP
Comparator
Out
+
−
Error
Amplifier
CB0
V
ref
CB1
Output
Voltage
Program
MUX
Ground
Component
C1, C2
L
Value
10
mF,
6.3 V
15
mH
Manufacturer
TDK, C3216X5R0J106M
TDK, RLF5018T−150MR76 (I
out
= 300 mA)
Coilcraft, D01606T−153 (I
out
= 300 mA)
TDK, NLC252018T−150 (I
out
= 100 mA)
Figure 2. Typical Circuit with the Internal Schematic
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4
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