NCP1595, NCP1595A,
NCP1595C
1 MHz, 1.5 A Synchronous
Buck Regulator
The NCP1595/A/C family are fixed 1 MHz, high−output−current,
synchronous PWM converters that integrate a low−resistance,
high−side P−channel MOSFET and a low−side N−channel MOSFET.
The NCP1595/A/C utilizes current mode control to provide fast
transient response and excellent loop stability. It regulates input
voltages from 4.0 V to 5.5 V down to an output voltage as low as 0.8 V
and is able to supply up to 1.5 A.
The NCP1595/A/C includes an internally fixed switching frequency
(F
SW
), and an internal soft−start to limit inrush currents. Using the EN
pin, shutdown supply current is reduced to 3
mA
maximum.
Other features include cycle−by−cycle current limiting,
short−circuit protection and thermal shutdown.
Features
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MARKING
DIAGRAM
1
DFN6
CASE 506AH
XXXXX
ALYWG
G
•
Input Voltage Range: from 4.0 V to 5.5 V
•
Internal 140 mW High−Side Switching P−Channel MOSFET and
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
90
mW
Low−Side N−Channel MOSFET
Fixed 1 MHz Switching Frequency
Cycle−by−Cycle Current Limiting
Overtemperature Protection
Internal Soft−Start
Diode Emulation During Light Load (Disabled for NCP1595C)
Hiccup Mode Short−Circuit Protection
Start−up with Pre−Biased Output Load
Adjustable Output Voltage Down to 0.8 V
These are Pb−Free Devices
DSP Power
Hard Disk Drivers
Computer Peripherals
Home Audio
Set−Top Boxes
Networking Equipment
LCD TV
Wireless and DSL/Cable Modem
USB Power Devices
XXXXX = N1595, 1595A, 1595C
A
= Assembly Location
L
= Wafer Lot
Y
= Year
W
= Work Week
G
= Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
FB 1
GND 2
LX 3
6 NC
5 VCC
4 VCCP
NCP1595/NCP1595C
FB 1
GND 2
LX 3
NCP1595A
6 EN
5 VCC
4 VCCP
Applications
ORDERING INFORMATION
Device
NCP1595MNR2G
NCP1595MNT2G
NCP1595AMNR2G
NCP1595AMNTWG
NCP1595CMNTWG
†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.
DFN6
3000 / Tape & Reel
(Pb−Free)
Package
Shipping
†
©
Semiconductor Components Industries, LLC, 2014
March, 2014
−
Rev. 11
1
Publication Order Number:
NCP1595/D
NCP1595, NCP1595A, NCP1595C
BLOCK DIAGRAM
NCP1595/A/C
VCCP
VCC
Power Reset
UVLO
THD
Hiccup
+
CA
−
NC/EN
+
OSC
Soft−Start
PMOS
M1
Vref
FB
+
+ gm
−
−
PWM
+
Control
Logic
LX
GND
Figure 1. Block Diagram
PIN DESCRIPTIONS
Pin No
1
2
3
4
5
6
Symbol
FB
GND
LX
V
CCP
V
CC
NC
EN
Description
Feedback input pin of the Error Amplifier. Connect a resistor divider from the converter’s output
voltage to this pin to set the converter’s output voltage.
Ground pin. Connect to thermal pad.
The drains of the internal MOSFETs. The output inductor should be connected to this pin.
Power input for the power stage
Input supply pin for internal bias circuitry. A 0.1
mF
ceramic bypass capacitor is preferred to connect
to this pin.
No connection for NCP1595 or NCP1595C
Logic input to enable the part. Logic high to turn on the part and logic low to shut off the part.
An internal pullup forces the part into an enable state when no external bias is present on the pin.
For NCP1595A only
Exposed pad of the package provides both electrical contact to the ground and good thermal contact
to the PCB. This pad must be soldered to the PCB for proper operation.
EP
PAD
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2
NCP1595, NCP1595A, NCP1595C
APPLICATION CIRCUIT
V
in
4.0 V
−
5.5 V
VCCP
VCC
NC/EN
LX
GND
FB
V
out
Figure 2. NCP1595/A/C
ABSOLUTE MAXIMUM RATINGS
Rating
Power Supply Pin (Pin 4, 5) to GND
Symbol
V
in
Value
6.5
−0.3
(DC)
−1.0
(t < 100 ns)
V
in
+ 0.7
V
in
+ 1.0 (t < 20 ns)
−0.7
(DC)
−5.0
(t < 100 ns)
6.0
−0.3
(DC)
−1.0
(t < 100 ns)
T
A
T
J
T
S
R
qJA
−40
to +125
−40
to +150
−55
to +150
68.5
Unit
V
LX to GND
LX
V
All other pins
V
Operating Temperature Range
Junction Temperature
Storage Temperature Range
Thermal Resistance Junction−to−Air (Note 1)
°C
°C
°C
°C/W
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
1. R
qJA
measured on approximately 1x1 inch sq. of 1 oz. Copper.
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3
NCP1595, NCP1595A, NCP1595C
(V
in
= 4.0 V
−
5.5 V, V
out
= 1.2 V, T
J
= +25°C for typical value; For NCP1595, NCP1595A:
−40°C
< T
A
< 125°C; For NCP1595C:
−40°C
< T
A
< 85°C for min/max values unless noted otherwise)
Parameter
V
in
Input Voltage Range (Note 2)
V
CC
UVLO Threshold
UVLO Hysteresis
V
CC
Quiescent Current
V
CCP
Quiescent Current
V
in
Shutdown Supply Current (Note 3)
FEEDBACK VOLTAGE
Reference Voltage
Feedback Input Bias Current (Note 2)
Feedback Voltage Line Regulation (Note 3)
PWM
Maximum Controllable Duty Cycle (regulating)
Minimum Controllable ON Time (Note 3)
PULSE−BY−PULSE CURRENT LIMIT
Pulse−by−Pulse Current Limit (Regulation)
Pulse−by−Pulse Current Limit (Soft−Start)
OSCILLATOR
Oscillator Frequency
MOSFET
High Side MOSFET ON Resistance (Note 2)
High Side MOSFET Leakage (Note 3)
Low Side MOSFET ON Resistance (Note 2)
Low Side MOSFET Leakage (Note 3)
ENABLE (NCP1595A)
EN HI Threshold
EN LO Threshold
EN Hysteresis
EN Pullup Current
SOFT−START
Soft−Start Ramp Time (Note 3)
Hiccup Timer (Note 3)
THERMAL SHUTDOWN
Thermal Shutdown Threshold (Note 3)
Thermal Shutdown Hysteresis (Note 3)
2. Guaranteed by characterization. Not production tested.
3. Guaranteed by design. Not production tested.
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
185
40
°C
°C
t
SS
F
SW
= 1 MHz
1.0
2.0
ms
ms
ENHI
ENLO
(NCP1595A)
(NCP1595A)
(NCP1595A)
(NCP1595A)
200
1.4
3.0
1.4
0.4
V
V
mV
mA
R
DS(on)
HS
R
DS(on)
LS
I
DS
= 100 mA, V
GS
= 5 V
V
EN
= 0 V, V
SW
= 0 V
I
DS
= 100 mA, V
GS
= 5 V
V
EN
= 0 V, V
SW
= 5 V
90
140
200
10
125
10
mW
mA
mW
mA
F
SW
0.87
1.0
1.13
MHz
I
LIM
I
LIMSS
2.7
4.0
3.9
5.3
4.3
6.1
A
A
82
85
50
%
ns
V
FB
I
FB
V
FB
= 0.8 V
V
in
= 4.0 V to 5.5 V
0.788
0.800
10
0.06
0.812
100
V
nA
%/V
I
inVCC
I
inVCCP
I
QSHDN
V
in
= 5 V,V
FB
= 1.5 V,
(No Switching)
V
in
= 5 V,V
FB
= 1.5 V,
(No Switching)
(NCP1595A), EN = 0 V
Symbol
V
in
Test Conditions
Min
4.0
3.2
3.5
335
1.7
25
1.8
3.0
2.0
Typ
Max
5.5
3.8
Unit
V
V
mV
mA
mA
mA
ELECTRICAL CHARACTERISTICS
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4
NCP1595, NCP1595A, NCP1595C
TYPICAL OPERATING CHARACTERISTICS
3.7
3.6
3.5
UVLO (V)
3.4
3.3
3.2
3.1
−40 −25 −10
UVLO Falling Threshold
UVLO Rising Threshold
V
FB
, FB INPUT THRESHOLD (mV)
95 110 125
815
810
805
800
795
790
785
−40 −25 −10
5
20
35
50
65
80
5
20
35
50
65
80
95 110 125
T
A
, AMBIENT TEMPERATURE (°C)
T
A
, AMBIENT TEMPERATURE (°C)
Figure 3. Undervoltage Lockout vs.
Temperature
1.3
f
SW
, SWITCH FREQUENCY (MHz)
1.2
1.1
1.0
0.9
0.8
0.7
−40 −25 −10
I
LIM
(A)
4.5
4.0
3.5
5.5
5.0
Figure 4. Feedback Input Threshold vs.
Temperature
I
LIM
(Soft−Start)
I
LIM
(Regulation)
5
20
35
50
65
80
95
110 125
3.0
−40 −25 −10
5
20
35
50
65
80
95 110 125
T
A
, AMBIENT TEMPERATURE (°C)
T
A
, AMBIENT TEMPERATURE (°C)
Figure 5. Switching Frequency vs.
Temperature
2.0
1.8
I
CC
, SWITCHING (mA)
I
CC
, DISABLED (mA)
1.6
1.4
1.2
1.0
−40 −25 −10
2.0
1.8
1.6
1.4
1.2
Figure 6. Current Limit vs. Temperature
5
20
35
50
65
80
95 110 125
1.0
−40 −25 −10
5
20
35
50
65
80
95 110 125
T
A
, AMBIENT TEMPERATURE (°C)
T
A
, AMBIENT TEMPERATURE (°C)
Figure 7. Quiescent Current Into V
CC
vs.
Temperature
Figure 8. Quiescent Current Into V
CC
vs.
Temperature
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