NCP3520/NCP3521
LDO Regulator Controller
The NCP3520 / NCP3521 parts are Low Drop Out (LDO) regulator
controllers for applications requiring high-currents and ultra low
dropout voltages. The use of an external NMOS driver allows the user
to adapt the device to a multitude of applications depending on system
requirements for current and dropout voltage.
Features
♦
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MARKING
DIAGRAM
8
Micro8
DM SUFFIX
CASE 846A
STYLE 2
XXXX
AYW
G
G
1
•
Fixed Voltage Options
•
•
•
•
•
•
•
•
•
•
•
•
NCP3520 (1.2 V)
♦
NCP3521 (1.5 V)
Low Operating Current
Low Standby Current (sleep mode < 1
mA)
Non Rush Current on Startup
Short Circuit Protection
1% Output Voltage Tolerance
Drop-In Replacement for Rohm BD3520FVM and BD3521FVM
Functionally Equivalent to Rohm BD3501FVM and BD3502FVM
These are Pb-Free Devices
Consumer: Set-Top Boxes, Gaming Consoles
LCD Televisions
FPGA
Networking Equipment
NRCS
NCP3520
NCP3521
EN
NRCS
0.01
mF
NTMS4107N
or equivalent
3.0 A
220
mF
V
O
VD
V
D
10
mF
GND
EN
VCC
1
XXXX
A
Y
W
G
= 3520 for Fixed 1.2 V or
= 3521 for Fixed 1.5 V
= Assembly Location
= Year
= Work Week
= Pb-Free Package
Typical Applications
(Note: Microdot may be in either location)
PIN CONNECTIONS
1
2
3
4
Micro8
(Top View)
8
7
6
5
VD
G
VS
VFB
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 9 of this data sheet.
VCC
5.0 V
1.0
mF
GND
G
VS
VFB
NOTE:
For best performance V
FB
should
utilize a Kelvin connection at the load.
Figure 1. Application Diagram
©
Semiconductor Components Industries, LLC, 2007
1
May, 2007 - Rev. 2
Publication Order Number:
NCP3520/D
NCP3520/NCP3521
VCC
VCC_UVLO
50ms
Timer
Voltage
Reference
VD_UVLO
EN
+
-
50ms
Timer
-
+
+
-
VD
0.65V
Latch
Clear
Latch
Set
Output
Off
Latch
Thermal
Shutdown
+
+
-
G
1.2mA
VS
220mA
GND
V
REF
20mA
Non Rush
Current on
Startup
(NRCS)
with 50
ms
Startup
Short
Detect
-
+
Short Circuit
Protection
VFB
+
-
35% of V
OUT
NRCS
Figure 2. Block Diagram
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NCP3520/NCP3521
PACKAGE PIN DESCRIPTION Micro8
Pin #
1
2
3
4
5
6
7
8
Symbol
NRCS
GND
EN
VCC
VFB
VS
G
VD
Description
Non Rush current on Startup. Capacitor to ground controls output voltage slew rate and short circuit
delay time.
Ground.
Enable input control.
Power Supply Voltage Input.
Voltage Feedback pin into the error amplifier for maintaining the output voltage.
Source input. Provides pulldown capability (1.2 mA operating & 220 mA turnoff) for fast output voltage
response time.
Gate Drive for the external NFET.
NFET Drain input for voltage sensing.
MAXIMUM RATINGS
Rating
All Pins
IG (DC)
IG (AC)
IVS (DC)
Electrostatic Discharge, Human Body Model
Electrostatic Discharge, Machine Model
Package Thermal Resistance
Micro8
Operating Junction Temperature
Storage Temperature Range
Value
-0.3 to 7
10
10
300
1.5
100
238
-10 to 150
-55 to 150
Unit
V
mA
kV
V
°C/W
°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.
ELECTRICAL CHARACTERISTICS
(T
J
= 25°C, V
CC
= 5 V, V
D
= 2.0 V, EN = 3 V, External FET = NTMS4107N (Note 3), unless
otherwise specified)
Characteristic
REGULATOR OUTPUT
Feedback Voltage (NCP3520)
I
O
(NTMS4107N) = 50 mA
4.5 V < V
CC
< 5.5 V, 0°C < T
J
< 100°C
(Note 1)
I
O
(NTMS4107N) = 50 mA
4.5 V < V
CC
< 5.5V, 0°C < T
J
< 100°C
(Note 1)
EN = 0 V
EN = 3 V
EN = 3 V
4.5 V < V
CC
< 5.5 V, I
OUT
= 0
4.5 V < V
CC
< 5.5 V, I
OUT
= 3 A (Note 1)
4.5 V < V
CC
< 5.5 V, I
OUT
= 0
4.5 V < V
CC
< 5.5 V, I
OUT
= 3 A (Note 1)
I
O
= 0 A to 3 A
1.188
1.176
1.485
1.470
1.200
1.200
1.500
1.500
1.212
1.224
1.515
1.530
V
V
V
V
Conditions
Min
Typ
Max
Unit
Feedback Voltage (NCP3521)
Supply Current
Sleep Mode
Run Mode
Short Circuit Latch Condition
Line Regulation (NCP3520)
Line Regulation (NCP3521)
Load Regulation (Note 2)
-
-
-
-
-
-
0
1.25
0.5
1.2
1.2
1.5
1.5
0.50
10
1.7
1.7
6.0
6.0
7.5
7.5
10
mA
mA
mA
mV
mV
mV
mV
mV
1. Guaranteed by Design
2. Load regulation may vary with the selection of an external FET other than the NTMS4107N.
3. See “External Components” section on Page 8.
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NCP3520/NCP3521
ELECTRICAL CHARACTERISTICS
(T
J
= 25°C, V
CC
= 5 V, V
D
= 2.0 V, EN = 3 V, External FET = NTMS4107N (Note 3), unless
otherwise specified)
Characteristic
OUTPUT DRIVER
Source Current
Sink Current
GENERAL
V
FB
Input Impedance
NCP3520 (1.2 V)
NCP3521 (1.5 V)
V
S
Input Bias Current
V
S
Standby Current
V
CC
Undervoltage Lockout
V
CC
Undervoltage Lockout Hysteresis
V
D
Undervoltage Lockout (NCP3520)
V
D
Undervoltage Lockout (NCP3521)
V
D
Input Impedance
NCP3520 (1.2 V)
NCP3521 (1.5 V)
Thermal Shutdown (Note 1)
Thermal Hysteresis (Note 1)
NON RUSH CURRENT ON STARTUP (NRCS) SHORT CIRCUIT PROTECTION (SCP)
NRCS Charge Current
SCP Charge Current
SCP Discharge Current
SCP Threshold Voltage
Short Detect Voltage
Power On Reset V
CC
EN to G Turn on Delay
Short Circuit Powerup Decision Timer
NRCS Standby Voltage
ENABLE
Input Threshold
Low
High
Input Hysteresis
Input Current
EN = 3 V
-
2.0
-
-
1.34
1.40
60
7
0.8
-
-
10
V
V
mV
mA
V
FB
Decreasing
NRCS = 0.5 V
NRCS = 0.5 V
NRCS = 0.5 V
14
14
300
1.15
V
FB
* 0.30
-
-
-
-
20
20
400
1.3
V
FB
* 0.35
50
50
50
25
26
26
-
1.4
V
FB
* 0.40
-
-
-
50
mA
mA
mA
V
V
mS
mS
mS
mV
V
S
= 1 V, EN = 0 V
V
CC
Rising
kW
-
-
-
150
4.20
100
0.72
0.90
-
-
150
-
21
26
1.2
220
4.35
160
0.84
1.05
228
284
180
15
-
-
2.4
-
4.50
250
0.96
1.20
-
-
210
-
°C
°C
mA
mA
V
mV
V
V
kW
V
FB
= V
OUT
- 0.1 V, V
GATE
= 2.5 V
V
FB
= V
OUT
+ 0.1 V, V
GATE
= 2.5 V
-4
2
-3
3
-2
4
mA
mA
Conditions
Min
Typ
Max
Unit
1. Guaranteed by Design
2. Load regulation may vary with the selection of an external FET other than the NTMS4107N.
3. See “External Components” section on Page 8.
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4
NCP3520/NCP3521
1.204
1.2035
1.203
1.2025
1.202
V
O
1.2015
1.201
1.2005
1.2
1.1995
1.199
-10
25
60
I
OUT
= 50 mA
85
V
O
1.507
1.506
1.505
1.504
1.503
1.502
1.501
1.5
1.499
1.498
-10
25
60
95
TEMPERATURE (°C)
TEMPERATURE (°C)
I
OUT
= 50 mA
Figure 3. 1.2 V Output Voltage versus
Temperature (NCP3520)
1.400
1.200
V
OUT
, OUTPUT VOLTAGE (V)
1.000
0.800
0.600
0.400
0.200
0.000
0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50 5.00
V
IN
, INPUT VOLTAGE (V)
mA
1.08
1.07
1.06
1.05
-10
1.11
1.1
1.09
Figure 4. 1.5 V Output Voltage versus
Temperature (NCP3521)
25
60
95
TEMPERATURE (°C)
Figure 5. Output Voltage versus Input Voltage
(NCP3520)
1.400
I
CC
, INPUT CURRENT (mA)
I
CC
, INPUT CURRENT (mA)
1.200
1.000
0.800
0.600
0.400
0.200
1.10
Figure 6. Run Mode Supply Current versus
Temperature
T = 0°C
T = 25°C
1.05
T = 100°C
0.000
0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50 5.00
V
IN
, INPUT VOLTAGE (V)
1.0
0
1000
I
LOAD
, (mA)
2000
30
Figure 7. I
CC
versus Input Voltage (NCP3520)
Figure 8. I
CC
versus I
LOAD
(05C, 255C, 1005C)
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