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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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* 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 the Rohm BD3501FVM and BD3502FVM These are Pb-Free Devices
8 Micro8 DM SUFFIX CASE 846A STYLE 2 XXXX A Y W G XXXX AYW G G 1
1
= 3520 for Fixed 1.2 V or = 3521 for Fixed 1.5 V = Assembly Location = Year = Work Week = Pb-Free Package
Typical Applications
* Computer based gaming consoles
NCP3520 NCP3521 EN NRCS 0.01 mF NTMS4107N or equivalent VD VD 10 mF
(Note: Microdot may be in either location)
PIN CONNECTIONS
NRCS GND EN VCC 1 2 3 4 Micro8 (Top View) 3.0 A VO 8 7 6 5 VD G VS VFB
VCC 5.0 A 1.0 mF GND
G VS VFB
220 mF
ORDERING INFORMATION
See detailed ordering and shipping information in the package dimensions section on page 9 of this data sheet.
NOTE:
For best performance VFB should utilize a Kelvin connection at the load.
Figure 1. Application Diagram
(c) Semiconductor Components Industries, LLC, 2007
March, 2007 - Rev. 0
1
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 VREF
20mA
Non Rush Current on Startup (NRCS) with 50 ms Startup Short Detect
- +
Short Circuit Protection
VFB
+ -
35% of VOUT
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.
otherwise specified)
ELECTRICAL CHARACTERISTICS (TJ = 25C, VCC = 5 V, VD = 2.0 V, EN = 3 V, External FET = NTMS4107N (Note 3), unless
Characteristic REGULATOR OUTPUT Feedback Voltage (NCP3520) IO (NTMS4107N) = 50 mA 4.5 V < VCC < 5.5 V, 0C < TJ < 100C (Note 1) IO (NTMS4107N) = 50 mA 4.5 V < VCC < 5.5V, 0C < TJ < 100C (Note 1) EN = 0 V EN = 3 V EN = 3 V 4.5 V < VCC < 5.5 V, IOUT = 0 4.5 V < VCC < 5.5 V, IOUT = 3 A (Note 1) 4.5 V < VCC < 5.5 V, IOUT = 0 4.5 V < VCC < 5.5 V, IOUT = 3 A (Note 1) IO = 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
otherwise specified)
ELECTRICAL CHARACTERISTICS (TJ = 25C, VCC = 5 V, VD = 2.0 V, EN = 3 V, External FET = NTMS4107N (Note 3), unless
Characteristic OUTPUT DRIVER Source Current Sink Current GENERAL VFB Input Impedance NCP3520 (1.2 V) NCP3521 (1.5 V) VS Input Bias Current VS Standby Current VCC Undervoltage Lockout VCC Undervoltage Lockout Hysteresis VD Undervoltage Lockout (NCP3520) VD Undervoltage Lockout (NCP3521) VD 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 VCC 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 VFB Decreasing NRCS = 0.5 V NRCS = 0.5 V NRCS = 0.5 V 14 14 300 1.15 VFB * 0.30 - - - - 20 20 400 1.3 26 26 - 1.4 mA mA mA V V mS mS mS mV VS = 1 V, EN = 0 V VCC Rising - - - 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 - kW VFB = VOUT - 0.1 V, VGATE = 2.5 V VFB = VOUT + 0.1 V, VGATE = 2.5 V -4 2 -3 3 -2 4 mA mA Conditions Min Typ Max Unit
mA mA V mV V V kW
C C
VFB * 0.35 VFB * 0.40 50 50 50 25 - - - 50
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
1.204 1.2035 1.203 1.2025 1.202 VO VO IOUT = 50 mA 25 60 85 1.2015 1.201 1.2005 1.2 1.1995 1.199 -10 1.507 1.506 1.505 1.504 1.503 1.502 1.501 1.5 1.499 1.498 -10 25 60 TEMPERATURE (C) IOUT = 50 mA 95
TEMPERATURE (C)
Figure 3. 1.2 V Output Voltage versus Temperature (NCP3520)
1.400 1.200 VOUT, 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 VIN, INPUT VOLTAGE (V) mA 1.08 1.07 1.06 1.05 1.11 1.1 1.09
Figure 4. 1.5 V Output Voltage versus Temperature (NCP3521)
-10
25
60
95
TEMPERATURE (C)
Figure 5. Output Voltage versus Input Voltage (NCP3520)
1.400 ICC, INPUT CURRENT (mA) ICC, 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 = 0C
1.05
T = 25C
T = 100C
0.000 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50 5.00 VIN, INPUT VOLTAGE (V)
1.0
0
1000 ILOAD, (mA)
2000
30
Figure 7. ICC versus Input Voltage (NCP3520)
Figure 8. ICC versus ILOAD (05C, 255C, 1005C)
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NCP3520/NCP3521
600 70.00 60.00 MAG (dB) 50.00 40.00 30.00 20.00 10.00 0.00 10 100 1k 10 k 100 k 100 0 8.0 9.0 10 11 12 13 14 15 16 17 18 19 20 NRCS CAPACITOR (nF) RISETIME (s) 400 300 200 500
Figure 9. Ripple Rejection versus Frequency (VCC = 5.0 V, ILOAD = 3.0 A)
Figure 10. NRCS Time versus NRCS Capacitor (NCP3520)
Control Signal
Control Signal
VO
VO
Figure 11. Load Transient Response (10 mA to 1.3 A) Channel 1 (VO), Channel 2 (Switch Control)
Figure 12. Load Transient Response (1.3 A to 10 mA) Channel 1 (VO), Channel 2 (Switch Control)
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NCP3520/NCP3521
DETAILED OPERATING DESCRIPTION
General
The NCP3520/NCP3521 are LDO Regulator Controllers. An external NFET device sets the current capability allowing for designer selection. Features include an undervoltage lockout for both the integrated circuit supply Pin VCC, and the supply pin for the external FET connection to the drain of the FET. The NRCS (Non Rush Current on Startup) feature prevents high currents through the external FET (drain-source). The external capacitor setting component used in NRCS is also used for short circuit protection (SCP). The device also has an enable feature allowing it to go into a low supply current sleep mode demanded by most modern day feature rich systems when not in use. Thermal shutdown functionality protects the IC from damage caused from excessively high temperatures appearing on the IC.
Output Driver
3. Device startup into a short circuit. Further details are available on this subject under the heading "Starting Up Into A Short Circuit".
Normal Powerup/Down
Output current drive capability is determined by the designer's choice of external MOSFET (NFET). Power dissipated in the driver can be controlled by the voltage applied to VD. VD should be kept low to minimize power dissipation and high enough to support regulated operation at the desired output current. It should also be noted the output capacitor (VO to GND) value supports regulation during high speed transient events until the system loop can respond to any voltage dips to drive the external FET.
High Speed Control
The NRCS (Non Rush Current on Startup) timer controls the output driver during powerup. The output driver voltage (VG) is controlled during powerup. The voltage on NRCS is mimicked to provide a duplicate voltage on VFB. When 1.2 V is reached normal operation of the error amplifier and feedback network take over. Regulation is maintained in the loop around 1.2 V. The NRCS pin rises up to 1 V. At 1 V, the NRCS capacitor is discharged fully at a 300 mA (min) rate. The IC enters a standby mode capable of short circuit detection. A 20 mA pullup current source is used to charge the external NRCS capacitor linearly and maintain a predictable powerup. A recommended 0.01 mF will provide a 325 ms powerup time. Alternative times can be programmed with this equation:
T + C(NRCS) * V FB INRCS
(eq. 1)
Rush current during startup can be calculated by I = COUT * VO / T. The NRCS circuit is not active during powerdown. Normal circuit operation will be maintained unless VCC_UVLO or VD_UVLO cause the gate drive output to turn off.
3V EN 1.2 V
Unlike most linear regulators whose reaction to overvoltage events is to turn off the upper driver and let the external load and resistor feedback network quench the incident, the NCP3520/21 include a 1.2 mA pulldown through the VS Pin. This keeps overshoot to a minimum during powerup. During turn-off and thermal overload, the pulldown current is increased from 1.2 mA to 220 mA to provide an even faster turn-off time.
Power On Reset
VS / VFB
A 50 ms power on reset circuit is built into the IC acting as a digital filter and performing housekeeping activity during a short circuit event. The timer effects three areas of operation. 1. EN turn on delay. Upon detection of an EN high, there is a 50 ms delay to when the internal circuitry turns on and the gate pin (G) goes high. A low on EN resets the timer. 2. VCC startup delay. If VCC drops out below the undervoltage lockout voltage and restored above its hysteresis value, a 50 ms time is also observed from reinitiation of VCC and G going high. This is recognized to be different from the EN turn on delay by the active circuitry of the voltage reference, NRCS circuitry, and VS high current pulldown.
1.0 V 0.65 V
NRCS 50 ms
Error amplifier takes control here.
A standby mode for short circuit is entered here.
Figure 13. Powerup (NCP3520 (1.2 V) Version Shown)
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NCP3520/NCP3521
Short Circuit Protection (SCP)
3V EN 1.2 V VS / VFB
The IC enters normal mode after the NRCS has gone through powerup. The NRCS capacitor has reached a 1 V (typ) threshold and fully discharged (50 mV (max)). When a short circuit event occurs it is detected when the voltage on VFB goes below (35% of VOUT). This triggers the NRCS current source to start charging the NRCS capacitor at the same 20 mA rate as during powerup. When the voltage on the capacitor reaches 1.3 V a short circuit event is confirmed, VG goes low turning off the external FET. VS Standby Current pulldown is enabled.
Clearing a Short Circuit Latch Condition
1.3 V 1.0 V
A short circuit latch condition can be cleared by toggling the EN from its high condition to a low condition, and then back to a high condition.
3V EN 0V 1.2 V VS / VFB VO * 0.35 Shirt Circuit is Detected
NRCS
50 ms
Figure 15. Starting Up Into a Short Circuit (NCP3520 (1.2 V) Version Shown) Undervoltage Lockout
50 ms Shirt Circuit Decision Timer
1.3 V
VCC and VD detection is provided in conjunction with the EN input pin. When all three conditions are met (VCC is up, VD is up, and EN is high), the Non Rush Current on Startup (NRCS) circuitry is allowed to start. Any one of the three conditions failing will not allow the device to turn on. The VCC undervoltage threshold is 4.35 V and the VD threshold is VO * 0.7.
Enable
NRCS
Output Falls Out of Regulation
Output Turns Off
Figure 14. Short Circuit (NCP3520 (1.2 V) Version Shown) Starting Up Into a Short Circuit
The Enable function is controlled by the logic pin EN. The threshold of this pin is set to TTL logic levels. TTL logic levels are 0.8 V (low) and 2.0 V (high). A low on the EN pin puts the device is a low current sleep mode consuming less than 10 mA (IVCC). A device going from normal operation to sleep will 1st go through a discharge mode maintaining a discharge current of 220 mA on VS (measured @ VS = 1 V). This pin has 60 mV (typ) of hysteresis to guarantee a clean switching threshold.
External Components
If the NCP3520/NCP3521 turns on and has not gone into a normal mode of operation, additional time has been added to the NRCS to ignore potential false short circuit confirmation during in-rush current events. This time is independent of the external capacitor value and is typically 50 ms. The voltage on NRCS operates as a normal condition until it reaches 1 V. The current source charging NRCS turns off for 50 ms disallowing the voltage to rise on NRCS. After 50 ms the current source turns back on and continues to charge the NRCS capacitor. Once 1.3 V is reached, the circuit operates as during a typical short circuit event.
A capacitor between VO and ground is required for stability. A 220 mF value capacitor such as the SANYO 2R5TPE220MF is recommended. The SANYO 2R5TPE220MF capacitor has a 15 mW maximum specification. Contact resistance and board trace resistance are the significant contributors to output capacitor ESR below 10 mW. As ON Semiconductor's NCP352X family of LDO controllers may be considered as an alternative to Rohm's family of LDO controllers, alternative FETs such as industry compatible parts like the Si4866DY may also be used in conjunction with ON Semiconductor's controller.
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NCP3520/NCP3521
Thermal Shutdown
When the die temperature exceeds the Thermal Shutdown threshold, a Thermal Shutdown (TSD) event is detected and VG is turned off. The IC will remain in this state until the die
ORDERING INFORMATION
Device NCP3520DMR2G NCP3521DMR2G Package
temperature moves below the shutdown threshold (180C typical) minus the hysteresis factor (15C typical). The output will then go through a soft startup using the NRCS circuitry.
Shipping 4000 / Tape & Reel 4000 / Tape & Reel
Micro8 (Pb-Free) Micro8 (Pb-Free)
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.
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NCP3520/NCP3521
PACKAGE DIMENSIONS
Micro8t CASE 846A-02 ISSUE G
D
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSION A DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.15 (0.006) PER SIDE. 4. DIMENSION B DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION. INTERLEAD FLASH OR PROTRUSION SHALL NOT EXCEED 0.25 (0.010) PER SIDE. 5. 846A-01 OBSOLETE, NEW STANDARD 846A-02. DIM A A1 b c D E e L HE STYLE 2: PIN 1. 2. 3. 4. 5. 6. 7. 8. MILLIMETERS NOM MAX -- 1.10 0.08 0.15 0.33 0.40 0.18 0.23 3.00 3.10 3.00 3.10 0.65 BSC 0.40 0.55 0.70 4.75 4.90 5.05 MIN -- 0.05 0.25 0.13 2.90 2.90 SOURCE 1 GATE 1 SOURCE 2 GATE 2 DRAIN 2 DRAIN 2 DRAIN 1 DRAIN 1 INCHES NOM -- 0.003 0.013 0.007 0.118 0.118 0.026 BSC 0.016 0.021 0.187 0.193 MIN -- 0.002 0.010 0.005 0.114 0.114 MAX 0.043 0.006 0.016 0.009 0.122 0.122 0.028 0.199
HE
E
PIN 1 ID
e
b 8 PL 0.08 (0.003)
M
TB
S
A
S
-T- PLANE 0.038 (0.0015) A1
SEATING
A c L
SOLDERING FOOTPRINT*
8X
1.04 0.041
0.38 0.015
8X
3.20 0.126
4.24 0.167
5.28 0.208
6X
0.65 0.0256
SCALE 8:1
mm inches
*For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D.
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: orderlit@onsemi.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81-3-5773-3850 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative
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NCP3520/D

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