ON Semiconductor CS5253B-1 Technical data

CS3844

CS5253B-1

3.0 A LDO 5-Pin Adjustable Linear Regulator with Remote Sense Applications

This new very low dropout linear regulator reduces total power dissipation in the application. To achieve very low dropout, the internal pass transistor is powered separately from the control circuitry. Furthermore, with the control and power inputs tied together, this device can be used in single supply configuration and still offer a better dropout voltage than conventional PNP − NPN based LDO regulators. In this mode the dropout is determined by the minimum control voltage.

The CS5253B−1 is offered in a five−terminal D 2PAK−5 package, which allows for the implementation of a remote−sense pin permitting very accurate regulation of output voltage directly at the load, where it counts, rather than at the regulator. This remote sensing feature virtually eliminates output voltage variations due to load changes and resistive voltage drops. Typical load regulation measured at the sense pin is less than 1.0 mV for an output voltage of 2.5 V with a load step of 10 mA to 3.0 A.

The CS5253B−1 has a very fast transient loop response which can be adjusted using a small capacitor on the Adjust pin.

Internal protection circuitry provides for ªbust−proofº operation, similar to three−terminal regulators. This circuitry, which includes overcurrent, short circuit, and overtemperature protection will self protect the regulator under all fault conditions.

The CS5253B−1 is ideal for generating a 2.5 V supply to power graphics controllers used on VGA cards. Its remote sense and low value capacitance requirements make this a low cost, high performance solution. The CS5253B−1 is optimized from the CS5253−1 to allow a lower value of output capacitor to be used at the expense of a slower transient response.

Features

•Pb−Free Package is Available*

•VOUT Range is 1.25 V to 5.0 V @ 3.0 A

•VPOWER Dropout < 0.40 V @ 3.0 A

•VCONTROL Dropout < 1.05 V @ 3.0 A

•1.0% Trimmed Reference

•Fast Transient Response

•Remote Voltage Sensing

•Thermal Shutdown

•Current Limit

•Short Circuit Protection

•Drop−In Replacement for EZ1582

•Backwards Compatible with 3−Pin Regulators

•Very Low Dropout Reduces Total Power Consumption

*For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques

Reference Manual, SOLDERRM/D.

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1	Tab = VOUT
	Pin 1. VSENSE
5	2.	Adjust
D2PAK−5	3.	VOUT
DP SUFFIX	4.	VCONTROL
CASE 936AC	5.	VPOWER

MARKING DIAGRAM
		CS
		5253B−1
	AWLYWW
	1
A	= Assembly Location
WL	= Wafer Lot
Y	= Year
WW	= Work Week
ORDERING INFORMATION
Device		Package	Shipping²
CS5253B−1GDP5		D 2PAK−5	50 Units/Rail
CS5253B−1GDPR5		D 2PAK−5	750 Tape & Reel
CS5253B−1GDPR5G		D 2PAK−5	750 Tape & Reel
		(Pb−Free)

²For 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, 2004	1	Publication Order Number:
June, 2004 − Rev. 5		CS5253B−1/D

		CS5253B−1
5.0 V	VCONTROL	VOUT		RDIS
				2.5 V @ 3.0 A
	CS5253B−1
3.3 V	VPOWER	VSENSE
			124	33 F
				5.0 V
		Adjust
				CLOAD
	100 F		124	(Optional)
10 F
	5.0 V
10 V

GND	GND
	RDIS
Figure 1. Application Diagram
MAXIMUM RATINGS
Rating		Value	Unit
VPOWER Input Voltage		6.0	V
VCONTROL Input Voltage		13	V
Operating Junction Temperature Range, TJ		0 to 150	°C
Storage Temperature Range		−65 to +150	°C
ESD Damage Threshold		2.0	kV
Lead Temperature Soldering:	Reflow: (SMD styles only) (Note 1)	230 peak	°C

Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied, damage may occur and reliability may be affected.

1. 60 second maximum above 183°C.

ELECTRICAL CHARACTERISTICS (0°C ≤ TA ≤ 70°C; 0°C ≤ TJ ≤ 150°C; VSENSE = VOUT and VADJ = 0 V; unless otherwise specified)

Characteristic	Test Conditions	Min	Typ	Max	Unit
Reference Voltage	VCONTROL = 2.75 V to 12 V, VPOWER = 2.05 V to 5.5 V,	1.237	1.250	1.263	V
	IOUT = 10 mA to 3.0 A	(−1.0%)		(+1.0%)
Line Regulation	VCONTROL = 2.5 V to 12 V, VPOWER = 1.75 V to 5.5 V,	−	0.02	0.2	%
	IOUT = 10 mA
Load Regulation	VCONTROL = 2.75 V, VPOWER = 2.05 V,	−	0.04	0.3	%
	IOUT = 10 mA to 3.0 A, with Remote Sense
Minimum Load Current (Note 2)	VCONTROL = 5.0 V, VPOWER = 3.3 V, VOUT = +1.0%	−	5.0	10	mA
Control Pin Current (Note 3)	VCONTROL = 2.75 V, VPOWER = 2.05 V, IOUT = 100 mA	−	6.0	10	mA
	VCONTROL = 2.75 V, VPOWER = 2.05 V, IOUT = 3.0 A	−	35	120	mA
Adjust Pin Current	VCONTROL = 2.75 V, VPOWER = 2.05 V, IOUT = 10 mA	−	60	120	A
Current Limit	VCONTROL = 2.75 V, VPOWER = 2.05 V, VOUT = −4.0%	3.1	4.0	−	A
Short Circuit Current	VCONTROL = 2.75 V, VPOWER = 2.05 V, VOUT = 0 V	2.0	3.5	−	A
Ripple Rejection (Note 4)	VCONTROL = VPOWER = 3.25 V, VRIPPLE = 1.0 VP−P @	60	80	−	dB
	120 Hz, IOUT = 3.0 A, CADJ = 0.1 F
Thermal Regulation	30 ms Pulse, TA = 25°C	−	0.002	−	%/W

2.The minimum load current is the minimum current required to maintain regulation. Normally the current in the resistor divider used to set the output voltage is selected to meet the minimum load current requirement.

3.The VCONTROL pin current is the drive current required for the output transistor. This current will track output current with roughly a 1:100 ratio. The minimum value is equal to the quiescent current of the device.

4.This parameter is guaranteed by design and is not 100% production tested.

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CS5253B−1

ELECTRICAL CHARACTERISTICS (continued) (0°C ≤ TA ≤ 70°C; 0°C ≤ TJ ≤ 150°C; VSENSE = VOUT and VADJ = 0 V; unless otherwise specified.)

Characteristic	Test Conditions	Min	Typ	Max	Unit
VCONTROL Dropout Voltage	VPOWER = 2.05 V, IOUT = 100 mA	−	0.90	1.15	V
(Minimum VCONTROL − V OUT)	VPOWER = 2.05 V, IOUT = 1.0 A	−	1.00	1.15	V
(Note 5)	VPOWER = 2.05 V, IOUT = 3.0 A	−	1.05	1.30	V
VPOWER Dropout Voltage	VCONTROL = 2.75 V, IOUT = 100 mA	−	0.05	0.15	V
(Minimum VPOWER − V OUT)	VCONTROL = 2.75 V, IOUT = 1.0 A	−	0.15	0.25	V
(Note 5)	VCONTROL = 2.75 V, IOUT = 3.0 A	−	0.40	0.60	V
RMS Output Noise	Freq = 10 Hz to 10 kHz, TA = 25°C	−	0.003	−	%VOUT
Temperature Stability	−	0.5	−	−	%
Thermal Shutdown (Note 6)	−	150	180	210	°C
Thermal Shutdown Hysteresis	−	−	25	−	°C
VCONTROL Supply Only Output	VCONTROL = 13 V, VPOWER Not Connected,	−	−	50	mA
Current	VADJ = VOUT = VSENSE = 0 V
VPOWER Supply Only Output	VPOWER = 6.0 V, VCONTROL Not Connected,	−	0.1	1.0	mA
Current	VADJ = VOUT = VSENSE = 0 V

5.Dropout is defined as either the minimum control voltage (VCONTROL) or minimum power voltage (VPOWER) to output voltage differential required to maintain 1.0% regulation at a particular load current.

6.This parameter is guaranteed by design, but not parametrically tested in production. However, a 100% thermal shutdown functional test is performed on each part.

PACKAGE PIN DESCRIPTION

Package	Pin
Pin #	Symbol	Function
1	VSENSE	This Kelvin sense pin allows for remote sensing of the output voltage at the load for improved regulation. It is
		internally connected to the positive input of the voltage sensing error amplifier.
2	Adjust	This pin is connected to the low side of the internally trimmed 1.0% bandgap reference voltage and carries a bias
		current of about 50 A. A resistor divider from Adjust to VOUT and from Adjust to ground sets the output voltage.
		Also, transient response can be improved by adding a small bypass capacitor from this pin to ground.
3	VOUT	This pin is connected to the emitter of the power pass transistor and provides a regulated voltage capable of
		sourcing 3.0 A of current.
4	VCONTRO	This is the supply voltage for the regulator control circuitry. For the device to regulate, this voltage should be be-
	L	tween 0.9 V and 1.3 V (depending on the output current) greater than the output voltage. The control pin current
		will be about 1.0% of the output current.
5	VPOWER	This is the power input voltage. This pin is physically connected to the collector of the power pass transistor. For
		the device to regulate, this voltage should be between 0.1 V and 0.6 V greater than the output voltage depending
		on the output current. The output load current of 3.0 A is supplied through this pin.

VPOWER

VCONTROL
BIAS	VREF	−	EA	IA	+
and
		+			−
TSD
					VOUT
					VSENSE
					Adjust

Figure 2. Block Diagram

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