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Features
* * * * * * * * * *
Dual Mode Low Drop Out Voltage Regulator 1.8V Fixed Output Voltage 3V to 5.5V Supply Operation 80 mA Maximum Load Current in Full Power Mode Maximum Current Consumption 36 A in Full Power Mode and 14 A in Low Power Mode Power-down Mode Consumption Less Than 1 A More Than 70dB (Typical) PSRR at 1 KHz 46 VRMS Output Noise 0.35 m CMOS Technology Typical Application: Baseband Memory Section Supply in Mobile Terminals
Description
RE029 is a dual mode Low Drop Out (LDO) voltage regulator macrocell with a fixed 1.8V output voltage, rated for loads up to 80 mA in full power mode and 5 mA in low power mode. (Both modes can be selected by the LP8 signal.) It is designed to be integrated with other analog cells, digital logic, microcontrollers, DSP cores and memory blocks into system-on-chip products. The circuit consists of a PMOS pass device, an error amplifier and a feedback resistive network, sized to achieve the required closed loop gain. These blocks make up the regulating loop. An over-current and short circuit protection circuit has been included to limit the output current delivered by the regulator, thus avoiding destruction in case of a short circuit. An external reference voltage VBG (bandgap voltage) is necessary for correct functionality. The target reference voltage is 1.231V delivered, for example, by BG019. Double pads on the supply voltage VBAT1B/VBAT1BB and output voltage VMLVA/VMLVAA are used to reduce the total output resistance. Current reference is generated inside the cell through a circuit supplied by a 2.5V 0.1V of regulated input voltage on V SAUVC. Remote sense terminal VMLVS provides regulation of the load by connecting it to the output terminal near a critical point to improve performance of the regulator (e.g., connecting it to the package pin by double-bonding, thus avoiding the bonding resistance influence). A ceramic capacitor of 2.2 F connected from VMLVA/VMLVAA to ground is needed as external compensation. Figure 1. Symbol (1)
Embedded ASIC Macrocell: Power Management for Mobile Terminals (PM) RE029 1.8V 80 mA Dual Mode LDO Regulator
Note:
1. Pin names are written as they appear on the user screen when the symbol is opened in the design tool environment.
Rev. 2705B-PMGMT-03/03
1
Functional Diagram
Figure 2. Functional Diagram
VBAT1B VBAT1BB VBAT1C
V BG ON8
ON8 LP8
ON8 LP8
V BG ON8
GND1
VMLVC VMLVA VMLVAA
GND1
ON8 LP8
Current Sensing and Limiting
VMLVS R1
GND1
V
SAUVC
R2 ON8 IBIAS ON8, LP8
GND1
GND1
Pin Description
Pin Name VBAT1B VBAT1BB VMLVA VMLVAA VMLVS VMLVC VBAT1C GND1 VSAUVC VBG ON8 LP8 I/O Power Supply Power Supply Analog Output Analog Output Analog Input Analog Output Auxiliary Power Supply Analog Ground Positive Power Supply Analog Input Digital Input Digital Input Type External Pad External Pad External Pad External Pad External Pad Internal Pin Internal Pin Internal Pin Internal Pin Internal Pin Internal Pin Internal Pin Function Power Supply Power Supply Output Voltage Output Voltage Sense Voltage Output Voltage Power Supply Ground Power Supply Voltage Reference Enable Command Low Power Mode Command Value 3V to 5.5V 3V to 5.5V 1.7V to 1.9V 1.7V to 1.9V 1.7V to 1.9V 1.7V to 1.9V 3V to 5.5V 0 2.5V 0.1V 1.231V 0V or VBAT1B/VBAT1BB 0V or VBAT1B/VBAT1BB
2
RE029 1.8V Dual Mode LDO Regulator
2705B-PMGMT-03/03
RE029 1.8V Dual Mode LDO Regulator
Absolute Maximum Ratings*
Analog Signals ....................................... -0.3V to 6.5V Digital Signals......................................... -0.3V to 5.5V Output Current...................................Internally limited Junction Temperature ..........................-20C to 150C
*NOTICE: Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Electrical Specifications(1)
TJ = -20C to 125C, VBAT1B/VBAT1BB = 3V to 5.5V unless otherwise specified, output capacitance = 2.2 F. Table 1. Electrical Characteristics
Symbol VBAT1B/VBAT1BB VSAUVC TJ Parameter Operating Supply Voltage Auxiliary Operating Supply Voltage Temperature Range Full Power Mode VMLVA/VMLVAA IMLVA/IMLVAA IQQ VDC VTRAN VDC VTRAN Output Voltage Output Current Quiescent Current Line Regulation Transient Line Regulation Load Regulation Transient Load Regulation IMLVA/IMLVAA = 80 mA IMLVA/IMLVAA = 80 mA rise time = fall time = 5 s 10% - 90% of max IMLVA/IMLVAA; 10% - 90% of max IMLVA/IMLVAA; rise time = fall time = 5 s @100 Hz VBAT1B/ VBAT1BB = 3V @1 kHz @20 kHz @100 kHz @100 Hz PSRR(2) Power Supply Rejection Ratio at Full Load VBAT1B/ VBAT1BB = 4.25V @1 kHz @20 kHz @100 kHz @100 Hz VBAT1B/ VBAT1BB = 5.5V @1 kHz @20 kHz @100 kHz VN Output Noise
(3)
Condition
Min 3 2.4 -20
Typ
Max 5.5
Unit V V C
2.5
2.6 125
1.72
1.87 80
V mA A mV mV mV mV dB dB dB dB dB dB dB dB dB dB dB dB
25
30 2 2 2 5 -75 -75 -55 -35 -70 -70 -60 -35 -65 -65 -55 -35 46
36 3 3 4.2 23
Bandwidth = 10 Hz to 100 kHz
80
VRMS
3
2705B-PMGMT-03/03
Table 1. Electrical Characteristics (Continued)
Symbol TR ISD ICC Parameter Rise Time Shut Down Current Short-circuit Current Threshold Low Power Mode VMLVA/VMLVAA IMLVA/IMLVAA IQQ VDC VTRAN VDC VTRAN Output Voltage Output Current Quiescent Current Line Regulation Transient Line Regulation Load Regulation Transient Load Regulation IMLVA/IMLVAA = 5 mA IMLVA/IMLVAA = 5 mA rise time = fall time = 5 s 10% - 90% of max IMLVA/IMLVAA 10% - 90% of max IMLVA/IMLVAA; rise time = fall time = 5 s @100 Hz VBAT1B/ VBAT1BB = 3V @1 kHz @20 kHz @100 kHz @100 Hz PSRR(2) Power Supply Rejection Ratio at Full Load VBAT1B/ VBAT1BB = 4.25V @1 kHz @20 kHz @100 kHz @100 Hz VBAT1B/ VBAT1BB = 5.5V @1 kHz @20 kHz @100 kHz VN TR ISD Notes: Output Noise Rise Time Shut Down Current
(3)
Condition Full Load 10% - 90% of VMLVA/VMLVAA
Min
Typ
Max 130 1 130
Unit s A mA
1.7
1.9 5
V mA A mV mV mV mV dB dB dB dB dB dB dB dB dB dB dB dB
9.75
11.5 2 2 2 5 -70 -70 -65 -35 -65 -65 -55 -35 -45 -45 -45 -40 90
13.75 3 3 5 8
Bandwidth = 10 Hz to 100 kHz Full Load 10% - 90% of VMLVA/VMLVAA
170 170 1
VRMS s A
1. Obtained by considering the parasitics of a TFBGA100 Package. 2. This parameter shows the immunization of the circuit taking into account a voltage ripple on battery voltage for different frequencies shown. 3. Obtained by using BG019 as reference voltage generator.
4
RE029 1.8V Dual Mode LDO Regulator
2705B-PMGMT-03/03
RE029 1.8V Dual Mode LDO Regulator
Control Modes
All digital signals are referred to the supply voltage VBAT1B, VBAT1BB. Table 2. Truth Table
ON8 0 1 1 LP8 X 0 1 VMLVA/VMLVAA Power down (High-Z) Power on, Full Power Mode VMLVA/VMLVAA = 1.8V Power on, Low Power Mode VMLVA/VMLVAA = 1.8V
Application Example
A ceramic capacitor (CL) of 2.2 F with ESR between 20 m and 250 m connected from VMLVA/VMLVAA to ground is needed for external compensation.
Description Capacitor (CL) Min 1.8 Typ 2.2 Max 2.6 Units F
Figure 3. Application Example
2.5V Regulator (e.g., RE031)
2.5V
VSAUVC
VBAT1B VBAT1BB
1.231V Bandgap (e.g., BG019)
VBG VMLVA VMLVAA VMLVS
Battery Pack
CL
Digital Core
ON8 LP8 VMLVC VBAT1C GND1
5
2705B-PMGMT-03/03
Typical Performance Characteristics (Conditions specified on page 10)
Note. In these graphs: - Output Voltage (VMLV) refers to VMLVA/VMLVAA - Battery Voltage (VBAT) refers to VBAT1B/VBAT1BB - Output Current (IMLV) refers to IMLVA/IMLVAA
Static Line Regulation at Full Load in Full Power Mode 0.8
O u tp u t V o lta g e C h a n g e [m V ]
S ta tic L o a d Re g u la tio n in F u ll P o w e r M o d e
2.5 2.0 1.5 1.0 0.5 0.0 -0.5 -1.0 -1.5 -2.0 V BA T = 4.25V V BA T = 3V V BA T = 5.5V
Output Voltage Change [mV]
0.6
0.4
0.2
0.0 3 3.5 4 4.5 5 5.5 Battery Voltage [V]
0
20
40
O u tp u t C u rre n t [m A ]
60
80
Transient Line Regulation at Full Load in Full Power Mode 2.500 2.000 Output Voltage Change [mV]
O u tp u t V o lta g e C h a n g e [V ]
T ra n sie n t L o a d R e g u la tio n in F u ll P o w e r M o d e
5.000 4.000 3.000 2.000 1.000 0.000 -1.000 -2.000 -3.000 -4.000 -5.000 V B AT = 5.5V V B AT = 3V V B AT = 4.25V
1.500 1.000 0.500 0.000 -0.500 -1.000 -1.500 -2.000 0.35
0.4
0.45 Time [ms]
0.5
0.55
0.35
0.4
0.45
T im e [m s]
0.5
0.55
6
RE029 1.8V Dual Mode LDO Regulator
2705B-PMGMT-03/03
RE029 1.8V Dual Mode LDO Regulator
Typical Performance Characteristics (Conditions specified on page 10)
P o w e r S u p p ly R e je ctio n Ra tio a t F u ll L o a d in F u ll P o w e r M o d e P o w e r S u p p ly Re je ctio n Ra tio a t F u ll L o a d V e rsu s Ba tte ry V o lta g e in F u ll P o w e r M o d e
10 -10 -20 -30 -40
P S RR [d B]
100
1000
10000
100000 -30
3.0
3.5
4.0
4.5
5.0
5.5
V BA T = 5.5V V BA T = 4.25V
P S RR [d B]
-40 -50 -60 -70 -80 -90 Freq = 1K Hz Freq = 20K Hz Freq = 100K Hz
-50 -60 -70 -80 -90 -100 -110
V BA T = 3V
-100 -110
F re q [Hz ]
Freq = 100Hz
Ba tte ry V o lta g e [V ]
L D O S ta rtu p a t F u ll L o a d fo r V B AT = 4 .25V in F u ll P o w e r M o d e
O u tp u t N o ise S p e ctru m a t F u ll L o a d a n d V B AT = 4.25V in F u ll P o w e r M o d e
5 4.5 4 3.5
V o lta g e [V ]
1.0E -11 O N8
O u tp u t N o ise [V /sq rt(H z )]
1.0E -12
Total output nois e 46 V R MS
3 2.5 2 1.5 1 0.5 0 0 50 100
T im e [ s]
1.0E -13
V MLV
1.0E -14
1.0E -15 150 200 10 100 1000
F re q [H z ]
10000
100000
7
2705B-PMGMT-03/03
Typical Performance Characteristics (Conditions specified on page 10)
Static Line Regulation at Full Load in Low Power Mode 5.0 4.5
O u tp u t V o lta g e C h a n g e [m V ] S ta tic L o a d Re g u la tio n in L o w P o w e r M o d e
6 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 V BA T = 3V V BA T = 4.25V V BA T = 5.5V
Output Voltage Change [mV]
4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 3 3.5 4 4.5 5 5.5 Battery Voltage [V]
0
1
2
3
4
5
O u tp u t C u rre n t [m A ]
Transient Line Regulation at Full Load in Low Power Mode 1.500 1.000 0.500 0.000 -0.500 -1.000 -1.500 0.35
O u t p u t V o lta g e C h a n g e [m V ]
Tr a n s ie n t Lo a d R e g u la tio n in Lo w P o w e r M o d e
V BAT = 5.5V
5 .5 0 0 4 .5 0 0 3 .5 0 0
V BAT = 4.25V
Output Voltage Change [mV]
2 .5 0 0 1 .5 0 0 0 .5 0 0 -0 .5 0 0
V BAT = 3V
0.4
0.45 Time [ms]
0.5
0.55
0 .3 5
0 .4
0 .4 5
Tim e [ m s ]
0 .5
0 .5 5
8
RE029 1.8V Dual Mode LDO Regulator
2705B-PMGMT-03/03
RE029 1.8V Dual Mode LDO Regulator
Typical Performance Characteristics (Conditions specified on page 10)
P o w e r S u p p ly R e je ctio n R a tio a t F u ll L o a d in L o w P o w e r M o d e P o w e r S u p p ly R e je ctio n R a tio a t F u ll L o a d V e rsu s B a tte ry V o lta g e in L o w P o w e r M o d e
10 -30 -40 -50
P S R R [d B ]
100
1000
10000
100000 -20
3.0
3.5
4.0
4.5
5.0
5.5
V B A T = 5.5V
V B A T = 4.25V
-30 -40
P S R R [d B ]
-50 -60 -70
-60 -70 -80 -90 -100
F re q [H z ]
F req = 1K Hz F req = 100K Hz F req = 20K Hz
-80 V B A T = 3V F req = 100Hz -90 -100
B a tte ry V o lta g e [V ]
L D O S ta rtu p a t F u ll L o a d fo r V B AT = 4 .25V in L o w P o w e r M o d e
O u tp u t N o ise S p e ctru m a t F u ll L o a d a n d V B AT = 4.25V in L o w P o w e r M o d e
5 4.5 4 3.5
V o lta g e [V ]
1.0E -10 O N8
O u tp u t N o ise [V /sq rt(H z )]
1.0E -11
Total output nois e 89 V R MS
3 2.5 2 1.5 1 0.5 0 0 25 50 75
T im e [ s]
V MLV
1.0E -12
1.0E -13
1.0E -14 100 125 150 10 100 1000
F re q [H z ]
10000
10000
9
2705B-PMGMT-03/03
Terminology
Line Regulation
Measures the maximum transient and DC variations of the output voltage of the RE029 when the supply changes between two specified values with fixed load current; minimum rise time and fall time is 5 s. Figure 4. Line Regulation
3.4V VBAT1B/VBAT1BB
3V 5 s
VMLVA/VMLVAA VTRAN
5 s
VDC
Load Regulation
Measures the maximum transient and DC variations of the output voltage of the RE029 when the load current changes between two specified values with fixed power supply; minimum rise time and fall time is 5 s. Figure 5. Load Regulation
90% of max IMLVA/IMLVAA IMLVA/IMLVAA 10% of max IMLVA/IMLVAA 5 s
5 s
VTRAN VMLVA/VMLVAA VDC
10
RE029 1.8V Dual Mode LDO Regulator
2705B-PMGMT-03/03
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2705B-PMGMT-03/03 0M

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