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Features
* * * * * * * * * *
Dual Mode Low Drop Out Voltage Regulator 2.8V Fixed Output Voltage 3V to 5.5V Supply Operation 160 mA Maximum Load Current in Full Power Mode Maximum Current Consumption 61 A in Full Power Mode and 12 A in Low Power Mode Power-down Mode Consumption Less Than 1 A More Than 70dB (Typical) PSRR at 1 KHz 70 VRMS Output Noise 0.35 m CMOS Technology Typical Application: Baseband Memory Section Supply in Mobile Terminals
Description
RE024 is a dual mode Low Drop Out (LDO) voltage regulator macrocell with a fixed 2.8V output voltage, rated for loads up to 160 mA in full power mode and 5 mA in low power mode. (Both modes can be selected by the LP2 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 VBAT2C/VBAT2CC and output voltage VMEMA/VMEMAA 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 VSAUVC. Remote sense terminal VMEMS 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 VMEMA/VMEMAA to ground is needed as external compensation. A low-leakage current switch has been added to charge a second external capacitor (2.2 F - 10 F) to VMEMA/VMEMAA. This voltage, called VBACKUP, is used to guarantee 30 minutes of operation time for the internal system clock and calendar in backup mode when the main battery is unplugged. Figure 1. Symbol (1) 2703A
VSAUVC VBG VBAT2C VBAT2CC VMEMA
ON2 LP2 BACKUPON
Embedded ASIC Macrocell: Power Management for Mobile Terminals (PM) RE024 2.8V 160 mA Dual Mode LDO Regulator
VMEMAA VMEMS VBACKUP
VMEMC
GND2
VBACKUPC
Note:
1. Pin names are written as they appear on the user screen when the symbol is opened in the design tool environment.
Rev. 2703A-PMGMT-02/02
1
Functional Diagram
Figure 2. Functional Diagram
V BAT2C V BAT2CC
V BG ON2
ON2 LP2
ON2 LP2
V BG ON2
GND2
VMEMC VMEMA BACKUPON VMEMAA VBACKUP
GND2
ON2 LP2
Current Sensing and Limiting
VBACKUPC VMEMS
GND2
R11
R12
V
SAUVC
R21 ON2 IBIAS
R22
ON2, LP2
GND2
GND2
Pin Description
Pin Name VBAT2C VBAT2CC VMEMA VMEMAA VMEMS VMEMC VBACKUP VBACKUPC GND2 VSAUVC VBG ON2 LP2 BACKUPON I/O Power Supply Power Supply Analog Output Analog Output Analog Input Analog Output Analog Input Analog Output Analog Ground Positive Power Supply Analog Input Digital Input Digital Input Digital Input Type External Pad External Pad External Pad External Pad External Pad Internal Pin 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 Backup Voltage Internal Backup Voltage Ground Power Supply Voltage Reference Enable Command Low Power Mode Command Backup Mode Command Value 3V to 5.5V 3V to 5.5V 2.75V to 2.9 2.75V to 2.9V 2.75V to 2.9V 2.75V to 2.9V 2.75V to 2.9V 2.75V to 2.9V 0 2.5V 0.1V 1.231V 0V or VBAT2C/VBAT2CC 0V or VBAT2C/VBAT2CC 0V or VBAT2C/VBAT2CC
2
RE024 2.8V Dual Mode LDO Regulator
2703A-PMGMT-02/02
RE024 2.8V 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, VBAT2C/VBAT3CC = 3V to 5.5V unless otherwise specified, output capacitance = 2.2 F. Table 1. Electrical Characteristics
Symbol VBAT2C/VBAT2CC VSAUVC Parameter Operating Supply Voltage Auxiliary Operating Supply Voltage Temperature Range Full Power Mode VMEMA/VMEMAA IMEMA/IMEMAA IQQ VDC VTRAN Output Voltage Output Current Quiescent Current Line Regulation Transient Line Regulation VBAT2C/VBAT2CC = 3.4V to 3.V; IMEMA/IMEMAA = 160 mA VBAT2C/VBAT2CC = 3.4V to 3V; IMEMA/IMEMAA = 160 mA rise time = fall time = 5 s 10% - 90% of max IMEMA/IMEMAA; 10% - 90% of max IMEMA/IMEMAA; rise time = fall time = 5 s @100 Hz VBAT2C/ VBAT2CC = 3V @1 kHz @20 kHz @100 kHz @100 Hz PSRR (2) Power Supply Rejection Ratio at Full Load VBAT2C/ VBAT2CC = 4.25V @1 kHz @20 kHz @100 kHz @100 Hz VBAT2C/ VBAT2CC = 5.5V @1 kHz @20 kHz @100 kHz -34 -34 -32 -23 -76 -73 -50 -34 -77 -73 -49 -33 43 51 3.9 17.6 2.75 2.85 160 61 6.3 32.5 V mA A mV mV Condition Min 3 2.4 -20 2.5 Typ Max 5.5 2.6 125 Unit V V C
TJ
VDC VTRAN
Load Regulation Transient Load Regulation
4.2 25
9.4 65.3 -23 -23 -20 -10 -65 -64 -44 -28 -59 -59 -44 -28
mV mV dB dB dB dB dB dB dB dB dB dB dB dB
3
2703A-PMGMT-02/02
Table 1. Electrical Characteristics (Continued)
Symbol VN TR ISD ICC Parameter Output Noise Rise Time Shut Down Current Short-circuit Current Threshold Low Power Mode VMEMA/VMEMAA IMEMA/IMEMAA IQQ VDC VTRAN Output Voltage Output Current Quiescent Current Line Regulation Transient Line Regulation VBAT2C/VBAT2CC = 3.4V to 3.V; IMEMA/IMEMAA = 2 mA VBAT2C/VBAT2CC = 3.4V to 3V; IMEMA/IMEMAA = 2 mA rise time = fall time = 5 s 10% - 90% of max IMEMA/IMEMAA; 10% - 90% of max IMEMA/IMEMAA; rise time = fall time = 5 s @100 Hz VBAT2C/ VBAT2CC = 3V @1 kHz @20 kHz @100 kHz @100 Hz PSRR(2) Power Supply Rejection Ratio at Full Load VBAT2C/ VBAT2CC = 4.25V @1 kHz @20 kHz @100 kHz @100 Hz VBAT2C/ VBAT2CC = 5.5V @1 kHz @20 kHz @100 kHz VN TR ISD ICC Notes: Output Noise Rise Time Shut Down Current Short-circuit Current Threshold
(3) (3)
Condition Bandwidth = 10 Hz to 100 kHz; Full Load 10% - 90% of VMEMA/VMEMAA
Min
Typ 70
Max 118 200 1 450
Unit VRMS s A mA
2.72
2.9 5
V mA A mV mV
9
10.5 1.1 1.4
12 1.61 4
VDC VTRAN
Load Regulation Transient Load Regulation
2 1.3 -45 -45 -45 -38 -85 -75 -49 -32 -63 -63 -50 -37 204
4.96 5.45 -34 -38 -29 -33 -55 -55 -46 -30 -46 -46 -43 -34 300 500 1 240
mV mV dB dB dB dB dB dB dB dB dB dB dB dB VRMS s A mA
Bandwidth = 10 Hz to 100 kHz; Full Load 10% - 90% of VMEMA/VMEMAA
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
RE024 2.8V Dual Mode LDO Regulator
2703A-PMGMT-02/02
RE024 2.8V Dual Mode LDO Regulator
Control Modes
All digital signals are referred to the supply voltage VBAT. Table 2. Truth Table
ON2 0 1 1 LP2 X 0 1 VMEMA/VMEMAA Power down (High-Z) Power on, Full Power Mode VMEMA/VMEMAA = 2.8V Power on, Low Power Mode VMEMA/VMEMAA = 2.8V
Table 3. Backupon Truth Table
BACKUPON 0 1 VBACKUP Backup Mode Backup Switch Closed VBACKUP = VMEMA/VMEMAA
Application Example
A ceramic capacitor of 2.2 F with ESR between 20 m and 250 m connected from VMEMA/VMEMAA to ground is needed for external compensation. A ceramic capacitor with a value between 2.2 F and 10F connected between VBACKUP and Ground is used as backup supply.
Description Capacitor (CL) Backup Battery (CBCK) Min 1.8 2.2 Typ 2.2 Max 2.6 10 Units F F
Figure 3. Application Example
2.5V Regulator (e.g., RE031)
2.5V
VSAUVC
VBAT2C VBAT2CC
1.231V Bandgap (e.g., BG019)
VBG VMEMA VMEMAA VMEMS
Battery Pack
CL
Digital Core
ON6 LP2 BACKUPON VMEMC GND2
VBACKUP VBACKUPC
CBCK
5
2703A-PMGMT-02/02
Typical Performance Characteristics (Conditions specified on page 10)
Note. In these graphs: - - - Output Voltage refers to VMEMA/VMEMAA Battery Voltage refers to VBAT2C/VBAT2CC Output Current refers to IMEMA/IMEMAA
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
Static Line Regulation at Full Load in Full Pow er Mode
2
Output Voltage Change [mV]
O u tp u t V o lta g e C h a n g e [m V ]
5 4 3 2 1 0 3 3.5 4 4.5 5 5.5
0 -2
V B A T = 3V
V B A T = 5.5V -4 -6 -8 -10 -12 -14 0 20 40 60 80 100 120 140 160 V B A T = 4,25V
Battery Voltage [V]
O u tp u t Cu rre n t [m A]
:
Transient Line Regulation at Full Load in Full Power Mode 2.800 2.795 Output Voltage [V] 2.790 2.785 2.780 2.775
2.775
O u tp u t V o lta 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
2.805 V B A T = 3V 2.800 2.795 2.790 2.785 2.780 V B A T = 5,5V V B A T = 4,25V
2.770 0.35
0.4
0.45 Time [ms]
0.5
0.55
2.770 0.35 0.4 0.45
T im e [m s]
0.5
0.55
6
RE024 2.8V Dual Mode LDO Regulator
2703A-PMGMT-02/02
RE024 2.8V Dual Mode LDO Regulator
Typical Performance Characteristics (Conditions specified on page 10)
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 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
100
1000
10000
100000
3 .0 3.5 4 .0 4 .5 5 .0 5 .5
-10
-20 -30
P S R R [d B]
-20 -30 -40
P S RR [d B]
Freq = 20K Hz
Freq = 100K Hz
-40 -50 -60 -70 -80 V BA
T
V BA = 3V
T
= 4,25V
V BAT = 5,5V
-50 -60 -70 -80 -90 -100 Freq = 100Hz F req = 1K Hz
F re q u e n cy [Hz ]
Ba tte ry V o lta g e [V ]
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 N2
O u tp u t No ise [V ^ 2/Hz ]
Total output nois e 70 V R MS 1.0E -12
3 2.5 2 1.5 1 0.5 0 0 20 40
T im e [s]
V ME M
1.0E -13
1.0E -14
60 80 100
10
100
1000
F re q u e n cy [Hz ]
10000
100000
7
2703A-PMGMT-02/02
Typical Performance Characteristics (Conditions specified on page 10
Static Line Regulation at Full Load in Low Power Mode 1.5
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 R e g u la tio n in L o w P o w e r M o d e
6 5
Output Voltage Change [mV]
1.0 0.5 0.0 -0.5 -1.0 -1.5 3 3.5 4 4.5 5 5.5 Battery Voltage [V]
4 3 2 1 0 -1 -2 -3 -4 -5 0 1 V B AT = 3V
V B A T = 5,5V
V B A T = 4 ,25V
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
2 .8 02
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
2.800
2 .8 01
O u t p u t V o lta g e [V]
V B A T = 4,25V
V B A T = 5,5V
2.799 Output Voltage [V]
2 .8 00 2 .7 99 2 .7 98 2 .7 97 2 .7 96 2 .7 95
2.798
2.797
V B A T = 3V
2.796
2.795 0.35
0.4
0.45 Time [ms]
0.5
0.55
0 .3 5
0 .4
0 .45
Tim e [m s ]
0 .5
0 .5 5
8
RE024 2.8V Dual Mode LDO Regulator
2703A-PMGMT-02/02
RE024 2.8V Dual Mode LDO Regulator
Typical Performance Characteristics (Conditions specified on page 10)
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 in L o w P o w e r M o d e
P ow e r S up ply Re je ctio n Ra tio a t Fu ll L oa d V e rsu s Ba tte ry V olta ge in Lo w P o w e r M o de
10 -30
100
1000
10000
100000
-20 -30
3.0
3.5
4.0
4.5
5.0
5.5
-40
P S R R [d B]
P S RR [d B]
-40
V B A T = 4,25V -50 V B A T = 3V
-50 -60 -70 -80 Freq = 100 K Hz Freq = 20 K Hz Freq = 1 K Hz Freq = 100 Hz
-60 V B A T = 5,5V -70
F re q u e n cy [Hz ]
-90 -100
Ba tte ry V o lta ge [V ]
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 No 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 -09 O N2
O u tp u t No ise [V ^ 2/H z ]
1.0E -10
Total O utput Nois e 204V R MS
3 2.5 2 1.5 1 0.5 0 0 25 50 75 T im e [s] 100 125
V ME M
1.0E -11
1.0E -12
1.0E -13 150 10 100 1000
F re q u e n cy [Hz ]
10000
100000
9
2703A-PMGMT-02/02
Terminology
Line Regulation Measures the maximum transient and DC variations of the output voltage of the RE024 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 VBAT2C/VBAT2CC
3V 5 s
VMEMA/VMEMAA VTRAN
5 s
VDC
Load Regulation
Measures the maximum transient and DC variations of the output voltage of the RE024 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 IMEMA/IMEMAA IMEMA/IMEMAA 10% of max IMEMA/IMEMAA
5 s
5 s
VMEMA/VMEMAA
VTRAN
VDC
10
RE024 2.8V Dual Mode LDO Regulator
2703A-PMGMT-02/02
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2703A-PMGMT-02/02 0M

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