ETC RE024

Features
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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 µA in Full Power Mode and 12 µA in Low Power Mode
Power-down Mode Consumption Less Than 1 µA
More Than 70dB (Typical) PSRR at 1 KHz
70 µVRMS Output Noise
0.35 µm 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 V SAUVC.
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 µF connected from VMEMA/VMEMAA to ground is
needed as external compensation.
Embedded ASIC
Macrocell:
Power
Management for
Mobile
Terminals (PM)
RE024 2.8V
160 mA
Dual Mode LDO
Regulator
A low-leakage current switch has been added to charge a second external capacitor
(2.2 µF - 10 µF) 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)
VBAT2C
VSAUVC
VBG
VBAT2CC
VMEMA
ON2
LP2
BACKUPON
VMEMAA
VMEMS
VBACKUP
VMEMC
Note:
GND2
VBACKUPC
1. Pin names are written as they appear on the user screen when the symbol is
opened in the design tool environment.
Rev. 2703B-PMGMT–02/03
1
Functional Diagram
Figure 2. Functional Diagram
V BAT2C
V BAT2CC
ON2
LP2
V BG
ON2
LP2
ON2
V BG
ON2
GND2
VMEMC
GND2
VMEMA
VMEMAA
BACKUPON
VBACKUP
ON2
LP2
Current Sensing
and Limiting
VBACKUPC
VMEMS
GND2
R11
R12
R21
R22
V
SAUVC
ON2
IBIAS
ON2, LP2
GND2
GND2
Pin Description
Pin Name
I/O
Type
Function
Value
VBAT2C
Power Supply
External Pad
Power Supply
3V to 5.5V
VBAT2CC
Power Supply
External Pad
Power Supply
3V to 5.5V
VMEMA
Analog Output
External Pad
Output Voltage
2.75V to 2.9
VMEMAA
Analog Output
External Pad
Output Voltage
2.75V to 2.9V
VMEMS
Analog Input
External Pad
Sense Voltage
2.75V to 2.9V
VMEMC
Analog Output
Internal Pin
Output Voltage
2.75V to 2.9V
VBACKUP
Analog Input
External Pad
Backup Voltage
2.75V to 2.9V
VBACKUPC
Analog Output
Internal Pin
Internal Backup Voltage
2.75V to 2.9V
GND2
Analog Ground
Internal Pin
Ground
0
VSAUVC
Positive Power Supply
Internal Pin
Power Supply
2.5V ± 0.1V
VBG
Analog Input
Internal Pin
Voltage Reference
1.231V
ON2
Digital Input
Internal Pin
Enable Command
0V or VBAT2C/VBAT2CC
LP2
Digital Input
Internal Pin
Low Power Mode Command
0V or VBAT2C/VBAT2CC
BACKUPON
Digital Input
Internal Pin
Backup Mode Command
0V or VBAT2C/VBAT2CC
2
RE024 2.8V 160 mA Dual Mode LDO Regulator
2703B–PMGMT–02/03
RE024 2.8V 160 mA Dual Mode LDO Regulator
Absolute Maximum Ratings*
Analog Signals ....................................... -0.3V to 6.5V
*NOTICE:
Digital Signals......................................... -0.3V to 5.5V
Output Current...................................Internally limited
Junction Temperature ..........................-20°C to 150°C
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 = -20°C to 125°C, VBAT2C/VBAT3CC = 3V to 5.5V unless otherwise specified, output capacitance = 2.2 µF.
Table 1. Electrical Characteristics
Symbol
Parameter
Condition
Min
VBAT2C/VBAT2CC
Operating Supply Voltage
3
VSAUVC
Auxiliary Operating Supply
Voltage
2.4
TJ
Temperature Range
Typ
Max
Unit
5.5
V
2.6
V
-20
125
°C
2.75
2.85
V
160
mA
51
61
µA
2.5
Full Power Mode
VMEMA/VMEMAA
Output Voltage
IMEMA/IMEMAA
Output Current
IQQ
Quiescent Current
∆VDC
Line Regulation
IMEMA/IMEMAA = 160 mA
4
7
mV
∆VTRAN
Transient Line Regulation
IMEMA/IMEMAA = 160 mA
rise time = fall time = 5 µs
18
33
mV
∆VDC
Load Regulation
10% - 90% of max IMEMA/IMEMAA
3
10
mV
∆VTRAN
Transient Load Regulation
10% - 90% of max IMEMA/IMEMAA
rise time = fall time = 5 µs
25
66
mV
43
VBAT2C/
VBAT2CC = 3V
PSRR (2)
Power Supply Rejection Ratio
at Full Load
VBAT2C/
VBAT2CC =
4.25V
VBAT2C/
VBAT2CC = 5.5V
VN
Output Noise(3)
@100 Hz
-30
dB
@1 kHz
-30
dB
@20 kHz
-27
dB
@100 kHz
-20
dB
@100 Hz
-70
dB
@1 kHz
-70
dB
@20 kHz
-47
dB
@100 kHz
-32
dB
@100 Hz
-70
dB
@1 kHz
-65
dB
@20 kHz
-47
dB
@100 kHz
-30
dB
Bandwidth = 10 Hz to 100 kHz
70
118
µVRMS
3
2703B–PMGMT–02/03
Table 1. Electrical Characteristics (Continued)
Symbol
Parameter
Condition
Min
TR
Rise Time
Full Load 10% - 90% of VMEMA/VMEMAA
ISD
Shut Down Current
ICC
Short-circuit Current Threshold
Typ
Max
Unit
200
µs
1
µA
450
mA
2.9
V
5
mA
10.5
12
µA
Low Power Mode
VMEMA/VMEMAA
Output Voltage
2.72
IMEMA/IMEMAA
Output Current
IQQ
Quiescent Current
∆VDC
Line Regulation
VBAT2C/VBAT2CC = 3.4V to 3.V
IMEMA/IMEMAA = 2 mA
2
3
mV
∆VTRAN
Transient Line Regulation
VBAT2C/VBAT2CC = 3.4V to 3V
IMEMA/IMEMAA = 2 mA
rise time = fall time = 5 µs
2
4
mV
∆VDC
Load Regulation
10% - 90% of max IMEMA/IMEMAA
2
5
mV
∆VTRAN
Transient Load Regulation
10% - 90% of max IMEMA/IMEMAA
rise time = fall time = 5 µs
2
6
mV
9
VBAT2C/
VBAT2CC = 3V
PSRR(2)
Power Supply Rejection Ratio
at Full Load
VBAT2C/
VBAT2CC =
4.25V
VBAT2C/
VBAT2CC = 5.5V
@100 Hz
-40
dB
@1 kHz
-40
dB
@20 kHz
-35
dB
@100 kHz
-35
dB
@100 Hz
-70
dB
@1 kHz
-65
dB
@20 kHz
-47
dB
@100 kHz
-30
dB
@100 Hz
-55
dB
@1 kHz
-55
dB
@20 kHz
-46
dB
@100 kHz
-35
dB
VN
Output Noise(3)
Bandwidth = 10 Hz to 100 kHz
TR
Rise Time
Full Load 10% - 90% of VMEMA/VMEMAA
ISD
Shut Down Current
ICC
Notes:
4
204
Short-circuit Current Threshold
300
µ VRMS
500
µs
1
µA
240
mA
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.
RE024 2.8V 160 mA Dual Mode LDO Regulator
2703B–PMGMT–02/03
RE024 2.8V 160 mA Dual Mode LDO Regulator
Control Modes
All digital signals are referred to the supply voltage VBAT.
Table 2. Truth Table
ON2
LP2
VMEMA/VMEMAA
0
X
Power down (High-Z)
1
0
Power on, Full Power Mode VMEMA/VMEMAA = 2.8V
1
1
Power on, Low Power Mode VMEMA/VMEMAA = 2.8V
Table 3. Backupon Truth Table
Application
Example
BACKUPON
VBACKUP
0
Backup Mode
1
Backup Switch Closed VBACKUP = VMEMA/VMEMAA
A ceramic capacitor of 2.2 µF with ESR between 20 mΩ and 250 mΩ connected from
VMEMA/VMEMAA to ground is needed for external compensation.
A ceramic capacitor with a value between 2.2 µF and 10µF connected between VBACKUP and
Ground is used as backup supply.
Description
Min
Typ
Max
Units
Capacitor (CL)
1.8
2.2
2.6
µF
Backup Battery (CBCK)
2.2
10
µF
Figure 3. Application Example
2.5V Regulator
(e.g., RE031)
2.5V
VSAUVC
VBAT2C
VBAT2CC
1.231V Bandgap
(e.g., BG019)
VBG
Battery
Pack
VMEMA
VMEMAA
Digital
Core
VMEMS
ON6
LP2
BACKUPON
CL
VBACKUP
VMEMC
GND2
VBACKUPC
CBCK
5
2703B–PMGMT–02/03
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 R e 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 Power Mode
2
O u tp u t V o lta g e C h a n g e [m V ]
Output Voltage Change [mV]
5
4
3
2
1
0
V B A T = 3V
0
-2
V B A T = 5.5V
-4
-6
-8
-10
V B A T = 4,25V
-12
-14
3
3.5
4
4.5
5
5.5
0
20
40
60
80
100
120
140
160
O u tp u t C u rre n t [m A ]
Battery Voltage [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
Transient Line Regulation at Full Load in Full Power Mode
2.800
2.805
2.795
2.800
O u tp u t V o lta g e [V ]
Output Voltage [V]
V B A T = 3V
2.790
2.785
2.780
2.795
2.790
2.780
2.775
2.775
2.770
0.35
0.4
0.45
Time [ms]
0.5
0.55
V B A T = 4,25V
2.785
V B A T = 5,5V
2.770
0.35
0.4
0.45
0.5
0.55
T im e [m s]
6
RE024 2.8V 160 mA Dual Mode LDO Regulator
2703B–PMGMT–02/03
RE024 2.8V 160 mA 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
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
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
100
1000
10000
100000
-10
-20
-20
-30
-30
Freq = 20K Hz
Freq = 100K Hz
-40
-40
-50
V BA
V BA
T
T
= 4,25V
P S R R [d B]
P S R R [d B ]
-10
V B A T = 5,5V
= 3V
-60
-50
-60
-70
-80
-70
-90
-80
Freq = 100Hz
F re q u e n cy [H z ]
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
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
in F u ll P o w e r M o d e
1.0E -11
5
O N2
4.5
O u tp u t N o ise [V ^ 2/H z ]
4
3.5
V o lta g e [V ]
Freq = 1K Hz
-100
V ME M
3
2.5
2
1.5
1
Total output nois e 70 µV R MS
1.0E -12
1.0E -13
0.5
1.0E -14
0
0
20
40
60
T im e [µs]
80
100
10
100
1000
10000
100000
F re q u e n cy [H z ]
7
2703B–PMGMT–02/03
Typical Performance Characteristics (Conditions specified on page 10)
Static Line Regulation at Full Load in Low Power Mode
S ta tic L o a d Re g ula tio n in Lo w P o w e r M o d e
6
1.5
O u tp ut V o lta g e Ch a n g e [m V ]
Output Voltage Change [mV]
5
1.0
0.5
0.0
-0.5
-1.0
4
V B A T = 5,5V
3
2
1
V B A T = 4 ,25V
0
-1
-2
-3
V B A T = 3V
-4
-1.5
3
3.5
4
4.5
5
5.5
-5
0
1
2
Battery Voltage [V]
3
4
5
O u tp ut Cu rre n t [m A]
Tr a n s ie n t Lo a d R e g u la tio n in Lo w Po w e r M o d e
Transient Line Regulation at Full Load
in Low Power Mode
2.8 02
2.800
V B A T = 5,5V
2.8 01
O u tp u t Vo lta g e [V]
Output Voltage [V]
2.799
2.798
2.797
2.796
V B A T = 4,25V
2.7 99
2.7 98
2.7 97
V B A T = 3V
2.7 96
2.795
0.35
2.7 95
0.4
0.45
Time [ms]
8
2.8 00
0.5
0.55
0.3 5
0.4
0.4 5
0.5
0.5 5
Tim e [ m s ]
RE024 2.8V 160 mA Dual Mode LDO Regulator
2703B–PMGMT–02/03
RE024 2.8V 160 mA Dual Mode LDO Regulator
Typical Performance Characteristics (Conditions specified on page 10)
P o w e r S u p p l y R e j e ctio n Ra tio a t F u ll L o a d
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
in Low P ow e r M ode
B a tte ry V o lta g e in L o w P o w e r M o d e
10
100
1000
10000
100000
3.0
-30
3.5
4.0
4.5
5.0
5.5
-20
-30
-40
V B A T = 4,25V
-50
P S R R [d B ]
P S R R [d B]
-40
V B A T = 3V
-60
-50
-60
Freq = 100 K Hz
-70
Freq = 20 K Hz
-80
V B A T = 5,5V
Freq = 1 K Hz
-90
-70
Freq = 100 Hz
-100
F re q u e n c y [H z ]
B a 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
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
in L o w P o w e r M o d e
5
1.0E -09
O N2
4.5
O u tp u t N o ise [V ^ 2/H z ]
4
V o lta g e [V ]
3.5
V ME M
3
2.5
2
1.5
1
Total O utput Nois e 204µV R MS
1.0E -10
1.0E -11
1.0E -12
0.5
1.0E -13
0
0
25
50
75
T im e [µs]
100
125
150
10
100
1000
10000
100000
F re q u e n cy [H z ]
9
2703B–PMGMT–02/03
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 µs.
Figure 4. Line Regulation
3.4V
VBAT2C/VBAT2CC
3V
5 µs
5 µs
VMEMA/VMEMAA
∆VTRAN
∆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 µs.
Figure 5. Load Regulation
90% of max IMEMA/IMEMAA
IMEMA/IMEMAA
10% of max IMEMA/IMEMAA
VMEMA/VMEMAA
10
∆VTRAN
5 µs
5 µs
∆VDC
RE024 2.8V 160 mA Dual Mode LDO Regulator
2703B–PMGMT–02/03
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Printed on recycled paper.
2703B–PMGMT–02/03
0M