ETC RE029

Features
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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 µA in Full Power Mode and 14 µA in Low Power Mode
Power-down Mode Consumption Less Than 1 µA
More Than 70dB (Typical) PSRR at 1 KHz
46 µVRMS Output Noise
0.35 µm 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 µF connected from VMLVA/VMLVAA to ground is
needed as external compensation.
Embedded ASIC
Macrocell:
Power
Management for
Mobile
Terminals (PM)
RE029
1.8V 80 mA
Dual Mode LDO
Regulator
Figure 1. Symbol (1)
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
ON8
LP8
V BG
ON8
LP8
ON8
V BG
ON8
GND1
VMLVC
GND1
VMLVA
VMLVAA
ON8
LP8
Current Sensing
and Limiting
VMLVS
R1
GND1
V
SAUVC
R2
ON8
IBIAS
ON8, LP8
GND1
GND1
Pin Description
Pin Name
I/O
Type
Function
Value
VBAT1B
Power Supply
External Pad
Power Supply
3V to 5.5V
VBAT1BB
Power Supply
External Pad
Power Supply
3V to 5.5V
VMLVA
Analog Output
External Pad
Output Voltage
1.7V to 1.9V
VMLVAA
Analog Output
External Pad
Output Voltage
1.7V to 1.9V
VMLVS
Analog Input
External Pad
Sense Voltage
1.7V to 1.9V
VMLVC
Analog Output
Internal Pin
Output Voltage
1.7V to 1.9V
VBAT1C
Auxiliary Power Supply
Internal Pin
Power Supply
3V to 5.5V
GND1
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
ON8
Digital Input
Internal Pin
Enable Command
0V or VBAT1B/VBAT1BB
LP8
Digital Input
Internal Pin
Low Power Mode Command
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
*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, VBAT1B/VBAT1BB = 3V to 5.5V unless otherwise specified, output capacitance = 2.2 µF.
Table 1. Electrical Characteristics
Symbol
Parameter
Condition
Min
VBAT1B/VBAT1BB
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
1.72
1.87
V
80
mA
30
36
µA
2.5
Full Power Mode
VMLVA/VMLVAA
Output Voltage
IMLVA/IMLVAA
Output Current
IQQ
Quiescent Current
∆VDC
Line Regulation
IMLVA/IMLVAA = 80 mA
2
3
mV
∆VTRAN
Transient Line Regulation
IMLVA/IMLVAA = 80 mA
rise time = fall time = 5 µs
2
3
mV
∆VDC
Load Regulation
10% - 90% of max IMLVA/IMLVAA;
2
4.2
mV
∆VTRAN
Transient Load Regulation
10% - 90% of max IMLVA/IMLVAA;
rise time = fall time = 5 µs
5
23
mV
25
VBAT1B/
VBAT1BB = 3V
PSRR(2)
Power Supply Rejection Ratio
at Full Load
VBAT1B/
VBAT1BB =
4.25V
VBAT1B/
VBAT1BB = 5.5V
VN
Output Noise(3)
@100 Hz
-75
dB
@1 kHz
-75
dB
@20 kHz
-55
dB
@100 kHz
-35
dB
@100 Hz
-70
dB
@1 kHz
-70
dB
@20 kHz
-60
dB
@100 kHz
-35
dB
@100 Hz
-65
dB
@1 kHz
-65
dB
@20 kHz
-55
dB
@100 kHz
-35
dB
Bandwidth = 10 Hz to 100 kHz
46
80
µVRMS
3
2705B–PMGMT–03/03
Table 1. Electrical Characteristics (Continued)
Symbol
Parameter
Condition
Min
TR
Rise Time
Full Load 10% - 90% of VMLVA/VMLVAA
ISD
Shut Down Current
ICC
Short-circuit Current Threshold
Typ
Max
Unit
130
µs
1
µA
130
mA
1.9
V
5
mA
11.5
13.75
µA
Low Power Mode
VMLVA/VMLVAA
Output Voltage
1.7
IMLVA/IMLVAA
Output Current
IQQ
Quiescent Current
∆VDC
Line Regulation
IMLVA/IMLVAA = 5 mA
2
3
mV
∆VTRAN
Transient Line Regulation
IMLVA/IMLVAA = 5 mA
rise time = fall time = 5 µs
2
3
mV
∆VDC
Load Regulation
10% - 90% of max IMLVA/IMLVAA
2
5
mV
∆VTRAN
Transient Load Regulation
10% - 90% of max IMLVA/IMLVAA;
rise time = fall time = 5 µs
5
8
mV
9.75
VBAT1B/
VBAT1BB = 3V
PSRR(2)
Power Supply Rejection Ratio
at Full Load
VBAT1B/
VBAT1BB =
4.25V
VBAT1B/
VBAT1BB = 5.5V
(3)
@100 Hz
-70
dB
@1 kHz
-70
dB
@20 kHz
-65
dB
@100 kHz
-35
dB
@100 Hz
-65
dB
@1 kHz
-65
dB
@20 kHz
-55
dB
@100 kHz
-35
dB
@100 Hz
-45
dB
@1 kHz
-45
dB
@20 kHz
-45
dB
@100 kHz
-40
dB
VN
Output Noise
Bandwidth = 10 Hz to 100 kHz
TR
Rise Time
Full Load 10% - 90% of VMLVA/VMLVAA
ISD
Shut Down Current
Notes:
4
90
170
µVRMS
170
µs
1
µA
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.
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
Application Example
ON8
LP8
VMLVA/VMLVAA
0
X
Power down (High-Z)
1
0
Power on, Full Power Mode VMLVA/VMLVAA = 1.8V
1
1
Power on, Low Power Mode VMLVA/VMLVAA = 1.8V
A ceramic capacitor (CL) of 2.2 µF with ESR between 20 mΩ and 250 mΩ connected
from VMLVA/VMLVAA to ground is needed for external compensation.
Description
Min
Typ
Max
Units
Capacitor (CL)
1.8
2.2
2.6
µF
Figure 3. Application Example
2.5V Regulator
(e.g., RE031)
2.5V
VSAUVC
VBAT1B
VBAT1BB
1.231V Bandgap
(e.g., BG019)
VBG
Battery
Pack
VMLVA
VMLVAA
Digital
Core
VMLVS
ON8
LP8
CL
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
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
O u tp u t V o lta g e C h a n g e [m V ]
Output Voltage Change [mV]
0.8
0.6
0.4
0.2
1.5
1.0
V BA T = 3V
0.5
V BA T = 5.5V
0.0
V BA T = 4.25V
-0.5
-1.0
-1.5
-2.0
0.0
3
3.5
4
4.5
5
0
5.5
20
60
5.000
2.000
4.000
1.500
1.000
0.500
0.000
-0.500
-1.000
-1.500
3.000
2.000
1.000
0.000
-1.000
-2.000
V B AT = 4.25V
V B AT = 3V
-3.000
V B AT = 5.5V
-4.000
-2.000
0.35
80
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
2.500
O u tp u t V o lta g e C h a n g e [V ]
Output Voltage Change [mV]
Transient Line Regulation at Full Load
in Full Power Mode
-5.000
0.4
0.45
0.5
0.55
0.35
0.4
Time [ms]
6
40
O u tp u t C u rre n t [m A ]
Battery Voltage [V]
0.45
0.5
0.55
T im e [m s]
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
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
3.0
-10
3.5
4.0
4.5
5.0
5.5
-30
-20
-40
V BA T = 5.5V
-30
V BA T = 4.25V
Freq = 100K Hz
Freq = 20K Hz
-50
-50
P S RR [d B]
P S RR [d B]
-40
V BA T = 3V
-60
-70
-60
Freq = 1K Hz
-70
-80
-80
-90
-90
Freq = 100Hz
-100
-100
-110
-110
F re q [Hz ]
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
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
5
1.0E -11
O u tp u t N o ise [V /sq rt(H z )]
O N8
4.5
4
V o lta g e [V ]
3.5
3
2.5
V MLV
2
1.5
1
Total output nois e 46 µ V R MS
1.0E -12
1.0E -13
1.0E -14
0.5
1.0E -15
0
0
50
100
T im e [ µ s]
150
200
10
100
1000
10000
100000
F re q [H z ]
7
2705B–PMGMT–03/03
Typical Performance Characteristics (Conditions specified on page 10)
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
4.5
5
O u tp u t V o lta g e C h a n g e [m V ]
Output Voltage Change [mV]
Static Line Regulation at Full Load in Low Power Mode
5.0
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
V BA T = 5.5V
4
3
2
V BA T = 4.25V
1
0
-1
-2
-3
V BA T = 3V
-4
-5
0.0
-6
3
3.5
4
4.5
5
5.5
0
1
2
Battery Voltage [V]
Transient Line Regulation at Full Load
in Low Power Mode
O u t p u t V o lta g e C h a n g e [m V ]
Output Voltage Change [mV]
5
1.000
0.500
0.000
-0.500
-1.000
V BAT = 5.5V
5 .5 0 0
4 .5 0 0
3 .5 0 0
V BAT = 4.25V
2 .5 0 0
V BAT = 3V
1 .5 0 0
0 .5 0 0
-0 .5 0 0
0.4
0.45
0.5
0.55
0 .3 5
0 .4
Time [ms]
8
4
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
1.500
-1.500
0.35
3
O u tp u t C u rre n t [m A ]
0 .4 5
0 .5
0 .5 5
Tim e [ m s ]
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
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
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
100
1000
10000
3.0
100000
-40
V B A T = 5.5V
V B A T = 4.25V
P S R R [d B ]
P S R R [d B ]
4.5
5.0
5.5
-40
-60
-70
-50
F req = 1K Hz
-60
F req = 100K Hz
-70
F req = 20K Hz
-80
-80
F req = 100Hz
V B A T = 3V
-90
-100
-100
F re q [H z ]
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
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 -10
O N8
4.5
O u tp u t N o ise [V /sq rt(H z )]
4
3.5
V o lta g e [V ]
4.0
-30
-50
-90
3.5
-20
-30
3
2.5
V MLV
2
1.5
1
Total output nois e 89 µ V R MS
1.0E -11
1.0E -12
1.0E -13
0.5
1.0E -14
0
0
25
50
75
T im e [ µ s]
100
125
150
10
100
1000
10000
10000
F re q [H z ]
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 µs.
Figure 4. Line Regulation
3.4V
VBAT1B/VBAT1BB
3V
5 µs
5 µs
VMLVA/VMLVAA
∆VTRAN
∆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 µs.
Figure 5. Load Regulation
90% of max IMLVA/IMLVAA
IMLVA/IMLVAA
10% of max IMLVA/IMLVAA
5 µs
5 µs
∆VTRAN
VMLVA/VMLVAA
∆VDC
10
RE029 1.8V Dual Mode LDO Regulator
2705B–PMGMT–03/03
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Printed on recycled paper.
2705B–PMGMT–03/03
0M