LTC1522CS8#PBF [Linear]
LTC1522 - Micropower, Regulated 5V Charge Pump DC/DC Converter; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C;
| 型号： | LTC1522CS8#PBF |
| 厂家： | 
Linear |
| 描述： | LTC1522 - Micropower, Regulated 5V Charge Pump DC/DC Converter; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C 开关 光电二极管 |
| 文件： | 总8页 (文件大小：202K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC1522
Micropower, Regulated
5V Charge Pump
DC/DC Converter
U
FEATURES
DESCRIPTION
The LTC®1522 is a micropower charge pump DC/DC
converter that produces a regulated 5V output from a 2.7V
to 5V input supply. Extremely low supply current (6µA
typical with no load, <1µA in shutdown) and low external
parts count (one 0.22µF flying capacitor and two 10µF
capacitors at VIN and VOUT) make the LTC1522 ideally
suited for small, light load battery-powered applications.
Typical efficiency (VIN = 3V) exceeds 75% with load
currents between 50µA and 20mA. Modulating the SHDN
pin keeps the typical efficiency above 75% with load
currents all the way down to 10µA.
■
Ultralow Power: Typical Operating ICC = 6µA
■
Short-Circuit/Thermal Protected
■
Regulated 5V ±4% Output Voltage
2.7V to 5V Input Range
No Inductors
Very Low ICC in Shutdown: <1µA
Output Current:10mA (VIN
20mA (VIN
■
■
■
■
≥
≥
2.7V)
3V)
■
■
■
■
Shutdown Disconnects Load from VIN
Internal Oscillator: 700kHz
Compact Application Circuit (<0.1 in2)
8-Pin MSOP and SO Packages
The LTC1522 has thermal shutdown and can survive a
continuous short from VOUT to GND. In shutdown the
load is disconnected from VIN. The part is available in
8-pin MSOP and SO packages. The LTC1522 is pin
compatible with the LTC1516 in applications where
VIN ≥ 2.7V and IOUT ≤ 20mA.
U
APPLICATIONS
■
SIM Interface Supplies for GSM Cellular Telephones
■
Li-Ion Battery Backup Supplies
■
Local 3V to 5V Conversion
Smart Card Readers
PCMCIA Local 5V Supplies
■
■
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
TYPICAL APPLICATION
Regulated 5V Output from a 2.7V to 5V Input
Efficiency vs Output Current
90
V
1
2
3
4
8
7
6
5
V
IN
= 3V
IN
2.7V TO 5V
NC
NC
SHDN
GND
+
10µF
V
ON/OFF
IN
80
70
60
50
LTC1522
LOW I MODE
Q
V
OUT
(SEE FIGURE 2)
+
10µF
+
–
SHDN = 0V
C
C
0.22µF
V
OUT
I
= 5V ±4%
= 0mA TO 10mA, V ≥ 2.7V
OUT
OUT
IN
IN
I
= 0mA TO 20mA, V ≥ 3V
0.01
0.1
1
10
100
1522 TA01
OUTPUT CURRENT (mA)
1522 TA02
1
LTC1522
W W U W
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN to GND.................................................. –0.3V to 6V
Commercial Temperature Range ................ 0°C to 70°C
Extended Commercial Operating
V
OUT to GND ............................................... –0.3V to 6V
SHDN to GND ............................................. –0.3V to 6V
VOUT Short-Circuit Duration............................ Indefinite
Temperature Range (Note 2) ............. –40°C to 85°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
U
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PACKAGE/ORDER INFORMATION
ORDER PART
ORDER PART
TOP VIEW
NUMBER
NUMBER
TOP VIEW
NC
1
2
3
4
8
7
6
5
NC
NC
1
2
3
4
8 NC
V
SHDN
GND
IN
LTC1522CMS8
LTC1522CS8
V
7 SHDN
6 GND
IN
V
V
OUT
OUT
–
+
5 C
C
+
–
C
C
MS8 PACKAGE
8-LEAD PLASTIC MSOP
MS8 PART MARKING
LTCG
S8 PART MARKING
1522
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 160°C/ W
TJMAX = 125°C, θJA = 150°C/ W
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
VIN = 2.7V to 5V, CFLY = 0.22µF, CIN = COUT = 10µF, TMIN to TMAX unless otherwise specified. (Note 2)
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
V
Input Voltage
Output Voltage
●
2.7
4.8
4.8
5
5.2
5.2
15
1
V
V
V
µA
µA
µA
IN
2.7V
3V
2.7V
≤
V
IN
≤
5V, I ≤
OUT
10mA
●
●
5.0
5.0
6
OUT
IN
≤
≤
V
≤
5V, I
≤
≤
20mA
OUT
I
Operating Supply Current
Shutdown Supply Current
V
5V, I = 0mA, SHDN = 0V
OUT
●
CC
IN
2.7V ≤ V ≤ 3.6V, I
3.6V < V ≤ 5V, I
= 0mA, SHDN = V
●
●
0.005
IN
OUT
IN
= 0mA, SHDN = V
2.5
IN
OUT
IN
Output Ripple
Efficiency
V
V
= 3V, I
= 3V, I
= 10mA
= 10mA
70
82
mV
P-P
IN
IN
OUT
OUT
%
f
V
V
I
I
t
Switching Frequency
SHDN Input Threshold
Oscillator Free Running
700
kHz
V
V
µA
µA
ms
OSC
●
●
●
●
(0.7)(V )
IH
IL
IN
0.4
–1
–1
SHDN Input Current
V
V
V
= V
IN
= 0V
1
1
IH
SHDN
SHDN
IL
V
Turn-On Time
= 3V, I = 0mA
OUT
1
ON
OUT
IN
The
range.
●
denotes specifications which apply over the specified temperature
Note 2: C grade device specifications are guaranteed over the 0°C to 70°C
temperature range. In addition, C grade device specifications are assured
over the –40°C to 85°C temperature range by design or correlation, but
are not production tested.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
2
LTC1522
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TYPICAL PERFORMANCE CHARACTERISTICS
Output Voltage vs Input Voltage
Efficiency vs Input Voltage
Output Ripple vs Input Voltage
90
80
70
60
50
40
5.15
5.10
5.05
5.00
4.95
4.90
250
200
150
100
50
I
= 10mA
I
= 10mA
OUT
I
= 10mA
OUT
A
OUT
OUT
T
= 25°C
C
= 10µF
C
= 0.1µF
FLY
T
= 25°C
A
C
= 3.3µF
OUT
T
= 70°C
= 25°C
A
C
OUT
= 6.8µF
T
= 0°C
A
C
= 10µF
= 22µF
T
OUT
A
C
OUT
0
2.5
3.0
3.5
4.0
4.5
5.0
2.5
3.0
3.5
4.0
4.5
5.0
2.5
3.0
3.5
4.0
4.5
5.0
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
1522 G02
1522 G01
1522 G03
No Load Input Current
vs Input Voltage
Typical Output Voltage
vs Output Current
Load Transient Response
9
8
7
6
5
4
5.2
5.1
5.0
4.9
4.8
T
C
C
= 25°C
I
= 0mA
A
OUT
= 0.1µF
FLY
= 6.8µF
OUT
IOUT
0mA TO 10mA
10mA/DIV
T
A
= 70°C
T
= 25°C
A
VOUT
AC COUPLED
50mV/DIV
T
A
= 0°C
V
IN
= 2.7V
V
IN
= 3V
V
= 3.3V
IN
V
IN = 3V
500µs/DIV
1522 G06
COUT = 10µF
2.5
3.0
3.5
4.0
4.5
5.0
40
60
0
80
20
INPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
1522 G05
1522 G04
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U
U
PIN FUNCTIONS
C– (Pin 5): Flying Capacitor, Negative Terminal.
GND (Pin 6): Ground.
NC (Pin 1): No Connect.
VIN (Pin 2): Input Supply Voltage. Bypass VIN with a
≥3.3µF low ESR capacitor.
SHDN (Pin 7): Active High CMOS Logic-Level Shutdown
Input. Drive SHDN low to enable the DC/DC converter. Do
not float.
VOUT (Pin 3): 5V Output Voltage (VOUT = 0V in Shutdown).
Bypass VOUT with a ≥3.3µF low ESR capacitor.
C+ (Pin 4): Flying Capacitor, Positive Terminal.
NC (Pin 8): No Connect.
3
LTC1522
W
BLOCK DIAGRAM
SHDN
V
IN
+
C
IN
10µF
S2A
S2B
V
OUT
+
S1A
C
OUT
+
–
C
10µF
1µA
C
FLY
0.22µF
COMP1
CLOCK 1
CLOCK 2
C
+
–
S1B
CONTROL
LOGIC
CHARGE PUMP
V
REF
LTC1522 BD
CHARGE PUMP SHOWN IN DISCHARGE CYCLE
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APPLICATIONS INFORMATION
Operation
high is applied to the SHDN pin. The SHDN pin should not
be floated; it must be driven with a logic high or low.
The LTC1522 uses a switched capacitor charge pump to
boost VIN to a regulated 5V ±4% output voltage. Regula-
tion is achieved by sensing the output voltage through an
internal resistor divider and enabling the charge pump
when the output voltage droops below the lower trip point
of COMP1. When the charge pump is enabled, a 2-phase,
nonoverlappingclockcontrolsthechargepumpswitches.
Clock 1 closes the S1 switches which enables the flying
capacitor to charge up to the VIN voltage. Clock 2 closes
the S2 switches that stack CFLY in series with VIN and
connect the top plate of CFLY to the output capacitor at
VOUT. This sequence of charging and discharging contin-
ues at a free-running frequency of 700kHz (typ) until the
output has risen to the upper trip point of COMP1 and the
charge pump is disabled. When the charge pump is
disabled, the LTC1522 draws only 4µA (typ) from VIN
which provides high efficiency at low load conditions.
Short-Circuit/Thermal Protection
During short-circuit conditions, the LTC1522 will draw
between 100mA and 200mA from VIN causing a rise in
the junction temperature. On-chip thermal shutdown
circuitry disables the charge pump once the junction
temperature exceeds ≈160°C, and reenables the charge
pumponcethejunctiontemperaturefallsbackto≈145°C.
The LTC1522 will cycle in and out of thermal shutdown
indefinitely without latchup or damage until the VOUT
short is removed.
Capacitor Selection
For best performance, it is recommended that low ESR
(<0.5Ω) capacitors be used for both CIN and COUT to
reduce noise and ripple. The CIN and COUT capacitors
should be either ceramic or tantalum and should be 3.3µF
or greater (aluminum capacitors are not recommended
because of their high ESR). If the input source impedance
is very low, CIN may not be needed. Increasing the size of
COUT to 10µF or greater will reduce output voltage ripple.
In shutdown mode, all circuitry is turned off and the part
draws only leakage current from the VIN supply. VOUT is
also disconnected from VIN. The SHDN pin is a CMOS
input with a threshold of approximately VIN/2; however,
the SHDN pin can be driven by logic levels that exceed the
VIN voltage. The part enters shutdown mode when a logic
4
LTC1522
U
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APPLICATIONS INFORMATION
Aceramiccapacitorisrecommendedfortheflyingcapaci-
tor with a value in the range of 0.1µF to 0.22µF. Note that
a large value flying cap (> 0.22µF) will increase output
ripple unless COUT is also increased. For very low load
applications, CFLY may be reduced to 0.01µF to 0.047µF.
This will reduce output ripple at the expense of efficiency
and maximum output current.
LTC1522
3
3
V
OUT
5V
V
OUT
+
+
15µF
1µF
TANTALUM
CERAMIC
LTC1522
3.9Ω
V
OUT
5V
V
OUT
+
10µF
TANTALUM
10µF
TANTALUM
1522 F01
Output Ripple
Figure 1. Output Ripple Reduction Techniques
NormalLTC1522operationproducesvoltagerippleonthe
V
OUT pin.OutputvoltagerippleisrequiredfortheLTC1522
to regulate. Low frequency ripple exists due to the hyster-
esisinthesensecomparatorandpropagationdelaysinthe
chargepumpenable/disablecircuits.Highfrequencyripple
is also present mainly due to ESR (Equivalent Series
Resistance) in the output capacitor. Typical output ripple
under maximum load is 50mVP-P with a low ESR 10µF
output capacitor.
In low load or high VIN applications, smaller values for
CFLY may be used to reduce output ripple. A smaller flying
capacitor (0.01µF to 0.047µF) delivers less charge per
clock cycle to the output capacitor resulting in lower
output ripple. However, the smaller value flying caps also
reduce the maximum IOUT capability as well as efficiency.
Inrush Currents
The magnitude of the ripple voltage depends on several
factors.Highinputvoltages(VIN >3.3V)increasetheoutput
ripple since more charge is delivered to COUT per clock
cycle. A large flying capacitor (>0.22µF) also increases
ripple for the same reason. Large output current load and/
or a small output capacitor (<10µF) results in higher ripple
due to higher output voltage dV/dt. High ESR capacitors
(ESR > 0.5Ω) on the output pin cause high frequency
voltage spikes on VOUT with every clock cycle.
During normal operation, VIN will experience current tran-
sients in the 50mA to 100mA range whenever the charge
pump is enabled. During start-up, these inrush currents
may approach 250mA. For this reason, it is important to
minimize the source resistance between the input supply
and the VIN pin. Too much source resistance may result in
regulation problems or even prevent start-up.
Ultralow Quiescent Current (IQ = 2.1µA)
Regulated Supply
There are several ways to reduce the output voltage ripple.
A larger COUT capacitor (22µF or greater) will reduce both
the low and high frequency ripple due to the lower COUT
charging and discharging dV/dt and the lower ESR typi-
cally found with higher value (larger case size) capacitors.
A low ESR ceramic output capacitor will minimize the high
frequency ripple, but will not reduce the low frequency
rippleunlessahighcapacitancevalueischosen.Areason-
able compromise is to use a 10µF to 22µF tantalum
capacitor in parallel with a 1µF to 3.3µF ceramic capacitor
on VOUT to reduce both the low and high frequency ripple.
An RC filter may also be used to reduce high frequency
voltage spikes (see Figure 1).
The LTC1522 contains an internal resistor divider (refer to
the Block Diagram) that draws only 1µA (typ) from VOUT
.
During no-load conditions, the internal load causes a
droop rate of only 100mV per second on VOUT with
COUT = 10µF. Applying a 2Hz to 100Hz, 95% to 98% duty
cycle signal to the SHDN pin ensures that the circuit of
Figure 2 comes out of shutdown frequently enough to
maintain regulation during no-load or low-load condi-
tions. Since the part spends nearly all of its time in
shutdown,theno-loadquiescentcurrent(seeFigure3a)is
approximately equal to (VOUT)(1µA)/(VIN)(Efficiency).
5
LTC1522
APPLICATIONS INFORMATION
U
W U U
1
2
3
4
8
7
6
5
NC
NC
SHDN
GND
V
IN
V
IN
FROM MPU
SHDN PIN WAVEFORMS:
2.7V TO 5V
+
LTC1522
10µF
V
OUT
+
10µF
+
–
C
C
LOW I MODE (2Hz TO 100Hz, 95% TO 98% DUTY CYCLE)
V
LOAD ENABLE MODE
Q
OUT
I
≤ 100µA
(I
= 100µA TO 20mA)
OUT
OUT
0.22µF
1522 F02
V
OUT
5V ±4%
Figure 2. Ultralow Quiescent Current (<2.1µA) Regulated Supply
1000
6.0
4.0
2.0
0.0
SHDN ON PULSE WIDTH = 200µs
= 10µF
C
OUT
100
10
1
1
10
100
1000
2.0
3.0
4.0
5.0
OUTPUT CURRENT (µA)
1522 F03b
INPUT VOLTAGE (V)
1522 F03a
Figure 3a. No-Load ICC vs Input Voltage for Circuit in Figure 3
Figure 3b. Maximum SHDN OFF Time vs Output Load Current
for Ultralow IQ Operation
The LTC1522 must be out of shutdown for a minimum Each time the LTC1522 comes out of shutdown, the part
durationof200µstoallowenoughtimetosensetheoutput delivers a minimum of one clock cycle worth of charge to
and keep it in regulation. A 2Hz, 98% duty cycle signal will theoutput.UnderhighVIN(>3.3V)and/orlowIOUT(<10µA)
keep VOUT in regulation under no-load conditions. As the conditions, thisbehaviormaycauseanetexcessofcharge
VOUT load current increases, the frequency with which the to be delivered to the output capacitor if a high frequency
part is taken out of shutdown must also be increased to signal is used on the SHDN pin (e.g., 50Hz to 100Hz).
prevent VOUT from drooping below 4.8V during the OFF Under such conditions, VOUT will slowly drift positive and
phase (see Figure 3b). A 100Hz 98% duty cycle signal on may even go out of regulation. To avoid this potential
theSHDNpinensuresproperregulationwithloadcurrents problem in the low IQ mode, it is necessary to switch the
as high as 100µA. When load current greater than 100µA part in and out of shutdown at the minimum allowable
is needed, the SHDN pin must be forced low as in normal frequency (refer to Figure 3b) for a given output load.
operation. The typical no-load supply current for this
circuit with VIN = 3V is only 2.1µA.
6
LTC1522
U
W U U
APPLICATIONS INFORMATION
General Layout Considerations
Due to the high switching frequency and high transient
currents produced by the LTC1522, careful board layout
is a must. A clean board layout using a ground plane and
short connections to all capacitors will improve perfor-
mance and ensure proper regulation under all conditions
(refer to Figure 4).
C
IN
1
8
+
+
V
IN
2
3
7
6
SHDN
LTC1522
V
OUT
GND
C
OUT
4
5
C
FLY
1522 F04
Figure 4. Suggested Component Placement for LTC1522
U
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
MS8 Package
8-Lead Plastic MSOP
(LTC DWG # 05-08-1660)
0.118 ± 0.004*
(3.00 ± 0.102)
8
7
6
5
0.040 ± 0.006
(1.02 ± 0.15)
0.034 ± 0.004
(0.86 ± 0.102)
0.007
(0.18)
0° – 6° TYP
0.118 ± 0.004**
(3.00 ± 0.102)
SEATING
PLANE
0.192 ± 0.004
(4.88 ± 0.10)
0.012
(0.30)
REF
0.021 ± 0.006
(0.53 ± 0.015)
0.006 ± 0.004
(0.15 ± 0.102)
0.0256
(0.65)
TYP
MSOP (MS8) 1197
1
2
3
4
*
DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH,
PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
0.010 – 0.020
(0.254 – 0.508)
7
5
8
6
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0°– 8° TYP
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
0.016 – 0.050
0.406 – 1.270
0.050
(1.270)
TYP
0.014 – 0.019
(0.355 – 0.483)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
SO8 0996
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
1
2
3
4
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
7
LTC1522
TYPICAL APPLICATION
U
Programmable 5V/3V SIM Interface Supply for GSM Cellular Phones
D1
Q1
3V
TRUTH TABLE
A
0
0
1
1
B
0
1
0
1
V
CC
NOT USED
3V
R1
470k
A
5V
SHUTDOWN
1
8
3
NC
NC
2
V
IN
V
V
= 5V OR 3V
CC
OUT
(SEE TRUTH TABLE)
D1 = BAS70-05
+
LTC1522
B
10µF
7
4
6
5
SHDN
GND
Q1 = Si6943DQ
+
+
–
10µF
C
C
GSM
CONTROLLER
0.22µF
V
CC
RST
CLK
I/O
LEVEL SHIFT
SIM CARD
GND
1522 TA03
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LTC1144
20mA Switched Capacitor Converter for Up to 20V Inputs
5V to 12V Regulated Switched Capacitor Converter
Includes Micropower Shutdown (8µA)
LTC1262
Up to 30mA at Regulated Output
LTC1514/15
LTC1516
Step-Up/Step-Down Switched Capacitor DC/DC Converters
Micropower, Regulated 5V Charge Pump DC/DC Converter
Micropower, Regulated 5V Charge Pump DC/DC Converter
SIM Power Supply and Level Translator
V
2V to 10V, V
is Fixed or Adjustable, I
to 50mA
IN
OUT
OUT
I
= 20mA (V ≥ 2V), I
= 50mA (V ≥ 3V)
OUT IN
OUT
IN
LTC1517-5
LTC1555/56
LTC660
LTC1522 Without Shutdown and Packaged in SOT-23
Step-Up/Step-Down SIM Power Supply and Level Translators
5V to –5V Conversion with Low Voltage Loss
100mA CMOS Voltage Converter
1522f LT/TP 0198 4K • PRINTED IN USA
Linear Technology Corporation
●
1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900
8
●
●
LINEAR TECHNOLOGY CORPORATION 1997
FAX: (408) 434-0507 TELEX: 499-3977 www.linear-tech.com
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