LM3525AN ,PULSE WIDTH MODULATORElectrical Characteristics
Vin = 20 Vdc, Boldface limits apply from TMIN to TMAX (Note 1), all oth ..
LM3525M-H ,Single Port USB Power Switch and Over-current ProtectionLM3525 Single Port USB Power Switch and Over-Current ProtectionSeptember 2004LM3525Single Port USB ..
LM3525M-H/NOPB ,Single Port USB Power Switch and Over-current Protection 8-SOIC -40 to 125Electrical CharacteristicsLimits in standard typeface are for T = 25°C, and limits in boldface type ..
LM3525M-L ,Single Port USB Power Switch and Over-current ProtectionApplicationsTypical Operating Circuit and Connection Diagram10105502LM3525M-L1010553110105501101055 ..
LM3525MX-H ,Single Port USB Power Switch and Over-current ProtectionElectrical specifications do not apply whenoperating the device beyond its rated operating conditio ..
LM3525MX-H/NOPB ,Single Port USB Power Switch and Over-current Protection 8-SOIC -40 to 125FEATURES DESCRIPTIONThe LM3525 provides Universal Serial Bus standard2• Compatible with USB1.1 and ..
LMU18JC35 , 16 x 16-bit Parallel Multiplier
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LMUN2113LT1G , Bias Resistor Transistors
LMUN2211LT1G , BIAS RESISTOR TRANSISTOR, NPN SILICON SURFACE MOUNT TRANSISTOR WITH MONOLITHIC BIAS RESISTOR NETWORK
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LMUN5211T1G , Bias Resistor Transistor NPN Silicon Surface Mount Transistor with Monolithic Bias Resistor Network
LM3525AN
PULSE WIDTH MODULATOR
National
[ Semiconductor
LM 1 525A/ LM3525A/ LM 1 527A/ LM 3527A
Pulse Width Modulator
General Description
The LM1525A/1527A series of pulse-width-modulator in-
tegrated circuits are designed to offer improved perform-
ance and lowered external parts count when used to imple-
ment all types of switching power supplies. The on-chip
+5.1V reference is trimmed to 11% initial accuracy, and
the input common mode range of the error amplifier in-
cludes the reference voltage, eliminating external potenti-
ometers and dividers. A Sync input to the oscillator permits
multiple devices to be slaved together, or a single device to
be synchronized to an external system clock. A single resis-
tor between the CT pin and the Discharge pin provides a
wide range of deadtime adjustment. These devices also fea-
ture built-in soft-start circuitry with only a timing capacitor
required externally. A Shutdown pin controls both the sott-
start circuitry and the output stages, providing instante-
neous turn-off with sott-start recycle for slow turn-on. These
functions are also controlled by an undervoltage lockout
which keeps the outputs off and the ttoft-start capacitor dis-
charged for input voltages less than that required for normal
operation. The undervoltage lockout circuitry features ap-
proximately 200 mV of hysteresis to prevent threshold oscil-
lations. Another unique feature of these improved PWM in-
tegrated circuits is the latch following the comparator (thus
preventing double-pulsing). Once a PWM pulse has been
terminated for any reason, the outputs will remain OFF for
the duration of that period. The latch is reset with each
clock pulse. The output stages are totem-poie designs ca-
pable of sourcing or sinking more than 200 mA. The
LM1525A output stage features NOR logic, resulting in
LOW outputs for an OFF stage. The LM1527A uses OR
logic which results in HIGH outputs when OFF.
Features
I: 8 to 35V operation
I: 5.1V reference trimmed to i1°/o
u 100 Hz to 500 kHz oscillator range
a Separate oscillator sync terminal
a Adjustable deadtime control
Internal soft-start
Input undervoltage lockout with hysteresis
Latching P.W.M. to prevent multiple pulses
Dual source/sink output drivers
Block & Connection Diagrams
mcti) ', 11 OUTPUT A
1 ', 's.2
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tti? " l = , N.IJNPUT- 2 15 v-OVN
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W®N I ', osc.omPUT- 4 LM1525A] 13 -Vc
r " I " OUTPUTS cr- 5 LM1527A 12 -tiR00N0
R I ', n,- e 11 -OUTPUTA
cow. 0 t,.2t s WC" I I msctiARcE- 7 10 -SHO
Va - - l = ' 'ior'T-STMt-1 a s -00MP:NSA110N
IN. NW1 0 Yesr ', "ily''" I
$0 ', ---------- 1 TL/H19112-2
" MNT 9 'lg'.' ph I wlsggéwm Top View
strT-smrr(isF-'''C'"- l
7....“ ,' h: Order Number LM1525AJ,
m ,' LM3525AJ, LM1527AJ, LM3527AJ,
snum CE) " ,' LM3525AN or LM3527AN
at $05: ' See NS Package Number
1m " WW‘ J16A orN16A
VLZSEW'l/VSZSEW'I/VLZSL W'I/VSZSLW'I
LM1525A/LM1527AILM3525AILM3527A
Absolute Maximum Ratings (Note 7)
" MllltaryIAerospace specified devices are required,
please contact the National Semiconductor Sales
OttlttefDlBtrittutortt for avallablllty and trpettlffttatlons,
Storage Temperature
LM1525A, LM1527A
--65% to + 150°C
Operating Temperature Range (Tmin S T, S Tmax)
--55'Cto +150°C
Input Voltage (Pins 13, and 15) -0.3V to + 40V LM3525A, LM3527A 0°C to + 150'C
Reference Output Current (Pin 16) 50 mA DC Lead Temperature (Soldering, 4 Seconds)
Reference Output Short Circuit 5 Seconds J Package + 30°:C
Output Current (Pins 11, 14) l 200 mA N "ft . + 260 C
Oscillator Current (Pins 5, 6, 7) (Note a) 5 mA DC 2gre:',t'n"eon (Note 9) 1 Watt
o erance
Op Amp Inputs: VCM -0.3V to + Vin =r. =
(Pins l, 2) VDIFF 16V Czap 100 pF, Rzap 1.5k 2000V
Logic Inputs - 0.3V to + 5.5V
Electrical Characteristics
Vin = 20 Vdc, Boldface limits apply from TMW to TMAX (Note I), all other limits Ti = 25''C unless otherwise noted
LM1525A LM3525A
LM1527A LM3527A
Parameter Gttntiltltttt8 Tested D 9 al gn Taste d Deslgn Unlta
Typlcal lelt lelt Typical lell lelt
(Note 2) (Note 3) (Note 2) (Note 3)
REFERENCE SECTION
Reference Voltage Output Ti = 25''C 5.10 5.05 5.10 5.00 Vmin
5.15 5.20 Vmax
Line Regulation +8.0V S Vin S + 35V 10 2O 10 15 20 mvmax
Load Regulation 0 mA S IL S 20 mA 20 BO 20 2O 50 meax
Temperature Stability 20 BO 20 so meax
Reference Voltage Output +8.0V S Vin S + 35V 5.08 5.20 5.08 5.25 Vmax
0 mA S 1L S 20 mA 5.00 4.95 Vmin
And Over Operating Temp.
Short CircuitCurrent Ti = 25''C Vref = ov 70 100 70 100 mAmax
Output Noise Voltage 10 Hz S f S 10 kHz 40 200 40 200 erms
T] = 25''C max
Long Term Stability Ti = 125°C 20 50 20 50 mV/KHour
OSCILLATOR SECTION (Note 4) Unless otherwise specified
Initial Accuracy T] = 25°C i 2 i 6 i 2 i 6 %
Accuracy of Freq. vs. Temp. i 3 i 8 * 3 i 1 0 %
Voltage Stability 8.0V S Vin S 35V 10.3 i 1 10.3 i 2 i 2 %
Temperature Stability AFosc/Fosc i 3 , tt i 3 , 6 %
Minimum Frequency RT == 300 kn, Cr = 0.1 pF. 70 100 70 90 100 Hz max
RD = 0 (Note 5)
Maximum Frequency RT --- 2.0 110.01 = 1 nF, 450 400 450 430 400 kHz min
RD == 0
Current Mirror bin 5 IRT = 2.0 mA 2.0 1.1 2.0 1.8 1.7 mAmin
' 2.2 2.1 " mAmax
Clock Amplitude At pin 4 3.5 3.0 3.5 3.0 Vmin
Clock Width Ti = 25''C 0.5 1.0 0.5 1.0 ps max
0.3 0.3 iM) min
Sync Threshold (Note 6) 1.8 1.2 1.8 1.25 1.2 V min
" A8 2.8 V max
Sync InputCurrent Sync Voltage = 3.5V 1.0 2.5 1.0 2.30 2.5 mAmax
Electrical Characteristics
Vin = 20 Vdc, Boldface limits apply from Tue: to TMAX (Note I), all other limits T] = 25°C unless otherwise noted (Continued)
LM1525A LM3525A tt
LM1527A LM3527A h"
Parameter Conditions Tested Design Tested Design Units at
Typlcal lelt lelt Typical Llrnlt Umit p,
(Note 2) (Note 3) (Note 2) (Note 3) tt
ERROR AMPLIFIER SECTION VCM = 5.1V. Unless otherwise noted E
Input Offset Voltage 0.5 S 2 1 o meax a
Input Bias Current 1 1 tt 1 2 1 0 PAmax g
Input Offset Current 0.1 1 0.1 0.8 1 WAmax pe
DC Open Loop Gain RL 2 10 Mn 80 tttt 80 66 00 dB min E
Gain Bandwidth Product Av = 0, T] = 25'C 2 1 2 1 MHzmin ."d
h g 30 pF >
Output Low Level 0.2 0.5 0.2 0.4 0.5 Vmax
Output High Level 5.6 3.8 5.6 4.1 3.8 me
Common Mode Repotion va, = 1.5V to 5.2V 80 tttt 80 70 66 dB min
Supply Voltage Rejection Ihr: = 8V to 35V 90 60 90 64 00 dB min
P.W.M. COMPARATOR
Minimum Duty Cycle o 0 0 % max
Maximum Duty Cycle 49 " 49 46 " % min
Input Threshold Zero Duty Cycle 0.9 0.6 0.9 0.70 0.6 Vmin
Input Threshold Max. Duty Wcla 3.3 " 3.3 3.6 3.8 Vmax
Input Bias Current 0.05 1 .0 0.05 q At pAmax
SOFr-STAHT SECTION
Soft Start Current VSHUTDOWN = OV 50 80 50 74 BO pAmax
" 36 " "Amin
Soft Start Voltage VSHUTDOWN = 2.0V 0.35 0.8 0.35 0.5 0.6 Vmax
Shutdown Input Current VSHUTDOWN = 2.5V 0.4 1 .0 0.4 0.85 1.0 mAmax
OUTPUT DRIVERS (Each Output) VC = 20V, Unless otherwise noted
Undervoltage Lockout Hysteresis 0.2 0.2 V
Output Low Level Iseo; = 20 mA 0.2 0.4 0.2 0.35 0.4 Vmax
ISM = 100 mA 1.0 2.0 1.0 1.9 2.0 Vmax
Output High Level .SOURCE = 20 mA 19 1 tt 19 18.2 1 tt Vmin
ISOURCE = 100 mA 18 1 T 18 17.4 1 T vmin
Undervoltage Lockout VCQMP and vss = High 7 s 7 7.7 tt Vrnax
8 6.3 6 Vmin
Collector Leakage LM1525A and LM3525A Only 200 120 200 WAmax
vc = 35V
Rise Time CL = 1 nf, Ti = 25t 100 600 100 600 ns max
Fall Time Ct, = 1 nf, T; = 25°C 50 300 50 300 ns max
LM1525A/LM1527A/LM3525A/LM3527A
Electrical Characteristics
Vin = 20 l/de, Boldface limits apply from TMIN to TMAX (Note ll, all other limits Tj == 25''C unless otherwise noted (Continued)
LM1525A LM3525A
LM1527A LM3527A
Parameter Condltlons Teste d Design Taste d Design Unlts
Typical Limit lelt Typical Llmlt leIt
(Note 2) (Note 3) (Note 2) (Note 3)
Shutdown Delay VSD = 3V, CL = o, 200 500 200 500 ns max
Ti = 25°C
TOTAL STANDBY CURRENT
Supply Current " = 35V 13 " 13 14.5 " mA
Note 1: Unless otherwise noted these trpecifiattions apply: -55% < T; < +125°C for LM1525A and LM1527A. trc < T. < + 125°C tor LM3525A and LM3527A
Note 2.. Tested limits are guaranteed and 100% tested in production.
Note 3: Design limits are guaranteed (but not 100% production tested) over the indicated temperature and supply ranges
Note 4: Tested at Fom, = 40 kHz (Rt = 3.6K. Ct = 0.01 pf. Rd - 0).
Note 5: These specifications are also guaranteed with Rt --- 150k, Ct -- 0.2 p.F. Rd = 0.
Nate lk Tested with a pulse of width 500 ns and amplitudes of 1.2 and 2.8V at 50 kHz.
Note 7: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical trpsscifieetltms do not apply when operatlng
the device beyond its rated operating conditions. See Note 1 and conditions.
Note tk Do not ground pin 6.
Note tr: For operation at elevated temperatures, devices in the J package must be deleted based on thermal resistance of BO'CIW (junction to ambient). or
85'C/W in the N package.
SHUTDOWN OPTIONS (Stats Block Diagram) Holding pin 10 high for a long time will ultimately discharge
1. Since both the compensation and soft-start terminals the soft-start capacitor, thus recycling slow turn on upon
(pins 9 and 8) have current source pull-ups, either can release. This method of shutdown is the fastest shutdown
readily accept a pull-down signal which only has to sink a possible,
maximum of 100 PA to turn off the outputs. This is sub. SYNCHRONIZATION PROCEDURE
ject to the added requirement of discharging whatever
external capacitance may be attached to these pins.
2. An alternative approach is the use of the shutdown cir-
cuitry of pin 10. Activating this circuit by applying a posi-
The device may be synchronized to an external clock; how-
ever the following points have to be observed: a) The fre-
quency of the tree-running oscillator of the device must be
. set at least 10% less than the frequency of the external
tive-going pulse at r?ir.1 IO wlll result ") the output of the clock. b) The external clock pulse must be at least 300 ns
comparator gang high, and thus turning off the outputs. wide but must not exceed the free-running pulse width (pin
The pulse will start the fast discharge of the soft-start 4) by more than 200 ns. c) The amplitude of the external
capacitor. If the shutdown command is short, the PWM pulse must be between 2 and 5V.
signal is terminated without significant discharge of the
soft-start capacitor, thus allowing, for example, a conve-
nient implementation of pulse-by-pulse current limiting.
Multiple devices may be synchronized together by connect-
ing all pin 4's together and all pin 5's together; pins 6 and 7
of slave oscillator must be left open.
LM1525A Comparator
30ph l I2 son I, son Is V l 200ph
02 04 RM,
Jflt,t tll 03 --o FROM
OSCILLATOR
o1 SK TO
R" ef, OUTPUT
soo " 500 KI
" R2 " 10K CLOCK
cs r-644,--o men
_,) R5 OSCILLATOR
l0 snumown PIN
saunas tstnafl ”2m
TL/HAM 12-3
LM1525A Output Section
thr VIN
. LATCH
"th omitted in LM1527A.
th replaced by a 2K resistor in LM1527A.
l, UV l OSC
TL/HMM 12-6
VtZSSW'I/VSZSSIN'l/VLZSLW'I/VSZSl-W'l
LM1525AILM1527A/LM3525AILM3527A
LM1525A Oscillator
LM1525A Error Amplifier
TL/Hh9112-4
TL/HMM12-5
4 Vsat " Utne
M1 0.1
lmx (AMPS)
a Line Regulation
'i'-,'' 2
a 18 28
u (vans)
15 Supply Current " Vm
0512 AT 40 kHz
0 10 2.0 30 40
v" (vans)
Oscillator Charge
Tltntt " Rr
RT. mm m (kn)
' so 500
came: me (ya)
4 Vsat " Source Current
vs” (vans)
om on: 0.1 " I
|souuz (nes)
Typical V... "
" Temperature
45-50-25 0 25 so 75100125150175
TEMP (N)
m Supply Current vs Temp.
'5 (mA)
-75-50-25 0 25 50 75111115150175
TEMP (N)
Oscillator Dlscharge
wTIme vs RD and CT
'Isl'. m
bu 200
' V“, " Temp at 100 mA
Vsn (VOW)
SINKING 100 ttth
'75-50-25 " B 50 75100125150175
TEW' te)
vm Short-CIrcult
”CurrentlTemp
'51: (IM)
‘55-50 '5 N 45 70 0512015170
TIIIP te)
Duty Cycle "
Jn 9 Voltage
DUTY (2101(1)
1 2 5 4
VOLTS AT P1119
Error Ampllller Open-Loop
Response
AVOL' VOLTA6£ 6AM (d8)
1 10 100 tlt 10(10G(1M 10H100H
f, FREQUENCY (Hz)
TL/H/0112-14
VLZSSN'l/VSZSSW'l/VAZSLW'I/VSZSl-W'I
LM1525A/LM1527A/LM3525A/LM3527A
LM1525A Typical Tlmlng Diagram
. ERROR AMP .
RAMP -
cum 1 n 1 1 1
[mummo trot TO mcuoms: IMMUNITY)
I I I I ' ' ..-.
COMP. I I I I I I
- IO 5.. - -
FLOP-FLOP
OUTPUT Al;
Mil 0513, - P.
CLOCK, I
mo coup.
LMISZSA
FLOP-FLOP '
ouwu1(a_);
won or o,
CLOCK.
AND coup.
TLfH/tM12-7
Typical Applications
5 Watt Single Ended Step Down Converter
1: 5,e
4.7K .
"ss-ok 0.01 pF
l -EA 5.1
2 .EA v”
o.-' SYNC OUTPUT a
o-d. osc our vc
LM1525A
5 c, GND
. R1 ouwur A
7 mscn. suumovm CI..
'y' a 9 - sax th01 pr
x-ll-''- son-sum coumsmou '----iitie-H
- RC k -
" = 28V Q ' 04501-12 TL/Hl9112-e
vow = 5.1V D = 1~5521
L = 150 11H
Go = 500 ,1;
Typical Applications (Continued)
Bipolar Drive for Push-Pull Converters
wSUPPLY Q-
LM1 525A
RETURN
TLn4/9112-9
3 MOSFET Drive for Push-Pull Converters
"sueecr
RETURN
Dlrocl Drive for Transformer
LM1525A
'vstmstre "
LM1525A
RETURNC t.
TL/HI9112-10
TLlH/9112-11
VlZSSW'I/VSZSSW'l/VAZSLW'IIVSZS lW'l
LM1525A/LM1527A/LM3525A/LM3527A
Typical Applications (Continued)
LM1525A/ 1527A Lab Teat leture
Mess I
CLOCK I th 1
DEAD‘HME
\l '0- m -o- u on- . --
_- ------ IO --n- 0|
,------- n
REFERENCE
REGULATOR
00¢...
W04>rF—OUDO
---- a -. B ------
- ©cno
SOFTSTART
4.7 pF
TL/H/9112-t2
D.U.T. -
This datasheet has been :
www.ic-phoenix.com
Datasheets for electronic components.
National Semiconductor was acquired by Texas Instruments.
corp/docs/irwestor_relations/Pr_09_23_201 1_national_semiconductor.html
This file is the datasheet for the following electronic components:
LM3525A - product/Im3525a?HQS=TI-nulI-nu|I-dscatalog-df-pf-nulI-wwe
LM3525AJ - product/lm35253j?HQS=T|-nu|I-null-dscatalog-df-pf—nuII-wwe
LM3525A - productllm3525a?HQS=TI-nulI—nu|I—dscatalog-df-pf-nulI-wwe
LM3525AJ - product/Im3525aj?HQS=T|-nu|I-nulI-dscatalog-df—pf—nuII-wwe
LM3525AN - product/lm3525an?HQS=T|-nu|I-null-dscataIog-df-pf-null-wwe
LM3527A - product/Im3527a?HQS=T|-nulI-nuIl-dscatalog-df-pf-nulI-wwe
LM3527AJ - product/Im3527aj?HQS=T|-nu|I-nulI-dscatalog-df-pf-nulI-wwe
LM3527AN - product/lm3527an?HQS=T|—null-nu|I-dscataIog-df-pf-null-wwe
LM3525AJ - product/lm3525aj?HQS=T|-nu|I-null-dscatalog-df—pf—nuII-wwe
LM3525A - product/Im3525a?HQS=T|-nulI-nuIl-dscatalog-df-pf-nulI-wwe
LM1527AJ - product/Im1527a]?HQS=T|-nu|I-nulI-dscatalog-df-pf-nulI-wwe
LM1527AJ - product/Im1527aj?HQS=T|-nu|I-nulI-dscatalog-df-pf-nuII-wwe
LM1527A - product/Im1527a?HQS=T|-nulI-nu|I-dscatalog-df-pf-nulI-wwe
LM1525AJ - product/Im1525a]?HQS=TI-nu|I-nulI-dscatalog-df-pf-nulI-wwe
LM1525A - productllm1525a?HQS=TI-nulI—nu|I—dscatalog-df-pf-nulI-wwe
LM1527A - product/Im1527a?HQS=TI-nulI—nuII—dscatalog-df—pf—nuII-wwe
LM1525AJ - product/lm1525a]?HQS=T|-nu|I-null-dscataIog-df-pf-null-wwe
LM1525A - product/Im1525a?HQS=TI-nulI—nu|I—dscatalog-df-pf-nulI-wwe
LM3525AN - product/lm35253n?HQS=T|—null-nu|I-dscataIog-df—pf—nuII-wwe
LM3527AN - product/lm3527an?HQS=T|—nu||—nu|I-dscatalog-df—pf—nuII-wwe
LM3527AJ - product/lm3527aj?HQS=T|-nu|I-null-dscataIog-df-pf-null-wwe
LM3525AN - product/Im3525an?HQS=TI-nu|I-null-dscataIog-df-pf-null-wwe
LM3527A - product/Im3527a?HQS=TI-nulI—nuIl-dscatalog-df-pf-nulI-wwe
LM3527A - product/Im3527a?HQS=TI—nulI—nuII—dscatalog-df—pf—nuII-wwe
LM3527AJ - product/lm3527aj?HQS=TI-nu|I-nulI-dscatalog-df-pf-nulI-wwe
LM3527AN - product/Im3527an?HQS=TI-nu|I-null-dscataIog-df-pf-null-wwe
