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Part: EL7536IY-T7
Category:
Power Management
-> Regulators
Description: Very High Efficiency 1A Buck, PWM <<<>>> <<<>>>The EL7536 is a Synchronous, Integrated Fet 1A Step-down Regulator With Internal Compensation. It Operates With an Input Voltage Range From 2.5V to 5.5V, Which Accommodates Supplies of 3.3V, 5V, or a Li-ion Battery Source. The Output CAN be Externally Set From 0.8V to Vin With a Resistive Divider.
Company: Intersil Corporation
Datasheet: Download EL7536IY-T7 datasheet File size : 485 kB
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Datasheet text preview:
®
EL7536
D a t a Sheet J an u ar y 12, 2004 FN7396.1
PRELIMINARY
Monolithic 1A Step-Down Regulator
The EL7536 is a synchronous, integrated FET 1A step-down regulator with internal compensation. It operates with an input voltage range from 2.5V to 5.5V, which accommodates supplies of 3.3V, 5V, or a Li-Ion battery source. The output can be externally set from 0.8V to VIN with a resistive divider. The EL7536 features PWM mode control. The operating frequency is typically 1.4MHz. Additional features include a 100ms Power-On-Reset output, <1µA shut-down current, short-circuit protection, and over-temperature protection. The EL7536 is available in the 10-pin MSOP and 10-pin DFN (3x3 mm) packages, making the the entire converter occupy less than 0.15in2 of PCB area with components on one side only. Both packages are specified for operation over the full -40°C to +85°C temperature range.
Features
· Less than 0.15in2 (0.97cm2) footprint for the complete 1A converter · Components on one side of PCB · Max height 1.1mm MSOP10 or 1mm DFN 10 package · 100ms Power-On-Reset output (POR) · Internally-compensated voltage mode controller · Up to 94% efficiency · <1µA shut-down current · Over-current and over-temperature protection
Applications
· PDA and pocket PC computers · Bar code readers · Cellular phones · Portable test equipment
Ordering Information
PART NUMBER EL7536I Y EL7536IY-T7 EL7536IY-T13 EL7536I L EL7536IL-T7 EL7536IL-T13 PACK AGE 10-Pin MSOP 10-Pin MSOP 10-Pin MSOP 10-Pin DFN 10-Pin DFN 10-Pin DFN TAPE & REEL PKG. DWG. # 7" 13" 7" 13" MDP0043 MDP0043 MDP0043 MDP0047 MDP0047 MDP0047
· Li-Ion battery powered devices · Small form factor (SFP) modules
Pinout and Typical Application Diagram
EL7536 TOP VIEW
1 SGND 2 PGND 3 LX 4 VIN 5 VDD
FB 1 0 VO 9 POR 8 EN 7 RS I 6 100k 100k
R1* 100k R2* 124k
C1 10µF VO (1.8V@1A) VIN (2.5V-6V)
L1 1.8µH
C2 10µF
POR EN RSI R6 100k
R3 100 C3 0.1µF
R4 R5
* VO = 0.8V * (1 + R2 / R1)
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2004. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc. All other trademarks mentioned are the property of their respective owners.
EL7536
Absolute Maximum Ratings (TA = 25°C)
VIN, VDD, POR to SGND . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6.5V LX to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (VIN + +0.3V) RSI, EN, VO, FB to SGND . . . . . . . . . . . . . . . -0.3V to (VIN + +0.3V) PGND to SGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +0.3V Peak Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2A Operating Ambient Temperature . . . . . . . . . . . . . . . .-40°C to +85°C Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +145°C
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: TJ = TC = TA
Electrical Specifications
PARAMETER DC CHARACTERISTICS VFB IFB VIN, VDD VIN,OFF VIN,ON IDD
VDD = VIN = VEN = 3.3V, C1 = C2 = 10µF, L = 1.8µH, VO = 1.8V, unless otherwise specified. CONDI TIONS MIN TYP MAX UNIT
DESCRIPT ION
Feedback Input Voltage Feedback Input Current Input Voltage Minimum Voltage for Shutdown Maximum Voltage for Startup Supply Current VIN falling VIN rising PWM, VIN = VDD = 5V EN = 0, VIN = VDD = 5V
790
800
810 250
mV nA V V V µA µA m m A °C °C
2.5 2 2.2 400 0.1 70 45 1.5 T rising T falling VEN, VRSI = 0V and 3.3V VDD = 3.3V VDD = 3.3V VFB rising VFB falling ISINK = 5mA 86 35 0.8 -1 145 130
5. 5 2. 2 2. 4 500 1 100 75
RDS(ON)-PMOS
PMOS FET Resistance
VDD = 5V, wafer test only VDD = 5V, wafer test only
RDS(ON)-NMOS NMOS FET Resistance ILMAX TOT,OFF TOT,ON IEN, IRSI VEN1, VRSI1 VEN2, VRSI2 VPOR Current Limit Over-temperature Threshold Over-temperature Hysteresis EN, RSI Current EN, RSI Rising Threshold EN, RSI Falling Threshold Minimum VFB for POR, WRT Targeted VFB Value POR Voltage Drop
1 2. 4
V V V
95
% %
VOLPOR
70
mV
AC CHARACTERISTICS FPWM tRSI tSS tPOR PWM Switching Frequency Minimum RSI Pulse Width Soft-start Time Power On Reset Delay Time 50 Guaranteed by design 1.25 1.4 25 650 100 150 1.5 5 50 MHz ns µs ms
2
EL7536 Pin Descriptions
PIN NUMBER 1 2 3 4 5 6 7 8 9 10 PIN NAME SGND PGND LX VIN VDD RSI EN POR VO FB Negative supply for the controller stage Negative supply for the power stage Inductor drive pin; high current digital output with average voltage equal to the regulator output voltage Positive supply for the power stage Power supply for the controller stage Resets POR timer Enable Power on reset open drain output Output voltage sense Voltage feedback input; connected to an external resistor divider between VO and SGND for variable output PIN FUNCTION
Block Diagram
V DD VO 10pF 124K FB 5M + PWM COMPENSATION + PWM COMPARATOR CONTROL LOGIC + C URRENT LIMIT
VIN
100K CLOCK 1.4MHz EN EN SOFTSTART R AM P GENERATOR
P-DRIVER LX 1.8µ 1.8V 1A
10µF
10µF N-DRIVER UNDERVO LTAG E LOCKOUT TEMPERATURE SENSE
2.5V3.5V
+
BAND GAP REFERENCE SGND
PGND 100K POR PG
POR RSI
3
EL7536 Performance Curves and Waveforms
All waveforms are taken at VIN=3.3V, VO=1.8V, IO=1A with component values shown on page 1 at room ambient temperature, unless otherwise noted.
100 95 90 EFFICIENCY (%) 85 80 75 70 65 60
VIN=5V VO=3.3V EFFICIENCY (%)
100 95 90 85 80 75 70 65 60
VIN=3.3V VO=2.5V
VO=1.8V VO=1.2V
VO=2.5V
V O=1V
VO=1.8V VO=1.2V
0
200
400
600
800
1000
0
200
400
600
800
1000
IO (mA)
IO (mA)
FIGURE 1. EFFICIENCY
FIGURE 2. EFFICIENCY
1.44 1.42 1.4
VIN=5V IO=1A
VIN=3.3V IO=1A VIN=5V IO=0A VO CHANGES
0.1% 0.0% -0.1% -0.2% -0.3% -0.4% -0.5% VIN=5V VIN=3.3V
FS (MHz)
VIN=3.3V IO=0A 1.38 1.36 1.34 1.32 -50
0
50 TA (°C)
100
150
0
0.2
0.4 IO (A)
0.6
0.8
1
FIGURE 3. FS vs JUNCTION TEMPERATURE
FIGURE 4. LOAD REGULATIONS
0.1% 0.0% -0.1% VO CHANGES -0.2% -0.3% -0.4% -0.5% -0.6% -0.7% -50 VIN=5V IO=1A 0 50 TJ (°C) 100 150 VIN=3.3V IO=1A IIN (mA) VIN=3.3V IO=0A VIN=5V IO=0A
12 10 8 6 4 2 0 2.5 3 3.5 VIN (V) 4 4.5 5
FIGURE 5. LOAD/LINE REGULATIONS vs JUNCTION TEMPERATURE
FIGURE 6. NO LOAD INPUT CURRENT
4
EL7536 Performance Curves and Waveforms
(Continued)
All waveforms are taken at VIN=3.3V, VO=1.8V, IO=1A with component values shown on page 1 at room ambient temperature, unless otherwise noted.
VIN (2V/d)
VIN (1V/d)
IIN (0.5A/d)
VO (2V/d) POR (2V/d)
VO (1V/d)
0.5ms/d
50ms/d
FIGURE 7. START-UP 1
FIGURE 8. START-UP 2
VIN (2V/d) VO (2V/d)
IO
0.75A 0.25A
RSI (2V/d) POR (2V/d)
VO
20mV/d
50ms/d
0.2ms/d
FIGURE 9. POR FUNCTION
FIGURE 10. TRANSIENT RESPONSE
VIN
100mV/d
iL
0.5A/d
VLX
2V/d
VO
10mV/d
1µs/d
FIGURE 11. STEADY-STATE
5
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