sc120skevb Semtech Corporation, sc120skevb Datasheet

no-image

sc120skevb

Manufacturer Part Number
sc120skevb
Description
Low Voltage Synchronous Boost Regulator
Manufacturer
Semtech Corporation
Datasheet
POWER MANAGEMENT
Features
Applications
Typical Application Circuit
October 23, 2009
Input voltage — 0.7V to 4.5V
Minimum start-up voltage — 0.85V
Output voltage — fi xed at 3.3V; adjustable from 1.8V
to 5.0V
Peak input current limit — 1.2A
Output current at 3.3 V
190mA with V
Effi ciency up to 94%
Internal synchronous rectifi er
Switching frequency — 1.2MHz
Automatic power save
Anti-ringing circuit
Operating supply current (measured at OUT) — 50μA
Shutdown current — 0.1μA (typ)
No forward conduction path during shutdown
Available in ultra-thin 1.5 × 2.0 × 0.6 (mm)
MLPD-UT-6 and SOT23-6 packages
Lead-free, Halogen-free, and RoHS/WEEE compliant
MP3 players
Smart Phones and cellular phones
Palmtop computers and handheld Instruments
PCMCIA cards
Memory cards
Digital cordless phones
Personal medical products
Wireless VoIP phones
Small motors
Single
(1.2V)
IN
Cell
= 1.5V
OUT
— 80mA with V
C
IN
IN
© 2009 Semtech Corporation
= 1.0V,
IN
EN
GND
SC120
L1
Description
The SC120 is a high efficiency, low noise, synchronous
step-up DC-DC converter that provides boosted voltage
levels in low-voltage handheld applications. The wide
input voltage range allows use in systems with single
NiMH or alkaline battery cells as well as in systems with
higher voltage battery supplies. It features an internal
1.2A switch and synchronous rectifi er to achieve up to
94% effi ciency and to eliminate the need for an external
Schottky diode. The output voltage can be set to 3.3V
with internal feedback, or to any voltage within the speci-
fi ed range using a standard resistor divider.
The SC120 operates in Pulse Width Modulation (PWM)
mode for moderate to high loads and Power Save Mode
(PSAVE) for improved effi ciency under light load condi-
tions. It features anti-ringing circuitry for reduced EMI in
noise sensitive applications. Output disconnect capability
is included to reduce leakage current, improve effi ciency,
and eliminate external components sometimes needed to
disconnect the load from the supply during shutdown.
Low quiescent current is maintained with a high 1.2MHz
operating frequency. Small external components and the
space saving MLPD-UT-6, 1.5×2.0×0.6 (mm) package, or
low cost SOT23-6 package, make this device an excellent
choice for small handheld applications that require the
longest possible battery life.
OUT
FB
LX
Low Voltage Synchronous
C
OUT
Boost Regulator
3.3V
SC120
1

Related parts for sc120skevb

sc120skevb Summary of contents

Page 1

... MLPD-UT-6, 1.5×2.0×0.6 (mm) package, or low cost SOT23-6 package, make this device an excellent choice for small handheld applications that require the longest possible battery life OUT FB GND C IN SC120 © 2009 Semtech Corporation SC120 Low Voltage Synchronous Boost Regulator 3.3V C OUT 1 ...

Page 2

... SOT23, 6 LEAD yyww = date code Ordering Information Device OUT SC120ULTRT 4 SC120SKTRT SC120EVB SC120SKEVB Notes: (1) Available in tape and reel only. A reel contains 3,000 devices. (2) Lead-free packaging, only. Device is WEEE and RoHS compliant, and halogen-free. 3 Pin Confi guration — MLPD-UT LX GND Marking Information — MLPD-UT ...

Page 3

Absolute Maximum Ratings IN, OUT, LX -0.3 to +6 ...

Page 4

Electrical Characteristics (continued) Parameter P-Channel ON Resistance N-Channel ON Resistance N-Channel Current Limit P-Channel Startup Current Limit LX Leakage Current PMOS LX Leakage Current NMOS Logic Input High Logic Input Low Logic Input Current High Logic Input Current Low NOTES: ...

Page 5

Typical Characteristics — V Effi ciency vs. I OUT = 499k Ω Ω 4.7 μ 100 0.8V ...

Page 6

Typical Characteristics — V Temperature Reg. — PSAVE Mode (V = 499k Ω Ω 4.7 μ 5mA 1 2 OUT 1. 1. 0.8V ...

Page 7

Typical Characteristics — V Effi ciency vs. I OUT ο FB grounded 4.7 μ 100 ...

Page 8

Typical Characteristics — V Temperature Reg. — PSAVE Mode (V FB grounded 4.7 μ 5mA OUT 3 3. 1.0V 3.32 IN 3.28 3.24 3.2 -50 - Junction ...

Page 9

Typical Characteristics — V Effi ciency vs. I OUT = 931k Ω 402k Ω 4.7 μ 100 1.2V IN ...

Page 10

Typical Characteristics — V Temperature Reg. — PSAVE Mode (V = 931k Ω 402k Ω 4.7 μ 4 3. ...

Page 11

Typical Characteristics — V Effi ciency vs. I OUT = 931k Ω 294k Ω 3.3 μ 100 1. 0.8V IN ...

Page 12

Typical Characteristics — V Temperature Reg. — PSAVE Mode (V = 931k Ω 294k Ω 3.3 μ 5 1. 0. ...

Page 13

Typical Characteristics — V Effi ciency vs. I OUT = 931k Ω 294k Ω 4.7 μ 100 1.6V IN ...

Page 14

Typical Characteristics — V Temperature Reg. — PSAVE Mode (V = 931k Ω 294k Ω 4.7 μ 5 1. ...

Page 15

Typical Characteristics — V Effi ciency vs. I OUT = 931k Ω 294k Ω 6.8 μ 100 ...

Page 16

Typical Characteristics — V Temperature Reg. — PSAVE Mode (V = 931k Ω 294k Ω 6.8 μ 5 4. ...

Page 17

Typical Characteristics (continued) Load Transient (PSAVE to PWM 3.3V 1.2V 25°C OUT 5mA to OUT 100mA (50mA/div) V OUT (100mV/div) AC Coupled Time = (100μs/div) PSAVE Operation V = 3.3V, ...

Page 18

Pin Descriptions MLPD Pin # SOT23 Pin # Pin Name Thermal T NA Pin Function LX Switching node — connect an inductor from the input supply to this ...

Page 19

Block Diagram IN EN Oscillator and Slope Generator Output Voltage FB Selection Logic V OUT Comp Start-up Oscillator Slope Comp. PWM Comp. + PWM Control - Error Amp REF + - 1.2 V ...

Page 20

Applications Information Detailed Description The SC120 is a synchronous step-up Pulse Width Modulated (PWM) DC-DC converter utilizing a 1.2MHz fi xed frequency current mode architecture designed to provide output voltages in the range 1.8V to 5.0V from an ...

Page 21

Applications Information (continued) PWM Operation The PWM cycle runs xed frequency (f with a variable duty cycle (D). PWM operation continually draws current from the input supply (except for discon- tinuous mode, described subsequently). During the on- ...

Page 22

Applications Information (continued) BURST +1.8% +0.8% V OUT Prog’d Voltage -2% Inductor Current 240mA 0A Figure 2 — PSAVE Operation With Exit to PWM Due To Output Voltage Decay BURST +1.8% +0.8% V OUT Prog’d Voltage -2% Inductor Current 240mA ...

Page 23

Applications Information (continued) accumulates with each successive cycle in the burst. The result is that the output load current that can be sup- ported in PSAVE under this high V greater than occurs if the 240mA current limit can be ...

Page 24

Applications Information (continued) pause at a reduced output voltage until the load is reduced further. Output Overload and Recovery When in PSAVE operation, an increasing load will eventu- ally satisfy one of the PSAVE exit criteria and regulation will revert ...

Page 25

Applications Information (continued) ΔI is the inductor (and thus the input) peak-to-peak L current. Neglecting the n-channel FET R inductor DCR, for duty cycle D, and with ...

Page 26

Applications Information (continued 4.7μH should perform well for most applications. For high V , (4.0V to 5.0V), and relatively high V OUT above 6.8μH, along with a larger output capacitance or larger-package output capacitor (for better ...

Page 27

Applications Information (continued 7.0mm C LX SC120 GND Figure 4 — Layout Drawing for MLP package 8mm SC120 GND LX C Figure 5 — Layout Drawing ...

Page 28

Outline Drawing — MLPD-UT-6 1.5x2 A PIN 1 INDICATOR (LASER MARK) A aaa LxN N NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS TERMINALS. B ...

Page 29

Land Pattern — MLPD-UT-6 1.5x2 NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ...

Page 30

Outline Drawing — SOT23 E ccc C 2X N/2 TIPS B D aaa C SEATING PLANE C SIDE VIEW NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS -A- AND -B- TO ...

Page 31

... CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. Contact Information DIM INCHES Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805) 498-2111 Fax: (805) 498-3804 www.semtech.com DIMENSIONS MILLIMETERS (.098) (2.50) .055 1.40 .037 0.95 ...

Related keywords