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SC121ULTRT

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P23
© 2010 Semtech Corporation
POWER MANAGEMENT
1
SC121
Low Voltage Synchronous
Boost Regulator
Features
Input voltage — 0.7V to 4.5V
Minimum start-up voltage — 0.85V
Output voltage —  xed at 3.3V; adjustable from 1.8V
to 5.0V
Peak input current limit — 1.2A
Output current at 3.3 V
OUT
—
80mA with V
IN
= 1.0V,
190mA with V
IN
= 1.5V
Forced PWM operation at all loads
E ciency up to 94%
Internal synchronous recti er
No forward conduction path during shutdown
Switching frequency — 1.2MHz
Soft-start startup current limiting
Shutdown current — 0.1µA (typ)
Ultra-thin 1.5 × 2.0 × 0.6 (mm) MLPD-UT-6 package
Lead-free and halogen-free
WEEE and RoHS compliant
Applications
MP3 players
Smart phones and cellular phones
Palmtop computers and handheld instruments
PCMCIA cards and memory cards
Digital cordless phones
Personal medical products
Wireless VoIP phones
Small motors
Description
The SC121 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 recti er to achieve up to
94% e 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-
ed range using a standard resistor divider.
The SC121 operates exclusively in Pulse Width Modulation
(PWM) mode for low ripple and  xed-frequency switching.
Output disconnect capability is included to reduce leakage
current, improve e ciency, and eliminate external com-
ponents 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
make this device an excellent choice for small handheld
applications that require the longest possible battery life.
L1
C
IN
3.3V
Single
Cell
(1.2V)
IN
OUT
LX
EN
FB
SC121
C
OUT
GND
Typical Application Circuit
April 13, 2010
SC121
2
Ordering Information
Device Package
SC121ULTRT
(1)(2)
MLPD-UT-6 1.5×2
SC121EVB Evaluation Board
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.
Pin Con guration — MLPD-UT
TOP VIEW
T
IN
EN
GND
FB
OUT
LX
6
5
4
1
2
3
MLPD-UT; 1.5×2, 6 LEAD
θ
JA
= 84°C/W
MLPD-UT; 1.5×2, 6 LEAD
yw = date code
121
yw
Marking Information — MLPD-UT
SC121
3
Exceeding the above speci cations may result in permanent damage to the device or device malfunction. Operation outside of the parameters
speci ed in the Electrical Characteristics section is not recommended.
NOTES:
(1) Tested according to JEDEC standard JESD22-A114.
(2) Calculated from package in still air, mounted to 3 x 4.5 (in), 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards.
Absolute Maximum Ratings
IN, OUT, LX, FB (V) . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0
EN (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (V
IN
+ 0.3)
ESD Protection Level
(1)
(kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Recommended Operating Conditions
Ambient Temperature Range (°C) . . . . . . . . . . . . -40 to +85
V
IN
(V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.7 to 4.5
V
OUT
(V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8 to 5.0
Thermal Information
Thermal Res. MLPD, Junction-Ambient
(2)
(°C/W) . . . . . . .
84
Maximum Junction Temperature (°C) . . . . . . . . . . . . . . . 150
Storage Temperature Range (°C) . . . . . . . . . . . -65 to +150
Peak IR Re ow Temperature (10s to 30s) (°C) . . . . . . +260
Unless otherwise noted V
IN
= 2.5V, C
IN
= C
OUT
= 22µF, L
1
= 4.7µH, T
A
= -40 to +85°C. Typical values are at T
A
= 25°C.
Parameter Symbol Conditions Min Typ Max Units
Input Voltage Range V
IN
0.7 4.5 V
Minimum Startup Voltage V
IN-SU
I
OUT
< 1mA, T
A
= 0°C to 85°C 0.85 V
Shutdown Current I
SHDN
T
A
= 25°C, V
EN
= 0V 0.1 1 µA
Operating Supply Current
(1)
I
Q
I
OUT
= 0, V
EN
= V
IN
3.5 mA
Internal Oscillator Frequency f
OSC
1.2 MHz
Maximum Duty Cycle D
MAX
90 %
Minimum Duty Cycle D
MIN
20 %
Output Voltage V
OUT
V
FB
= 0V 3.3 V
Adjustable Output Voltage Range V
OUT_RNG
For V
IN
such that D
MIN
< D < D
MAX
1.8 5.0 V
Regulation Feedback Reference Volt-
age Accuracy (Internal or External
Programming)
V
Reg-Ref
-1.5 1.5 %
FB Pin Input Current I
FB
V
FB
= 1.2V 0.1 A
Startup Time t
SU
1ms
Electrical Characteristics
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P23

SC121ULTRT

Mfr. #:
Buy SC121ULTRT
Manufacturer:
Semtech
Description:
Switching Voltage Regulators LOW VOLTAGE BOOST CONVRTR_PWM
Lifecycle:
New from this manufacturer.
Delivery:
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