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SC631ULTRT

P1-P3P4-P6P7-P9P10-P12P13-P14
POWER MANAGEMENT
1
SC631
Fixed 4.4V Output
Charge Pump Regulator
© 2008 Semtech Corporation
Features
Input voltage range — 2.9V to 5.5V
V
OUT
tolerance — 4.4V ±3%
Continuous output current — 250mA
Peak output current — 500mA
Three charge pump modes: 1x, 1.5x and 2x
Output ripple ≤ 30mV
PP
for I
OUT
≤ 400mA
Short circuit, over-voltage, and over-temperature
protection
Soft-start functionality
Shutdown current — 0.1µA, typical
Ultra thin package — 2 x 2 x 0.6 (mm)
Fully WEEE and RoHS compliant
Applications
Mobile phones
Multi-LED backlit LCDs
PMPs
Digital video cameras
Digital still cameras
PDAs
LED camera  ash
Audio ampli er power
Description
The SC631 is a high-current voltage regulator using
Semtech’s proprietary low-noise charge pump technol-
ogy. Performance is optimized for use in single Li-Ion
battery cell applications. The regulator provides the per-
formance of a linear, low drop-out (LDO) voltage regulator
when the input is greater than 4.4V. Unlike an LDO, drop-
out is avoided when the input is less than 4.4V. Instead, a
charge pump is activated to provide voltage boost and
the head-room needed for voltage regulation.
Only two 2.2
µF bucket capacitors are required to deliver
the full output current. The charge pump provides a low
EMI solution compared to inductive boost regulators.
The SC631’s charge pump has three modes of operation:
2x, 1.5x, and 1x modes. The 2x and 1.5x modes deliver
current to the load in each of two phases. The 1x mode
turns o the charge pump, delivering current through an
LDO. When active, the charge pump provides low-ripple
operation at 200kHz, which is typically less than 30mVpp
at the output. The SC631 is capable of delivering 250mA
continuous current, with peak current to 500mA. A 22
µF
output capacitor is used for decoupling the load and for
smoothing mode transitions. Hysteresis is provided to
prevent chatter between charge pump modes.
The micro lead-frame package is both small and thermally
e cient, measuring 2 x 2 x 0.6 (mm).
SC631
V
BAT
V
OUT
= 4.4V @ 250mA
OUT
C1+
IN
GND
EN
C1-
C2+
C2-
C
IN
22μF
C
OUT
22μF
C
1
2.2μF
C
2
2.2μF
Chip
enable
Typical Application Circuit
July 24, 2008
Patents Pending
SC631
2
Pin Con guration
Marking Information
Ordering Information
Device Package
SC631ULTRT
(1)(2)
MLPD-UT-8 2x2
SC631EVB Evaluation Board
Notes:
(1) Available in tape and reel only. A reel contains 3,000 devices.
(2) Lead-free package only. Device is WEEE and RoHS compliant.
TOP VIEW
T
1
2
4
5
63
7
8
C2+
C2-
OUT
EN
GND
C1+
C1-
IN
631
yw
MLPD-UT-8; 2x2, 8 LEAD
θ
JA
= 68°C/W
yw = Datecode
SC631
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) 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.
(2) Tested according to JEDEC standard JESD22-A114-B.
Absolute Maximum Ratings
IN (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0
OUT (V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +6.0
C1+, C2+ (V) . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to (V
OUT
+ 0.3)
Pin Voltage — All Other Pins (V) . . . . . . . . . -0.3 to (V
IN
+ 0.3)
OUT pin — Short Circuit Duration . . . . . . . . . . Continuous
ESD Protection Level
(2)
(kV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Recommended Operating Conditions
Ambient Temperature Range (°C) . . . . . . . . -40 ≤ T
A
≤ +85
IN (V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.9 ≤ V
IN
≤ 5.5
Thermal Information
Thermal Resistance, Junction to Ambient
(1)
(°C/W) . . . .
68
Maximum Junction Temperature (°C) . . . . . . . . . . . . . . +150
Storage Temperature Range (°C) . . . . . . . . . . . . -65 to +150
Peak IR Reflow Temperature (10s to 30s) (°C) . . . . . . . +260
Unless otherwise speci ed: T
A
= +25°C for Typ, -40°C to +85°C for Min and Max; C
1
= C
2
= 2.2µF (ESR < 0.03Ω); C
IN
= C
OUT
= 22µF; V
IN
= 2.9V to 5.5V
Parameter Symbol Condition Min Typ Max Units
Output Voltage V
OUT
V
IN
= 4.2V, I
OUT
= 1mA 4.27 4.4 4.53 V
Output Voltage Ripple V
PP
I
OUT
≤ 400mA 30 mV
Maximum Output Current I
OUT
Peak Load - thermally limited
(1)
,
T
J
<150°C, 3.33V ≤ V
IN
≤ 5.5V
500 mA
Continuous Load, T
A
≤ 55°C, 2.92V ≤ V
IN
≤ 4.2V 325 mA
Continuous Load 250 mA
Shutdown Current I
SD
Shutdown (EN = GND), V
IN
= 3.6V 0.1 2 µA
Total Quiescent Current I
Q
EN high, I
OUT
= 1mA 1.5 2.5 mA
Charge Pump Frequency f
PUMP
V
IN
= 3.2V 200 kHz
Start-Up Time t
SU
(EN transitions from low to high),
4.27V ≤ V
OUT
≤ 4.53V, No load
400 µs
Line Regulation V
LINE
I
OUT
= 1mA, 2.85V ≤ V
IN
≤ 4.2V 21 mV
Load Regulation V
LOAD
V
IN
=4.2V, 1mA ≤ I
OUT
≤ 400mA 33 mV
Electrical Characteristics
P1-P3P4-P6P7-P9P10-P12P13-P14

SC631ULTRT

Mfr. #:
Buy SC631ULTRT
Manufacturer:
Semtech
Description:
Switching Voltage Regulators 3.6V CHARGE PUMP REG
Lifecycle:
New from this manufacturer.
Delivery:
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