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Linear Technology Electronic Components Datasheet

LTC3822EDD-1 Datasheet

Synchronous Step-Down DC/DC Controller

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LTC3822-1
FEATURES
No RSENSETM, Low Input
Voltage, Synchronous
Step-Down DC/DC Controller
DESCRIPTION
Dual N-Channel MOSFET Synchronous Drive
No Current Sense Resistor Required
Optimized for 3.3VIN and Li-Ion Applications
Constant Frequency Current Mode Operation for
Excellent Line and Load Transient Response
±1% 0.6V Reference
Low Dropout Operation: 99% Duty Cycle
Phase-Lockable or Adjustable Frequency:
250kHz to 750kHz
Internal Soft-Start Circuitry
Tracking and Adjustable Soft-Start Input
Selectable Maximum Peak Current Sense Threshold
Selectable Burst Mode®/ Forced Continuous/Pulse
Skipping Mode at Light Load
Digital RUN Control Pin
Output Overvoltage Protection
Micropower Shutdown: IQ = 7.5µA
Tiny Thermally Enhanced 12-Pin (3mm × 3mm) DFN
or 16-Pin Narrow SSOP Packages
APPLICATIONS
Single Cell Li-Ion Powered Systems
3.3VIN Systems
, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology
Corporation. No RSENSE is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by Patents, including 5481178, 5929620, 6580258, 6304066, 5847554,
6611131, 6498466, 5705919.
The LTC®3822-1 is a synchronous step-down switching
regulator controller that drives external N-channel power
MOSFETs using few external components. The constant
frequency current mode architecture with MOSFET VDS
sensing eliminates the need for sense resistors and im-
proves efficiency.
Burst Mode operation provides high efficiency at light
loads. The 99% maximum duty cycle provides low dropout
operation, extending operating time in battery-powered
systems.
The operating frequency can be programmed up to 750kHz,
allowing the use of small surface mount inductors and ca-
pacitors. For noise sensitive applications, the LTC3822-1
can be synchronized to an external clock from 250kHz to
750kHz.
The LTC3822-1 is available in the tiny footprint thermally
enhanced 12-pin DFN package or 16-pin narrow SSOP
package.
LTC3822-1
LTC3822
Light Load
Operation
Continuous, Discontinuous Discontinuous Mode
or Burst Mode Operation
Package
DD12 (3mm × 3mm), GN16 DD10 (3mm × 3mm),
MS10E
Tracking/Soft-Start Yes
Internal Soft-Start Only
External Sync
Yes
No
PGOOD Pin
GN16 Only
No
TYPICAL APPLICATION
10.2k
1nF
IPRG
VIN
RUN
PLLLPF TG
LTC3822-1
ITH
SW
BOOST
SYNC/MODE
TRACK/SS
GND
BG
VFB
GND
59k 118k
0.47µH
0.1µF
VIN
47µF
3.3V
×2
47µF
×2
VOUT
1.8V
8A
38221 TA01
Efficiency/Power Loss vs Load Current
100
10
90
Burst Mode
80
EFFICIENCY
1
70
60
50
40
30
20
10
0
10
0.1
Burst Mode
POWER LOSS
0.01
VIN = 3.3V
VOUT = 1.8V
FIGURE 10 CIRCUIT 0.001
100
1000
10000
LOAD CURRENT (mA) 38221 TA01b
38221f
1


Linear Technology Electronic Components Datasheet

LTC3822EDD-1 Datasheet

Synchronous Step-Down DC/DC Controller

No Preview Available !

LTC3822-1
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage (VIN) ........................ –0.3V to 4.5V
BOOST Voltage .......................................... –0.3V to 10V
PLLLPF, RUN, IPRG, SYNC/MODE,
TRACK/SS Voltages .......................–0.3V to (VIN + 0.3V)
VFB, ITH Voltages ....................................... –0.3V to 2.4V
SW Voltage ............................................ –2V to VIN + 1V
Operating Temperature Range (Note 2) ... –40°C to 85°C
Storage Ambient Temperature Range
DD ..................................................... –65°C to 125°C
GN ..................................................... –65°C to 150°C
Junction Temperature (Note 3) ............................. 125°C
Lead Temperature (Soldering, 10 sec)
GN Only ............................................................ 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
PLLLPF 1
SYNC/MODE 2
TRACK/SS 3
VFB 4
ITH 5
RUN 6
12 SW
11 VIN
13
10 BOOST
9 TG
8 BG
7 IPRG
DD PACKAGE
12-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
ORDER PART NUMBER
DD PART MARKING
TOP VIEW
GND 1
PLLLPF 2
SYNC/MODE 3
PGOOD 4
TRACK/SS 5
VFB 6
ITH 7
RUN 8
16 SW
15 SENSE
14 VIN
13 BOOST
12 TG
11 BG
10 IPRG
9 GND
GN PACKAGE
16-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 110°C/W
ORDER PART NUMBER
GN PART MARKING
LTC3822EDD-1
LCMS
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LTC3822EGN-1
38221
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.3V unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Main Control Loops
VIN
Input DC Supply Current
Normal Operation
Sleep Mode
Shutdown
UVLO
Undervoltage Lockout Threshold
Shutdown Threshold Of RUN Pin
Operating Voltage Range
(Note 4)
RUN = 0
VIN = UVLO Threshold – 200mV
VIN Falling
VIN Rising
2.75
3.3
4.5
V
360
525
µA
105
150
µA
7.5
20
µA
10
20
1.95 2.25 2.55
V
2.15 2.45 2.75
V
0.7
1.1
1.4
V
Regulated Feedback Voltage
(Note 5)
0.594 0.6 0.606
V
Output Voltage Line Regulation
2.75V < VIN < 4.5V (Note 5)
0.025 0.1
%/V
38221f
2


Part Number LTC3822EDD-1
Description Synchronous Step-Down DC/DC Controller
Maker Linear Technology
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