LINEAR TECHNOLOGY LTC3704 Specifications and User Guide
Summary
The LTC3704 is a high-efficiency positive-to-negative DC/DC controller designed for power applications ranging from low-power battery systems to high-capacity telecom equipment. It features an ultra-wide input voltage range (2.5V to 36V) and eliminates the need for a current sense resistor, maximizing efficiency with its integrated Power MOSFET. This manual provides detailed specifications and application guidance on utilizing programmable switching frequencies and advanced low-power modes, making it ideal for portable electronic devices and demanding power supplies.
Page 1 Text Content
LTC3704 TM
Wide Input Range, No RSENSE
Positive-to-Negative DC/DC Controller
FEATURES DESCRIPTIO High Efficiency Operation (No Sense The LTC®3704 is a wide input range, current mode, Resistor Required) positive-to-negative DC/DC controller that drives an Wide Input Voltage Range: 2.5V to 36V N-channel power MOSFET and requires very few external Current Mode Control Provides Excellent Transient components. Intended for low to high power applications, Response it eliminates the need for a current sense resistor by
High Maximum Duty Cycle (Typ 92%) utilizing the power MOSFET’s on-resistance, thereby maxi- ±1% Internal Voltage Reference mizing efficiency.
±2% RUN Pin Threshold with 100m V Hysteresis
The IC’s operating frequency can be set with an external
Micropower Shutdown: IQ = 10µA
resistor over a 50k Hz to 1MHz range, and can be synchro-
Programmable Switching Frequency
nized to an external clock using the MODE/SYNC pin.
(50k Hz to 1MHz) with One External Resistor
Burst Mode operation at light loads, a low minimum
Synchronizable to an External Clock Up to 1.3 × f OSC
operating supply voltage of 2.5V and a low shutdown
User-Controlled Pulse Skip or Burst Mode® Operation
quiescent current of 10µA make the LTC3704 ideally
Internal 5.2V Low Dropout Voltage Regulator
suited for battery-operated systems.
Capable of Operating with a Sense Resistor for High
Output Voltage Applications (VDS >36V) For applications requiring constant frequency operation, Small 10-Lead MSOP Package the Burst Mode operation feature can be defeated using
EF FI CI EN CY
the MODE/SYNC pin. Higher than 36V switch voltage APPLICATIO S applications are possible with the LTC3704 by connecting the SENSE pin to a resistor in the source of the power
SLIC Power Supplies
MOSFET.
Telecom Power Supplies
Portable Electronic Equipment The LTC3704 is available in the 10-lead MSOP package. , LTC, LT and LTM are registered trademarks of Linear Technology Corporation. Burst
Cable and DSL Modems
Mode is a registered trademark of Linear Technology Corporation. No RSENSE is a Router Supplies registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5847554, 5731694.
TYPICAL APPLICATIO
VIN 5V to 15V
Conversion Efficiency
L1* VOUT
–5.0V 3A to 5A
RUN SENSE
CDC VIN = 5V
ITH VIN
LTC3704 VIN = 15V
RC NFB INTVCC COUT 3k 100µF
FREQ GATE M1 (X2)
VIN = 10V
MODE/SYNC GND D1
CC1 4.7n F RT
CVCC CIN
RFB1 RFB2
3704 TA01
OUTPUT CURRENT (A)
CIN, CDC : TDK C5750X5R1C476M D1: MBRD835L (ON SEMICONDUCTOR) 3704 TA01b COUT: TDK C5750X5R0J107M L1, L2: BH ELECTRONICS BH510-1009 CVCC: TAIYO YUDEN LMK316BJ475ML M1: Si4884 (SILICONIX/VISHAY)
Figure 1. High Efficiency Positive to Negative Supply
3704fa
Page Summary Contents For LINEAR TECHNOLOGY LTC3704 Specifications and User Guide
Manual Details
| Brand | Linear |
|---|---|
| Pages | 28 |
| File Size | 303.33 KB |
| Published | June 18, 2026 |
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Frequently Asked Questions
What overall input voltage range does the LTC3704 support?
It features a wide input voltage range, capable of operating from 2.5V up to 36V.
Do I need an external current sense resistor for this controller?
No, it eliminates the need for a current sense resistor by utilizing the power MOSFET’s on-resistance.
How can I adjust or synchronize the switching frequency?
The operating frequency is programmable (50kHz to 1MHz) and can be synchronized using the MODE/SYNC pin with an external clock.
What is the quiescent current when the unit is in shutdown mode?
In micropower shutdown, the quiescent current is only 10µA, which is suitable for battery-operated systems.